NOAA Technical Memorandum NMFS-AFSC-372

C. A. Lang, J. I. Richar, and R. J. Foy

The 2017 Eastern Bering Sea 

Continental Shelf and Northern 

Bering Sea Bottom Trawl Surveys: 

Results for Commercial Crab Species

U.S. DEPARTMENT OF COMMERCE

National Oceanic and Atmospheric Administration

National Marine Fisheries Service

Alaska Fisheries Science Center

March 2018

doi:10.7289/V5/TM-AFSC-372
NOAA Technical Memorandum NMFS

The National Marine Fisheries Service's Alaska Fisheries Science Center uses 

the NOAA Technical Memorandum series to issue informal scientific and 

technical publications when complete formal review and editorial processing 

are not appropriate or feasible. Documents within this series reflect sound 

professional work and may be referenced in the formal scientific and technical 

literature.

The NMFS-AFSC Technical Memorandum series of the Alaska Fisheries 

Science Center continues the NMFS-F/NWC series established in 1970 by the 

Northwest Fisheries Center. The NMFS-NWFSC series is currently used by 

the Northwest Fisheries Science Center.

This document should be cited as follows:

Lang, C. A., J. I. Richar, R. J. Foy. 2018. The 2017 eastern Bering Sea 

continental shelf and northern Bering Sea bottom trawl surveys: Results 

for commercial crab species. U.S. Dep. Commer., NOAA Tech. Memo. 

NMFS-AFSC-372, 233 p.

Document available: http://www.afsc.noaa.gov/Publications/AFSC-TM/NOAA-TM-AFSC-372.pdf

Reference in this document to trade names does not imply endorsement by 

the National Marine Fisheries Service, NOAA.
March 2018

NOAA Technical Memorandum NMFS-AFSC-372

C. A. Lang, J. I. Richar, and R. J. Foy

Kodiak Laboratory

Alaska Fisheries Science Center 

National Marine Fisheries Service

National Oceanic and Atmospheric Administration

301 Research Court

Kodiak, AK 99615

www.afsc.noaa.gov

U.S. DEPARTMENT OF COMMERCE

Wilbur L. Ross Jr., Secretary

National Oceanic and Atmospheric Administration

 RDML Timothy Gallaudet (ret.), Acting Under Secretary and Administrator

National Marine Fisheries Service

 Chris Oliver, Assistant Administrator for Fisheries 

doi:10.7289/V5/TM-AFSC-372

The 2017 Eastern Bering Sea 

Continental Shelf and Northern 

Bering Sea Bottom Trawl Surveys: 

Results for Commercial Crab Species
This document is available to the public through: 

National Technical Information Service 

U.S. Department of Commerce 

5285 Port Royal Road 

Springfield, VA 22161 

www.ntis.gov 
iii

ABSTRACT

The eastern Bering Sea bottom trawl survey has been conducted annually since 1975 by the 

Resource Assessment and Conservation Engineering Division of the Alaska Fisheries Science 

Center, National Marine Fisheries Service. The purpose of this survey is to collect data on the 

distribution and abundance of crab, groundfish, and other benthic resources in the eastern Bering 

Sea. These data are used to estimate population abundances for the management of commercially 

important species in the region. This document includes the time series of results from 1975 to 

the present. In 2017, 395 total stations (375 standard stations and 20 resampled stations in Bristol 

Bay) were sampled on the eastern Bering Sea shelf from 4 June to 15 August. In early June, 

colder bottom temperatures extended into Bristol Bay creating the need to resample 20 stations 

due to delaying effects of cold water temperature on red king crab reproductive cycle. There was 

an overall decrease in biomass and abundance in male red king and blue king crab and female 

red king crab. There was an overall increase in immature female blue king crab and a decrease in 

mature female biomass and abundance, with no mature female blue king crab being caught in the 

St. Matthew Island Section. There were overall increases in immature and legal male and 

immature and mature female biomass and abundance in Chionoecetes bairdi and C. opilio crab, 

and a decrease in mature male biomass and abundance in Chionoecetes bairdi and C. opilio crab.

In addition to the standard eastern Bering Sea survey, in 2017, following the conclusion of the 

standard survey, 145 stations were sampled in the northern Bering Sea region, encompassing the 

region south of Bering Strait and including Norton Sound. These stations were sampled between 

1 August and 2 September. We report the results of this survey separately from the eastern 

Bering Sea survey, within the northern Bering Sea section of this report. Blue king crabs 

occurred largely in the region north of St. Lawrence Isand, in greater densities than were 

observed for the St. Matthew and Pribilof stocks. Red king crab occurred primarily in Norton 

Sound, at densities roughly intermediate between those generally observed in the Bristol Bay and 

Pribilof Districts. Chionoecetes opilio dominated the catch, with the highest densities observed 

during the 2017 Bering Sea survey occurring to the south of St. Lawrence. Immature male and 

female opilio were predominate, although mature females were observed, primarily along the 

western edge of the survey grid, and in the north, near Bering Strait. Morphometrically mature 

(“large-clawed”) male C. opilio were scattered throughout the survey region, but most prevalent 

within catch near Bering Strait.

v

The biomass estimates, reported in metric tons (t) and pounds (lb) with 95% confidence intervals 

(± 1.96 SE) for legal-sized males of each commercial crab stock in the eastern Bering Sea, were 

as follows: 

Commercial crab species

2017 Legal or preferred-sized male biomass (±95% CI)

t* lb** 

Bristol Bay District red king crab 20,842 45,947,862

(Paralithodes camtschaticus) (7,703) (16,981,361)

Pribilof District red king crab 3,513 7,743,840

(4,500) (9,920,761)

Pribilof District blue king crab 223 490,565

(P. platypus) (250) (551,088)

St. Matthew Is. Section blue king crab 1,333 2,938,261

(1,482) (3,267,009)

Southern Tanner crab, east 166° W 15,675 34,556,372

(Chionoecetes bairdi) (5,221) (11,511,255)

Southern Tanner crab, east 166° W 12,470 27,492,696

≥ 4.9 inches (4,399) (9,699,125)

Southern Tanner crab, west 166° W 21,288 46,932,435

(7,339) (16,180,417)

Southern Tanner crab, west 166° W 12,553 27,675,164

≥ 4.9 inches (5,631) (12,414,277)

Snow crab, all districts 52,272 115,240,376

(Chionoecetes opilio) (13,399) (29,540,503)

Snow crab, all districts 20,740 45,723,926

≥ 4.0 inches (5,817) (12,825,046)

*Estimates for preferred size classes are those with sizes listed in the left column.

**Biomass estimates in pounds were derived by converting the raw length data to pounds using regressions in

Table 3 prior to calculating the area-swept estimates.

vii

CONTENTS

ABSTRACT ................................................................................................................................... iii

INTRODUCTION .......................................................................................................................... 1

Survey History and Purpose ........................................................................................................ 1

Eastern Bering Sea Crab Stock Assessment Process................................................................... 1

METHODS ..................................................................................................................................... 2

Survey Area and Sampling Logistics .......................................................................................... 2

Biological Data Collection .......................................................................................................... 3

Crab Biomass Estimates .............................................................................................................. 6 

Centers of Distribution ................................................................................................................ 7 

Recruitment ................................................................................................................................. 8 

RESULTS ....................................................................................................................................... 8

Survey Overview ......................................................................................................................... 8

Bristol Bay District Red King Crab ............................................................................................. 9

Pribilof District Red King Crab ................................................................................................. 12

Pribilof District Blue King Crab ................................................................................................ 13

St. Matthew Island Section, Northern District Blue King Crab ................................................ 14

Tanner Crab ............................................................................................................................... 15

Snow Crab ................................................................................................................................. 17

Chionoecetes spp. Hybrid .......................................................................................................... 19

Other Crab Stocks and Species of Interest ................................................................................ 20

Northern District Red King Crab ........................................................................................... 20

Northern District Blue King Crab .......................................................................................... 20
viii

Hair Crab ................................................................................................................................ 20 

Gold King Crab ...................................................................................................................... 21 

NORTHERN BERING SEA EXTENSION OF THE 2017 STANDARD SURVEY ................. 21

Northern Bering Sea Survey Overview and Data Collection .................................................... 21

Norton Sound Section, Northern Bering Sea Red King Crab ................................................... 21

Northern Bering Sea Blue King Crab ........................................................................................ 22

Northern Bering Sea Tanner Crab ............................................................................................. 23

Northern Bering Sea Snow Crab ............................................................................................... 23

Northern Bering Sea Snow Crab Male Maturity Analysis ..................................................... 23 

Northern Bering Sea Chionoecetes spp. Hybrid ........................................................................ 25

Northern Bering Sea Hair Crab ................................................................................................. 25

ACKNOWLEDGMENTS ............................................................................................................ 27

CITATIONS ................................................................................................................................. 29

APPENDIX A: Eastern Bering Sea Standard Survey Station Details ........................................ 184

APPENDIX B: Northern Bering Sea Survey Station Details ..................................................... 220
INTRODUCTION

Survey History and Purpose 

The eastern Bering Sea (EBS) bottom trawl survey has been conducted by scientists in the 

Resource Assessment and Conservation Engineering (RACE) Division of the Alaska Fisheries

Science Center (AFSC), National Marine Fisheries Service (NMFS), since the early 1970s. 

Beginning in 1975, surveys were conducted annually, and were expanded beyond Bristol Bay to 

include the majority of the Bering Sea continental shelf with the original purpose of assessing

potential resource impacts of offshore oil development (Pereyra et al. 1978). The annual

collection of data on the distribution and abundance of crab and groundfish resources provides 

fishery-independent estimates of population abundances and biological data for the management

of commercially important species in the EBS. The crab species that have historically been

assessed during the survey due to their commercial importance include: red king crab

(Paralithodes camtschaticus), blue king crab (P. platypus), southern Tanner crab (Chionoecetes

bairdi), snow crab (C. opilio), and hair crab (Erimacrus isenbeckii). The common name for C. 

bairdi changed from Tanner crab to southern Tanner crab in 2005 (McLaughlin et al. 2005), but 

it will still be referred to as Tanner crab in this document. 

Prior to 1988, the total number of stations varied and gradually increased until being 

standardized in 1988 (Fig. 1). Therefore, the pre-1988 estimates provided in this document for

stocks that extend northwest of the Pribilof Islands are biased, as the entire stocks were not

sampled. Since 1988, 376 standard stations have been included in the survey covering

approximately 140,350 square nautical mile (nmi2) area of the EBS, with station depths ranging 

from 20 to 200 m (Fig. 1). The annual EBS bottom trawl survey begins in the northeast section 

of Bristol Bay in early June, and between 4 and 6 stations are typically sampled each day from

each of two vessels (Fig. 2). The standard survey is completed in late July or early August at the 

western edge of the survey grid, northwest of St. Matthew Island. In some years (i.e., 1999, 

2000, 2006-2012, 2017) when the red king crab reproductive cycle is delayed due to colder water 

temperatures, a small portion of the inner Bristol Bay area is resampled after the conclusion of 

the standard survey (see Methods). Because station Z-04 (see Fig. 2) has a limited area within a

trawlable depth range, tows were often completed at the northeast corner of station Z-04 (AZ0504). We now exclude station Z-04 (AZ-0504) for crab population estimation. Consequently 

375 stations are used for analysis of crab data, rather than 376 as listed in technical reports prior 

to 2015. 

Eastern Bering Sea Crab Stock Assessment Process

Crabs included in the federal Bering Sea and Aleutian Islands (BSAI) King and Tanner Crab

Fisheries Management Plan are managed by the Alaska Department of Fish and Game 

(ADF&G), with federal oversight by NMFS (NPFMC 2011). The annual stock assessment and 

fishery evaluation (SAFE) report prepared by the North Pacific Fishery Management Council 

provides current biological, ecosystem, and economic data associated with these commercial

crab species. The NMFS determines the procedure for setting overfishing levels (OFL) and 

allowable biological catch (ABC), while ADF&G sets the annual total allowable catch (TAC) or 
2 

guideline harvest level (GHL) for each crab stock. Currently, the Council’s Crab Plan Team

(CPT) and the Scientific and Statistical Committee (SSC) review the assessment, biological, 

economic, and modeling data to recommend biological reference points associated with the 

status of crab stocks. Crab stock boundaries are defined by ADF&G management units for king 

crab and Tanner crab species (Fitch et al. 2012); however, the Pribilof Islands blue king crab 

stock boundary also includes a 180 nmi X 20 nmi (9 X 1 station) column on the east side of the 

management unit, which was added in 2013 to account for blue king crab survey and bycatch

data. Red king crab are split into Bristol Bay and Pribilof Islands stocks and blue king crab are 

split into Pribilof Islands and St. Matthew Island stocks for management purposes, while Tanner 

and snow crab fisheries are considered single stocks but are split into separate management 

fishery units defined by the ADF&G Board of Fisheries using 166°W and 173°W as the 

boundary for each east and west unit, respectively. 

This report summarizes the 2017 survey results for commercially important crab resources in the 

EBS. Note that area-swept estimates in this document are indices of abundance, and may not 

match the final modeled population estimates in the SAFE reports because the models include 

additional population dynamics information. The results of the 2017 standard EBS bottom trawl 

survey are presented for these crab stocks as defined by the management units. Details of the 

survey design and fishing gear specifications, in addition to the number and weights of the 

groundfish species sampled at each standard station during this survey, will be reported in a 

separate NOAA Technical Memorandum (e.g., Conner and Lauth 2017). 

METHODS

Survey Area and Sampling Logistics 

The 2017 standard survey was conducted onboard the chartered fishing vessels FV Alaska 

Knight and FV Vesteraalen, beginning 4 June in the northeast corner of Bristol Bay, moving 

westward, and finishing on 31 July. The vessels did not sample in close proximity to each other 

for much of the survey (Fig. 2) due to special projects being conducted on one vessel, and due to 

vessel mechanical breakdowns. The FV Vesteraalen also returned to Bristol Bay to resample 20 

stations between 10 August and 15 August. These stations were resampled due to the delaying 

effects of cold water temperatures on the red king crab reproductive cycle (see Results: Bristol 

Bay District Red King Crab). 

The survey stations are divided into multiple management units defined by ADF&G commercial 

registration areas and districts, and are further divided into strata with either standard or high 

station densities (Fig. 3). Standard-density strata have stations centered in 20 X 20 nmi (37.04 X 

37.04 km) cells, while high-density strata include additional stations at the corners of the 20 X 20 

nmi cells. To calculate the total area for each stock strata the area for each 20 X 20 nmi cell is 

assumed to be 401 nmi2

 due to the effects of a spherical projection of the flat grid surface in an 

area as large as the EBS. 

The king crab Registration Area T in Bristol Bay (south of 58 °39 ′N and east of 168 °W) is 

54,536 nmi2 and consists of 136 stations. The king crab Registration Area Q in the Bering Sea is 
3

divided into the Northern District (north of 58° 39′ N) and the Pribilof District (south of 58° 

39′ N and west of 168°W). The area for the St. Matthew Island Section of the Northern District 

is divided into two sampling strata: 1) a high-density 7,218 nmi2 stratum with 28 stations (one of 

which is not trawlable but is included in the total area surveyed), and 2) a standard-density 

11,629 nmi2 stratum with 29 stations, for a total of 56 stations within the St. Matthew Island 

Section. The area of the Pribilof District is divided into two sampling strata: 1) a high-density 

10,025 nmi2 stratum with 41 total stations, and 2) a standard-density 14,436 nmi2 stratum with 

36 stations, for a total of 77 stations within the stock area. For Pribilof District blue king crab, 

the eastern stock boundary is 20 miles east of the Pribilof District and includes nine additional 

stations, as indicated in the 2013 Pribilof Islands Blue King Crab Rebuilding Plan (NPFMC 

2014). High-density strata have more stations (standard, corner) per area than standard-density 

strata.

The fishing gear used in 2017 was identical to that of previous EBS annual bottom trawl surveys 

since 1982 with both vessels fishing a standard 83-112 Eastern otter trawl employing an 83 ft 

(25.3 m) headrope and a 112 ft (34.1 m) footrope (Lauth and Nichol 2013). The codend mesh 

size is 8.9 cm stretched and the liner is 3.2 cm. The trawl nets on each vessel were removed from 

service and replaced with new nets every 20-30 consecutive tows (~5 days) to mitigate potential 

impacts from changes in net configuration due to fishing. Each tow was approximately 0.5 h in 

duration and 1.5 nmi (2.8 km) in length, and was conducted at a speed of 3 knots (1.54 m sec-1) 

(see Results for details), in strict compliance with NMFS bottom trawl protocols established by 

the National Oceanic and Atmospheric Administration (Stauffer 2004).

Net mensuration equipment (Marport sensors) was used to monitor the net’s fishing performance 

during each tow. A bottom contact sensor was attached to the center of the footrope to measure 

bottom contact of the net at 1-second intervals. The net mensuration system also included an 

acoustic sensor attached to the headrope, and two sensors attached to the port and starboard 

dandylines to measure net height and width during trawling operations. Data on bottom contact 

of the footrope, and GPS data were combined to calculate distance fished. Fishing power was 

assumed to be equal between the two vessels.

Surface and bottom water temperatures along with temperature-depth profiles were collected at 

6-second intervals throughout the duration of each tow using a Sea-Bird SBE-39 

bathythermograph continuous data recorder (Sea-Bird Electronics Inc., Bellevue, WA) attached 

to the headrope of the net. The temperature measurement range of the SBE-39 is -5 to 35 ± 

0.002 °C with pressure sensors measuring to a maximum depth of 1,000 ± 1 m and are calibrated 

every year by Sea-Bird Electronics. Bottom depth was also derived from these data by adding the 

net height from the net mensuration system to the headrope depth recorded by the SBE-39.

Biological Data Collection

For each tow, all crab were removed from the catch, sorted by species and sex, and a total catch 

weight was obtained for each species. Tanner and snow crab hybrids are identified by a 

combination of characteristics including curve of the epistome margin, eye color, carapace 

shape, and space between or shape of the rostrum horns (Karinen and Hoopes 1971, Urban et al. 
4

2002). A random subsample of the total catch occurred when an exceptionally large number 

(approximately > 300) of a species was caught in a tow. Subsamples varied in size and 

composition depending on the particular tow. The subsample may have occurred at the level of 

the entire catch or at the level of a particular size and sex category once the catch was sorted. The 

total weights of the sampled crab and non-sampled crab were recorded and an expansion factor 

was calculated to determine the final number of each species in the catch. 

Individual crab carapaces were measured (± 0.1 mm) to provide a size-frequency distribution of 

each sample. Crab sizes are reported as carapace width (CW) excluding spines for Tanner and 

snow crab, and carapace length (CL) for hair crab and all king crabs (Donaldson and Byersdorfer 

2005). Since 2006, individual weights were measured for blue king crabs every year, red king 

crab and snow crab in odd years, and for Tanner crab in even years to add to the existing lengthweight data and to monitor temporal variability in length-weight regressions. For every haul in 

2017, length-weight data were collected on up to five snow and red king crab per each of the 

following categories: 1) male crab, 2) ovigerous crab, and 3) non-ovigerous female crab. 

Because of their relative rarity, weight data were collected for all intact blue king crabs 

encountered that met the sampling requirements (i.e., whole, live crab without regenerating 

limbs). Weights were collected from representative size ranges throughout the spatial distribution 

of each species. Collections were regionally stratified and tally sheets ensured all size ranges 

were equally sampled within each region.

In the absence of specific age data, shell condition classification by length and sex is necessary 

for apportioning stock abundance and biomass for determination of stock status, analytical stock 

assessment, and for establishing annual management controls. Shell condition class serves as a 

semi-quantitative index of molt status and time in shell post-molt. For all EBS crab stocks, and 

particularly those which exhibit a terminal molt at maturity (i.e., Chionoecetes spp.), shell 

condition is a requisite for setting overfishing limits and harvest quotas. Carapace shell condition 

was assessed for each crab sampled and assigned to one of six classes according to specific 

criteria (0 = premolt or molting, 1 = soft and pliable, 2 = new hardshell both firm and clean, 

3 = oldshell slightly worn, 4 = oldshell worn, 5 = very oldshell). 

Clutch assessment is used to estimate spawning stock biomass and overall reproductive health 

and to monitor demographic changes in the mating population. All female crab abdomens were 

evaluated to determine reproductive condition based on the color of the eggs (0 = no eggs, 2 = 

purple, 3 = brown, 4 = orange, 5 = purple-brown, 6 = pink), the condition of the eggs (0 = no 

eggs, 1 = uneyed, 2 = eyed, 3 = dead, 4 = empty egg cases), and the size of the egg clutch (0 = 

immature, 1 = mature female no eggs, 2 = trace to 1/8, 3 = 1/4, 4 = 1/2, 5 = 3/4, 6 = full). 

Beginning with the 2017 survey, an additional egg condition code, 5 = hatching, was employed 

to denote females that were sampled while in the process of hatching their clutch.

For mature females, egg clutch and egg condition codes were used to identify the stage in the 

molt-mate cycle, with the presence of eyed embryos, hatching eggs, empty egg cases, or absence 

of eggs (barren, hereafter) in morphologically mature females signifying an incomplete cycle,

while mature females brooding uneyed embryos indicated completion of the cycle. The ratio of 

females with eyed embryos, hatching eggs, empty egg cases, and/or old shell barren to uneyed 

embryos was derived as a measurement of the molt-mate cycle progression during the survey.
5

Understanding reproductive biology is critical for managing crab stocks in the Bering Sea. 

Spatiotemporal variability in reproductive potential including fecundity, sperm reserves, and 

reproductive condition likely influences fluctuations in population abundances. Yet, most stock 

assessment models use spawning stock biomass (i.e., number and average weight of mature 

animals), but not embryo production, which can lead to different perceptions of productivity 

(Trippel 1999, Swiney et al. 2012). In recent years, egg clutches for red king crabs in Bristol Bay 

and Chionoecetes spp. throughout the eastern Bering Sea were collected during the survey to 

support process studies to assess female reproductive potential. Red king crab and snow crab 

fecundity varies interannually and spatially likely due to demographic variability in crab age as 

measured by size and shell condition (Rugolo et al. 2005, Swiney et al. 2012). Starting in 2012, 

mature female red king crab samples were collected (even years only) throughout their 

distribution to monitor fecundity changes over time. Future analyses will consider the 

correlations of reproductive potential with demographic and environmental patterns. 

In addition, mature female Chionoecetes spp. with shell condition 1-3 were collected in 

collaboration with ADF&G (see Table 4).

Maturity in male Chionoecetes spp. can be defined by morphometric characteristics of the chela 

where morphometrically immature and mature crab are separated into two morphometric groups

based on the frequency distribution of the chela height (large claw or small claw) to carapace 

width ratio (Stevens et al. 1993, Tamone et al. 2007). To assess the difference between 

morphometric maturity and true functional maturity, additional special projects have been 

conducted in recent years. As standard sampling protocol, chela height and carapace width 

measurements were taken for male Tanner crabs during even years starting in 2008, while chela 

height and carapace width measurements for male snow crabs were taken in odd years starting in 

2009. In 2017, chela height and carapace width measurements (± 0.1 mm) were collected from 

all male Tanner crab caught at each station.

Bitter crab syndrome is caused by a parasitic dinoflagellate, Hematodinium sp., and is found in 

Tanner and snow crab throughout Alaska waters (Meyers et al. 1996). The mortality rate of 

parasitized crabs is believed to be high, and symptoms include lethargy, pink carapace 

pigmentation, and white opaque hemolymph (Meyers and Burton 2009a). Meats of parasitized 

crabs are harmless to humans but are bitter tasting, making the crabs unmarketable. The 

prevalence of bitter crab syndrome fluctuates temporally and spatially between Chionoecetes 

spp. in the eastern Bering Sea (Meyers et al. 1996), and may be affected by changes in 

environmental conditions (Morado et al. 2010). Black mat syndrome is caused by a parasitic 

fungus, Trichomaris invadens, and was prevalent in the 1970s and 1980s throughout Alaska 

waters, primarily infecting Tanner crab, but does not pose human health concerns if infected 

Tanner crab meat is consumed (Meyers and Burton 2009b). Infected crabs have a dense, hard, 

black, tar-like covering over parts of the exoskeleton, which invades internal tissue causing 

destruction of the host (Meyers and Burton 2009b). Infections can prevent molting, cause 

blindness if eyestalks are infected, or result in mortality depending on the severity of the 

infection. Infected sub-legal crabs may fail to reach legal size or sexual maturity due to mortality 

or inhibited growth/molting. All crab carapaces were scanned for evidence of bitter crab 

syndrome and black mat fungus to understand its temporal and spatial variability. In addition, 

Tanner and snow crab blood samples were collected in each of three index sites, which was 

comprised of 10 stations per index site (20 crabs were attempted to be sampled per station).
6

Samples were set aside for further testing by scientists in the Shellfish Assessment Program, 

Pathobiology group at the AFSC in Seattle, Washington.

Crab Biomass Estimates

Crab density (number nmi-2

) was estimated at each station for sublegal or legal males, as well as 

mature and immature males and females of each stock. Maturity and legal size classes were 

based on literature values and State of Alaska regulations (Table 1). The ADF&G definitions for

legal size classes (CW in inches) include spines (ADF&G 2017), while CW measurements 

reported in this document exclude spines (Table 1). The area-swept by the trawl (nmi2) was 

calculated as the product of the distance traveled while the net had bottom contact by the mean 

net width over the duration of the tow. Prior to 2009, data reported in this annual document used 

a fixed width of 15.2 m (0.008 nmi) in the area-swept calculation to maintain consistency with 

historical calculations of crab abundances. Since 2009, all population biomass estimates for the 

entire time series are calculated using the variable net width based on net mensuration data 

(Table 2). The effective width of the trawl typically ranges from 14.6 to 18.3 m when towing at a 

speed of 3 knots (Weinberg 2003; Fig. 4), and changes with the depth of the tow due to changes 

in scope of the trawl wire (Rose and Walters 1990). For 2017 and all historical data reported in 

this current document, crab densities were calculated using the mean net width recorded for the 

duration of each tow, and a mean net width-inverse scope regression relationship was calculated 

when net width values were not recorded during a tow (Rose and Walters 1990). From 1975 to 

1981, the net width estimates used for the area-swept calculations were derived from a single 

width estimate calculated each year for a particular type of trawl used during the annual survey. 

From 1982 to 1987, the net width used in the area-swept calculations was estimated using the 

inverse relationship between net scope and net width developed by Rose and Walters (1990). 

From 1988 to 2017, the net width was estimated using the net mensuration system described 

above, which measures the height and width of the net throughout the duration of the tow (Table 

2, Fig. 4). Distance traveled by the trawl was determined from ship GPS positions recorded at the 

beginning and end of each tow.

All reported historical data, and the current biomass estimates are calculated for the number of 

individual male and female crab at each 1 mm size category for each species, using the weightsize relationships developed by the AFSC’s Kodiak Laboratory (Table 3). The size-weight

relationships are described by the expression: 

W = a Lb ,

where W is the total weight in grams, L is either CL or CW in millimeters, a is the intercept in 

log scale and b is the slope. Parameters a and b for the size-weight relationships are estimated 

from a linear regression fitted to log-transformed size-weight data collected between 2000 and 

2009.

The weights calculated at each 1 mm size category are summed within the legal male, sublegal 

male, mature and immature size categories for each species and sex caught at a station. The crab 

biomass within a district or section stratum was estimated by averaging crab densities from all 
7

stations within the defined district or section stratum, and multiplying by the total area of the 

district or section stratum specific to that stock. Total biomass was calculated using a stratified 

design based on management units (standard density, high density, ADF&G-defined districts, or 

section stratum). Population biomass estimates were calculated in each stratum and then summed 

among strata. Variance of the total biomass estimate for each size class was calculated by 

summing the variance of each stratum. The 95% confidence intervals were calculated using the 

standard error of the total population multiplied by 1.96. All biomass estimates and confidence 

intervals (± 95%) reported in this document are reported in metric tons (t) except in the Abstract 

where both t and pounds (lb) are reported. Metric tons can be converted to lb by multiplying the 

biomass in t by 2,204.62 for comparison with ADF&G reported values of total allowable catch 

(TAC) and guideline harvest levels (GHL). 

In years with colder than average bottom water temperatures (1999, 2000, and 2006-2012), a 

small number of standard Bristol Bay stations sampled at the beginning of the survey were 

resampled in mid-August to accurately assess the percentage of ovigerous red king crab females 

which had extruded a new clutch of uneyed embryos. In 2017, it was necessary to resample 20 

Bristol Bay stations in late July due to the low number of newly molted, ovigerous female with 

clutches of uneyed embryos that were sampled in early June. These resample stations were 

selected based on the density of female red king crab at these stations during the first sampling 

event and from expected distributions based on previous Bristol Bay surveys. The 2017 total 

population estimates for male Bristol Bay red king crabs were calculated using only standard 

tows from leg 1 in June. Female Bristol Bay red king crab biomass estimates were calculated by 

replacing data collected at the original stations with data collected at the resample stations in July 

due to crab growth and movement into the sampling area during the time between the standard 

survey and the resampling event.

The population biomass estimates reported in this document are point estimates, and have 

substantial uncertainty due to the expanse of the area being sampled and the distributions of the 

resource. These point estimates are least precise for small crabs due to gear selectivity, and for 

females of some stocks due to crab behavior. For example, female blue king crab prefer rocky 

habitat, which is difficult to sample with bottom trawls. For consistent analyses, and due to a 

lack of available data, catchability is assumed to be near or equal to one for the indices 

developed in this document. The stock assessment models that incorporate these survey data 

consider catchability when estimating abundance and biomass.

Centers of Distribution

The centers of distribution for male and female crab from 1975 to 2017 were determined by 

averaging the latitude and longitude of each positive tow for a particular species. Latitude and 

longitude were weighted by the CPUE for each size and sex class. For years with retows both 

tows were included separately.
8

Recruitment

Population fluctuations are likely influenced by variations in recruitment strength. Thus, 

assessing temporal variability in abundances of new individuals reaching the minimum legal size 

is important to predict the following season’s catches. The term “recruitment” can refer to 

various life history stages including newly settled juveniles, individuals reaching sexual 

maturity, or individuals reaching the legal size limit. For the purposes of this technical 

memorandum, “pre-recruits” are defined as mature male crabs in the size class that will likely 

enter the fishery (minimum legal size limit) the following year, also referred to as “P1” crabs by 

some stock assessment authors (Table 1). A time series of pre-recruit abundance estimates are 

provided as an index for future abundances of legal crab. 

RESULTS 

Survey Overview 

The 2017 EBS bottom trawl survey consisted of 395 total bottom trawls (375 standard survey 

stations, and 20 resampled stations in Bristol Bay) conducted from 4 June to 15 August over an 

area of approximately 140,350 nmi2

, beginning in the southeast corner of Bristol Bay, moving 

east to west, and finally moving from the stations northwest of St. Matthew Island to the stations 

along the slope edge south to finish on 31 July. The latitude and longitude of the midpoint of 

each successful tow along with the duration (h), distance fished (km), bottom depth (m) and 

bottom temperatures (°C) are listed in the Appendix. The mean distance fished across all tows 

was 1.52 nmi (2.82 km, SD = 0.10 nmi) with a range of 0.72 to 1.85 nmi (1.34 to 3.44 km) and 

the mean tow duration was 30.9 minutes (SD = 1.85 min, range = 14.8 to 36.5 min) for both 

standard and retow stations. The fishing depth of the 83-112 Eastern otter trawl ranged from 19

to 193 m with a mean gear depth of 78.9 m (SD = 34.0 m) for standard survey stations. The 

fishing depth for the 20 retow stations ranged from 38 to 89 m with a mean gear depth of 60.4 m 

(SD = 12.1 m). The mean net width per tow ranged from 13.6 to 20.1 m and the average mean 

net width for all 375 standard successful tows was 17.0 m (SD = 1.0 m). The mean net width per 

tow for 20 retow stations ranged from 15.4 to 17.4 m and the average mean net width was 16.4 m 

(SD = 0.5 m). The 2017 net fishing performance (distance fished, tow duration, gear depth, net 

width) was consistent with previous years with the exception of 1975, when tow duration was 60 

minutes and mean distance fished was 2.26 ± 0.18 nmi.

The bottom temperature at each station during the standard survey ranged from -1.6 °C to 8.2 °C 

(Fig. 5a). A cold pool of water < 2°C extended onto the middle shelf between the 50 and 100 m 

isobaths and almost into the eastern edge of Bristol Bay with cold temperatures persisting 

northeast of the Pribilof Islands, which was extended relative to previous years. Warmer bottom 

temperatures were evident between the 100 and 200 m isobaths in the southern region of the 

survey area and in shallow waters north of Bristol Bay and around Nunivak Island. Cold water 

temperatures persisted in the northwestern area between the 50 and 200 m isobaths and the 

waters surrounding St. Matthew Island. In 2017, the average bottom water temperature during 

the first survey leg (4 June to 20 June) was 1.7 °C (SD = 2.0), which was colder than the average 

mean bottom water temperature during the same time period during the previous 4 years (Fig. 6).
9

The bottom water temperatures at the 20 stations resampled in August ranged from 1.9 to 7.8 °C, 

with a mean of 5.0 °C (SD = 1.5) (Fig. 5b).

Population abundance and biomass of the seven commercial crab stocks sampled during this 

survey fluctuated dramatically from 1975 to 2017 (Figs. 7-12). Overall commercial crab mature 

male biomass decreased from approximately 300,000 t to below 100,000 t in the mid-1980s, 

increased to just below 500,000 t in the early 1990s due to increases in snow and Tanner crab, 

leveled out around 200,000 t between 2005 and 2015, but dropped to approximately 100,000 t in 

2017 (Fig. 7).

Six special projects were conducted in addition to the standard assessment survey to collect 

specific biological data from particular crab species (Table 4). Five of the projects originated 

from the AFSC: 1) collect Tanner and snow crab blood samples at three index sites to monitor 

bitter crab syndrome, 2) collect female snow crabs to assess annual versus biennial reproductive 

cycles, 3) collect snow crab shell to identify variability in shell structure and calcification, 4) 

collect male Tanner crab chela height measurements for estimating maturity, and 5) collect 

mature female snow and Tanner crabs for laboratory larval and juvenile growth studies. One

project originated from ADF&G: collect snow crab for research of genetics mating dynamics.

Five-hundred and fourteen snow crab and 610 Tanner crab blood samples were collected from 

six index sites to monitor bitter crab syndrome. Approximately 600 snow crabs were collected 

for the annual versus biennial reproduction study. Over 750 snow crab claws were collected for 

the shell structure and calcification project. Chela heights were measured for maturity estimates; 

3,643 male Tanner crab and 3,328 male snow crab chela heights were measured in 2017. Fifteen

ovigerous female snow crabs and 15 ovigerous female Tanner crabs were collected for growth 

studies. Three-hundred and twenty-three mature female snow crab were also collected for a

genetics mating dynamics project. All collections were completed within the guidelines 

stipulated by the ADF&G collection permit for each project (CF-16-010(1), CF-17-076).

Bristol Bay District Red King Crab

Red king crab (Paralithodes camtschaticus) were caught at 72 of the 136 stations in the Bristol 

Bay management district in 2017. Similar to historical trends over the last 30 years, Bristol Bay 

red king crab were caught at an average depth of 55.5 m (SD = 13.8 m). The density of legalsized male crab caught at a station ranged from 62 to 2,355 crab nmi-2 (see Appendix). Legalsized male Bristol Bay red king crab were caught at 60 stations (Table 5; Fig 13b), resulting in a 

total biomass estimate (± 95% CI) of 20,842 ± 7,703 t (Table 6) and a total abundance estimate 

(± 95% CI) of 6.4 ± 2.4 million crab (Table 7) in the Bristol Bay District. The majority of mature 

males were concentrated in the central and southern section of Bristol Bay along the Alaska 

Peninsula (Figs. 13-15). The 2017 estimated biomass of legal-sized males is lower than last year, 

and lower than the 20-year average of 28,745 ± 4,466 t (Table 6). 

Red king crab mature males were encountered at 64 of the 136 surveyed stations with no one 

station dominating in abundance (Fig. 14a). One-hundred percent of the 266 mature males and 

112 immature males caught were measured (Table 5). The estimated biomass of 23,102 ± 8,328 t
10

for mature males is 91% of the total male biomass in 2017 with immature male red king crab 

estimated at 2,239 ± 780 t (Table 6). The majority of both size categories were located in the 

central and northern Bristol Bay District (Figs. 14 and 15).

In 2017, an overall decrease in male red king crabs was observed compared to last year (Fig. 16). 

Fifty-three percent of legal-sized males were new hardshell crabs and 47% were oldshell and 

very oldshell crabs with the majority of oldshell males caught in central Bristol Bay (Fig. 17a17c).

One objective of this multi-species bottom trawl survey is to assess the mature red king crab 

population when mature females are carrying newly extruded, uneyed embryos after completion 

of the molt-mate cycle (Otto 1986). Embryo development and larval hatching in female red king 

crab, followed by the molting and mating cycle, are delayed in years with cold bottom water 

temperatures (Chilton et al. 2010, Shirley et al. 1990, Stevens and Swiney 2007, Dew 2008). 

During years with colder than average bottom temperatures (1999, 2000, and 2006-2012, 2017),

the ratio of eyed to uneyed embryos encountered in mature females on the survey in June was 

higher compared to warmer years (2001-2005, 2013-2016) (Table 8). The eyed to uneyed 

embryo ratio ranged from 6.68 to 0.64 in cold years, compared to 0.06 to 0.00 in the warmer 

years. The ratio of eyed to uneyed embryos in mature females decreased dramatically when the 

Bristol Bay stations were resampled in cold years, ranging from 0.06 to < 0.01, and indicating 

that the majority of mature females completed the mating and molting cycle (Table 8).

The determination that the molting and mating cycle has been delayed is made when high 

numbers of oldshell mature females either brooding eyed embryos, which were fertilized from 

the previous season, or with pleopods exhibiting empty egg cases, are encountered during the 

first leg of the survey. To determine whether it is necessary to tow the Bristol Bay red king crab 

stations again, the reproductive condition of the mature female red king crab and the change in 

abundance of males and females between survey legs during cold years are assessed. 

Similar to the previous years (1999, 2000, and 2006-2012), the cold water temperatures in 2017 

delayed the molting and mating cycle in mature female red king crab and only 46% of the 471

mature females sampled during the standard survey had extruded a new clutch of uneyed 

embryos. Bottom temperatures significantly increased from June (3.18 °C) to the retow in 

August (5.01 °C) which was followed by a significant change in the eyed to uneyed ratio during 

the survey (Table 8). In early June, the oldshell females with empty egg cases and the new, 

hardshell females with uneyed embryos were distributed throughout Bristol Bay (Figs. 18a and 

20b). Among resurveyed female crab in early August, 89% were mature females and 100% of 

these were in new, hardshell condition with newly extruded uneyed embryos (Figs. 18b and 20c). 

These new, hardshell females had molted and mated over the 6-week period between the first 

sampling event in early June samples and the resample in early August. In 2017, the ratio of eyed 

to uneyed embryos decreased from 1.19 in early June during the standard survey to 0.00 in early 

August during the resampling event (Fig. 20a, Table 8). The average density of mature female 

red king crab caught at the 20 resample stations in early June was 1,286 crab nmi-2 compared to a 

total density of 1,824 crab nmi-2 at those same resample stations in early August (Figs. 13a-13d).

The 2017 biomass estimates for female red king crab were calculated by replacing data collected 

at the original stations in early June with data collected at the resample stations in early August.
11

The 2017 mature female red king crab biomass estimate of 26,424 ± 13,139 t (Table 6) and 

abundance estimate of 17.5 ± 8.6 million crabs (Table 7) is 88% of the total female abundance 

with immature female red king crab biomass estimated at 1,193 ± 680 t (Table 6). The majority 

of the mature female red king crab were caught in the central area of Bristol Bay and along the 

Alaska Peninsula (Figs. 14b and 18a).

Spatial distribution of red king crabs have fluctuated since the start of the survey. The centers of 

distribution for mature male and female red king crab shifted north and east of the southwest 

Bristol Bay region from 1980 to 1987 (Fig. 21). From 1988 to 1991, the mature female 

distribution slightly shifted south before returning to the northeastern distribution while males 

remained in the northeast. Loher and Armstrong (2005) hypothesized that the shift during the 

late 1970s and early 1980s was due to warmer bottom temperatures. Yet an alternative 

hypothesis suggests the disappearance of the southwestern portion of the population near the 

Unimak region during the late 1970s and early 1980s was caused by fishing effects (Dew and 

McConnaughey, 2005). In more recent years when the cold pool extended onto the Bristol Bay 

shelf area (from 2008 to 2012), the distribution of mature females and males moved from the 

central area of Bristol Bay to the nearshore areas along the Alaska Peninsula supporting the 

temperature hypothesis (Chilton et al. 2010). This may be because females avoid water cold 

enough to delay embryogenesis during brooding (Stone et al. 1992). The centers of distribution 

for mature males and females in 2017 was approximately 10 nmi north relative to 2016 centers 

of distribution and 20 nmi north relative to the previous 2 years (Fig. 21). 

The location of ovigerous females at larval release may impact post-larval settlement success and 

recruitment strength in subsequent years. Given the known current structure in Bristol Bay, 

larvae released from females located in southwestern Bristol Bay would have a higher likelihood 

of settling in inner Bristol Bay. A northward shift in adult spatial distribution may reduce larval 

supply along the Alaska Peninsula and in inner Bristol Bay which is likely more favorable for 

juvenile survival than elsewhere in Bristol Bay (McMurray et al. 1984, Zheng and Kruse 2006). 

If this hypothesis is correct, reduced settlement success in warm years relative to cold years 

(Evans et al. 2012) may explain population trends over the past several decades. Year-class 

strength was high during the 1970s and early 1980s, but has been generally low since 1985 

(Figs. 22 and 23). High abundances in the 1970s occurred when the spawning stock was located 

in southern Bristol Bay (Armstrong et al. 1993), while the low abundances starting in the mid1980s may be caused by the warmer bottom temperatures and potentially related adult spatial 

shift. Despite relatively cold years in 2008-2012 and an extended cold pool, estimated population 

abundance has been low in recent years. A strong juvenile size group (40 mm to 50 mm CL size 

category) was observed in 2011 and could be associated with the colder temperatures in 2008-

2012. The strong 2011 juvenile size class was not observed in 2012 or 2013, but relatively high 

abundances of females appeared in the 110-120 mm size class in 2014, which may be attributed 

to the strong juvenile size group seen in 2011 (Figs. 22 and 23). The 2017 mature male and prerecruit population abundance estimates were lower compared to 2016. Mature female estimates 

were lower in 2017 compared to 2016, and still below the 20-year average of 26.8 ± 3.4 million 

crabs.
12

Pribilof District Red King Crab

Historically, red king crab were not abundant in the Pribilof District and landings were taken 

incidentally during the blue king crab fishery. The red king crab fishery first opened in 1993 

while fishing for blue king crab was closed. A combined fishery for red and blue king crab 

occurred in the Pribilof District from 1995 through 1998, but due to low abundance of blue king 

crab, the combined fishery and the red king crab fishery have both remained closed since the 

1998-1999 season (Gish 2006).

Red king crab were caught at 9 of the 77 stations in the Pribilof District, most of which were in 

the high-density sampling area in 2017 (Fig. 24a). Pribilof District red king crab were caught at 

an average depth of 60.8 m (SD = 9.0 m), which is slightly deeper than the long-term average 

(56.0 m). The density of legal-sized males caught at a station ranged from 71 to 2,333 crab nmi-2

(Appendix). Legal-sized male red king crab were caught at 8 of the 77 stations in the Pribilof 

District (Table 5, Fig. 24b) with a biomass estimate (± 95% CI) of 3,513 ± 4,500 t (Table 9) and

an abundance estimate (± 95% CI) of 1.0 ± 1.2 million crab (Table 10). Legal-size males 

represented 47% of the total male estimated biomass and were below the average of 6,176 ± 

2,471 t from the previous 10 years (Table 9).

Mature males were encountered at 8 of the 77 stations in the Pribilof District, most of which 

were in the high-density sampling area (Fig. 25). All of the 57 mature and 6 immature males 

caught were measured (Table 5). Two stations accounted for 88% of all mature red king crab 

caught (Fig. 26). The biomass estimate of mature males was 3,658 ± 4,632 t and represented 

98% of the total male biomass (Table 9) with the remaining 2% represented by 88 ± 98 t of 

immature male red king crab (Table 5). Mature males were distributed around St. Paul Island in 

the nearshore shallow water stations and to the north, south, and east of St. Paul Island 

(Figs. 25 and 26).

The 2017 size-frequency for red king crab males shows considerably fewer newshell legal-sized 

males compared to 2016 (Fig. 27). In 2017, 58% of the legal-sized males were new hardshell 

crabs and primarily distributed around St. Paul Island. Forty-two percent of the legal-sized males 

were in oldshell and very oldshell condition and distributed around St. Paul Island (Fig. 28).

The 2017 biomass estimate of mature red king crab females was 505 ± 550 t and abundance was 

0.3 ± 0.3 million crab, representing 100% of the total female biomass collected during the survey 

(Tables 9 and 10). Female biomass estimates are imprecise due to the limited number of tows 

with positive crab catches (Appendix; Fig. 24a), and 2017 estimates indicate mature female 

biomass was at 38% of the average over the last 10 years (Fig. 11). One-hundred percent of the 

mature females were new hardshell between 111 and 166 mm CL and 78% of the mature females 

were carrying either 75% or 100% full clutches of uneyed embryos (Fig. 29).

The centers of distribution for both males and females have moved within a 40 nmi by 40 nmi 

region around St. Paul Island (Fig. 30). The center of the red king crab distribution moved to 

within 20 nmi of the northeast side of St. Paul Island as the population abundance increased in 

the 1980s and remained in that region until the 1990s. Since then, the centers of distribution have 
13

been located closer to St. Paul Island. Centers of distribution in 2017 were located toward the 

north east and were slightly closer to St. Paul Island compared to 2016.

Specific mechanisms for population fluctuations are unknown for Pribilof District red king crab.

However, it is generally acknowledged that climate change impacts marine ecosystems, 

including Bering Sea crab and fish species. A climatic regime shift took place in the North 

Pacific Ocean during the winter of 1976-77, which was characterized by an abrupt transition 

from a negative to positive Aleutian Low Pressure Index (ALPI) and Pacific Decadal Oscillation 

(PDO) resulting in warmer air and sea surface temperatures relative to pre-1977 conditions. After 

the 1977 regime shift, a slight increase in Pribilof District red king crab occurred followed by a 

larger increase in the 1990s (Figs. 31 and 32). Male and female Pribilof red king crabs decreased 

in 2017, with a decrease in male pre-recruits as well (Fig. 12). 

Pribilof District Blue King Crab (including total stock boundary)

Blue king crab (Paralithodes platypus) were caught at 7 of the 86 stations in the Pribilof stock 

boundary area; all in the high-density sampling area in 2017 (Fig. 33a). Pribilof District blue

king crab were caught at an average depth of 66.1 m (SD = 4.1 m), which has been similar over 

the last 30 years. The 2017 biomass estimate (± 95% CI) of legal-sized males was 223 ± 250 t 

(Table 11, Fig. 33b) and abundance was 0.1 ± 0.1 million crab (Table 12), representing 75% of 

the total male biomass and well below the average of 708 ± 361 t for the previous 20 years 

(Tables 11 and 12).

Blue king crab mature males were caught at 4 of the 86 stations in the Pribilof stock boundary 

area and all of the four mature males and four immature males caught were measured (Table 5; 

Fig. 34). The mature male biomass estimate of 253 ± 254 t represents 48% of the total male 

estimated biomass with 45 ± 68 t of immature male blue king crab estimated in the Pribilof stock 

boundary area (Tables 5 and 11). All male blue king crab were captured to the north and east of 

St. Paul Island (Figs. 34-35 and 37). In 2017, all of the legal-sized males were in oldshell and 

very oldshell condition and distributed around St. Paul Island (Figs. 36 and 37).

Ten mature female blue king crab were caught in the Pribilof stock boundary area high-density 

sampling area which extrapolated to a biomass estimate of 204 ± 237 t (Table 11) and an 

abundance estimate of 0.2 ± 0.3 million crab (Table 12), and represents 78% of the total female 

estimated biomass. Estimates of female biomass are imprecise due to their preference for rocky 

habitat which is difficult to sample with bottom trawls. Blue king crab females are 

predominantly biennial spawners with only a portion of the female population carrying eyed 

embryos in a given year, while the remainder are in a non-embryo-bearing phase (Somerton and 

Macintosh 1985). Nine of the 10 mature female blue king crab sampled in the Pribilof stock 

boundary area were brooding uneyed embryos and one mature had no eggs (Fig. 38). All of the 

females with embryos had 100% full clutches (Fig. 38).

The centers of distribution for both males and female blue king crab are located within a 40 nmi 

by 40 nmi region east of St. Paul Island (Fig. 39). The center of the blue king crab distribution 

moved to within 20 nmi of the northeast side of St. Paul Island as the population abundance 
14

decreased in the 1980s before moving easterly in the 1990s. In 2017, the mature male and female 

centers of distribution were located approximately 25 nmi east of St. Paul Island.

Pribilof blue king crab production was higher in the late 1970s and early 1980s, and increased in 

the 1990s with female abundances at an all-time high in 1980 (Figs. 40 and 41). A pulse of male 

and female blue king crabs in the 55-60 mm CL size class was seen in 2005, yet this cohort was 

not observed at elevated abundances in subsequent years. Overall male and female blue king 

crab abundances have been extremely low in recent years with no evidence of increasing.

St. Matthew Island Section, Northern District Blue King Crab

The blue king crab fishery in the St. Matthew Island Section of the Northern District opened in 

2009 after a 10-year rebuilding plan but was closed due to ADF&G harvest regulations in 2013. 

In 2017, blue king crab were caught at 13 of the 56 total stations in the St. Matthew Island 

Section sampling strata; all 13 stations were in the high density area (Table 5, Fig. 42a). St. 

Matthew Island blue king crab were caught at an average depth of 84.0 m (SD = 20.5 m), which 

is slightly deeper than the long-term average depth (72.5 m; SD=21.8 m). Twenty-seven legalsized male blue king crab were caught in 2017 with a biomass estimate (± 95% CI) of 1,333 ± 

1,482 t (Table 13, Fig. 42b) and abundance estimate (± 95% CI) of 0.7 ± 0.8 million crab (Table 

14) representing 52% of the total male estimated biomass which is below the average of 2,807 ± 

773 t from the previous 20 years (Table 13). 

Mature male blue king crab were caught at 13 of the 56 stations surveyed in the St. Matthew 

Island Section sampling strata and 100% of the 39 mature and 9 immature males caught were 

measured (Table 5, Figs. 43 and 44). The mature male biomass estimate in 2017 was 1,721 ± 

1968 t, representing 45% of the total male estimated biomass (Table 13), while the immature 

male biomass was estimated at 122 ± 155 t (Table 5). Historically, one station (R-24) has greatly 

impacted population estimates for St. Matthew Island blue king crab. In 2017, 51% of the mature 

males were caught at R-24, compared to 17% in 2016 (Fig. 44). The majority of the immature 

male blue king crab were distributed within the 100 m isobath south of St. Matthew Island while 

the majority of mature males were caught south of St. Matthew island, with the exception of 

station R-24 north of St. Matthew Island (Figs. 43 and 44).

Overall St. Matthew Island blue king crab male abundance decreased in 2016 compared to 2015 

and 2014, including newshell and oldshell crabs (Fig. 45). In 2017, 93% of the legal-sized males 

were new hardshell crabs, and the two stations with the highest catches were nearshore to the 

north (R-24) and southwest (PO2726) of St. Matthew Island (Fig. 46).

The 2017 mature female blue king crab biomass estimate was 0.0 ± 0.0 t and abundance was 

0.0 ± 0.0 million crab (Table 14), as there were no mature females caught in the St. Matthew 

Island Section (Table 13). Six immature females were caught at two stations in the St. Matthew 

Island Section sampling strata (Fig. 43). All 6 immature females were new hardshell crabs (Fig. 

47).
15

The centers of distribution for both males and female blue king crab are located within a 30 nmi 

by 30 nmi region around St. Matthew Island (Fig. 48). The center of the blue king crab 

distribution has randomly moved within this region without a clear pattern of years proximal to 

each other. In 2017, the mature male center of distribution was located approximately 10 nmi 

south of St. Matthew Island (Fig. 48).

NMFS survey abundance estimates for St. Matthew blue king crab do not exist prior to 1978. 

As such, production cannot be compared before or after the 1977 regime shift. Size distribution 

abundance estimates (Figs. 49 and 50) suggest that production of male crabs has been relatively 

stable in recent years. In 2017, the abundance of pre-recruit male crab in the 105-119 mm size 

class was low compared to 2016 and 2015, and below the previous 20-year average (Fig. 12). 

The high variability suggest trends should be interpreted with caution. It is important to highlight

that recent fluctuations in population abundance estimates are primarily caused by catch numbers 

in one station (R-24). 

Tanner Crab 

In 2011, the ADF&G Board of Fish changed the legal-size limit of Tanner crab from 

≥ 5.5 inches CW (138 mm, without spines) to ≥ 4.4 inches CW (110 mm, without spines) west of 

166°W and ≥ 4.8 inches CW (120 mm, without spines) east of 166°W (Table 1). According to 

the regulatory harvest strategy of the State of Alaska (5 AAC 35.508), the annual TAC or GHL 

for Tanner crab in both areas is determined by the biomass estimate of males ≥ 125 mm CW. 

The harvest strategy is based on the assumption that the commercial fishery will target legal size 

crab (Zheng and Pengilly 2011), although the industry may self-impose retention of crab 

≥ 4.9 inches CW (125 mm, without spines) east and west of 166°W. We provided the 2017 

biomass estimates for the two legal-size categories as well as for ≥ 4.9 inches CW east and west 

of 166°W in the abstract. 

Tanner crab were caught at 96 of the 120 stations east of 166°W, and 160 of the 255 stations 

west of 166°W. Among those stations west of 166°W, Tanner crab occurred at 40 and 6 stations 

within the high-density areas of the Pribilof District and St. Matthew Island Section, respectively 

(Fig. 51a; Appendix). Tanner crab were caught at an average depth of 66.4 m (SD = 22.0 m) east 

of 166°W, and 106.6 m (SD = 33.0 m) west of 166°W, which are similar to what has been 

observed throughout the entire time series.

Legal-sized Tanner crab were caught at 76 of the 120 stations east of 166°W, and 101 of the 

255 stations west of 166°W (Table 5, Fig. 51b). All of the legal-sized males caught east of 

166°W were measured, while 99.9% of the legal-sized males caught west of 166°W were 

measured (Table 5).

The 2017 biomass estimate (± 95% CI) for legal male Tanner crab east of 166°W was 15,675 ± 

5,221 t (Table 15), with an associated abundance estimate of 21.8 ± 7.1 million crab. Seventy 

three percent of legal males were ≥ 4.9 inches CW, with a biomass estimate of 12,470 ± 4,399 t 

(15.9 ± 5.5 million crab; Tables 15 and 16). The 2017 estimated biomass of legal Tanner crab in 

the eastern area was above the 20-year average biomass of 12,148 ± 3,108 t. The majority of the 
16

Tanner males ≥ 113 mm CW occurring east of 166°W were distributed in the southwest section 

of Bristol Bay (Figs. 52 and 53).

The 2017 biomass estimate for legal male Tanner crab west of 166°W was 21,288 ± 7,339 t 

(Table 17), while abundance was estimated at 34.9 ± 10.9 million crab. Forty-eight percent of 

legal males were ≥ 4.9 inches CW, for a biomass estimate of 12,553 ± 5,631 t (16.8 ± 7.1 million 

crab; Tables 17 and 18). The 2017 estimated biomass of legal Tanner crab in the western area 

was well above the 20-year average biomass of 16,213 ± 4,990 t. The majority of Tanner males

≥ 103 mm CW occurring west of 166°W were distributed around the Pribilof Islands (Figs. 52 

and 53).

In 2017, a total of 3,643 male Tanner crab chela height measurements were collected on the EBS 

bottom trawl survey. The scatterplot of the allometric relationship between chela height and 

carapace width using data collected in 2008, 2010, 2012, 2014, 2016, and 2017 (n = 10,465 for 

all years combined) graphically represents two distinct maturity groups: immature, small claw 

males with a ratio of less than 0.18 and mature, large claw males with a ratio greater than or 

equal to 0.18 (Fig. 54). The carapace widths for small claw males ranged from 10.0 to 157.2 mm 

compared to 59.5 to 177.2 mm for large claw males. Large claw males with carapace widths 

below the legal-size limit will not recruit to the fishery in the future, as morphometrically mature 

male Chionoecetes spp. crab will not molt again during their lifespan (Tamone et al. 2007).

In the areas east and west of 166°W, overall newshell males decreased slightly (Figs. 55 and 56). 

In both areas, for male crabs above 100 mm CW the oldshell category dominated newshell, 

while both categories were primarily distributed in the southwest section of the EBS shelf at 

depths greater than 50 m (Fig. 57).

The 2017 mature female Tanner crab biomass estimates east and west of 166°W were 1,985 ± 

769 t and 5,019 ± 3,069 t (10.2 ± 4.0 and 35.6 ± 21.4 million crabs), respectively, while the 

immature female Tanner crab estimated biomasses east and west of 166°W were 158 ± 122 t and 

1,255 ± 493 t, respectively (Tables 5, 15-18). Twenty-nine percent of the mature female 

population were distributed east of 166°W in the ADF&G Eastern management district, within 

the central and southwestern areas of the Bristol Bay District (Fig. 52). In the eastern area only, 

approximately 2% of the mature females were softshell, while 10% were new-hardshell and 88% 

were oldshell and very oldshell (Fig. 58). In the western area only, less than 1% of the mature 

females were softshell, while 19% were new-hardshell and 81% were oldshell or very oldshell 

(Fig. 59). In the eastern region 59% of the mature females carried newly extruded embryos while 

29% were brooding eyed embryos, had not produced a new clutch, or were barren (Fig. 58). In 

the western region, 90% of the mature females carried newly extruded embryos, while 

approximately 1% were brooding eyed embryos and 9% had empty egg cases or were barren 

(Fig. 59). In the eastern region, 23% of the mature females were 1/2 full, 35% were 3/4 full, and 

18 % were full, while in the western region 10% were 1/2 full, 29% were 3/4 full, and 46% were 

full (Figs. 58 and 59).

Pulses of strong recruitment to the mature male and female population appear to have been 

cyclical throughout the eastern Bering Sea (Figs. 60 and 61), yet it is unclear what environmental 

conditions triggered the pulses, or if strong cohorts are sequentially linked as theorized for snow 
17

crab (Ernst et al. 2005, Ernst et al. 2012, Parada et al. 2010). Shell condition can be used to infer 

if mature female Tanner crab are primiparous (first clutch of eggs) or multiparous (subsequent 

clutches). For example, mature newshell female crabs (shell condition 2) are assumed to be 

primiparous (first clutch of eggs) and likely molted to maturity during the prior winter (Ernst 

et al. 2005). 

The shell condition time series demonstrates that the survey fails to detect portions of the 

population. For example, the population estimate of newshell (shell condition 2) female Tanner 

crab east of 166°W was 37 million in 1990, yet the estimate of oldshell (shell condition 3) 

mature females was 76 million in 1991 (Fig. 60). Assuming newshell females become oldshell 

the following year, estimates of oldshell females should be at or below levels of newshell 

females the year prior. Further, the shell condition time series for mature male Tanner crab 

should be interpreted with caution, as physiological, morphological, and functional male 

maturity vary by size. In most of the historical survey data, it is not possible to differentiate 

morphologically mature and immature males. Thus, a size cutoff is suboptimal for assessment of 

mature crabs, and future research will strive to refine the accuracy of estimating mature 

population abundances. 

The centers of distribution for both males and female Tanner crab have moved within a 160 nmi 

by 100 nmi region east of the Pribilof Islands and west of Bristol Bay (Fig. 62). The center of the 

distribution moved from the eastern extent of the distribution in the 1970s to the western extent 

in more recent years. 

There is little evidence of changes in Tanner crab production related to the 1977 regime shift 

(NPFMC 2016), yet pulses of strong production have been cyclical from 1975 to the present 

(Figs. 63-66). A less pervasive regime shift occurred in 1989, as characterized by briefly 

negative ALPI and PDO indices, but the system did not return to pre-1977 conditions. A slight 

increase in Tanner crab production coincided with the 1989 shift, although the links between 

climate and crab production remain speculative. Male pre-recruit abundance both east and west 

of 166°W was down relative to 2016, and levels are above the average over the past 20 years 

(Fig. 12). The male size frequency distribution in 2014 reveals an increase in abundance of male 

crabs between 100 and 125 mm CW west of 166°W, which may be related to the slight increase 

of crabs between 120 and 140 mm CW in 2015 and 2016, though this size category has 

decreased as of 2017 (Figs. 63-66).

Snow Crab

Although the legal minimum size limit for male snow crab is 3.1 inches CW (78 mm), processors 

currently prefer a minimum size of 4.0 inches CW (102 mm). The biomass estimates for male 

snow crab are reported for both legal and preferred size categories in the abstract.

Snow crab were caught at 223 of the 375 stations in the combined areas of the Bristol Bay 

District, Pribilof District, and St. Matthew Island Section sampling strata (Fig. 67a). Snow crab 

were caught at an average depth of 93.5 m (SD = 27.5 m), similar to what has been observed 

throughout the history of the survey.
18

Legal-sized snow crab were caught at 197 of the 375 standard stations and 75% of the legal-sized 

males caught were measured (Table 5, Fig. 67b). Legal-sized male snow crab estimated biomass 

(± 95% CI) was 52,272 ± 13,399 t (Table 19) and abundance was 151.9 ± 43.6 million crab 

(Table 20) which was 4% of the total male abundance. This biomass remains much lower than 

the 20-year (1997- 2016) average legal male snow crab biomass of 126,464 ± 30,181 t. Twentyfour percent of those legal males were ≥ 4.0 inches CW with a biomass estimate of 20,740 ± 

5,817 t (36.0 ± 9.9 million crab). Mature males (≥ 95 mm CW) were distributed throughout the 

EBS survey area in waters deeper than 50 m (Figs. 68 and 69).

The scatterplot of the allometric relationship between chela height and carapace width using the 

data collected in 2009 (n = 1,303), 2011 (n = 1,130), 2013 (n = 943), 2015 (n = 1,008) and 2017 

(n = 3,328) graphically represents two distinct maturity groups for snow crab; immature males 

(small claw) with a ratio of < 0.20 and mature males (large claw) with a ratio of ≥ 0.20 (Fig. 70). 

The carapace widths for small claw males ranged from 7.9 to 121.2 mm compared to 40.3 to 

151.6 mm for large claw males.

An increase in the number of juvenile new hardshell males in the 30 to 75 mm size category was 

observed over the past 4 years; however, these strong size classes did not appear in subsequent 

years in larger size categories (Fig. 71). Among legal-sized male crab in 2017, 0% were in 

molting or softshell condition while approximately 60% were in new-hardshell condition and 

distributed largely between the 50 and 100 m isobaths in the middle shelf of the EBS survey area 

as well as between the 100 and 200 m isobaths in the northwest area of the EBS shelf (Figs. 71 

and 72). Approximately 40% of the legal-sized males were either oldshell or very oldshell 

condition crabs, and were primarily distributed between the 100 and 200 m isobaths within the 

EBS region (Fig. 72).

The mature female snow crab biomass estimate of 103,422.± 44,445 t and abundance estimate of 

2,087 ± 924 million crab was 61% of the total female estimated biomass (Tables 19 and 20). The 

immature female crab biomass estimate was 66,242 ± 24,909 t (Table 19). Among sampled 

mature females, 47% were in new-hardshell condition and 52% were oldshell and very oldshell 

condition (Fig. 73). Ninety-three percent of the mature females were brooding new embryos, 

while less than 1% had eyed embryos (Fig. 73). Two percent of the mature females had empty 

egg cases, and 4% were barren, while 27% of mature females with embryos were either 75% or 

100% full (Fig. 73).

Pulses of strong recruitment to the mature female population have been cyclical (Fig. 74), and it 

is hypothesized that strong cohorts are sequentially linked (see Ernst et al. 2012, Parada et al. 

2010 for a detailed discussion). As with Tanner crab, shell condition can be used to infer if 

mature female snow crab are primiparous (first clutch of eggs) or multiparous (subsequent 

clutches). Mature newshell female crabs (shell condition 2) are assumed to be primiparous (first 

clutch of eggs) and likely molted to maturity during the prior winter (Ernst et al. 2005). Strong 

cohorts of mature primiparous females occurred approximately every 7 years starting in 1980 

(Fig. 74), which matches the theoretical time required between egg extrusion of mature females 

and those offspring reaching maturity (Ernst et al. 2012). It is unknown what specific 

environmental conditions triggered the initial pulse or how long the sequence may last. 
19

As with Tanner crab, the shell condition time series demonstrates that the survey fails to detect 

portions of the population. For example, population estimates of newshell (shell condition 2) 

female snow crab were 125 million in 1999, yet estimates of oldshell (shell condition 3) mature 

females was nearly 1,000 million in 2000 (Fig. 74). Estimates of oldshell females should be at or 

below levels of newshell females the year prior. As with Tanner crab, the shell condition time 

series for mature male snow crab should be interpreted with caution, as physiological, 

morphological, and functional male maturity vary by size, and it is not possible to differentiate 

morphologically mature and immature males in most survey data. Future research will strive to 

refine the accuracy of estimating mature population abundances.

With the exception of 1975 to 1979, the centers of distribution for both males and female snow 

crab have moved within a 120 nmi by 120 nmi region between St. Matthew Island and the 

Pribilof Islands (Fig. 75). The center of snow crab distribution moved dramatically to the 

northwest after 1979. Since then, the centers of distribution have moved throughout the 

distribution with males having a broader distribution while females are located more to the north. 

The 2017 mature female center of distribution was among the farthest north, located near St. 

Matthew Island (Fig. 75).

Mature male abundance and biomass are substantially down from 2014 and 2015, and marginally 

lower than in 2016, while pre-recruit abundance and biomass are both increased relative to 2016, 

but are still substantially lower from 2014 and 2015 estimates (Figs. 8-9, 12 and 76). Abundance 

and biomass estimates for both male categories remain below the previous 10-year average (Figs. 

8-9, 12 and 76). 

Mature female abundance and biomass are substantially higher than 2016 estimates, and are 

higher than the previous 10-year average (Figs. 10-11, and 77). An increase in juvenile 

abundance over the past 4 years provides further hope for strong recruitment in upcoming years 

(Figs. 71, 76, and 77). Ovigerous female snow crab held in water with temperatures below 

1.5 °C become biennial spawners in the Bering Sea (NPFMC 2016). Consequently, 

environmental conditions relating to temperature, including the extent of the cold pool, are likely 

to regulate recruitment strength via the relative numbers of annual to biennial spawners, and 

individual fecundity of the female crab.

Chionoecetes spp. Hybrid

Chionoecetes spp. hybrid crab were caught at 101 of the 375 stations in the combined areas of 

the Bristol Bay, Pribilof, and Northern Districts (Fig. 78a; Appendix). 

In this document, Chionoecetes spp. hybrid crab size classes for legal males and mature females 

are based on the size categories for snow crab (see Snow Crab section and Table 1). Legal-sized 

male Chionoecetes spp. hybrid crab were caught at 81 stations, throughout all Districts 

combined, resulting in a biomass estimate (± 95% CI) of 4,143 ± 1,284 t and were primarily 

distributed around the Pribilof Islands between 50 and 100 m (Fig. 78b). Seventy-one percent of 

those legal males were ≥ 4 inches in carapace width, with a biomass estimate of 3,451 ± 1,152 t

with most as new hardshell or oldshell (Fig.79b). Sublegal male Chionoecetes spp. hybrid crab 
20

were distributed throughout the northeastern Bering Sea shelf at depths greater than 50 m (Fig. 

79a).

The 2017 mature female Chionoecetes spp. hybrid crab biomass estimate was 587 ± 310 t and 

the immature female crab biomass estimate was 57 ± 56 t. The majority of the mature female

Chionoecetes spp. hybrid crab were distributed south of the Pribilof Islands and St. Matthew 

Island and between 100 and 200 m in the northwestern area of the eastern Bering Sea shelf 

(Fig. 79a). Twenty-six percent of the mature female abundance was located at one station 

(K-24) north of St. George Island (Fig. 78a).

Other Crab Stocks and Species of Interest 

Northern District Red King Crab

Red king crab were caught at 19 stations in the Northern District (Fig. 80) outside of the current 

management units where red king crab are commercially fished (Fig. 5). Legal-sized males were 

caught at 14 of those stations and the density at a station ranged from 73 to 296 crab nmi-2

(Appendix). The 2017 biomass estimate (± 95% CI) of legal-sized males was 2,138 ± 942 t while 

the biomass estimate of mature and immature males was 2,393 ± 967 and 78 ± 85 t, respectively. 

The biomass estimate of mature female red king crab was 404 ± 227 t. The majority of mature

males and mature female red king crab were caught near the 50 m isobath at stations south and 

west of Nunivak Island (Fig. 80).

Northern District Blue King Crab

No Northern District blue king crab were caught in 2017 (Fig. 81).

Hair Crab

In this report, legal male hair crab (Erimacrus isenbeckii) are defined as > 3.25 inches CW 

(≥ 83 mm CL) which was specified in the previous Pribilof District fishery while the female hair 

crab biomass estimate is presented for all sizes combined. Hair crab were caught at 48 of the 375 

stations throughout all Districts combined on the survey (Fig. 82). The 2017 density of legal 

male hair crab caught at a station ranged from 62 to 457 crab nmi-2 resulting in a biomass 

estimate of 1,084 ± 364 t (Table 21) and abundance of 1.6 ± 0.6 million crab (Table 22).

Historically, hair crab have been concentrated just north of the Alaska Peninsula and near the 

Pribilof Islands. In 2017, legal male hair crab were primarily concentrated near St. Paul Island 

and distributed along the 50 m isobath from the Alaska Peninsula to Nunivak Island (Fig. 82).

The 2017 sublegal male hair crab biomass estimate (± 95% CI) was 208 ± 140 t and the female

hair crab biomass estimate was 71 ± 45 t (Table 21). Sublegal males were caught near St. Paul 

Island and west of Nunivak Island (Fig. 82).

The Pribilof District hair crab fishery has been closed since 2000 due to a shift in the distribution 

of legal males to the Northern District and, after one year of experimental fishing with minimal 

vessel participation, the Northern District fishery was closed in 2001 (Fitch et al. 2012). Biomass 

estimates of both size classes of male hair crab have been on an increasing trend between 2005 

and 2013 and then there was a decline in biomass every year from 2014 to 2016. In 2017, the 
21

2017 biomass estimate for legal-sized male hair crab was higher than 2016, but lower than the 

20-year average of 1,873 ± 616 t (Table 21).

Golden King Crab

No golden king crab were caught in 2017.

NORTHERN BERING SEA EXTENSION OF THE 2017 STANDARD SURVEY

Northern Bering Sea Survey Overview and Data Collection

The northern Bering Sea extension of the 2017 EBS standard survey (NBS) consisted of 144 

total bottom trawls conducted from 1 August to 2 September 2017 covering an area of 

approximately 58,145 nmi2 (Fig. 83a). The survey was conducted immediately after the eastern 

Bering Sea survey onboard the chartered fishing vessels FV Alaska Knight and FV Vesteraalen

(Fig. 83b).The latitude and longitude of the midpoint of each successful tow along with the 

duration (hr), distance fished (km), bottom depth (m), and bottom temperatures (°C) are listed in 

the Appendix. The mean distance fished was 1.49 nmi (2.77 km, SD = 0.18 nmi) with a range of 

0.70 to 1.67 nmi (1.30 to 3.10 km), and the mean fishing time was 30 minutes (0.50 hr, SD = 

3 min). The fishing depth of the 83-112 otter trawl net ranged from 9 to 77 m with a mean gear 

depth of 36.1 m (SD = 15.6). The mean net width per tow ranged from 13.2 to 18.9 m and the 

average mean net width for all 144 successful tows was 15.5 m (SD = 1.1 m). 

The mean bottom temperature per tow in the NBS area ranged from -1.6° to 13.4°C (Fig. 84a). A 

cold pool of water < 2°C was prevalent west and south of St. Lawrence Island with cooler 

temperatures persisting at stations along 50 m isobath and deeper. Warmer bottom temperatures 

were evident in Norton Sound and in shallow waters along the Alaska coastline, south of Norton 

Sound. The warm waters northwest of Nunivak Island pushed out towards the Pribilof Islands in 

a time period of less than 5 weeks (Fig. 84b).

Norton Sound Section, Northern Bering Sea Red King Crab

Red king crab (Paralithodes camtschaticus) were caught at 20 of the 43 stations within the

Norton Sound Section of the Northern Bering Sea district in 2017 (Figs. 85-89). Norton Sound 

legal males are defined by ADF&G as ≥ 104 mm CL and mature males are ≥ 94 mm CL (Zheng

et al. 2010), while Otto et al. (1990) defined 50% maturity in Norton Sound females at 71 mm 

CL. Norton Sound red king crab were caught at an average fishing depth of 21.0 m (SD = 6.2 m). 

The density of legal-sized male crab caught at a station ranged from 74 to 622 crab nmi-2 (see 

Appendix) with the center of the stock distribution located near the western edge of the Norton 

Sound Section (Fig. 89). Legal-sized male Norton Sound red king crab were caught at 11 stations 

(see Appendix), resulting in a total biomass estimate (± 95% CI) of 1,070 ± 835 t and a total 

abundance estimate (± 95% CI) of 0.8 ± 0.6 million crab in the Norton Sound Section. 

The majority of mature males were concentrated on the western edge of the Norton Sound 

Section, around stations BB-03 and CC-03, with the center of the stock distribution located near 

the western edge of the Norton Sound Section (Fig. 86). The estimated biomass of mature crab 
22

was 1,192 ± 951 t and a total abundance estimate (± 95% CI) of 1.0 ± 0.8 million crab. The 

highest density of immature male red king crab was caught at the northern Norton Sound Section 

station EE-02 (Fig. 86). The estimated biomass of immature crab was 296 ± 299 t and a total 

abundance estimate (± 95% CI) of 1.5 ± 1.1 million crab.

The biomass estimate of mature female red king crab within the Norton Sound Section was 213

± 205 (t) while the biomass estimate of immature females was 36 ± 30 (t). The majority of 

mature and immature female red king crab were caught in near shore and shallow waters, where 

the highest density of immature female red king crab were caught at the northern Norton Sound 

Section station EE-02 and the center of stock distribution for mature females was located in 

middle of the Norton Sound Section (Fig. 86).

In 2017, red king crab males in the Norton Sound Section were primarily new hardshell with 

72% and 24% of the males in old or very old shell condition, respectively (Fig. 89), while red 

king crab females were all new hardshell. Fourteen percent of the females were brooding uneyed 

embryos, within 70 mm to 108 mm CL size range, while the remaining balance were immature 

(Fig. 90).

Red king crab were caught at six stations outside of the defined management area of the Norton 

Sound Section and not included in the biomass estimates reported for Norton Sound Section red 

king crab in the previous paragraphs (Figs. 85 and 86). The centers of stock distribution for all 

northern Bering Sea legal-sized and mature red king crab males were located on the western 

edge of the Norton Sound Section (Fig 88). Five legal males, two new hardshell and three

oldshell, and two mature new hardshell females with uneyed eggs were caught south west of 

Cape Romanzof (see Appendix).

Northern Bering Sea Blue King Crab

Blue king crab (Paralithodes platypus) were caught at 29 of the 145 northern Bering Sea stations 

in 2017 (Figs. 91-95). Blue king crab size categories in the NBS area are the same as the St. 

Matthew Island blue king crab (Table 1). Legal-sized males were caught at stations near St. 

Lawrence with a density ranging from 71 to 564 crab/nmi2 (see Appendix). The 2017 biomass 

estimate of legal-sized males was 1,274 ± 1,013 (t) and the biomass estimate of mature and 

immature males was 2,315 ± 1,726 and 1,237± 866 (t), respectively. The centers of stock 

distribution for both legal and mature male blue king crab were located north of St. Lawrence 

Island (Figs. 92-94).

The biomass estimate of mature female blue king crab was 1,468 ± 1,324 (t) while the biomass 

estimate of immature females was 810 ± 635 (t). The majority of mature and immature females 

were distributed off the northwest coast of St. Lawrence Island, and the center of stock 

distribution was located north of St. Lawrence Island (Fig. 92). 

The majority of blue king crab males caught in the NBS area were in new hardshell condition 

with 7% of the males in oldshell and very oldshell condition, in the 100 mm to 124 mm CL size 

range (Fig. 95). Female blue king crab were primarily in new hardshell condition (Fig. 96). Of 
23

the new hardshell females, 68% were immature while 20% were brooding uneyed embryos and 

the remaining had no eggs or empty egg cases. Of the oldshell or very oldshell females, 80%

were brooding uneyed embryos, while 20% were immature (Fig. 96).

Northern Bering Sea Tanner Crab

Five immature Tanner crab (Chionoecetes bairdi) were caught in the northern extension area at 

AA-19 and ZZ-23, one new hardshell male and four new hardshell female (see Appendix).

Northern Bering Sea Snow Crab

Snow crab (Chionoecetes opilio) were caught at 108 of the 145 northern Bering Sea stations 

(Figs. 97-100). Because overall colder conditions reduce size-at-maturity for northern Bering Sea 

crabs relative to eastern Bering Sea stocks, it was necessary to develop a new size estimate at 

maturity specific to NBS snowcrabs, the process for which is described separately. Analysis of 

chela height/carapace width data suggests a carapace width at 50% morphometric maturity of 

68 mm, 27 mm smaller than the corresponding metric for eastern Bering Sea snowcrab. 

The majority of legal-sized and mature male snow crab were caught at stations near St. 

Lawrence, as well as in the northern most region of the northern Bering Sea (Figs. 98 and 100).

The density of legal-sized male crab caught at a station ranged from 67 to 1,229 crab nmi-2 (see 

Appendix)., with a total biomass estimate (± 95% CI) of 75 ± 78 t and a total abundance estimate 

(± 95% CI) of 0.2 ± 0.2 million crab. The estimated biomass of mature crab was 349 ± 206 t and 

a total abundance estimate (± 95% CI) of 2.2 ± 1.3 million crab. Immature male snow crab were 

found throughout the northern Bering sea with a biomass estimate of 135,802 ± 52,019 t and a 

total abundance estimate (± 95% CI) of 7,365 ± 3,259 million crab (Fig. 98).

The biomass estimate of mature female snow crab was 6,147 ± 2,558 (t) while the biomass 

estimate of immature females was 80,918 ± 34,520 (t). Immature female crabs were distributed 

throughout the northern Bering Sea, where the majority of mature female crabs were caught to 

the west and southwest of St. Lawrence Island (Fig. 98).

Ninety-nine percent of male snow crab caught in the northern Bering Sea were new hardshell 

with < 1% males in oldshell condition. Ninety-seven percent of the females were new hardshell 

and 3% females were oldshell and very oldshell combined (Fig. 101). Of the new hardshell 

females, 82% were immature, while 17% were brooding uneyed embryos and the remaining had 

eyed eggs. Of the oldshell or very oldshell females, 95% were brooding uneyed embryos, while 

<1% had eyed eggs (Fig. 101).

Northern Bering Sea Snow Crab Male Maturity Analysis

Cold conditions in the northern Bering Sea (NBS) region reduce crab growth rates, resulting in a 

reduced size at maturity for both male and female crabs. Further, it is currently unknown whether 

these same cold conditions also affect allometric growth patterns in crabs, altering allometric 
24

relationships relative to those observed in the same species in other, warmer, regions. 

Consequently, in determining maturity of male snow (Chionoecetes opilio) crabs sampled during 

the northern Bering Sea survey, it was not possible to apply size-at-maturity estimates previously 

obtained for the eastern Bering Sea (EBS) stock, nor was it advisable to directly apply 

morphometric parameters used for other stocks (i.e., a chela height (CH)/carapace width (CW) 

ratio of 0.20) without first conducting a study to ensure similar allometric growth relationships. 

As a result, it was necessary to develop a custom index of maturity specifically for the NBS 

opilio crab stock.

Nine-hundred and five paired measurements of male snow carapace width and chela height were 

recorded during the survey. Of these, five records were rejected as erroneous due to very small 

CH/CW ratios, for a final sample size of n = 900 paired measurements. Visual analysis of a 

scatterplot of chela height versus carapace width (Fig. 102) indicates the presence of two clouds 

representing large and small-chela crab. Notably, large-chela crab represent a much smaller 

proportion of the sampled population than is the case for the EBS (Fig. 70), and these clouds do 

not exhibit as distinct of a separation. Due to the small size of the large clawed crab sample, 

histograms of the individual chela height/carapace width ratios do not display the bimodal 

distribution that forms the basis of the use of a given ratio as a maturity indicator as per (Tamone 

et al. 2007). Application of linear discriminant analysis as has been done in other stocks 

(Comeau and Conan 1992, Conan and Comeau 1986, Sainte-Marie and Hazel 1992) requires use 

of a priori classified known mature and immature groups. To be a valid approach here, this 

methodology would require supporting information on sexual maturity that we do not presently 

possess. 

As a consequence, for the purpose of this document a mixture of two regressions approach was 

employed, with models being fitted via functions native to the R package mixreg. This approach 

requires only the presence of two groups of data within the given dataset, with the response 

variable having a linear relationship to the predictor, and iteratively fits two regressions to the 

dataset, using the Expectation-Likelihood (EL) approach, a modification of Maximum 

Likelihood (ML) methodologies (Turner 2000). Parameters for an estimated dividing 

line/classifier may be calculated as

b0 = β01* σ2/(σ1+ σ2) + β02 * σ1/(σ1+ σ2)

b1 = β11* σ2/(σ1+ σ2) + β12 * σ1/(σ1+ σ2);

where β01, β02, β11, β12, σ1, σ2 are estimated regression model parameters calculated via the 

function mixreg(). Crab were classified as mature when carapace width > 30 mm and ln(CH) >

b0 + b1 * ln(CW), and as immature when carapace width ≤ 30 mm or ln(CH) < b0 + b1 * ln(CW). 

Use of a cutoff minimum size of 30 mm was based on the minimum observed size of a clutch 

bearing female, and was adopted to prevent misclassification of very small crabs.

Mature and immature crab were apportioned into 10 mm carapace width bins, and proportion of 

mature crab within each of these bins was calculated. Size at 50% maturity was then estimated 

by using non-linear least squares procedures native to the R package nlme to fit the logistic 

equation

PP = 1/(1 + ee�−aa∗(WW−bb)�

);
25

where

P = proportion of mature crab within a given 10 mm size bin

a = 1⁄4 slope of the tangent to the maturity curve at the inflection point

b = carapace width at 50 % maturity

W = mid-point of 10 mm carapace width bin.

By these procedures, carapace width at 50% maturity for northern Bering Sea snow crab was 

estimated to be 68.36 mm (Fig. 103). 

Northern Bering Sea Chionoecetes spp. hybrid

Six immature Chionoecetes spp. hybrid crab were caught in the northern Bering Sea at stations 

V-01, T-18 and S-18, three new hardshell male and three new hardshell female (see Appendix).

Northern Bering Sea Hair Crab

Hair crab (Erimacrus isenbeckii) were caught at 11 of the 145 northern Bering Sea stations in 

2017, all south of St. Lawrence Island (Fig. 104-107). A total of 34 hair crab were caught; 6 sublegal males, 21 legal males and 7 females (Fig. 105). The biomass estimate for sub-legal males 

(< 83 mm CL) was 71 ± 74 (t) while the biomass estimate legal-sized males was 358 ± 354 (t).

The biomass estimate for all females was 45 ± 53 (t). The majority of both male and females 

were new hardshell.

27

ACKNOWLEDGMENTS

We thank Captain Steven Elliott of the FV Vesteraalen, and Captain Shawn Russell of the FV 

Alaska Knight and all their crew without whom the annual eastern Bering Sea and northern 

Bering Sea extension bottom trawl surveys would not occur. We also thank the dedicated Field 

Party Chiefs, Deck Leads, and scientific crew from AFSC, ADF&G, and all those who 

volunteered for the survey. The scientific personnel who made up the 2017 “crab crew” 

included; J. Andres (USCG), A. Bateman (AFSC, Kodiak lab), D. Benjamin (AFSC, Seattle), R. 

Foy (AFSC, Kodiak Lab), T. Jackson (ADF&G), P. Jensen (AFSC, Seattle), W.C. Long (AFSC, 

Kodiak Lab), V. Lowe (AFSC Contractor), J. Newby (AFSC, Kodiak Lab), C. Pagett (AFSC, 

Kodiak Lab), J. Richar (AFSC, Kodiak Lab), D. Wehde (NSEDC), and M. Wesphal (ADF&G).

29

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34

Table 1. -- Definition of carapace size classes for crab species caught in National Marine Fisheries Service’s eastern Bering Sea 

standard survey. Carapace length (CL) is measured for Paralithodes spp. and Erimacrus isenbeckii, while carapace width 

(CW excluding spines) is measured for Chionoecetes species. We define female maturity based on abdominal flap 

morphology and egg presence throughout this document. The legal size classes defined by ADF&G (CW in inches) 

include spines.

Species District Immature Mature Pre-recruit Legal Male

Paralithodes Bristol Bay male < 120 mm ≥ 120 mm 110-134 mm ≥ 135 mm CL or ≥ 6.5 in. CW

camtschaticus Pribilof male < 120 mm ≥ 120 mm 120-134 mm ≥ 135 mm CL or ≥ 6.5 in. CW

Norton Sound male < 94 mm ≥ 94 mm 90-120 mm ≥ 104 mm CL or ≥ 4.8 in. CW

P. platypus Pribilof male < 120 mm ≥ 120 mm 120-134 mm ≥ 135 mm CL or ≥ 6.5 in. CW

St. Matthew male < 105 mm ≥ 105 mm 105-119 mm ≥ 120 mm CL or ≥ 5.5 in. CW

Northern Bering 

Sea male <105 mm ≥ 105 mm 105-119 mm ≥ 120 mm CL or ≥ 5.5 in. CW

Chionoecetes East of 166o

W male < 113 mm ≥ 113 mm 113-124 mm ≥ 120 mm or ≥ 4.8 in. CW1

bairdi West of 166o

W male < 103 mm ≥ 103 mm 103-124 mm ≥ 110 mm or ≥ 4.4 in. CW1

Preferred male ≥ 125 mm or ≥ 5.0 in. CW

Chionoecetes

Eastern Bering 

Sea male < 95 mm ≥ 95 mm 95-101 mm ≥ 78 mm or ≥ 3.1 in. CW2

opilio EBS Preferred male ≥ 102 mm or ≥ 4.0 in. CW

Northern Bering

Sea male < 68 mm ≥ 68 mm 78-101 mm ≥ 78 mm or ≥ 3.1 in. CW

NBS Preferred Male ≥ 102 mm or ≥ 4.0 in. CW

Erimacrus isenbeckii male ≥ 83 mm CL or > 3.25 in. CW3

1 The legal minimum size limit for C. bairdi is ≥ 4.8 inches CW (120 mm excluding spines; 122 mm including spines) east of 166° W and ≥ 4.4 inches CW 

(110 mm excluding spines; 112 including spines) west of 166° W (ADF&G reg. 5 AAC 35.520(b)(1)). 2 The legal minimum size limit for C. opilio is 3.1 inches CW (78 mm excluding spines; 79 mm including spines. 3 Legal-sized male crab for E. isenbeckii are larger than a minimum size of 3.25 inches CW (≥ 83 mm CL) defined by Alaska Department of Fish and Game 

permit guidelines.
37

Table 2. -- History of methods for determining trawl on bottom and estimating net width on 

National Marine Fisheries Service eastern Bering Sea bottom trawls.

*Single value used for net width when calculating area-swept.

Year Net width (m) Trawling methodology

1975 First and only year tow duration = 1 hour

1976-2012 Tow duration = 30 minutes

1975-1995 Brake set and haul back of winch drum wire defined 

trawl contact with seafloor (net on bottom)

1996-2012 Began using bottom contact sensors to determine 

trawl contact with seafloor

1975 - 1980 12.2 Mean width of 400-mesh eastern trawl*

1981 18.0 Mean width* of 83-112 Eastern trawl for Vessel 1

1981 13.4 or 14.3 Mean width* of 400-mesh Eastern trawl measurements

different on haul 1-112 and 114-156 for Vessel 37*

1982 - 1987 Variable with Rose and Walters (1990) calculated the 83-112 net

each tow width based on an inverse relationship to net scope

1988 - 2001 Variable with All survey vessels used ScanMar acoustic sensors

each tow on the 83-112 trawl net

2001 - 2012 Variable with All survey vessels used NetMind acoustic sensors

each tow on the 83-112 trawl net

2013 - 2017 Variable with All survey vessels used Marport acoustic sensors

each tow on the 83-112 trawl net
38

Table 3. -- Weight-size regression relationships used to calculate biomass of crab species caught 

in National Marine Fisheries Service eastern Bering Sea bottom trawl surveys.

Stock Sex a b

Bristol Bay males 0.000403 3.141334

red king crab females n/a n/a

non-ovigerous females 0.000408 3.127956

ovigerous females 0.003593 2.666076

Pribilof Islands males 0.000403 3.141334

red king crab females n/a n/a

non-ovigerous females 0.000408 3.127956

ovigerous females 0.003593 2.666076

Pribilof Islands males 0.000508 3.106409

blue king crab females 0.02065 2.27

non-ovigerous females n/a n/a

ovigerous females n/a n/a

St. Matthew males 0.000502 3.107158

blue king crab females 0.02065 2.27

non-ovigerous females n/a n/a

ovigerous females n/a n/a

Tanner crab males 0.00027 3.022134

females n/a n/a

non-ovigerous females 0.000562 2.816928

ovigerous females 0.000441 2.898686

Snow crab males 0.000267 3.097253

females n/a n/a

non-ovigerous females 0.001047 2.708367

ovigerous females 0.001158 2.708793

Hair crab males 0.00071731 3.02

females 0.00119453 2.86
37

Table 4. -- Special projects related to crab species conducted on National Marine Fisheries 

Service eastern Bering Sea bottom trawl survey in 2017.

Project title Principle Investigator Agency

Bitter crab syndrome Pam Jensen RACE1-SAP2

Annual vs. biennial snow crab reproductive cycle Jennifer Newby RACE1-SAP2

Spatial variance in shell structure of snow crab Robert Foy RACE1-SAP2

Tanner crab chela height measurements Robert Foy RACE1-SAP2

Live collection of mature snow and Tanner crabs Cliff Ryer RACE1-FBE3

Genetics of mating dynamics in EBS snow crab Tyler Jackson ADF&G4

1 Alaska Fisheries Science Center, Resource Assessment and Conservation Engineering Division, 

Seattle, Washington.

2 AFSC, Resource Assessment and Conservation Engineering Division, Shellfish Assessment 

Program, Kodiak, Alaska.

3 AFSC, Resource Assessment and Conservation Engineering Division, Fisheries Behavioral 

Ecology Program, Newport, Oregon.

4 State of Alaska, Department of Fish and Game.
38

Table 5. -- Summary of 2017 National Marine Fisheries Service eastern Bering Sea bottom trawl 

survey details for seven commercial crab stocks. Male size categories are defined in 

Table 1.

Tows 

in 

District

Tows 

with 

crab

Crab 

measured

Crab 

caught

Biomass 

(t)

CI 

(± 95%)

Bristol Bay District Immature male 136 38 112 112 2,239 780

Red King Crab Mature Male 136 64 266 266 23,102 8,328

Legal 136 60 220 220 20,842 7,703

Immature female 136 27 81 81 1,193 680

Mature female 136 49 574 574 26,424 13,139

Pribilof District Immature male 77 5 6 6 88 98

Red King Crab Mature Male 77 8 57 57 3,658 4,632

Legal 77 8 52 52 3,513 4,500

Immature female 77 0 0 0 0 0

Mature female 77 5 18 18 505 550

Pribilof District Immature male 86 2 4 4 45 68

Blue King Crab Mature Male 86 4 4 4 253 254

Legal 86 3 3 3 223 250

Immature female 86 4 5 5 55 54

Mature female 86 4 10 10 204 237

St. Matthew Is. Immature male 56 4 9 9 122 155

Blue King Crab Mature Male 56 13 39 39 1,721 1,968

Legal 56 10 27 27 1,333 1,482

Immature female 56 2 6 6 61 94

Mature female 56 0 0 0 0 0

Tanner Crab Immature male 120 90 734 734 4,565 1,860

east of 166oW Mature Male 120 81 1,057 1,057 19,387 6,292

Legal 120 76 775 775 15,675 5,221

Immature female 120 34 197 197 158 122

Mature female 120 49 366 366 1,986 769

Tanner Crab Immature male 255 153 2,972 3,798 5,417 1,395

west of 166oW Mature Male 255 107 1,953 1,955 24,268 7,812

Legal 255 101 1,578 1,580 21,288 7,339

Immature female 255 99 2,394 3,812 1,255 493

Mature female 255 69 973 1,383 5,019 3,069

Opilio Tanner Crab Immature male 375 205 12,319 126,576 188,851 59,034

Mature Male 375 168 2,122 2,204 29,363 7,302

Legal 375 197 4,317 5,773 52,272 13,399

Immature female 375 109 4,284 88,444 66,242 24,910

Mature female 375 135 8,201 74,070 103,422 44,445
39

Table 6. -- Time series of biomass estimates (t) for Bristol Bay District red king crab 

(Paralithodes camtschaticus) by size category (CL) and sex from the National Marine 

Fisheries Service eastern Bering Sea bottom trawl surveys. The 95% confidence 

intervals (CI) are 1.96 SE. See authors for 1975-1977 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 120 mm ≥ 120 mm ± CI ≥ 135 mm ± CI

1978 54,371 146,682 66,417 98,241 3,795 141,265 54,370

1979 16,886 86,906 43,304 63,107 5,132 59,165 21,521

1980 37,369 129,829 65,411 106,655 7,594 73,712 46,197

1981 27,294 41,520 12,659 27,368 4,215 59,099 30,597

1982 51,268 23,038 8,656 10,184 21,932 48,913 18,738

1983 25,675 9,796 2,494 2,867 7,257 7,237 2,683

1984 79,710 16,849 8,751 7,623 38,806 17,529 14,374

1985 12,823 14,006 4,130 5,356 1,602 5,723 2,805

1986 12,382 28,189 27,164 13,033 1,847 5,062 2,860

1987 16,626 30,197 14,575 18,167 7,074 15,427 9,677

1988 9,513 25,861 9,178 19,117 1,205 18,019 14,900

1989 7,059 35,503 15,936 27,552 1,322 11,615 7,455

1990 6,344 32,481 14,786 24,527 2,871 17,995 14,579

1991 6,395 60,142 69,981 52,119 1,826 15,553 13,342

1992 6,787 18,327 6,835 13,747 1,088 11,163 5,657

1993 6,939 28,740 12,766 19,839 1,170 16,101 7,849

1994 3,601 19,775 6,740 13,371 1,104 8,283 3,558

1995 6,359 20,939 14,711 15,570 2,992 7,868 3,839

1996 9,067 18,111 7,309 15,073 5,380 12,042 6,829

1997 27,126 32,533 13,321 27,403 3,051 21,365 14,033

1998 13,035 33,297 10,450 19,409 2,161 35,849 17,889

1999 5,093 39,870 16,942 30,005 1,163 19,126 13,276

2000 6,961 31,450 10,638 22,090 2,615 26,387 18,086

2001 8,942 19,060 5,746 15,360 1,692 22,866 13,703

2002 12,113 33,359 12,655 25,241 5,150 19,144 10,306

2003 11,514 63,271 57,913 51,115 5,642 35,587 16,085

2004 27,917 63,159 54,053 53,895 6,162 34,826 18,589

2005 17,036 38,105 14,021 28,373 8,455 42,715 17,805

2006 11,756 39,808 17,766 32,148 6,521 37,005 14,306

2007 14,043 44,115 17,880 34,226 2,257 42,931 19,123

2008 15,840 51,375 35,542 38,155 1,675 44,194 28,234

2009 8,926 34,250 25,727 21,996 760 46,616 30,241

2010 5,441 33,586 16,497 24,891 535 40,951 21,869

2011 7,952 21,990 9,231 16,622 3,515 38,035 19,244

2012 5,841 24,837 13,411 19,858 2,881 27,282 17,713

2013 5,515 34,141 14,164 28,358 547 22,031 15,783

2014 12,621 48,038 17,559 36,130 1,560 50,926 22,953

2015 4,984 32,121 11,019 27,209 838 26,296 15,078

2016 2,077 25,481 7,302 22,424 772 33,370 17,051

2017 2,239 23,102 8,328 20,842 1,193 26,424 13,139
40

Table 7. -- Time series of abundance estimates (in millions) for Bristol Bay District red king crab 

(Paralithodes camtschaticus) by size category (CL) and sex from the National Marine 

Fisheries Service eastern Bering Sea bottom trawl surveys. The 95% confidence 

intervals (CI) are 1.96 SE. See authors for 1975-1977 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 120 mm ≥ 120 mm ± CI ≥ 135 mm ± CI

1978 89.5 67.9 30.7 38.5 27.8 161.3 61.9

1979 33.4 38.0 19.1 23.6 22.1 57.9 20.3

1980 70.8 51.3 25.3 37.5 34.4 87.9 66.4

1981 41.1 18.4 5.4 9.7 13.1 58.4 29.6

1982 110.9 12.0 4.9 4.0 72.4 52.9 21.8

1983 46.2 5.7 1.5 1.3 23.8 8.7 3.6

1984 164.9 9.1 4.7 3.3 109.8 27.4 23.9

1985 16.8 7.6 2.2 2.3 4.3 8.4 4.1

1986 15.2 14.8 14.6 5.6 5.2 6.4 3.6

1987 24.4 14.6 7.0 7.3 17.4 18.5 11.4

1988 11.3 11.6 4. 0 7.5 2.5 20.1 17.0

1989 10.0 15.1 6.5 10.4 3.9 13.2 8.6

1990 9.7 13.7 6.1 8.9 7.8 17.0 13.8

1991 9.7 23.2 26.1 18.5 4.8 14.9 13.8

1992 8.3 7.5 3.0 4.6 2.3 10.2 4.9

1993 8.2 12.5 5.6 7.0 2.8 14.0 7.0

1994 7.1 8.6 2.9 4.8 3.8 6.1 2.5

1995 11.0 9.1 6.9 5.9 6.1 6.3 3.0

1996 17.5 7.2 2.8 5.3 14.3 9.8 5.6

1997 32.6 12.3 4.8 9.2 5.1 21.8 17.1

1998 16.8 15.4 5.0 6.8 6.3 31.7 17.5

1999 11.3 17.4 7.7 11.7 4.1 15.4 10.8

2000 10.7 14.0 4.9 8.4 6.3 21.0 13.6

2001 12.0 7.4 2.2 5.1 4.3 20.9 12.9

2002 22.9 13.6 5.2 8.6 17.6 17.0 9.7

2003 18.8 24.4 19.4 17.1 13.2 28.3 13.2

2004 43.3 23.7 19.8 18.0 19.7 31.7 18.9

2005 31.5 15.6 5.4 9.6 23.6 35.6 15.3

2006 21.2 16.4 7.2 11.8 16.9 31.0 12.2

2007 17.5 18.2 7.1 12.3 4.5 35.8 16.3

2008 17.1 20.9 13.8 12.9 3.7 36.8 24.3

2009 9.6 15.6 11.5 8.3 1.7 35.8 22.4

2010 6.5 14.7 7.0 9.4 1.2 31.5 17.4

2011 37.5 9.3 3.9 6.1 33.0 29.3 15.1

2012 8.0 9.7 4.9 6.7 7.6 19.6 13.2

2013 6.7 12.9 5.3 9.4 1.3 15.6 11.1

2014 15.5 19.7 7.3 12.4 2.8 36.9 17.0

2015 6.7 11.6 4.0 8.7 2.4 18.4 10.6

2016 4.7 9.0 2.6 7.1 3.6 22.4 11.6

2017 3.3 7.7 2.7 6.4 2.5 17.5 8.6
41

Table 8. -- Average bottom water temperatures collected at stations with mature female Bristol 

Bay red king crab (Paralithodes camtschaticus) on the National Marine Fisheries 

Service eastern Bering Sea bottom trawl survey, and the mean ratio of a combination 

of eyed, hatching, and freshly hatched eggs to uneyed embryos in mature red king 

crab females. Bristol Bay stations were sampled twice during the cold years

(highlighted in gray). An * indicates statistical significance within the year using a 

two sample t-test, alpha = 0.95 and P < 0.001.

Sample 

event Average bottom 

temperature (°C)

Standard deviation 

(n = stations)

Two sample 

t-test values

Mean eyed to 

uneyed embryo 

ratio

May 1999 0.1 0.8 (41) t = -11.9 6.68

July 1999 2.5* 0.8 (31) 0.03

May 2000 1.7 0.5 (49) t = -9.2 1.54

July 2000 4.6* 1.6 (23) 0.01

June 2001 3.5 0.3 (40) 0.01

June 2002 3.4 0.6 (52) 0.06

June 2003 4.2 0.4 (51) 0.01

June 2004 3.9 0.5 (61) 0.03

June 2005 4.3 0.5 (49) 0.01

June 2006 2.2 0.7 (69) t = -12.5 0.63

July 2006 4.2* 0.8 (30) 0.01

June 2007 1.8 0.9 (68) t = -7.4 1.05

July 2007 3.4* 1.0 (32) 0.01

June 2008 1.4 0.7 (76) t = -9.5 2.41

July 2008 3.6* 1.1 (32) 0.01

June 2009 1.5 1.6 (73) t = -8.6 0.93

July 2009 4.5* 1.5 (32) 0.01

June 2010 2 0.9 (40) t = -10.9 0.64

July 2010 4.8* 1.0 (23) 0.00

June 2011 2.9 0.8 (46) t = -8.6 0.94

July 2011 5.9* 1.1 (20) 0.06

June 2012 0.9 1.2 (40) t = -8.4 1.89

July 2012 4.0* 1.3 (15) 0.00

June 2013 2.9 1.1 (35) 0.02

June 2014 4.4 0.8 (40) 0.00

June 2015 4.6 0.4 (44) 0.00

June 2016 5.7 0.7 (57) 0.00

June 2017

August 2017

3.18

5.01*

1.02 (51)

1.54 (20) t = -4.9153 1.190.00
42

Table 9. -- Time series of biomass estimates (t) for Pribilof District red king crab (Paralithodes 

camtschaticus) by size category (CL) and sex from National Marine Fisheries Service 

eastern Bering Sea bottom trawl surveys. The 95% confidence intervals (CI) are 

1.96 SE. See authors for 1975-1977 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 120 mm ≥ 120 mm ± CI ≥ 135 mm ± CI

1978 0 1,250 2,022 1,250 0 52 102

1979 0 556 561 488 0 93 182

1980 18 1,269 950 1,269 0 262 374

1981 0 312 358 312 0 35 68

1982 18 1,464 2,002 1,464 14 919 1,402

1983 26 527 551 493 0 309 292

1984 0 317 341 283 0 112 125

1985 0 61 121 61 0 0 0

1986 0 138 188 138 0 79 154

1987 0 54 105 54 31 0 0

1988 713 107 209 44 283 553 940

1989 675 1,529 2,728 871 924 1,327 2,140

1990 7,477 1, 141 2,077 138 522 2,200 3,048

1991 640 4,430 6,913 1,321 66 4,967 5,864

1992 274 3,305 3,864 2,528 278 3,153 5,620

1993 282 9,873 17,834 9,189 7 6,471 9,096

1994 430 9,139 13,748 8,117 47 3,917 6,772

1995 431 18,056 21,267 16,793 315 4,834 6,393

1996 68 2,361 1,720 2,330 31 1,976 2,867

1997 1,510 6,159 7,515 5,940 218 1,744 2,018

1998 416 2,324 1,639 1,778 50 1,669 2,487

1999 3,358 5,523 7,217 4,472 4,117 1,302 1,826

2000 157 4,320 3,164 3,843 8 987 1,214

2001 2,339 8,603 13,262 5,770 406 5,369 10,462

2002 8 7,037 9,461 7,014 12 775 803

2003 0 5,373 6,928 5,275 1 2,268 4,032

2004 152 3,622 4,183 3,622 105 1,187 1,238

2005 55 1,238 1,420 1,238 0 3,118 4,791

2006 109 7,003 5,252 6,696 10 2,173 2,627

2007 214 5,224 5,042 5,007 50 1,760 2,647

2008 332 5,462 5,418 5,102 192 2,825 3,701

2009 44 2,500 3,125 2,127 15 811 841

2010 53 4,405 3,767 3,973 0 840 1,167

2011 44 3,834 4,872 3,751 3 814 1,165

2012 336 4,477 5,031 4,360 0 663 710

2013 104 7,749 9,409 7,567 0 169 194

2014 82 12,047 18,525 11,433 0 1,093 2,015

2015 113 15,173 21,971 14,788 0 3,859 7,270

2016 526 4,150 5,700 3,653 26 1,873 2,241

2017 88 3,658 4,632 3,513 0 505 550
43

Table 10. -- Time series of abundance estimates (in millions) for Pribilof District red king crab 

(Paralithodes camtschaticus) by size category (CL) and sex from National Marine 

Fisheries Service eastern Bering Sea bottom trawl surveys. The 95% confidence 

intervals (CI) are 1.96 SE. See authors for 1975-1978 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 120 mm ≥ 120 mm ± CI ≥ 135 mm ± CI

1979 0.0 0.2 0.2 0.2 0.0 0.1 0.1

1980 0.1 0.4 0.3 0.4 0.0 0.1 0.2

1981 0.0 0.1 0.1 0.1 0.0 0.0 0.0

1982 0.0 0.3 0.4 0.3 0.0 0.5 0.7

1983 0.0 0.1 0.1 0.1 0.0 0.2 0.1

1984 0.0 0.1 0.1 0.1 0.0 0.1 0.1

1985 0.0 0.0 0.0 0.0 0.0 0.0 0.0

1986 0.0 0.0 0.1 0.0 0.0 0.0 0.1

1987 0.0 0.0 0.0 0.0 0.0 0.0 0.0

1988 1.9 0.1 0.1 0.0 1.6 0.4 0.7

1989 1.1 0.8 1.4 0.4 1.8 1.1 1.7

1990 7.1 0.8 1.4 0.1 0.7 2.3 3.0

1991 0.7 2.4 3.8 0.6 0.3 4.3 5.1

1992 0.4 1.5 1.8 1.0 0.4 2.4 4.4

1993 0.3 3.5 6.4 3.1 0.0 4.5 6.4

1994 0.4 3.1 4.7 2.4 0.1 2.4 4.2

1995 0.5 5.2 5.9 4.4 0.3 3.0 3.9

1996 0.1 0.6 0.4 0.5 0.0 1.1 1.6

1997 1.6 1.6 1.7 1.4 0.3 1.0 1.1

1998 0.4 0.8 0.6 0.4 0.1 1.0 1.4

1999 7.2 1.9 2.2 1.3 9.5 0.9 1.1

2000 0.1 1.5 1.2 1.3 0.0 0.7 0.8

2001 2.5 3.7 6.1 1.9 0.6 3.8 7.5

2002 0.0 1.9 2.5 1.9 0.0 0.4 0.4

2003 0.0 1.5 2.0 1.4 0.0 1.2 2.1

2004 1.4 0.8 0.9 0.8 1.1 0.5 0.6

2005 0.1 0.2 0.3 0.2 0.0 1.3 2.0

2006 0.1 1.4 1.1 1.2 0.0 1.0 1.1

2007 0.2 1.2 1.3 1.1 0.1 0.8 1.3

2008 0.4 1.3 1.2 1.1 0.2 1.5 2.1

2009 0.0 0.9 1.2 0.7 0.0 0.3 0.3

2010 0.1 1.4 1.3 1.2 0.0 0.6 0.8

2011 0.0 1.0 1.3 1.0 0.0 0.5 0.6

2012 0.4 1.2 1.5 1.2 0.0 0.4 0.5

2013 0.1 1.7 2.0 1.6 0.0 0.1 0.1

2014 0.1 3.0 4.2 2.6 0.0 0.5 0.9

2015 0.1 3.5 4.9 3.3 0.0 1.8 3.3

2016 0.5 1.3 1.9 1.0 0.04 1.3 1.4

2017 0.1 1.0 1.3 1.0 0.0 0.3 0.3
44

Table 11. -- Time series of biomass estimates (t) for blue king crab (Paralithodes platypus) by 

size category (CL) and sex in the Pribilof District from National Marine Fisheries 

Service eastern Bering Sea bottom trawl surveys. The 95% confidence intervals (CI) 

are 1.96 SE. See authors for 1975-1978 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 120 mm ≥ 120 mm ± CI ≥ 135 mm ± CI

1979 61 10,959 6,775 9,040 92 1,097 1,706

1980 2,084 23,553 19,846 20,679 699 211,604 408,004

1981 1,704 11,628 3,963 10,554 497 5,987 5,507

1982 1,152 7,389 2,712 6,893 553 8,824 11,724

1983 962 5,409 1,882 4,474 258 9,990 15,495

1984 130 2,216 993 1,824 15 3,070 2,292

1985 39 1,055 551 755 5 520 457

1986 4 1,505 893 1,473 11 2,420 4,272

1987 191 2,923 2,357 2,781 119 795 909

1988 170 842 873 842 190 528 508

1989 1,275 827 1,034 827 801 945 1,075

1990 2,004 3,078 3,617 1,514 1,118 1,810 1,803

1991 1,377 4,690 3,544 3,326 343 2,433 1,973

1992 1,801 4,391 3,637 3,035 802 1,848 1,737

1993 1,088 4,556 2,743 3,203 444 1,647 1,489

1994 619 3,410 2,305 2,806 87 4,806 4,207

1995 968 8,360 9,898 6,787 331 3,948 4,017

1996 745 4,641 2,444 3,873 177 5,408 5,318

1997 381 3,233 1,749 2,765 194 2,835 2,386

1998 692 2,798 1,367 2,510 267 1,914 1,654

1999 161 1,729 1,141 1,426 0 2,868 2,625

2000 113 2,091 1,212 1,746 0 1,462 1,319

2001 87 1,599 2,302 1,461 0 1,816 2,571

2002 0 680 674 647 0 1,401 2,129

2003 19 702 550 671 21 1,286 1,880

2004 36 107 122 48 25 98 114

2005 326 344 479 344 477 370 413

2006 87 166 196 139 38 538 801

2007 197 306 479 206 59 223 384

2008 212 46 90 46 222 450 560

2009 254 497 695 187 80 907

2010 92 303 274 190 84 310 401

2011 0 461 763 399 3 34 49

2012 165 644 928 459 9 229 296

2013 15 250 391 190 12 154 211

2014 83 233 320 233 16 91 108

2015 82 622 480 428 0 160 207

2016 70 129 154 68 49 352 340

2017 45 253 254 223 55 204 237
45

Table 12. -- Time series of abundance estimates (in millions) by size category (CL) and sex for 

blue king crab (Paralithodes platypus) in the Pribilof District from National Marine 

Fisheries Service eastern Bering Sea bottom trawl surveys. The 95% confidence 

intervals (CI) are 1.96 SE. See authors for 1975-1978 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 120 mm ≥ 120 mm ± CI ≥ 135 mm ± CI

1979 0.1 4.1 2.6 3.0 0.1 1.2 1.9

1980 2.7 7.8 6.3 6.2 0.8 182.9 350.4

1981 2.1 3.8 1.3 3.2 0.8 5.4 4.7

1982 1.4 2.4 0.8 2.1 0.9 7.8 10.0

1983 1.0 1.9 0.7 1.3 0.5 9.3 14.2

1984 0.5 0.8 0.3 0.6 0.5 2.8 2.1

1985 0.1 0.4 0.2 0.3 0.3 0.5 0.4

1986 0.0 0.5 0.3 0.5 0.0 2.1 3.7

1987 0.6 0.9 0.7 0.8 0.4 0.7 0.8

1988 1.2 0.2 0.2 0.2 0.9 0.5 0.4

1989 3.5 0.2 0.3 0.2 2.6 1.1 1.5

1990 2.4 1.5 1.8 0.6 2.2 2.0 2.2

1991 1.9 2.0 1.4 1.2 0.8 2.8 2.3

1992 2.4 1.9 1.6 1.2 1.8 2.1 2.1

1993 1.5 1.9 1.1 1.1 0.9 1.8 1.6

1994 0.6 1.3 0.9 0.9 0.1 5.0 4.4

1995 1.1 3.1 3.6 2.2 0.7 4.0 4.1

1996 0.7 1.7 0.9 1.3 0.3 5.0 4.8

1997 0.5 1.2 0.7 0.9 0.3 2.6 2.2

1998 0.9 1.0 0.5 0.8 0.5 1.8 1.6

1999 0.2 0.6 0.4 0.5 0.0 2.8 2.6

2000 0.2 0.7 0.4 0.5 0.0 1.4 1.2

2001 0.1 0.5 0.7 0.4 0.0 1.7 2.5

2002 0.0 0.2 0.2 0.2 0.0 1.2 1.9

2003 0.0 0.2 0.2 0.2 0.1 1.1 1.7

2004 0.1 0.0 0.1 0.0 0.1 0.1 0.1

2005 2.0 0.1 0.1 0.1 2.3 0.3 0.3

2006 0.1 0.1 0.1 0.0 0.1 0.4 0.6

2007 0.2 0.1 0.2 0.1 0.1 0.2 0.3

2008 0.2 0.0 0.0 0.0 0.3 0.4 0.6

2009 0.3 0.2 0.4 0.1 0.2 0.5 0.8

2010 0.1 0.1 0.1 0.1 0.2 0.2 0.3

2011 0.0 0.2 0.3 0.1 0.0 0.0 0.0

2012 0.2 0.3 0.4 0.2 0.0 0.3 0.5

2013 0.1 0.1 0.2 0.1 0.0 0.2 0.2

2014 0.1 0.1 0.1 0.1 0.0 0.1 0.1

2015 0.1 0.2 0.2 0.1 0.0 0.2 0.3

2016 0.1 0.1 0.1 0.02 0.1 0.4 0.4

2017 0.1 0.1 0.1 0.1 0.1 0.2 0.3
46

Table 13. -- Time series of biomass estimates (t) for blue king crab (Paralithodes platypus) by 

size category (CL) and sex in the St. Matthew Island Section sampling stratum of the 

Northern District from National Marine Fisheries Service eastern Bering Sea bottom 

trawl surveys. The 95% confidence intervals (CI) are 1.96 SE. See authors for 1978-

1979 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 105 mm ≥ 105 mm ± CI ≥ 120 mm ± CI

1980 2,646 7,826 7,151 4,786 423 737 1,248

1981 527 6,175 4,894 4,715 97 63 71

1982 1,758 14,934 9,259 12,065 416 0 0

1983 1,162 8,834 4,907 6,919 78 1,597 2,183

1984 539 3,737 1,358 3,145 42 216 285

1985 404 2,831 1,208 2,405 95 38 60

1986 252 1,267 971 725 99 13 25

1987 495 2,022 1,130 1,284 205 35 49

1988 702 2,830 1,346 1,880 612 123 147

1989 3,041 4,790 2,344 3,415 1,219 504 448

1990 1,122 5,931 3,073 4,707 336 13 25

1991 1,664 6,073 2,918 4,099 521 270 506

1992 1,250 6,279 2,513 4,608 280 216 250

1993 2,106 8,425 2,685 6,258 643 1,635 3,026

1994 916 5,812 2,008 4,246 99 128 131

1995 1,038 4,889 1,653 3,448 182 21 28

1996 1,291 8,494 4,013 6,218 364 432 770

1997 1,342 10,005 6,471 7,341 287 407 707

1998 902 7,478 5,269 5,487 210 243 261

1999 272 1,423 507 1,163 93 14 28

2000 315 1,880 1,136 1,534 52 37 52

2001 483 2,512 1,254 1,937 145 43 48

2002 119 1,640 1,033 1,371 1 89 120

2003 542 1,233 765 918 94 339 430

2004 443 1,341 754 1,139 194 66 82

2005 449 1,396 987 1,016 93 52 76

2006 1,050 3,223 2,262 2,460 145 14 28

2007 2,618 4,564 3,113 2,217 247 47 47

2008 1,972 3,655 2,059 2,701 214 40 45

2009 1,891 5,079 2,630 2,571 218 192 191

2010 3,974 8,141 5,955 4,317 112 456 856

2011 1,699 9,516 10,167 5,701 122 32 46

2012 907 5,652 3,668 3,313 52 74 64

2013 446 2,022 860 1,485 85 27 38

2014 796 5,472 4,750 3,568 40 62 75

2015 825 5,134 7,656 3,592 5 24 35

2016 509 3,072 2,273 2,305 0 129 104

2017 122 1,721 1,968 1,333 61 0 0
47

Table 14. -- Time series of abundance estimates (in millions) for blue king crab (Paralithodes 

platypus) by size category (CL) and sex in the St. Matthew Island Section sampling 

stratum of the Northern District from National Marine Fisheries Service eastern 

Bering Sea bottom trawl surveys. The 95% confidence intervals (CI) are 1.96 SE.

See authors for 1978-1979 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 105 mm ≥ 105 mm ± CI ≥ 120 mm ± CI

1980 4.2 5.1 5.1 2.5 1.1 1.3 2.2

1981 0.9 3.5 2.5 2.3 0.2 0.1 0.1

1982 3.0 8.3 5.5 5.9 0.9 0.0 0.0

1983 2.0 5.0 2.9 3.3 0.4 2.6 3.5

1984 1.3 1.9 0.7 1.5 0.2 0.3 0.4

1985 0.7 1.5 0.7 1.1 0.3 0.1 0.1

1986 0.6 0.8 0.7 0.4 0.3 0.0 0.0

1987 1.0 1.3 0.8 0.7 0.6 0.1 0.1

1988 1.5 1.8 0.9 1.0 1.6 0.2 0.2

1989 6.2 2.9 1.5 1.8 3.2 1.0 0.8

1990 1.9 3.4 1.8 2.3 0.8 0.0 0.0

1991 3.3 3.9 1.9 2.2 1.4 0.4 0.8

1992 2.2 3.7 1.5 2.3 0.8 0.5 0.5

1993 4.2 5.1 1.7 3.3 1.7 2.3 4.3

1994 1.4 3.6 1.3 2.3 0.2 0.2 0.2

1995 1.7 2.9 1.0 1.7 0.6 0.0 0.1

1996 2.4 5.0 2.5 3.1 1.1 0.7 1.2

1997 2.3 6.0 4.2 3.8 0.8 0.6 1.1

1998 2.1 4.5 3.4 2.8 0.6 0.4 0.4

1999 0.5 0.8 0.3 0.6 0.3 0.0 0.0

2000 0.5 1.0 0.6 0.7 0.1 0.1 0.1

2001 0.8 1.4 0.7 0.9 0.4 0.1 0.1

2002 0.2 0.9 0.5 0.6 0.0 0.1 0.2

2003 1.2 0.7 0.5 0.5 0.3 0.6 0.7

2004 0.9 0.7 0.5 0.6 0.5 0.1 0.1

2005 0.9 0.8 0.6 0.5 0.3 0.1 0.1

2006 1.8 1.9 1.4 1.2 0.3 0.0 0.0

2007 4.5 3.2 2.3 1.2 0.8 0.1 0.1

2008 3.8 2.3 1.3 1.5 0.7 0.1 0.1

2009 3.4 3.6 2.0 1.4 0.6 0.4 0.4

2010 6.2 5.7 4.6 2.5 0.4 1.0 1.9

2011 2.6 6.5 7.2 3.2 0.4 0.1 0.1

2012 1.6 3.8 2.6 1.8 0.2 0.1 0.1

2013 0.8 1.3 0.5 0.8 0.3 0.1 0.1

2014 1.3 3.4 3.4 1.8 0.1 0.1 0.1

2015 1.2 3.2 4.8 2.0 0.0 0.1 0.1

2016 0.8 1.8 1.5 1.2 0.0 0.3 0.2

2017 0.2 1.0 1.2 0.7 0.1 0.0 0.0
48

Table 15. --Time series of biomass estimates (t) for Tanner crab (Chionoecetes bairdi) by size 

category (CW) and sex from National Marine Fisheries Service eastern Bering Sea 

bottom trawl surveys, east of 166° W. The 95% confidence intervals (CI) are 1.96 

SE. See authors for 1975-1978 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 113 mm ≥ 113 mm ± CI ≥ 120 mm ± CI

1979 2,278 15,700 5,632 14,652 591 2,858 2,042

1980 8,433 40,546 25,266 37,082 1,321 11,562 8,541

1981 4,668 18,722 8,004 16,324 893 7,684 4,249

1982 5,518 11,084 3,934 9,415 1,310 6,797 3,505

1983 3,289 10,047 4,708 8,572 913 4,438 2,368

1984 2,522 9,498 4,010 8,376 671 4,129 3,590

1985 1,735 6,495 3,007 5,971 324 2,836 2,350

1986 4,583 5,043 3,078 4,005 1,499 2,006 1,000

1987 17,778 11,085 4,604 9,840 11,912 3,097 1,426

1988 26,460 31,670 29,201 22,482 3,703 19,182 11,150

1989 27,575 60,142 20,624 49,413 6,666 12,309 4,797

1990 23,938 52,942 18,111 47,567 5,990 19,032 8,996

1991 25,932 63,893 40,349 54,968 3,633 27,708 17,830

1992 15,381 74,538 47,450 66,517 346 11,013 4,847

1993 8,056 45,337 17,552 40,826 153 5,171 2,167

1994 3,217 29,086 9,786 26,534 65 5,268 3,096

1995 1,985 17,687 8,332 16,321 250 5,732 3,442

1996 3,435 16,545 10,642 15,562 1,015 5,533 3,885

1997 3,301 5,787 2,014 5,026 967 1,947 857

1998 3,175 5,229 1,580 4,259 550 1,202 492

1999 8,470 6,365 3,007 4,498 1,089 2,272 1,486

2000 5,297 11,131 6,847 8,913 729 2,885 2,197

2001 5,780 10,451 4,498 9,036 2,617 1,314 618

2002 4,359 10,043 4,434 9,030 1,768 1,701 1,106

2003 6,281 10,883 4,939 9,175 705 2,090 940

2004 3,444 9,011 5,060 7,773 267 863 341

2005 5,325 12,118 5,182 10,289 1,673 2,820 2,022

2006 15,136 13,500 5,467 10,921 2,451 4,025 2,318

2007 12,137 15,802 8,749 11,884 696 5,916 4,373

2008 10,424 26,753 28,996 22,447 622 4,457 2,665

2009 3,849 10,937 5,728 8,947 533 4,021 3,045

2010 3,674 10,752 5,420 9,137 795 2,115 1,752

2011 11,865 11,525 6,302 9,814 4,390 2,225 1,174

2012 30,882 14,485 6,790 10,602 5,694 8,550 5,264

2013 25,423 39,157 25,944 23,823 2,344 11,054 7,122

2014 18,262 39,934 12,430 30,404 489 8,159 7,538

2015 7,853 27,241 6,936 22,853 628 4,675 3,126

2016 6,997 18,523 4,755 14,143 50 1,429 850

2017 4,565 19,387 6,292 15,675 158 1,986 769
49

Table 16. -- Time series of abundance estimates (in millions) for Tanner crab (Chionoecetes 

bairdi) by size category (CW) and sex from National Marine Fisheries Service 

eastern Bering Sea bottom trawl surveys, east of 166° W. The 95% confidence 

intervals (CI) are 1.96 SE. See authors for 1975-1978 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 113 mm ≥ 113 mm ± CI ≥ 120 mm ± CI

1979 12.7 20.1 7.0 17.8 7.7 13.0 9.5

1980 40.5 50.4 30.6 43.0 15.6 50.5 37.7

1981 29.2 26.2 11.3 21.0 16.1 35.1 20.4

1982 28.2 16.3 6.0 12.7 14.7 31.2 16.6

1983 38.6 15.2 7.1 12.1 30.2 18.3 10.0

1984 27.4 13.0 5.3 10.6 19.5 16.3 13.1

1985 12.0 8.5 3.7 7.4 5.4 10.8 8.0

1986 50.6 7.3 3.8 5.1 37.5 8.7 3.9

1987 136.0 15.7 5.9 13.0 123.1 13.4 5.5

1988 138.2 49.3 41.4 29.6 56.3 84.4 47.9

1989 243.7 89.5 30.2 66.4 183.1 57.8 22.9

1990 167.4 68.1 22.0 56.7 98.7 101.5 47.2

1991 123.4 90.2 61.3 71.3 41.8 145.9 103.7

1992 54.7 105.7 67.0 88.5 5.1 53.9 23.2

1993 30.0 63.8 25.1 54.2 2.9 24.9 10.8

1994 12.8 39.4 13.4 34.0 2.7 27.0 17.2

1995 10.6 24.0 11.0 21.2 5.6 30.2 18.5

1996 29.3 21.8 13.8 19.8 18.1 28.9 20.4

1997 36.5 7.9 2.6 6.3 34.7 11.1 5.2

1998 24.9 7.8 2.4 5.8 13.4 6.7 2.9

1999 50.1 10.1 4.8 6.1 21.3 12.6 7.8

2000 32.7 16.8 10.0 12.1 16.6 15.0 11.2

2001 118.0 14.5 5.6 11.5 112.2 7.1 3.3

2002 45.8 13.2 5.3 11.0 36.4 10.8 7.9

2003 41.8 14.9 5.8 11.2 13.6 12.0 5.7

2004 18.2 12.4 5.3 9.7 8.6 4.5 2.1

2005 41.9 17.5 6.4 13.5 39.3 16.1 12.1

2006 84.0 20.1 7.7 14.6 29.1 21.9 12.0

2007 52.2 24.7 13.0 16.2 11.5 30.5 21.1

2008 42.1 37.8 36.2 28.7 8.9 24.6 15.2

2009 32.8 16.1 8.1 11.8 23.9 22.1 16.9

2010 39.1 15.3 7.3 11.9 29.7 10.6 8.4

2011 135.2 16.0 7.5 12.4 88.8 12.2 6.2

2012 167.6 22.7 10.7 14.4 65.8 52.4 35.7

2013 110.0 69.6 49.7 37.0 33.2 60.8 42.5

2014 75.5 62.3 19.0 41.9 15.1 44.7 42.0

2015 40.2 40.0 9.4 30.7 14.5 27.6 19.2

2016 24.6 29.6 7.7 20.2 1.4 7.7 4.7

2017 20.6 29.8 9.5 21.8 5.3 10.2 4.0
50

Table 17. -- Time series of biomass estimates (t) for Tanner crab (Chionoecetes bairdi) by size 

category (CW) and sex from National Marine Fisheries Service eastern Bering Sea 

bottom trawl surveys, west of 166° W. The 95% confidence intervals (CI) are 1.96

SE. See authors for 1975-1978 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 103 mm ≥ 103 mm ± CI ≥ 110 mm ± CI

1979 16,462 15,596 6,183 12,913 3,236 16,465 11,111

1980 64,467 39,038 17,099 27,984 12,199 52,221 33,389

1981 29,763 26,777 8,029 18,061 631 34,893 20,587

1982 14,735 34,520 12,749 25,512 410 57,347 32,263

1983 7,761 16,947 6,540 13,195 1,426 15,993 6,928

1984 5,865 12,625 4,735 10,016 1,573 10,785 5,490

1985 2,533 4,143 1,442 3,169 675 2,718 1,636

1986 6,228 5,758 4,123 3,286 1,210 1,360 831

1987 8,047 8,601 3,960 6,994 3,095 2,042 837

1988 19,282 21,812 12,530 17,868 6,484 6,184 3,169

1989 15,988 29,119 12,768 24,883 5,165 7,090 3,186

1990 16,029 39,509 22,820 35,175 3,869 18,663 17,538

1991 17,926 38,059 13,836 34,230 3,390 17,056 7,234

1992 11,419 26,255 11,787 23,410 1,644 15,213 6,889

1993 7,226 12,651 4,912 10,873 913 6,470 2,484

1994 5,070 10, 962 3,745 9,526 1,137 4,579 2,492

1995 3,553 11,757 6,911 10,592 808 6,667 4,052

1996 2,927 7,863 6,170 6,682 424 4,047 3,539

1997 1,986 3,575 1,185 2,873 442 1,451 884

1998 3,041 3,563 1,227 2,602 1,413 1,076 505

1999 4,409 2,311 961 1,679 1,793 1,554 635

2000 4,116 2,787 850 2,003 1,753 1,246 622

2001 8,171 4,918 2,069 3,943 3,741 3,247 1,915

2002 8,691 4,318 1,595 3,029 3,733 2,766 1,375

2003 12,528 8,133 3,789 6,424 3,984 6,313 3,007

2004 13,064 13,404 7,012 9,732 3,866 3,865 1,569

2005 18,964 27,348 10,511 23,655 8,710 8,759 3,745

2006 33,861 39,045 19,584 32,859 10,808 10,914 4,484

2007 35,745 40,540 25,656 31,673 4,944 7,521 2,312

2008 15,705 32,031 17,342 26,351 2,238 7,206 3,191

2009 9,673 22,980 9,143 19,770 2,039 4,456 1,569

2010 8,305 26,296 14,128 23,372 3,008 3,358 1,567

2011 13,198 26,123 17,353 23,259 6,001 3,189 983

2012 19,737 15,027 4,271 11,928 5,982 3,805 1,338

2013 18,417 20,423 9,311 15,939 4,071 6,795 2,393

2014 17,345 33,394 8,146 24,859 2,023 6,705 3,547

2015 8,036 31,122 9,281 27,067 1,038 6,536 4,526

2016 8,196 35,119 8,671 31,252 1,057 6,076 3,664

2017 5,417 24,268 7,812 21,288 1,255 5,019 3,069
51

Table 18. -- Time series of abundance estimates (in millions) for Tanner crab (Chionoecetes 

bairdi) by size category (CW) and sex from National Marine Fisheries Service 

eastern Bering Sea bottom trawl surveys, west of 166° W. The 95% confidence 

intervals (CI) are 1.96 SE. See authors for 1975-1978 data.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female 

Mature 

female 

< 103 mm ≥ 103 mm ± CI ≥ 110 mm ± CI

1979 135.8 28.2 10.9 20.7 49.0 118.3 80.6

1980 476.3 80.0 33.1 49.0 159.2 380.4 259.6

1981 156.1 56.8 16.8 32.3 10.3 268.7 170.6

1982 74.3 71.3 26.1 46.0 15.5 433.1 265.7

1983 108.0 34.6 13.5 24.1 96.5 109.9 48.3

1984 67.2 25.8 9.6 18.5 59.0 70.1 36.8

1985 28.6 8.4 2.9 5.7 21.0 18.6 12.3

1986 49.3 13.5 10.5 6.5 24.1 8.3 4.6

1987 91.0 16.2 6.6 11.6 74.9 12.9 5.3

1988 198.0 39.9 21.1 28.8 129.9 38.1 18.6

1989 156.4 50.2 19.6 38.3 101.9 43.3 19.2

1990 130.0 65.5 35.9 53.4 75.1 107.5 91.6

1991 162.7 65.2 22.5 54.4 84.1 109.2 48.3

1992 101.9 43.2 15.5 35.1 48.6 97.0 43.1

1993 58.1 23.4 8.4 18.4 26.4 42.6 16.4

1994 46.8 20.0 6.4 15.9 34.3 29.2 15.6

1995 32.4 21.3 12.3 18.1 20.6 43.1 25.9

1996 24.3 15.0 11.1 11.7 15.0 26.2 22.3

1997 24.6 7.3 2.3 5.3 22.6 9.0 5.4

1998 49.1 7.4 2.5 4.7 44.7 6.6 3.1

1999 83.4 5.0 2.2 3.2 79.7 10.1 4.0

2000 71.5 6.0 1.8 3.8 57.0 7.3 3.6

2001 145.2 9.8 3.7 7.0 127.2 21.0 11.5

2002 128.8 9.1 3.2 5.5 111.6 19.1 10.9

2003 171.5 16.4 7.2 11.6 123.8 48.5 26.2

2004 207.5 29.2 15.9 18.9 169.9 27.7 13.5

2005 241.1 49.5 17.8 39.2 215.7 60.7 27.9

2006 287.0 72.3 30.4 54.8 178.1 76.4 31.2

2007 279.4 80.2 45.3 55.1 114.3 51.5 16.3

2008 110.8 62.2 29.9 46.2 53.4 48.6 21.8

2009 98.3 42.7 16.6 33.7 71.4 29.2 10.0

2010 114.2 45.7 21.5 37.5 91.6 21.9 10.1

2011 186.6 42.9 22.9 34.8 157.6 20.3 6.0

2012 223.8 28.7 8.1 20.0 122.0 25.6 8.9

2013 183.9 39.7 17.1 27.0 97.2 48.0 17.0

2014 140.4 68.0 17.8 43.8 90.4 43.6 23.7

2015 67.7 57.4 16.5 46.0 36.3 45.4 33.7

2016 75.2 62.2 15.5 51.3 42.1 42.6 27.3

2017 99.0 43.2 12.4 34.9 101.2 35.6 21.4
52

Table 19. -- Time series of biomass estimates (t) for eastern Bering Sea snow crab (Chionoecetes 

opilio) by size category (CW) and sex from National Marine Fisheries Service 

bottom trawl surveys, all Districts combined. The 95% confidence intervals (CI) are 

1.96 SE.

Year Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female*

Mature 

female 

< 95 mm ≥ 95 mm ± CI ≥ 78 mm ± CI*

1980 236,814 99,240 30,937 180,837 27,575 271,682 174,119

1981 166,540 38,042 8,061 97,286 10,988 118,845 40,403

1982 250,475 65,864 19,430 177,794 3,654 141,492 43,943

1983 184,837 68,047 18,468 163,096 3,622 82,182 32,620

1984 119,438 119,971 32,543 183,321 14,119 39,369 15,417

1985 44,214 55,691 12,225 79,334 5,364 5,889 2,487

1986 83,408 58,725 14,454 84,159 26,043 15,174 6,209

1987 266,342 107,536 23,901 178,662 107,989 119,551 44,272

1988 331,332 144,135 53,992 246,515 36,803 165,619 57,314

1989 372,788 143,216 29,275 291,753 23,265 256,728 163,114

1990 306,733 347,750 102,169 521,713 38,213 174,942 72,149

1991 293,255 347,976 105,727 477,618 68,925 199,020 94,676

1992 179,621 166,483 35,962 223,585 49,374 123,479 48,802

1993 273,570 98,857 22,246 143,013 74,921 127,081 41,412

1994 289,633 57,386 12,134 109,683 68,240 122,604 33,649

1995 368,026 61,758 20,003 158,155 31,019 164,959 44,039

1996 341,043 143,856 52,118 312,771 9,274 104,429 31,008

1997 209,131 232,388 57,042 362,928 5,452 101,393 39,142

1998 100,536 164,119 32,216 219,422 13,324 70,183 38,534

1999 44,127 67,352 13,850 87,096 6,160 29,849 13,945

2000 77,782 53,942 16,022 76,830 12,480 93,882 99,120

2001 167,671 56,449 11,370 106,070 17,033 74,840 43,557

2002 83,002 55,907 26,886 100,734 4,388 29,508 18,448

2003 81,606 44,423 10,558 72,396 14,838 38,761 30,847

2004 89,330 44,162 14,554 61,726 30,472 47,743 26,154

2005 184,025 50,072 10,120 105,971 55,125 62,603 27,395

2006 124,579 90,152 61,487 141,960 28,090 50,592 20,186

2007 140,003 99,875 36,249 162,108 27,875 54,449 34,546

2008 114,297 79,600 16,993 123,530 8,994 49,352 22,756

2009 98,468 103,188 30,883 149,588 29,660 50,002 22,623

2010 146,025 105,278 27,471 134,170 90,479 94,956 34,177

2011 149,214 111,662 25,824 145,916 41,232 169,117 63,699

2012 123,683 67,476 18,910 104,438 41,425 143,268 65,922

2013 100,506 58,389 14,779 99,733 31,364 125,672 50,923

2014 140,092 105,441 41,571 151,453 54,523 111,362 46,704

2015 85,434 46,410 14,071 71,550 35,701 81,628 29,256

2016 103,747 29,961 6,869 51,670 53,788 52,022 21,010

2017 188,851 29,363 7,301 52,272 66,242 103,422 44,445

* Differences from previous six reports due to reanalysis of length-weight regression data.
53

Table 20. -- Time series of abundance estimates (in millions) for eastern Bering Sea snow crab 

(Chionoecetes opilio) by size category (CW) and sex from National Marine Fisheries 

Service bottom trawl surveys, all Districts combined. The 95% confidence intervals 

(CI) are 1.96 SE.

Year

Immature 

male 

Mature 

male 

Mature 

male 

Legal 

male 

Immature 

female 

Mature 

female

Mature 

female 

< 95 mm ≥ 95 mm ± CI ≥ 78 mm ± CI

1980 2,567.0 194.8 65.0 513.4 898.5 4,830.3 3,219.6

1981 1,575.4 79.8 17.7 318.8 233.3 2,047.8 713.9

1982 1,779.0 145.3 44.0 591.1 79.9 2,317.2 770.8

1983 1,486.0 150.3 41.2 511.7 240.5 1,466.0 611.0

1984 1,223.6 237.6 62.8 476.1 551.9 670.0 273.8

1985 444.6 105.9 23.3 195.9 213.0 103.4 44.7

1986 1,143.1 110.6 27.0 211.2 842.1 267.4 110.5

1987 3,758.6 215.7 48.8 493.3 2,955.5 2,040.2 768.0

1988 3,677.9 276.9 94.8 683.8 1,045.8 2,795.6 975.4

1989 3,111.0 292.3 60.6 882.5 564.7 4,625.9 3,417.8

1990 2,263.9 710.4 214.0 1,348.1 1,043.9 3,008.7 1,392.7

1991 3,331.8 618.3 179.4 1,093.8 2,270.7 3,545.4 1,930.8

1992 2,776.2 293.2 62.7 512.9 1,862.2 2,068.9 849.0

1993 4,805.5 182.8 41.9 355.8 2,909.2 2,396.3 818.2

1994 4,116.9 106.4 22.2 320.6 2,684.2 2,204.8 552.4

1995 3,635.3 128.0 43.9 515.7 1,021.7 3,109.1 825.9

1996 2,309.8 302.4 105.2 958.6 258.4 2,107.2 680.4

1997 1,204.4 447.1 100.4 945.8 142.9 2,001.0 813.2

1998 778.2 308.4 59.3 514.6 336.0 1,386.7 791.2

1999 422.4 124.9 23.9 198.8 187.6 551.0 270.0

2000 971.1 102.4 31.8 191.1 391.9 1,649.1 1,711.0

2001 1,529.4 111.3 24.1 312.7 470.9 1,243.8 727.5

2002 596.3 114.7 54.8 284.5 121.1 502.8 342.5

2003 1,073.7 88.1 21.3 196.0 542.4 680.2 601.4

2004 1,491.2 79.9 24.2 147.8 1,375.9 931.9 525.2

2005 1,890.3 89.2 17.6 312.5 1,512.2 1,110.9 498.3

2006 1,178.4 171.9 119.4 377.6 765.7 744.3 304.8

2007 1,260.8 196.7 67.0 435.0 620.4 839.6 623.2

2008 1,008.8 154.3 31.6 325.2 395.9 747.7 445.2

2009 1,055.4 195.7 57.9 371.5 1,059.9 747.2 356.6

2010 2,460.5 184.4 45.1 293.7 3,027.6 1,777.8 654.1

2011 1,829.8 194.1 45.7 330.8 1,175.4 3,137.0 1,190.0

2012 1,384.9 123.5 34.3 274.1 1,165.5 2,656.1 1,309.6

2013 1,055.9 112.6 27.6 280.0 1,029.4 2,222.2 994.7

2014 1,527.8 204.2 76.8 385.3 1,590.8 1,815.6 894.7

2015 1,504.2 84.2 22.3 183.8 1,461.0 1,238.6 497.4

2016 2,361.9 57.8 13.2 143.2 2,131.6 818.4 347.2

2017 3,595.4 58.0 14.0 151.9 2,494.8 2,086.9 923.7
54

Table 21. -- Time series of biomass estimates (t) for hair crab (Erimacrus isenbeckii) by size 

category (CL) and sex from National Marine Fisheries Service bottom trawl surveys, 

all Districts combined. The 95% confidence intervals (CI) are 1.96 SE.

Year Sublegal males Legal males Legal males Total female Total female 

< 83 mm ≥ 83 mm ± CI ± CI

1980 988 16,164 11,703 758 1,041

1981 183 10,091 3,658 182 114

1982 182 6,717 3,942 120 70

1983 67 4,231 1,331 296 152

1984 310 3,048 999 106 94

1985 83 2,084 1,041 73 57

1986 207 1,482 787 100 69

1987 355 1,083 607 208 110

1988 631 618 354 168 89

1989 2,955 404 240 43 40

1990 2,540 783 453 255 155

1991 1,393 795 434 230 130

1992 778 591 300 80 53

1993 1,111 2,296 1,588 217 148

1994 1,324 2,413 1,253 194 133

1995 1,396 4,326 2,791 158 84

1996 1,152 3,163 1,738 277 132

1997 584 3,103 1,289 92 56

1998 213 1,984 798 361 241

1999 196 1,735 510 308 125

2000 180 2,873 1,259 331 180

2001 132 1,287 521 565 243

2002 65 1,375 529 101 64

2003 357 659 275 83 49

2004 204 491 191 83 71

2005 328 212 132 273 134

2006 357 661 415 877 954

2007 575 1,278 519 357 168

2008 623 1,346 631 387 174

2009 1,104 1,916 731 464 250

2010 903 1,610 677 469 186

2011 1,752 2,129 935 377 162

2012 3,626 2,878 1,128 534 234

2013 3,357 6,469 2,626 1,055 433

2014 1,144 3,391 1,298 304 139

2015 616 1,338 511 127 74

2016 213 716 307 71 50

2017 208 1,084 364 71 45
55

Table 22. -- Time series of abundance estimates (in millions) for hair crab (Erimacrus isenbeckii) 

by size category (CL) and sex from National Marine Fisheries Service bottom trawl

surveys, all Districts combined. The 95% confidence intervals (CI) are 1.96 SE.

Year

Sublegal males Legal males Legal males Total female Total female 

< 83 mm ≥ 83 mm ± CI ± CI

1980 3.0 20.8 15.2 4.8 7.8

1981 0.5 12.2 4.5 0.5 0.3

1982 0.6 8.4 4.9 0.4 0.2

1983 0.3 5.3 1.7 0.9 0.5

1984 1.1 3.8 1.3 0.4 0.3

1985 0.3 2.5 1.3 0.3 0.2

1986 0.7 1.9 1.0 0.4 0.3

1987 1.6 1.4 0.7 0.9 0.4

1988 3.9 0.8 0.4 0.9 0.7

1989 12.6 0.5 0.3 0.1 0.1

1990 10.1 1.2 0.8 1.0 0.6

1991 4.8 1.3 0.7 1.2 0.7

1992 2.5 1.1 0.6 0.5 0.4

1993 3.8 3.9 2.6 1.3 1.0

1994 5.0 4.0 2.1 1.3 1.1

1995 5.0 6.6 4.3 0.7 0.3

1996 3.6 5.1 2.7 1.0 0.5

1997 1.7 4.6 1.8 0.4 0.2

1998 0.6 2.9 1.1 1.3 0.8

1999 0.6 2.4 0.7 1.2 0.4

2000 0.5 4.1 1.7 1.2 0.7

2001 0.5 1.8 0.7 2.2 1.0

2002 0.3 2.0 0.8 0.5 0.3

2003 1.3 0.9 0.4 0.5 0.3

2004 0.6 0.8 0.3 0.3 0.2

2005 1.0 0.3 0.2 0.8 0.5

2006 1.2 1.0 0.7 3.6 4.6

2007 2.3 1.9 0.7 1.3 0.9

2008 2.3 2.2 1.0 1.4 0.6

2009 3.6 3.1 1.1 1.7 0.9

2010 3.3 2.5 1.0 2.2 1.1

2011 6.9 3.5 1.4 1.6 0.6

2012 11.8 4.6 1.8 2.2 0.8

2013 10.3 10.7 4.6 4.0 1.7

2014 3.3 5.4 2.0 1.0 0.4

2015 1.8 2.1 0.8 0.6 0.3

2016 0.6 1.2 0.5 0.3 0.3

2017 0.6 1.6 0.6 0.3 0.2
56

Figure 1. -- National Marine Fisheries Service eastern Bering Sea bottom trawl survey boundary from 1975 to present indicating four 

major stanzas in total coverage.
57

Figure 2. -- National Marine Fisheries Service eastern Bering Sea standard bottom trawl area surveyed by the FV Alaska Knight 

and the FV Vesteraalen from 4 June to 31 July 2017. Shaded area depicts Bristol Bay resample stations, 10 August to 

15 August 2017.
58

Figure 3. -- Alaska Department of Fish and Game commercial crab management units within the 2017 eastern Bering Sea bottom 

trawl survey area. Grey areas represent stations included in the Pribilof District (dashed line indicates expanded stock 

boundary for blue king crab) and St. Matthew Island Section, Northern District sampling strata and circles represent the 

high-density sampling areas.
59

Figure 4. -- Fixed and average variable net widths (± SD) used to calculate area-swept by National Marine Fisheries Service eastern 

Bering Sea standard bottom trawls from 1975 to the present. 

10.0

11.0

12.0

13.0

14.0

15.0

16.0

17.0

18.0

19.0

20.0

197519801985199019952000200520102015

Mean net width (m)

Average variable net width (m)

Fixed net width (m)
60

Figure 5a. -- Bottom temperatures (°C) measured at stations from the National Marine Fisheries Service eastern Bering Sea bottom 

trawl survey, beginning 4 June 2017 in Bristol Bay and ending on 31 July 2017 at the western edge of the survey. This 

figure does not reflect the 20 stations resampled in Bristol Bay from 10 August to 15 August 2017.
61

Figure 5b. -- Bottom temperatures (°C) measured at the 20 resample stations in Bristol Bay, surveyed from 10 August to 

15 August 2017.
62

Figure 6. -- Average (± 95% CI) bottom (blue) and surface (red) temperatures for Bristol Bay

(standard) stations and the rest of the eastern Bering Sea during the National Marine 

Fisheries Service’s eastern Bering Sea bottom trawl survey. The number of stations 

used to calculate averages was inconsistent among years, particularly as the survey 

boundary expanded from 1975 to 1987. Temperature data in time series does not 

include retow stations in Bristol Bay.
63

Figure 7. -- Historical mature male biomass (t) for six commercial species caught on National Marine Fisheries Service eastern Bering 

Sea bottom trawl surveys.
64

Figure 8. -- Historical mature male abundance (millions, gray area indicates ± 95% CI) for six 

commercial species caught on the National Marine Fisheries Service eastern Bering 

Sea bottom trawl surveys (1975-2017).
65

Figure 9. -- Historical mature male biomass (t, gray area indicates ± 95% CI) for six commercial 

species caught on the National Marine Fisheries Service eastern Bering Sea bottom 

trawl surveys (1975-2017).
66

Figure 10. -- Historical mature female abundance (millions, gray area indicates ± 95% CI) for six 

commercial species caught on the National Marine Fisheries Service eastern Bering 

Sea bottom trawl survey (1975-2017). Abundance was calculated using actual 

maturity (abdominal flap morphology and clutch fullness index) as opposed to the 

size cut-off method used for males. 
67

Figure 11. -- Historical mature female biomass (t, gray area indicates ± 95% CI) for six 

commercial species caught on the National Marine Fisheries Service eastern Bering 

Sea bottom trawl survey (1975-2017). Biomass was calculated using actual 

maturity (abdominal flap morphology and clutch fullness index), as opposed to the 

size cut-off method used for males. 
68

Figure 12. -- Historical abundance (millions, gray area indicates ± 95% CI) of pre-recruit (P1) 

males for six commercial species caught on the National Marine Fisheries Service 

eastern Bering Sea bottom trawl survey (1975-2017).
69

Figure 13a. -- Total density (number nmi-2) of male and female red king crab (Paralithodes camtschaticus) at each station sampled in 

the 2017 Bristol Bay District from standard leg 1 survey (June 2017). Data depicted by circles are equal interval 

densities. Outlined area depicts the management district. 
70

Figure 13b. -- Total density (number nmi-2

) of legal-sized male red king crab (Paralithodes camtschaticus) at each station sampled in 

the 2017 Bristol Bay District from standard leg 1 survey (June 2017). Data depicted by circles are equal interval 

densities, while star represent densities larger than the standard scale. Outlined area depicts the management district.
71

Figure 13c. -- Total density (number nmi-2

) of legal-sized male red king crab (Paralithodes 

camtschaticus) at 20 retow stations in the 2017 Bristol Bay District from standard 

leg 1 survey (June 2017) (top) and from 20 retow stations in August 2017

(bottom). Outlined area depicts the management.
72

Figure 13d. -- Total density (number nmi-2

) of female red king crab (Paralithodes camtschaticus) at 20 retow stations in August 2017

Data depicted by circles are equal interval densities. Outlined area depicts the management district. 
73

Figure 14a. -- Percentage of male and female red king crab (Paralithodes camtschaticus) maturity classes caught at each station 

sampled in the 2017 Bristol Bay District from standard leg 1 stations. Outlined area depicts the management.
74

Figure 14b. -- Percentage of female red king crab (Paralithodes camtschaticus) maturity classes caught at 20 retow stations in August 

2017. Outlined area depicts the management.
75

Figure 15a. -- Percent frequency of occurrence of mature male red king crab (Paralithodes camtschaticus) at standard survey stations 

sampled in the 2017 Bristol Bay District. Outlined area depicts the management district. 
76

Figure 15b. -- Percent frequency of occurrence of mature male red king crab (Paralithodes camtschaticus) at stations sampled during 

standard survey (June 2017) in Bristol Bay District. The 20 stations were retowed in August 2017.
77

Figure 15c. -- Percent frequency of occurrence of mature male red king crab (Paralithodes camtschaticus) at stations sampled during 

retow of 20 Bristol Bay District stations (August 2017).
78

Figure 16. -- Size frequency by shell condition of Bristol Bay District male red king crab 

(Paralithodes camtschaticus) by 5 mm length classes, 2012-2017.
79

Figure 17a. -- Distribution of legal-sized male red king crab (Paralithodes camtschaticus) caught at each station in the 2017 Bristol 

Bay District distinguished by shell condition. The outlined area depicts management district.
80

Figure 17b. -- Distribution of legal-sized male red king crab (Paralithodes camtschaticus), by shell condition, which were sampled

during the standard survey (June 2017) at the 20 Bristol Bay District stations that were subsequently retowed in August 

2017. 
81

Figure 17c. -- Distribution of legal-sized male red king crab (Paralithodes camtschaticus) caught at each station sampled during the

retow of 20 Bristol Bay District stations (August 2017), distinguished by shell condition.
82

Figure 18a. -- Distribution and egg condition of female red king crab (Paralithodes camtschaticus) caught at each station in Bristol 

Bay District during standard survey (June 2017). The outlined area depicts management district.
83

Figure 18b. -- Distribution and egg condition of female red king crab (Paralithodes camtschaticus) at 20 retow stations in August 

2017. The outlined area depicts management district.
84

Figure 19. -- Time series of mature male (≥120 mm CL) and female (actual maturity) Bristol Bay 

District red king crab (Paralithodes camtschaticus) by shell condition, 1975-2017. 

New- Hard = shell condition 2; Old = shell condition 3; Very Old = shell condition 

4 and 5 combined. Mature male data is from leg 1 standard stations, mature female 

data is from 20 retow stations in August 2017.
85

Figure 20a. -- Size frequency by shell condition, egg condition, and clutch fullness of Bristol Bay 

District female red king crab (Paralithodes camtschaticus) by 5 mm length 

classes. Data includes 2017 standard leg 1 stations, with superseded retow stations 

from August 2017.
86

Figure 20b. -- Size frequency by shell condition, egg condition, and clutch fullness of Bristol 

Bay District female red king crab (Paralithodes camtschaticus) by 5 mm length 

classes. Data is from 20 standard survey stations (Leg 1, June 2017). 
87

Figure 20c. -- Size frequency by shell condition, egg condition, and clutch fullness of Bristol Bay 

District female red king crab (Paralithodes camtschaticus) by 5 mm length 

classes. Data is from 20 retow stations (Leg 4, August 2017). 

.
88

Figure 21. -- Centers of stock distribution of Bristol Bay District mature male and female red 

king crab (Paralithodes camtschaticus) from 1975 to 2017. Female data from 

standard leg 1 stations (June 2017).
89

Figure 22. -- Historical size frequency by 5 mm length classes of Bristol Bay District male red 

king crab (Paralithodes camtschaticus), 1975 to 2017.
90

Figure 23. -- Historical size frequency by 5 mm length classes of Bristol Bay District female red 

king crab (Paralithodes camtschaticus), 1975 to 2017. Data from standard leg 1 and 

20 retow stations. The 20 retow stations (August 2017) overlay the original 20 

standard stations (June 2017).
91

Figure 24a. -- Total density (number nmi-2) of red king crab (Paralithodes camtschaticus) at each station sampled in the Pribilof 

District in 2017. Data depicted by circles are equal interval densities, while star represent densities larger than the 

standard scale. The outlined area depicts stations within the management district.

St. Paul Is.

St. George Is.
92

Figure 24b. -- Total density (number nmi-2) of legal-sized male red king crab (Paralithodes camtschaticus) at each station sampled in 

the Pribilof District in 2017. Data depicted by circles are equal interval densities, while diamond and star represent 

densities larger than the standard scale. The outlined area depicts stations within the management district.
93

Figure 25. -- Percentage of male and female red king crab (Paralithodes camtschaticus) maturity classes at each station of the Pribilof 

District in 2017. The outlined area depicts stations within the management district.

St. Paul Is.

St. George Is.
94

Figure 26. -- Percent frequency of occurrence of mature male red king crab (Paralithodes camtschaticus) at stations sampled in the 

2017 Pribilof District.

St. Paul Is.

St. George Is.
95

Figure 27. -- Size frequency by shell condition of Pribilof District male red king crab 

(Paralithodes camtschaticus) by 5 mm length classes, 2012-2017.
96

Figure 28. -- Distribution of legal-sized male red king crab (Paralithodes camtschaticus) caught at each station of the Pribilof District 

in 2017 and distinguished by shell condition. The outlined area depicts stations within the management district.

St. Paul Is.

St. George Is.
97

Figure 29. -- Size frequency by shell condition, egg condition, and clutch fullness of Pribilof 

District female red king crab (Paralithodes camtschaticus) by 5 mm length classes 

in 2017.
98

Figure 30. -- Centers of stock distribution of Pribilof Islands mature male and female red king 

crab (Paralithodes camtschaticus) from 1975 to 2017.
99

Figure 31. -- Size frequency by 5 mm length classes of Pribilof Islands male red king crab 

(Paralithodes camtschaticus) from 1975 to 2017.
100

Figure 32. -- Size frequency by 5 mm length classes of Pribilof Islands female red king crab 

(Paralithodes camtschaticus) from 1975 to 2017.
101

Figure 33a. -- Total density (number nmi-2) of blue king crab (Paralithodes platypus) at each station sampled in the Pribilof District in 

2017. Data depicted by circles are equal interval densities, while star represent densities larger than the standard scale. 

The outlined area depicts the management district as defined by ADF&G.

 

St. Paul Is.

St. George Is.
102

Figure 33b. -- Total density (number nmi-2) of legal-sized male blue king crab (Paralithodes platypus) at each station sampled in the 

Pribilof District in 2017. Data depicted by circles are equal interval densities. The outlined area depicts the management 

district as defined by ADF&G. 
103

Figure 34. -- Percentage of male and female blue king crab (Paralithodes platypus) maturity categories at each station of the Pribilof 

District in 2017. The outlined area depicts the management district as defined by ADF&G.

St. Paul Is.

St. George Is.
104

Figure 35. -- Percent frequency of occurrence of mature male blue king crab (Paralithodes platypus) at Pribilof District stations 

sampled in 2017. The outlined area depicts the management district as defined by ADF&G. 

St. Paul Is.

St. George Is.
105

Figure 36. -- Size frequency by shell condition of Pribilof District male blue king crab 

(Paralithodes platypus) by 5 mm length classes, 2012-2017.
106

Figure 37. -- Distribution of legal-sized male blue king crab (Paralithodes platypus) caught at each station of the Pribilof District in 

2017 distinguished by shell condition. The outlined area depicts the management district as defined by ADF&G. 

St. Paul Is.

St. George Is.
107

Figure 38. -- Size frequency by shell condition, egg condition, and clutch fullness of Pribilof 

District female blue king crab (Paralithodes platypus) by 5 mm length classes in

2017.
108

Figure 39. -- Centers of stock distribution of Pribilof Islands mature male and female blue king 

crab (Paralithodes platypus) from 1975 to 2017.
109

Figure 40. -- Size frequency by 5 mm length classes of Pribilof Islands male blue king crab 

(Paralithodes platypus) from 1975 to 2017.
110

Figure 41. -- Size frequency by 5 mm length classes of Pribilof Islands female blue king crab 

(Paralithodes platypus) from 1975 to 2017.
111

Figure 42a. -- Total density (number nmi-2) of blue king crab (Paralithodes platypus) at each station sampled in the St. Matthew Island 

Section of the Northern District in 2017. Data depicted by circles are equal interval densities, while stars are densities 

larger than the standard scale. The outlined area depicts stations within the St. Matthew Island Section sampling strata.
112

Figure 42b. -- Total density (number nmi-2) of legal-sized male blue king crab (Paralithodes platypus) at each station sampled in the 

St. Matthew Island Section of the Northern District in 2017. Data depicted by circles are equal interval densities, while 

stars are densities larger than the standard scale. The outlined area depicts stations within the St. Matthew Island Section 

sampling strata.
113

Figure 43. -- Percentage of male and female blue king crab (Paralithodes platypus) maturity categories at each station of the St. 

Matthew Island Section of the Northern District in 2017. The outlined area depicts stations within the St. Matthew Island 

Section sampling strata.

St. Matthew Is.
114

Figure 44. -- Percent frequency of occurrence of mature male blue king crab (Paralithodes platypus) at stations in the 2017 St. 

Matthew Island Section sampling strata of the Northern District.

St. Matthew Is.
115

Figure 45. -- Size frequency by shell condition of St. Matthew Island Section male blue king crab 

(Paralithodes platypus) by 5 mm length classes, 2012-2017.
116

Figure 46. -- Distribution of legal-sized male blue king crab (Paralithodes platypus) caught at each station of the St. Matthew Island 

Section of the Northern District in 2017 and distinguished by shell condition. The outlined area depicts stations within 

the St. Matthew Island Section sampling strata.

St. Matthew Is.
117

Figure 47. -- Size frequency by shell condition, egg condition, and clutch size of St. Matthew 

Island Section female blue king crab (Paralithodes platypus) by 5 mm length 

classes in 2017.
118

Figure 48. -- Centers of stock distribution of St. Matthew Island mature male and female blue 

king crab (Paralithodes platypus) from 1975 to 2017. Note that no mature female 

crabs were caught in 2017.
119

Figure 49. -- Size frequency by 5 mm length classes of St. Matthew Island Section male blue

king crab (Paralithodes platypus) from 1976 to 2017.
120

Figure 50. -- Size frequency by 5 mm length classes of St. Matthew Island Section female blue

king crab (Paralithodes platypus) from 1976 to 2017.
121

Figure 51a. -- Total density (number nmi-2

) of Tanner crab (Chionoecetes bairdi) at each station sampled in 2017.
122

Figure 51b. -- Total density (number nmi-2) of legal-sized male Tanner crab (Chionoecetes bairdi) at each station sampled in 2017.
123

Figure 52. -- Percentage of male and female Tanner crab (Chionoecetes bairdi) maturity categories at each station sampled in 2017.
124

Figure 53. -- Percent frequency of occurrence of mature male Tanner crab (Chionoecetes bairdi) at stations sampled in 2017.
125

Figure 54. -- Male Tanner crab (Chionoecetes bairdi) chela height versus carapace width 

measurements collected on the 2008, 2010, 2012, 2014, 2016, and 2017 (all years 

combined, n = 10,465) National Marine Fisheries Service eastern Bering Sea 

bottom trawl surveys.
126

Figure 55. -- Size frequency by shell condition of male Tanner crab (Chionoecetes bairdi) east of 

166° W by 5 mm width classes of all districts combined, 2012-2017.
127

Figure 56. -- Size frequency by shell condition of male Tanner crab (Chionoecetes bairdi) west of 

166° W by 5 mm width classes of all districts combined, 2012-2017.
128

Figure 57. -- Distribution of legal-sized male Tanner crab (Chionoecetes bairdi) caught at each station in 2017 and distinguished by 

shell condition. Tanner male crab ≥ 120 mm and ≥ 110 mm CW are the legal-size categories for east and west of 166° W, 

respectively.
129

Figure 58. -- Size frequency by shell condition, egg condition, and clutch fullness of female 

Tanner crab (Chionoecetes bairdi) east of 166° W by 5 mm width classes for all 

districts combined in 2017.
130

Figure 59. -- Size frequency by shell condition, egg condition, and clutch fullness of female 

Tanner crab (Chionoecetes bairdi) west of 166° W by 5 mm width classes for all 

districts combined in 2017.
131

Figure 60. -- Time series of mature male (≥ 113 mm CW) and female (actual maturity) Tanner 

crab (Chionoecetes bairdi) east of 166° W by shell condition, 1975-2017. NewHard = shell condition 2; Old = shell condition 3; Very Old = shell condition 4 and 

5 combined.
132

Figure 61. -- Time series of mature male (≥ 103 mm CW) and female (actual maturity) Tanner 

crab (Chionoecetes bairdi) west of 166° W by shell condition, 1975-2017. NewHard = shell condition 2; Old = shell condition 3; Very Old = shell condition 4 and 

5 combined.
133

Figure 62. -- Centers of stock distribution of mature male and female Tanner crab (Chionoecetes 

bairdi) from 1975 to 2017.
134

Figure 63. -- Historical size frequency by 5 mm width classes of male Tanner crab (Chionoecetes 

bairdi) east of 166°W, 1975 to 2017.
135

Figure 64. -- Historical size frequency by 5 mm width classes of female Tanner crab 

(Chionoecetes bairdi) east of 166°W, 1975 to 2017.
136

Figure 65. -- Historical size frequency by 5 mm width classes of male Tanner crab (Chionoecetes 

bairdi) west of 166°W, 1975 to 2017.
137

Figure 66. -- Historical size frequency by 5 mm width classes of female Tanner crab 

(Chionoecetes bairdi) west of 166°W, 1975 to 2017.
138

Figure 67a. -- Total density (number nmi-2) of snow crab (Chionoecetes opilio) at each station sampled in 2017. Data depicted by 

circles are equal interval densities.
139

Figure 67b. -- Total density (number nmi-2) of legal-sized male snow crab (Chionoecetes opilio) at each station sampled in 2017. Data 

depicted by circles are equal interval densities, while stars are densities larger than the standard scale.
140

Figure 68. -- Percentage of male and female snow crab (Chionoecetes opilio) maturity categories at each station sampled in 2017. 
141

Figure 69. -- Percent frequency of occurrence of mature male snow crab (Chionoecetes opilio) at stations sampled in 2017.
142

Figure 70. -- Male snow crab (Chionoecetes opilio) chela height versus carapace width 

measurements collected during the 2009 (n = 1,303), 2011 (n = 1,130), 2013

(n = 943), 2015 (n = 1,008), and 2017 (n=3,328) National Marine Fisheries Service 

eastern Bering Sea bottom trawl surveys.
143

Figure 71. -- Size frequency by shell condition of male snow crab (Chionoecetes opilio) by 5 mm 

width classes of all districts combined, 2012-2017.
144

Figure 72. -- Distribution of legal-sized male snow crab (Chionoecetes opilio) caught at each station in 2017 and distinguished by 

shell condition.
145

Figure 73. -- Size frequency by shell condition, egg condition, and clutch fullness of female 

snow crab (Chionoecetes opilio) by 5 mm width classes of all districts combined in 

2017.
146

Figure 74. -- Time series of mature male (≥ 95 mm CW) and female (actual maturity) snow crab 

(Chionoecetes opilio) by shell condition, 1980-2017. New- Hard = shell condition 

2; Old = shell condition 3; Very Old = shell condition 4 and 5 combined.
147

 

Figure 75. -- Centers of stock distribution of mature male and female snow crab (Chionoecetes 

opilio) from 1975 to 2017.
148

Figure 76. -- Historical size frequency by 5 mm width classes of male snow crab (Chionoecetes 

opilio), 1980 to 2017.
149

Figure 77. -- Historical size frequency by 5 mm width classes of female snow crab (Chionoecetes 

opilio), 1980 to 2017.
150

Figure 78a. -- Total density (number nmi-2

) of Chionoecetes spp. hybrid crab at each station sampled in 2017. Data depicted by circles 

are crab densities at equal intervals. 
151

Figure 78b. -- Total density (number nmi-2) of legal-sized male Chionoecetes spp hybrid crab at each station sampled in 2017. Data 

depicted by circles are crab densities at equal intervals.
152

Figure 79a. -- Percentage of male and female Chionoecetes spp. hybrid crab size and maturity categories at each station sampled in 

2017.
153

Figure 79b. -- Percentage of legal-sized male Chionoecetes spp. hybrid crab size and maturity categories at each station sampled in 

2017.
154

Figure 80. -- Total density (number nmi-2

) and percentage of male and female red king crab (Paralithodes camtschaticus) maturity 

categories at each station sampled in the Northern District in 2017. The Northern District is an ADF&G commercial crab 

management unit in the northern section of the eastern Bering Sea, see inset.
155

Figure 81. -- Total density (number nmi-2

) and percentage of male and female blue king crab (Paralithodes platypus) size and maturity 

categories at stations sampled outside of the Pribilof District and St. Matthew Island section of the Northern District in 

2017. The Northern District is an ADF&G commercial crab management unit in the northern section of the eastern 

Bering Sea, see inset. Note no catch.
156

Figure 82. -- Total density (number nmi-2) and percentage of male and female hair crab (Erimacrus isenbeckii) size categories at each 

station sampled in 2017.
157

Figure 83a. -- National Marine Fisheries Service Bering Sea northern Bering Sea bottom trawl area surveyed by the FV Alaska Knight 

and the FV Vesteraalen from 1 August to 2 September 2017.
158

Figure 83b. -- National Marine Fisheries Service eastern Bering Sea and northern Bering Sea bottom trawl area surveyed by the FV 

Alaska Knight and the FV Vesteraalen from 4 June to 2 September 2017.
159

Figure 84a. -- Bottom temperatures (°C) measured at stations from the National Marine Fisheries Service northern Bering Sea bottom 

trawl survey, beginning 1 August to 2 September 2017.
160

Figure 84b. -- Bottom temperatures (°C) measured at stations from the National Marine Fisheries Service eastern Bering Sea and 

northern Bering Sea bottom trawl area surveyed by the FV Alaska Knight and the FV Vesteraalen from 4 June to 

2 September 2017. This figure does not reflect the 20 stations resampled in Bristol Bay from 10 August to 15 August 

2017.
161

Figure 85. -- Total density (number nmi-2

) of northern Bering Sea red king crab (Paralithodes camtschaticus) at each station sampled 

in 2017. Data depicted by circles are crab densities at equal intervals.
162

Figure 86. -- Percentage of male and female red king crab (Paralithodes camtschaticus) maturity categories at each station sampled in 

the northern Bering Sea in 2017.
163

Figure 87. -- Total density (number nmi-2) of eastern Bering Sea and northern Bering Sea red king crab (Paralithodes camtschaticus)

at each station sampled in 2017. Data depicted by circles are crab densities at equal intervals. Bristol Bay data from 

standard leg 1 and 20 retow stations. The 20 retow stations (August 2017) overlay the original 20 standard stations (June 

2017).
164

Figure 88. -- Percentage of male and female red king crab (Paralithodes camtschaticus) maturity categories at each station sampled in 

the eastern Bering Sea and northern Bering Sea in 2017. Bristol Bay data from standard leg 1 and 20 retow stations. The 

20 retow stations (August 2017) overlay the original 20 standard stations (June 2017).
165

Figure 89. -- Distribution of legal-sized male red king crab (Paralithodes camtschaticus) caught at each station in the northern Bering 

Sea in 2017 and distinguished by shell condition.
166

Figure 90. – Size frequency by shell condition, egg condition, and clutch fullness of Norton 

Sound female red king crab (Paralithodes camtschaticus) by 5 mm length classes in 

the northern Bering Sea in 2017.
167

Figure 91. -- Total density (number nmi-2) of northern Bering Sea blue king crab (Paralithodes platypus) at each station sampled in 

2017. Data depicted by circles are crab densities at equal intervals, while stars are densities larger than the standard scale.
168

Figure 92. -- Percentage of male and female blue king crab (Paralithodes platypus) maturity categories at each station sampled in the 

northern Bering Sea in 2017.
169

Figure 93. -- Total density (number nmi-2

) of eastern Bering Sea and northern Bering Sea blue king crab (Paralithodes platypus) at 

each station sampled in 2017. Data depicted by circles are crab densities at equal intervals, while stars are densities larger 

than the standard scale.
170

Figure 94. -- Percentage of male and female blue king crab (Paralithodes platypus) maturity categories at each station sampled in the 

eastern Bering Sea and northern Bering Sea in 2017.
171

Figure 95. -- Distribution of legal-sized male blue king crab (Paralithodes platypus) caught at each station in the northern Bering Sea 

in 2017 and distinguished by shell condition.
172

Figure 96. – Size frequency by shell condition, egg condition, and clutch fullness of female blue 

king crab (Paralithodes platypus) by 5 mm length classes in the northern Bering 

Sea in 2017.
173

Figure 97. -- Total density (number nmi-2

) of northern Bering Sea snow crab (Chionoecetes opilio) at each station sampled in 2017. 

Data depicted by circles are crab densities at equal intervals, while stars are densities larger than the standard scale.
174

Figure 98. -- Percentage of male and female snow crab (Chionoecetes opilio) maturity categories at each station sampled in the 

northern Bering Sea in 2017.
175

Figure 99. -- Total density (number nmi-2

) of eastern Bering Sea and northern Bering Sea snow crab (Chionoecetes opilio) at each 

station sampled in 2017. Data depicted by circles are crab densities at equal intervals, while stars are densities larger than 

the standard scale.
176

Figure 100. -- Percentage of male and female snow crab (Chionoecetes opilio) maturity categories at each station sampled in the 

eastern Bering Sea and northern Bering Sea in 2017.
177

Figure 101. --Size frequency by shell condition, egg condition, and clutch fullness of female 

snow crab (Chionoecetes opilio) by 5 mm length classes in the northern Bering Sea 

in 2017.
178

Figure 102. -- Output of northern Bering Sea male snow crab (Chionoecetes opilio) regression models to determine male maturity 

based on carapace width and chela height; a.) fitted regression lines, b.) 95%confidence bands, c.) 95% prediction 

bands, d.) maturity cutline with cutoff (vertical line) at 30 mm CW (LN(CW) = 3.401197), which is defined as the 

minimum acceptable maturity size. 
179

Figure 103. -- Sigmoid plot depicting 50% maturity for northern Bering Sea male snow crab (Chionoecetes opilio) by 10 mm size 

bins. Fifty percent maturity (horizontal line) is achieved at 68.36 mm cw (vertical line).
180

Figure 104. -- Total density (number nmi-2

) of northern Bering Sea hair crab (Erimacrus isenbeckii) at each station sampled in 2017. 

Data depicted by circles are crab densities at equal intervals, while stars are densities larger than the standard scale.
181

Figure 105. -- Percentage of male and female hair crab (Erimacrus isenbeckii) maturity categories at each station sampled in the 

northern Bering Sea in 2017.
182

Figure 106. -- Total density (number nmi-2

) of eastern Bering Sea and northern Bering Sea hair crab (Erimacrus isenbeckii) at each 

station sampled in 2017. Data depicted by circles are crab densities at equal intervals, while stars are densities larger 

than the standard scale.
183

Figure 107. -- Total density (number nmi-2) and percentage of male and female hair crab (Erimacrus isenbeckii) maturity categories at 

each station sampled in the eastern Bering Sea and northern Bering Sea in 2017.
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

184

Station A-02 A-03 A-04 A-05 A-06 B-01 B-02 B-03 B-04 B-05 B-06

Start Date 6/27/2017 6/26/2017 6/23/2017 6/23/2017 6/23/2017 6/30/2017 6/27/2017 6/26/2017 6/23/2017 6/24/2017 6/23/2017

Duration (hour) 0.52 0.5 0.52 0.55 0.52 0.51 0.52 0.53 0.52 0.53 0.52

Distance Fished (km) 2.86 2.75 2.83 2.82 2.92 2.74 2.77 2.85 2.82 2.91 2.91

Mid-Latitude (oN) 55.01117 55.00845 55.00719 54.98814 55.02 55.33971 55.33906 55.3414 55.33237 55.33482 55.34313

Mid-Longitude (oW) -166.94968 -166.31214 -165.74993 -165.14797 -164.59 -167.55911 -166.97023 -166.33822 -165.79166 -165.1572 -164.56089

Bottom Depth (m) 156 142 129 110 62 147 141 131 120 112 102

Bottom Temperature (oC) 4.3 4.3 4.3 4.8 5.7 4.3 4.4 4.4 4.4 4.7 4.8

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 15,678 7,341 2,627 507 0 7,852 2,089 1,155 3,955 850 543

 Mature males 1,430 2,515 525 434 0 714 799 243 1,084 1,243 1,019

 Legal 715 1,699 394 290 0 357 614 182 447 1,112 747

 Immature females 13,450 3,137 3,021 72 0 12,919 2,642 1,946 2,679 654 68

 Mature females 18,830 14,903 328 72 0 2,213 2,519 122 2,998 131 68

 Total weight (kg) 68.79 74.48 8.01 4.98 0.00 16.42 14.94 3.33 26.8 14.12 11.18

Opilio Tanner Crab

 Immature males 130 0 0 0 0 0 0 0 0 0 0

 Mature males 0 68 0 0 0 71 61 61 0 0 0

 Legal 65 68 0 0 0 71 61 61 0 0 0

 Immature females 65 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.47 0.61 0.00 0.00 0.00 0.53 0.7 0.56 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 65 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 184 0 128 0 0

 Immature females 0 0 0 0 0 0 184 0 128 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.36 0.00 0.00 0.00 0.00 0.00 2.00 0.13 1.53 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

185

Station B-07 B-08 C-01 C-02 C-03 C-04 C-05 C-06 C-07 C-08 C-09

Start Date 6/18/2017 6/19/2017 6/30/2017 6/27/2017 6/26/2017 6/23/2017 6/24/2017 6/20/2017 6/18/2017 6/19/2017 6/10/2017

Duration (hour) 0.52 0.47 0.52 0.51 0.54 0.53 0.51 0.53 0.53 0.52 0.52

Distance Fished (km) 2.83 2.44 2.94 2.75 2.96 2.84 2.74 2.86 2.91 2.9 2.82

Mid-Latitude (oN) 55.33206 55.34074 55.6643 55.67909 55.66727 55.66107 55.66797 55.67 55.70059 55.66789 55.67052

Mid-Longitude (oW) -164.03076 -163.42092 -167.58255 -166.98401 -166.38339 -165.80184 -165.17467 -164.59 -164.01577 -163.41562 -162.83091

Bottom Depth (m) 78 54 135 135 127 118 109 96 94 82 53

Bottom Temperature (oC) 4.7 3.3 4.5 4.3 4.2 4.5 4.2 3.1 2.4 2.3 3

Red King Crab

 Immature males 0 178 0 0 0 0 0 0 0 0 221

 Mature males 0 444 0 0 0 0 0 0 0 68 294

 Legal 0 355 0 0 0 0 0 0 0 68 221

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 1,155 0 0 0 0 0 0 0 68 1,914

 Total weight (kg) 0.00 31.88 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6.74 40.55

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 800 721 390 887 801 479 0 592 1,505 9,715

 Mature males 217 1,244 262 130 946 308 1,164 0 724 3,625 7,875

 Legal 217 800 131 0 710 185 1,027 0 658 2,530 5,667

 Immature females 0 267 1,180 585 828 678 0 0 132 0 957

 Mature females 0 89 66 65 2,661 308 137 0 132 205 1,546

 Total weight (kg) 2.12 10.69 3.31 1.15 17.29 5.28 15.15 0.00 11.92 40.43 79.61

Opilio Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 197 0 0

 Legal 0 0 0 0 0 0 0 0 197 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 62 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 1.85 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 68 0

 Mature males 0 0 0 0 177 123 0 0 0 205 0

 Immature females 0 0 0 0 177 123 0 0 0 274 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 1.92 1.64 0.00 0.00 0.00 1.76 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

186

Station C-18 D-01 D-02 D-03 D-04 D-05 D-06 D-07 D-08 D-09 D-10

Start Date 7/1/2017 6/30/2017 6/27/2017 6/26/2017 6/23/2017 6/24/2017 6/20/2017 6/18/2017 6/19/2017 6/10/2017 6/7/2017

Duration (hour) 0.52 0.52 0.52 0.51 0.54 0.53 0.58 0.54 0.52 0.53 0.51

Distance Fished (km) 2.92 2.74 2.79 2.74 2.93 2.97 3.15 2.9 2.93 2.79 2.8

Mid-Latitude (oN) 55.66886 56.00069 56.00461 56.00073 56.0021 56.00112 55.99036 55.99889 55.99506 55.98908 55.99764

Mid-Longitude (oW) -168.18569 -167.62366 -167.01308 -166.39943 -165.78438 -165.1893 -164.58648 -164.03229 -163.41443 -162.8133 -162.24541

Bottom Depth (m) 135 133 134 125 108 96 92 91 87 80 71

Bottom Temperature (oC) 4.4 4.4 4.2 4.3 3.9 2.4 2.5 1.9 1.9 2 2.9

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 209 72

 Mature males 0 0 0 0 0 0 62 0 0 279 145

 Legal 0 0 0 0 0 0 62 0 0 279 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 1,254 289

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 2.40 0.00 0.00 33.88 10.78

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 6,069 557 1,976 1,600 1,594 514 62 67 731 348 362

 Mature males 136 70 1,976 867 1,663 1,093 2,994 1,076 2,857 1,045 434

 Legal 0 70 1,185 667 970 772 2,745 807 2,392 975 289

 Immature females 10,092 70 724 1,333 346 0 0 0 66 70 0

 Mature females 205 70 132 0 1,663 450 499 135 1,661 418 217

 Total weight (kg) 5.12 0.98 18.98 8.90 24.22 14.43 34.70 12.26 36.98 12.30 5.92

Opilio Tanner Crab

 Immature males 68 70 66 0 277 0 0 0 0 0 0

 Mature males 0 70 132 67 1,039 0 0 0 66 0 0

 Legal 68 139 198 67 1,247 0 0 0 66 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 626 0 0 6,513 0 0 0 0 0 0

 Total weight (kg) 0.24 1.83 1.96 0.80 22.04 0.00 0.00 0.00 0.57 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 0 0 0 69 0 0 0 0 0 0

 Mature males 0 0 198 67 831 0 125 0 66 0 0

 Immature females 0 0 198 67 901 0 125 0 66 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 2.51 0.59 10.33 0.00 1.52 0.00 0.53 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

187

Station D-18 E-01 E-02 E-03 E-04 E-05 E-06 E-07 E-08 E-09 E-10

Start Date 7/1/2017 6/30/2017 6/27/2017 6/26/2017 6/24/2017 6/24/2017 6/20/2017 6/18/2017 6/19/2017 6/10/2017 6/10/2017

Duration (hour) 0.52 0.51 0.53 0.52 0.53 0.52 0.52 0.52 0.52 0.53 0.54

Distance Fished (km) 2.93 2.67 2.88 2.82 2.86 2.97 2.85 2.84 2.91 2.84 2.75

Mid-Latitude (oN) 56.01178 56.32944 56.33727 56.34714 56.32622 56.33151 56.3282 56.33439 56.30689 56.33369 56.32973

Mid-Longitude (oW) -168.2284 -167.65304 -167.04023 -166.40911 -165.80249 -165.1917 -164.58263 -164.00874 -163.40872 -162.80445 -162.19615

Bottom Depth (m) 151 129 113 103 93 87 87 87 86 78 76

Bottom Temperature (oC) 4.5 4.2 3.7 2.8 2 1.7 1.6 1.5 1.3 1.1 2.3

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 70 0 357

 Mature males 0 0 0 0 0 0 0 0 0 137 285

 Legal 0 0 0 0 0 0 0 0 0 137 71

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 206 357

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.78 10.70 17.80

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 20,331 1,585 131 553 427 638 829 268 1,253 823 214

 Mature males 900 936 1,771 1,037 853 1,468 1,519 1,340 3,967 3,907 2,211

 Legal 692 864 1,509 899 711 1,085 1,105 804 3,201 2,810 1,926

 Immature females 33,891 720 66 553 711 192 0 134 278 0 0

 Mature females 0 0 1,246 346 142 894 207 402 1,949 1,234 1,070

 Total weight (kg) 10.08 8.04 20.5 9.88 9.31 18.23 18.35 15.40 46.21 43.24 29.14

Opilio Tanner Crab

 Immature males 0 792 66 69 71 0 0 134 0 0 0

 Mature males 346 216 525 138 498 483 0 67 0 0 0

 Legal 346 720 525 207 569 483 0 134 0 0 0

 Immature females 0 0 0 0 0 0 0 67 0 0 0

 Mature females 0 72 6,183 0 0 0 0 0 0 0 0

 Total weight (kg) 2.04 3.65 15.79 2.22 5.57 4.09 0.00 1.33 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 72 0 0 0 0 138 0 0 0 0

 Mature males 0 216 328 69 284 0 69 0 0 0 0

 Immature females 0 216 328 69 284 0 69 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 2.05 3.01 0.74 2.36 0.00 0.83 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

188

Station E-11 E-12 E-18 E-19 E-20 E-21 E-22 F-01 F-02 F-03 F-04

Start Date 6/7/2017 6/6/2017 7/1/2017 7/17/2017 7/17/2017 7/17/2017 7/7/2017 6/29/2017 6/28/2017 6/25/2017 6/24/2017

Duration (hour) 0.52 0.52 0.52 0.52 0.52 0.51 0.52 0.52 0.52 0.52 0.53

Distance Fished (km) 2.91 2.8 2.74 2.81 2.9 2.8 2.85 2.81 2.89 2.77 2.8

Mid-Latitude (oN) 56.33847 56.34052 56.33459 56.33314 56.33742 56.33562 56.33316 56.66434 56.67877 56.67616 56.6677

Mid-Longitude (oW) -161.61595 -160.98741 -168.24634 -168.87636 -169.31494 -170.07847 -170.67651 -167.68521 -167.06936 -166.4207 -165.83748

Bottom Depth (m) 66 53 154 129 137 110 121 102 95 83 78

Bottom Temperature (oC) 2.9 4 4.4 3.8 4 3.9 4.5 1.5 1.7 1.6 1.4

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 483 76 0 0 0 0 0 0 0 0 0

 Total weight (kg) 8.66 1.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 276 379 6,156 2,264 5,978 1,440 6,247 135 884 290 589

 Mature males 690 606 3,378 1,235 131 686 68 270 408 1,740 1,251

 Legal 483 530 3,153 1,235 131 411 68 270 272 1,668 809

 Immature females 0 76 11,186 4,253 6,503 1,303 6,043 337 1,292 0 74

 Mature females 207 0 751 5,968 657 754 815 0 884 218 294

 Total weight (kg) 9.03 6.89 29.06 22.82 3.35 10.3 7.49 2.14 5.74 16.44 14.86

Opilio Tanner Crab

 Immature males 0 0 526 960 66 137 0 540 136 290 147

 Mature males 0 0 1,201 137 66 69 0 675 272 0 294

 Legal 0 0 1,501 617 66 137 0 1,147 340 73 368

 Immature females 0 0 0 0 0 343 0 0 0 0 0

 Mature females 0 0 9,009 16,631 263 0 0 810 68 0 147

 Total weight (kg) 0.00 0.00 20.55 25.38 0.95 0.87 0.00 9.33 2.45 0.63 2.56

Hybrid Tanner Crab

 Immature males 0 0 150 137 0 343 0 67 0 0 0

 Mature males 0 0 676 0 0 0 0 202 136 0 221

 Immature females 0 0 751 0 0 0 0 270 136 0 221

 Mature females 0 0 0 0 0 343 0 0 0 0 0

 Total weight (kg) 0.00 0.00 6.89 2.32 0.00 0.26 0.00 2.21 0.95 0.06 1.67
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

189

Station F-05 F-06 F-07 F-08 F-09 F-10 F-11 F-12 F-13 F-14 F-18

Start Date 6/25/2017 6/19/2017 6/18/2017 6/18/2017 6/11/2017 6/9/2017 6/7/2017 6/6/2017 6/6/2017 6/4/2017 7/1/2017

Duration (hour) 0.53 0.53 0.53 0.53 0.52 0.51 0.4 0.52 0.53 0.52 0.52

Distance Fished (km) 2.96 2.87 2.83 2.95 2.78 2.76 2.13 2.89 3.02 2.79 2.69

Mid-Latitude (oN) 56.66458 56.67226 56.66762 56.66712 56.67676 56.66206 56.67378 56.66297 56.66878 56.67225 56.66887

Mid-Longitude (oW) -165.21383 -164.58064 -164.02263 -163.39269 -162.79117 -162.18894 -161.57331 -161.00008 -160.36712 -159.75542 -168.30229

Bottom Depth (m) 77 75 75 75 72 71 90 66 59 39 107

Bottom Temperature (oC) 1.3 1.4 0.4 0.8 1.6 1.4 1.8 2.9 3.4 4.8 2.2

Red King Crab

 Immature males 0 0 66 0 71 0 94 300 71 80 0

 Mature males 325 145 132 0 141 373 94 375 71 80 0

 Legal 325 72 66 0 141 373 94 375 71 80 0

 Immature females 0 0 0 0 0 0 0 225 71 0 0

 Mature females 0 0 0 135 353 2,164 1,321 1,349 141 80 0

 Total weight (kg) 16.15 4.04 5.92 1.28 14.53 48.74 19.96 49.49 6.25 3.85 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 586 1,302 462 405 635 149 94 150 141 159 224

 Mature males 1,172 4,197 1,781 1,688 1,552 821 2,076 1,124 424 319 2,390

 Legal 976 2,605 1,188 810 1,411 597 2,076 899 354 239 1,942

 Immature females 130 0 66 0 0 0 0 0 0 0 1,046

 Mature females 521 1,085 1,122 473 212 75 1,227 899 141 0 0

 Total weight (kg) 15.12 44.88 22.77 15.51 17.98 7.78 22.05 16.36 5.57 2.66 17.19

Opilio Tanner Crab

 Immature males 0 217 66 68 0 0 0 0 0 0 1,046

 Mature males 0 434 264 68 0 0 0 0 0 0 1,494

 Legal 0 651 264 135 0 0 0 0 0 0 2,316

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 57,692

 Total weight (kg) 0.00 3.66 2.46 1.58 0.00 0.00 0.00 0.00 0.00 0.00 64.37

Hybrid Tanner Crab

 Immature males 0 72 0 0 0 0 0 0 0 0 75

 Mature males 0 217 198 68 0 0 0 0 0 0 149

 Immature females 0 289 198 68 0 0 0 0 0 0 224

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 1.48 1.93 0.29 0.00 0.00 0.00 0.00 0.00 0.00 2.28
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

190

Station F-19 F-20 F-21 F-22 F-23 F-24 F-25 G-01 G-02 G-03 G-04

Start Date 7/17/2017 7/17/2017 7/17/2017 7/7/2017 7/9/2017 7/18/2017 7/18/2017 6/29/2017 6/28/2017 6/25/2017 6/24/2017

Duration (hour) 0.52 0.52 0.51 0.52 0.52 0.51 0.49 0.52 0.53 0.53 0.53

Distance Fished (km) 2.81 2.9 2.8 2.9 2.8 2.74 2.67 2.9 2.94 2.84 2.88

Mid-Latitude (oN) 56.6673 56.67793 56.66921 56.6691 56.67147 56.66585 56.65838 56.99761 57.00722 57.00134 56.99075

Mid-Longitude (oW) -168.91142 -169.49945 -170.09758 -170.73196 -171.35315 -171.97567 -172.55925 -167.69743 -167.09028 -166.47486 -165.86375

Bottom Depth (m) 100 79 95 114 120 126 139 78 74 73 72

Bottom Temperature (oC) 2.2 4.6 4 4.4 4.4 4.1 4.1 1.8 1.5 0.5 0.4

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 140

 Legal 0 0 0 0 0 0 0 0 0 0 70

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.56

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 716 943 1,705 727 792 5,636 0 269 935 433 419

 Mature males 5,373 1,886 4,120 1,124 216 289 0 3,633 863 938 280

 Legal 4,729 1,813 3,481 925 144 145 0 3,363 719 722 140

 Immature females 0 145 284 991 648 4,697 151 67 144 289 70

 Mature females 4,084 0 4,262 198 144 3,107 0 471 288 361 70

 Total weight (kg) 57.26 19.39 56.37 11.90 2.31 10.71 0.02 28.69 9.91 9.39 2.93

Opilio Tanner Crab

 Immature males 2,293 73 10,372 0 1,296 0 0 807 1,007 289 280

 Mature males 716 0 995 0 216 289 0 404 431 72 0

 Legal 1,863 73 4,547 0 792 289 0 673 863 217 140

 Immature females 0 0 0 0 0 145 0 0 0 0 0

 Mature females 22,824 0 0 0 54,089 0 0 0 72 72 0

 Total weight (kg) 38.74 0.28 28.22 0.00 50.19 2.04 0.00 4.84 6.14 1.56 0.86

Hybrid Tanner Crab

 Immature males 143 0 0 0 0 723 0 67 144 72 0

 Mature males 215 0 0 0 144 0 0 135 0 0 70

 Immature females 287 0 0 0 144 0 0 202 72 72 70

 Mature females 0 0 0 0 0 723 0 0 0 0 0

 Total weight (kg) 4.44 0.00 0.00 0.00 1.88 0.10 0.00 1.16 0.39 0.33 0.52
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

191

Station G-05 G-06 G-07 G-08 G-09 G-10 G-11 G-12 G-13 G-14 G-15

Start Date 6/25/2017 6/19/2017 6/19/2017 6/18/2017 6/11/2017 6/9/2017 6/7/2017 6/7/2017 6/6/2017 6/4/2017 6/4/2017

Duration (hour) 0.51 0.52 0.52 0.52 0.53 0.54 0.52 0.52 0.52 0.51 0.54

Distance Fished (km) 2.81 2.83 2.75 2.84 2.8 3.08 2.72 2.79 2.88 2.87 2.89

Mid-Latitude (oN) 57.00111 57.0023 56.98831 57.00203 56.99865 56.99109 57.00011 56.99676 56.99511 57.00057 57.00585

Mid-Longitude (oW) -165.21457 -164.60565 -164.03053 -163.38627 -162.79754 -162.16731 -161.56483 -160.9497 -160.33839 -159.71553 -159.13143

Bottom Depth (m) 72 70 69 66 61 61 70 64 64 56 36

Bottom Temperature (oC) 0.4 0 -0.5 0.6 0.9 3 2 3.2 3.6 3.7 5.2

Red King Crab

 Immature males 0 0 0 143 142 330 365 0 223 73 0

 Mature males 0 659 214 2,783 355 923 585 72 372 439 0

 Legal 0 586 143 2,355 355 659 511 72 298 439 0

 Immature females 0 0 0 0 0 132 0 0 0 0 0

 Mature females 0 0 0 0 213 5,932 4,530 288 1,861 586 0

 Total weight (kg) 0.00 28.06 7.42 85.49 18.34 141.24 98.48 8.82 46.82 30.86 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 841 1,098 1,570 357 569 330 146 144 74 439 75

 Mature males 631 952 285 428 427 264 877 216 670 293 0

 Legal 561 439 143 143 284 198 731 144 372 73 0

 Immature females 0 0 357 0 213 66 0 0 0 0 0

 Mature females 491 439 214 0 213 0 146 144 74 0 0

 Total weight (kg) 10.48 12.79 5.88 3.95 6.80 3.29 9.08 3.86 6.32 4.52 0.45

Opilio Tanner Crab

 Immature males 0 0 214 0 71 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 143 0 71 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.74 0.00 0.28 0.00 0.00 0.00 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 0 143 71 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 71 0 0 0 0 0 0 0

 Mature females 0 0 71 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.09 0.21 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

192

Station G-18 G-19 G-20 G-21 G-22 G-23 G-24 G-25 G-26 GF1918 GF2019

Start Date 7/2/2017 7/4/2017 7/4/2017 7/6/2017 7/7/2017 7/9/2017 7/9/2017 7/18/2017 7/18/2017 7/1/2017 7/4/2017

Duration (hour) 0.52 0.52 0.52 0.52 0.52 0.53 0.51 0.51 0.5 0.52 0.52

Distance Fished (km) 2.81 2.84 2.9 2.85 2.91 2.85 2.83 2.77 2.79 2.77 2.78

Mid-Latitude (oN) 57.00258 57.00077 57.00211 57.01885 56.99949 57.00054 56.99855 57.00193 56.99601 56.83862 56.83439

Mid-Longitude (oW) -168.32137 -168.94606 -169.55124 -170.19337 -170.78659 -171.39904 -172.03894 -172.64299 -173.25164 -168.62078 -169.30764

Bottom Depth (m) 81 80 60 66 96 109 117 122 141 97 80

Bottom Temperature (oC) 2.3 2.8 3.9 4.9 3.9 4.4 4.4 4.4 4.4 2.3 4.1

Red King Crab

 Immature males 0 0 71 0 0 0 0 0 0 0 0

 Mature males 0 0 71 72 0 0 0 0 0 0 0

 Legal 0 0 71 72 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 640 72 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 16.64 5.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 284 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 4.74 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 145 1,363 995 644 1,663 842 144 210 705 296 377

 Mature males 3,119 5,884 1,422 1,289 931 70 72 210 0 4,961 2,567

 Legal 2,539 5,238 1,280 788 798 0 72 140 0 4,442 2,416

 Immature females 0 0 498 143 266 491 288 210 1,058 0 0

 Mature females 1,523 0 569 72 200 70 216 210 0 1,407 0

 Total weight (kg) 25.68 46.06 26.02 9.58 10.81 1.45 1.11 2.20 0.41 41.99 20.68

Opilio Tanner Crab

 Immature males 0 2,321 502 569 0 1,474 4,537 140 0 3,702 151

 Mature males 0 1,668 431 427 0 351 3,025 0 0 1,259 151

 Legal 0 3,047 718 853 0 1,264 6,337 70 0 2,888 302

 Immature females 0 0 0 0 0 0 0 0 0 0 75

 Mature females 0 73 3,085 0 0 27,900 33,693 0 0 15,252 151

 Total weight (kg) 0.00 16.80 6.47 3.29 0.00 35.91 65.73 0.32 0.00 36.40 1.70

Hybrid Tanner Crab

 Immature males 0 287 0 0 0 0 0 70 0 74 0

 Mature males 363 0 0 0 0 0 0 0 0 592 0

 Immature females 363 215 0 0 0 0 0 0 0 666 0

 Mature females 0 0 0 0 0 0 0 70 0 0 0

 Total weight (kg) 2.91 1.50 0.00 0.00 0.00 0.39 0.00 0.01 0.00 6.96 0.30
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

193

Station GF2120 GF2221 H-01 H-02 H-03 H-04 H-05 H-06 H-07 H-08 H-09

Start Date 7/4/2017 7/7/2017 6/29/2017 6/28/2017 6/25/2017 6/24/2017 6/25/2017 6/19/2017 6/19/2017 6/18/2017 6/11/2017

Duration (hour) 0.53 0.52 0.51 0.51 0.51 0.53 0.52 0.53 0.53 0.5 0.53

Distance Fished (km) 2.94 2.89 2.69 2.73 2.8 2.86 2.86 2.9 2.81 2.6 2.76

Mid-Latitude (oN) 56.83534 56.83722 57.33266 57.33757 57.335 57.3258 57.32825 57.33399 57.32568 57.33257 57.32991

Mid-Longitude (oW) -169.89328 -170.47429 -167.73528 -167.12021 -166.49582 -165.86629 -165.23425 -164.61537 -163.9962 -163.38706 -162.75945

Bottom Depth (m) 72 101 74 71 70 67 68 65 62 53 50

Bottom Temperature (oC) 4.5 3.9 1.5 0.7 0.2 0.2 0.2 -0.2 0 1.6 2.6

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 80 222

 Mature males 0 0 0 0 0 0 0 277 72 239 370

 Legal 0 0 0 0 0 0 0 277 72 159 370

 Immature females 0 0 0 0 0 0 0 0 0 0 74

 Mature females 0 0 0 0 0 0 0 0 0 0 740

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 11.24 3.76 8.50 27.97

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 1,193 3,551 687 310 750 289 340 693 502 159 148

 Mature males 1,896 2,747 1,373 232 826 72 68 277 72 80 148

 Legal 1,545 2,345 687 155 450 72 0 208 72 0 148

 Immature females 211 1,072 0 0 75 0 0 0 72 0 0

 Mature females 70 1,139 534 0 0 72 68 69 0 80 0

 Total weight (kg) 17.26 34.16 10.62 2.47 7.39 1.60 1.70 5.50 2.01 1.42 1.24

Opilio Tanner Crab

 Immature males 5,195 134 839 774 600 145 0 0 0 0 0

 Mature males 2,317 536 76 0 0 0 0 0 0 0 0

 Legal 6,178 603 305 310 75 72 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 24.69 3.62 2.43 2.00 1.27 0.36 0.00 0.00 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 702 201 153 0 150 0 0 0 0 0 0

 Mature males 351 201 76 0 75 72 0 0 0 0 0

 Immature females 842 201 229 0 150 72 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 3.66 1.74 0.97 0.00 0.45 0.33 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

194

Station H-10 H-11 H-12 H-13 H-14 H-15 H-16 H-18 H-19 H-20 H-21

Start Date 6/9/2017 6/8/2017 6/6/2017 6/6/2017 6/4/2017 6/5/2017 6/4/2017 7/2/2017 7/3/2017 7/3/2017 7/3/2017

Duration (hour) 0.52 0.51 0.51 0.52 0.51 0.52 0.54 0.51 0.51 0.52 0.51

Distance Fished (km) 2.93 2.75 2.79 2.91 2.81 2.86 3.06 2.79 2.69 2.85 2.78

Mid-Latitude (oN) 57.33745 57.33285 57.34232 57.3348 57.32978 57.33855 57.34 57.33572 57.33322 57.3406 57.34

Mid-Longitude (oW) -162.13204 -161.52867 -160.94289 -160.30253 -159.67039 -159.05564 -158.4 -168.36995 -168.9868 -169.60684 -170.23

Bottom Depth (m) 51 57 59 62 54 49 30 74 70 63 56

Bottom Temperature (oC) 3.5 3.2 3.3 3.6 3.4 3.8 5.4 2.3 2.5 3 5.9

Red King Crab

 Immature males 71 462 0 0 72 0 0 0 0 0 0

 Mature males 212 77 0 351 1,015 78 0 0 0 73 0

 Legal 71 77 0 281 870 78 0 0 0 73 0

 Immature females 0 0 0 0 145 78 0 0 0 0 0

 Mature females 635 231 0 632 1,232 156 0 0 0 219 0

 Total weight (kg) 17.14 9.74 0.00 23.98 69.24 6.26 0.00 0.00 0.00 7.58 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 80 0 0

 Legal 0 0 0 0 0 0 0 0 80 0 0

 Immature females 0 0 0 0 0 0 0 0 80 0 0

 Mature females 0 0 0 0 0 0 0 0 80 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.81 0.00 0.00

Bairdi Tanner Crab

 Immature males 212 308 73 140 0 78 0 525 719 1,096 0

 Mature males 353 308 734 351 290 156 0 1,949 2,638 4,093 0

 Legal 212 231 514 281 145 78 0 1,499 2,078 3,216 0

 Immature females 0 0 0 0 0 0 0 0 0 146 0

 Mature females 0 77 0 0 0 0 0 150 160 0 0

 Total weight (kg) 2.92 4.03 6.67 4.00 3.18 1.58 0.00 13.53 18.64 33.94 0.00

Opilio Tanner Crab

 Immature males 0 0 0 0 0 0 0 600 160 2,558 0

 Mature males 0 0 0 0 0 0 0 150 80 219 0

 Legal 0 0 0 0 0 0 0 525 160 1,096 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 146 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.28 0.73 7.25 0.00

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 292 0

 Mature males 0 0 0 0 0 0 0 0 80 658 0

 Immature females 0 0 0 0 0 0 0 0 80 950 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.37 5.68 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

195

Station H-22 H-23 H-24 H-25 H-26 HG1918 HG2019 HG2120 HG2221 I-01 I-02

Start Date 7/7/2017 7/9/2017 7/9/2017 7/18/2017 7/18/2017 7/2/2017 7/3/2017 7/3/2017 7/6/2017 6/29/2017 6/28/2017

Duration (hour) 0.52 0.51 0.51 0.43 0.51 0.52 0.51 0.52 0.52 0.52 0.52

Distance Fished (km) 2.78 2.78 2.76 2.36 2.92 2.84 2.79 2.9 2.89 2.76 2.79

Mid-Latitude (oN) 57.33568 57.33466 57.33508 57.35549 57.33039 57.16497 57.16738 57.16626 57.11153 57.668 57.65899

Mid-Longitude (oW) -170.85279 -171.46998 -172.10209 -172.80513 -173.32589 -168.62982 -169.31341 -169.88685 -170.46941 -167.76741 -167.13274

Bottom Depth (m) 83 101 108 118 122 76 73 50 47 69 69

Bottom Temperature (oC) 4.8 3.9 4.1 4.4 4.4 2.7 3 5.4 5.5 0.4 0.4

Red King Crab

 Immature males 0 0 0 0 0 0 0 73 0 0 0

 Mature males 0 0 0 0 0 0 0 73 2,405 0 0

 Legal 0 0 0 0 0 0 0 73 2,333 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 73 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6.3 101.42 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 77 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 1.79 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 355 935 141 0 137 525 2,984 952 219 722 234

 Mature males 2,912 10,432 71 0 0 1,876 10,100 659 437 433 390

 Legal 2,699 9,856 71 0 0 1,651 6,580 440 364 217 312

 Immature females 0 216 141 82 69 0 0 147 0 0 0

 Mature females 710 5,612 0 0 0 75 0 0 0 72 78

 Total weight (kg) 31.02 115.63 0.80 0.01 0.07 15.25 69.58 6.75 3.23 4.98 3.39

Opilio Tanner Crab

 Immature males 0 647 2,398 0 0 75 2,219 0 146 722 468

 Mature males 0 144 2,398 0 0 0 459 0 0 144 0

 Legal 0 504 4,303 0 0 0 1,377 0 146 505 78

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 144 77,009 0 0 0 3,367 0 0 72 0

 Total weight (kg) 0.00 2.86 89.46 0.00 0.00 0.10 9.89 0.00 0.28 2.79 1.44

Hybrid Tanner Crab

 Immature males 0 144 0 0 0 0 306 0 0 361 156

 Mature males 71 144 0 0 0 0 1,071 0 0 72 78

 Immature females 71 288 0 0 0 0 1,224 0 0 289 234

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.24 2.75 1.05 0.00 0.00 0.00 6.46 0.00 0.00 0.93 0.94
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

196

Station I-03 I-04 I-05 I-06 I-07 I-08 I-09 I-10 I-11 I-12 I-13

Start Date 6/25/2017 6/24/2017 6/25/2017 6/26/2017 6/18/2017 6/18/2017 6/11/2017 6/9/2017 6/8/2017 6/6/2017 6/5/2017

Duration (hour) 0.52 0.52 0.52 0.51 0.52 0.53 0.53 0.52 0.52 0.52 0.52

Distance Fished (km) 2.87 2.86 2.98 2.92 2.85 2.89 2.76 2.97 2.92 2.91 2.83

Mid-Latitude (oN) 57.68482 57.6635 57.6654 57.66546 57.66833 57.65907 57.65009 57.66303 57.66359 57.66573 57.66228

Mid-Longitude (oW) -166.50893 -165.88909 -165.26975 -164.62921 -163.99669 -163.38398 -162.77396 -162.12735 -161.5051 -160.90383 -160.25861

Bottom Depth (m) 67 64 61 54 52 46 44 48 54 56 53

Bottom Temperature (oC) 0.6 0.5 1.2 1.8 2.2 3.3 3.9 3.6 2.8 2.9 3.3

Red King Crab

 Immature males 0 0 0 0 0 218 74 207 428 0 0

 Mature males 0 0 0 141 74 73 369 207 856 280 157

 Legal 0 0 0 71 74 0 296 207 856 280 157

 Immature females 0 0 0 0 0 0 148 621 214 0 0

 Mature females 0 0 0 0 0 73 296 276 500 210 235

 Total weight (kg) 0.00 0.00 0.00 3.65 3.23 3.74 19.84 19.61 49.33 10.48 12.24

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 426 299 66 989 296 145 0 69 71 140 157

 Mature males 142 150 0 0 74 73 74 138 0 0 235

 Legal 71 75 0 0 0 73 74 138 0 0 78

 Immature females 0 0 66 212 296 73 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 2.39 1.90 0.05 2.94 0.93 0.95 0.55 1.88 0.35 0.89 2.50

Opilio Tanner Crab

 Immature males 71 299 66 0 0 0 0 0 0 0 0

 Mature males 0 150 0 0 0 0 0 0 0 0 0

 Legal 0 225 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.16 1.43 0.16 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 71 0 0 0 0 0 0 0 0 0 0

 Immature females 71 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.43 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

197

Station I-14 I-15 I-16 I-18 I-19 I-20 I-21 I-22 I-23 I-24 I-25

Start Date 6/5/2017 6/5/2017 6/4/2017 7/2/2017 7/3/2017 7/3/2017 7/4/2017 7/4/2017 7/8/2017 7/8/2017 7/18/2017

Duration (hour) 0.52 0.52 0.53 0.51 0.51 0.51 0.42 0.52 0.52 0.51 0.52

Distance Fished (km) 2.96 2.82 3.03 2.75 2.73 2.84 2.34 2.88 2.77 2.68 2.76

Mid-Latitude (oN) 57.66619 57.66 57.66 57.67183 57.66809 57.66545 57.66687 57.6566 57.66526 57.66363 57.66453

Mid-Longitude (oW) -159.6305 -159.01 -158.37 -168.39747 -169.02908 -169.65562 -170.27005 -170.90482 -171.55165 -172.16309 -172.78887

Bottom Depth (m) 49 48 34 71 69 70 73 85 100 107 119

Bottom Temperature (oC) 3.4 4 4.9 1.6 1.4 2 2.8 3.1 3.4 3.4 4.4

Red King Crab

 Immature males 0 0 0 0 0 73 91 0 0 0 0

 Mature males 521 0 0 0 0 73 0 0 0 0 0

 Legal 447 0 0 0 0 73 0 0 0 0 0

 Immature females 74 0 0 0 0 0 0 0 0 0 0

 Mature females 745 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 37.58 0.00 0.00 0.00 0.00 4.32 0.001 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 78 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.87 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 298 0 0 533 781 291 2,173 407 1,408 222 0

 Mature males 0 0 0 229 1,328 1,601 1,358 3,591 5,112 0 0

 Legal 0 0 0 152 781 1,237 996 3,456 4,371 0 0

 Immature females 0 0 0 0 0 73 634 407 296 148 0

 Mature females 0 0 0 76 0 0 181 136 7,705 0 0

 Total weight (kg) 1.78 0.00 0.00 3.31 9.16 13.76 11.66 36.88 56.58 0.15 0.00

Opilio Tanner Crab

 Immature males 0 0 0 609 938 218 815 678 222 3,852 1,189

 Mature males 0 0 0 0 0 146 181 0 519 2,074 140

 Legal 0 0 0 381 78 218 362 474 519 4,075 699

 Immature females 0 0 0 0 78 0 0 0 0 0 70

 Mature females 0 0 0 0 0 0 0 0 370 34,393 21,973

 Total weight (kg) 0.00 0.00 0.00 1.63 1.60 1.43 2.25 2.08 3.90 52.58 28.34

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 156 73 181 1,084 74 0 0

 Immature females 0 0 0 0 156 73 181 1,084 74 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.90 0.49 1.48 8.32 0.73 0.73 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

198

Station I-26 IH1918 IH2019 IH2120 IH2221 J-01 J-02 J-03 J-04 J-05 J-06

Start Date 7/18/2017 7/2/2017 7/3/2017 7/3/2017 7/4/2017 6/29/2017 6/28/2017 6/26/2017 6/26/2017 6/26/2017 6/26/2017

Duration (hour) 0.5 0.51 0.28 0.52 0.52 0.52 0.53 0.52 0.51 0.52 0.52

Distance Fished (km) 2.82 2.81 1.5 2.82 2.87 2.68 2.87 3.01 2.96 2.92 3.04

Mid-Latitude (oN) 57.65227 57.50436 57.50013 57.50438 57.50373 58.00127 57.99206 57.99948 57.99693 58.0026 58.00343

Mid-Longitude (oW) -173.37469 -168.75502 -169.36362 -169.99067 -170.59332 -167.80775 -167.17147 -166.53206 -165.90871 -165.25227 -164.61062

Bottom Depth (m) 143 71 70 68 75 67 64 61 56 51 46

Bottom Temperature (oC) 4.1 2.3 2.2 2.7 3.5 0.7 0.5 0.8 2.2 2.9 3.3

Red King Crab

 Immature males 0 0 0 150 0 0 0 0 0 0 0

 Mature males 0 0 0 1,274 0 0 0 0 205 208 134

 Legal 0 0 0 974 0 0 0 0 137 208 134

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 300 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 58.49 0.00 0.00 0.00 0.00 7.45 7.80 5.47

Blue King Crab

 Immature males 0 0 0 75 0 0 0 0 0 0 0

 Mature males 0 0 139 75 0 0 0 0 0 0 0

 Legal 0 0 139 75 0 0 0 0 0 0 0

 Immature females 0 0 139 75 0 0 0 0 0 0 0

 Mature females 0 0 557 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 7.14 6.54 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 274 299 1,115 600 346 1,700 217 464 274 139 67

 Mature males 0 524 3,204 6,896 762 591 217 265 137 139 202

 Legal 0 299 2,647 5,997 693 443 72 133 68 139 67

 Immature females 343 0 279 0 0 0 0 133 0 139 0

 Mature females 0 0 139 225 554 0 0 0 0 0 0

 Total weight (kg) 0.43 4.25 14.76 57.70 10.68 7.12 1.98 2.49 1.93 1.96 2.01

Opilio Tanner Crab

 Immature males 0 225 139 825 69 0 290 0 0 0 0

 Mature males 0 75 139 150 0 0 290 0 0 0 0

 Legal 0 75 139 150 69 0 290 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.85 0.50 2.09 0.25 0.00 1.77 0.00 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 0 0 225 0 0 72 0 0 0 0

 Mature males 0 75 418 75 139 0 145 0 0 0 0

 Immature females 0 75 418 150 139 0 217 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.43 1.61 1.06 1.16 0.00 0.94 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

199

Station J-07 J-08 J-09 J-10 J-11 J-12 J-13 J-14 J-15 J-16 J-18

Start Date 6/17/2017 6/17/2017 6/11/2017 6/9/2017 6/8/2017 6/6/2017 6/5/2017 6/5/2017 6/5/2017 6/5/2017 7/2/2017

Duration (hour) 0.61 0.51 0.51 0.52 0.52 0.54 0.54 0.52 0.52 0.53 0.52

Distance Fished (km) 3.44 2.8 2.8 2.92 2.89 3.13 2.95 2.79 2.87 3.08 2.81

Mid-Latitude (oN) 57.99982 57.99994 57.99911 58.00375 58.00412 58.00483 57.98832 58.00803 58 57.99 57.99685

Mid-Longitude (oW) -164.00974 -163.38033 -162.75567 -162.12176 -161.48232 -160.8639 -160.21878 -159.61794 -158.97 -158.31 -168.43656

Bottom Depth (m) 47 44 40 39 56 45 50 42 43 36 69

Bottom Temperature (oC) 3.5 4 3.9 3.7 3 3.2 3.3 4 4.9 5.2 1

Red King Crab

 Immature males 123 246 153 149 1079 330 401 329 0 0 0

 Mature males 185 164 383 448 216 264 401 247 0 0 0

 Legal 185 0 383 224 72 132 401 164 0 0 0

 Immature females 0 246 0 149 647 0 80 164 0 0 0

 Mature females 123 82 230 224 288 132 802 82 0 0 0

 Total weight (kg) 10.83 6.79 15.84 15.01 18.21 13.17 32.44 7.86 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 123 82 0 0 216 0 241 247 0 0 508

 Mature males 62 82 0 0 0 132 0 82 0 0 290

 Legal 0 0 0 0 0 132 0 82 0 0 218

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.77 0.70 0.00 0.00 1.02 0.76 1.10 1.59 0.00 0.00 3.21

Opilio Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 1,089

 Mature males 0 0 0 0 0 0 0 0 0 0 73

 Legal 0 0 0 0 0 0 0 0 0 0 290

 Immature females 0 0 0 0 0 0 0 0 0 0 73

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.32

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 145

 Mature males 0 0 0 0 0 0 0 0 0 0 290

 Immature females 0 0 0 0 0 0 0 0 0 0 435

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.07
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

200

Station J-19 J-20 J-21 J-22 J-23 J-24 J-25 J-26 JI1918 JI2019 JI2120

Start Date 7/2/2017 7/2/2017 7/7/2017 7/7/2017 7/8/2017 7/8/2017 7/19/2017 7/19/2017 7/3/2017 7/2/2017 7/3/2017

Duration (hour) 0.51 0.51 0.52 0.52 0.51 0.51 0.51 0.51 0.51 0.52 0.51

Distance Fished (km) 2.76 2.75 2.81 2.87 2.75 2.74 2.74 2.75 2.69 2.81 2.81

Mid-Latitude (oN) 57.99941 58.00057 57.99418 57.99736 58.00176 57.99835 58.00076 57.98774 57.8316 57.84521 57.83769

Mid-Longitude (oW) -169.05655 -169.69523 -170.35499 -170.96511 -171.59873 -172.23566 -172.87382 -173.49138 -168.73567 -169.36049 -169.98209

Bottom Depth (m) 70 70 75 87 98 105 109 118 71 67 72

Bottom Temperature (oC) 1 1.7 2.5 2.6 2.9 3.2 3.6 3.8 1.7 1.2 2.1

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 204 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 136 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.70 0.00

Bairdi Tanner Crab

 Immature males 520 446 282 278 101 3,594 5,474 805 309 272 365

 Mature males 594 446 141 278 609 0 0 0 77 408 657

 Legal 297 298 141 278 507 0 0 0 77 272 292

 Immature females 0 0 282 0 0 2,875 6,929 512 0 0 0

 Mature females 0 0 0 0 731 216 0 146 0 0 0

 Total weight (kg) 5.24 3.52 1.82 2.77 6.33 2.09 1.51 0.63 1.12 4.16 5.16

Opilio Tanner Crab

 Immature males 1,039 446 563 347 15,054 503 970 220 309 544 584

 Mature males 74 0 0 139 1,900 431 1,178 220 0 204 0

 Legal 148 74 70 208 8,769 647 1,871 366 0 272 146

 Immature females 148 298 141 0 0 0 0 0 0 0 0

 Mature females 74 74 70 0 261,262 791 2,979 0 0 68 146

 Total weight (kg) 2.33 0.87 1.31 1.49 224.43 3.93 14.14 2.44 0.58 2.76 1.36

Hybrid Tanner Crab

 Immature males 74 0 70 0 73 0 0 0 0 136 0

 Mature males 74 74 0 69 146 0 0 0 0 68 0

 Immature females 74 74 70 69 219 0 0 0 0 136 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.46 0.53 0.24 0.53 1.73 0.00 0.00 0.00 0.00 0.68 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

201

Station JI2221 K-01 K-02 K-03 K-04 K-05 K-06 K-07 K-08 K-09 K-10

Start Date 7/4/2017 6/29/2017 6/28/2017 6/27/2017 6/27/2017 6/16/2017 6/16/2017 6/17/2017 6/17/2017 6/12/2017 6/8/2017

Duration (hour) 0.53 0.53 0.52 0.52 0.52 0.53 0.53 0.52 0.52 0.53 0.53

Distance Fished (km) 2.92 2.85 2.81 2.9 3.07 2.98 2.95 2.83 2.9 3.05 2.94

Mid-Latitude (oN) 57.83383 58.33384 58.33715 58.33469 58.34291 58.33334 58.33422 58.33216 58.34 58.33703 58.32808

Mid-Longitude (oW) -170.62469 -167.84554 -167.20327 -166.55722 -165.93433 -165.28879 -164.6245 -163.992 -163.38 -162.72899 -162.08187

Bottom Depth (m) 78 60 52 48 45 45 44 41 36 32 47

Bottom Temperature (oC) 2.7 0.9 2.1 3.2 3.7 2.7 3 4.1 4.8 5 4.9

Red King Crab

 Immature males 0 0 0 0 0 0 143 78 0 0 285

 Mature males 0 72 72 0 473 0 72 78 0 71 71

 Legal 0 72 72 0 473 0 72 78 0 71 0

 Immature females 0 0 0 0 0 0 0 78 0 0 71

 Mature females 0 0 0 72 0 281 72 78 0 71 0

 Total weight (kg) 0.00 3.50 3.51 0.85 19.06 4.74 5.17 5.23 0.00 3.28 3.95

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 960 359 143 217 203 281 143 78 0 142 71

 Mature males 1,440 0 72 145 203 70 0 0 0 0 142

 Legal 686 0 72 145 203 70 0 0 0 0 71

 Immature females 137 72 0 0 0 70 72 0 0 0 0

 Mature females 0 72 0 0 0 0 0 0 0 0 0

 Total weight (kg) 12.51 1.25 1.06 1.46 2.96 1.54 0.68 0.22 0.00 0.54 1.15

Opilio Tanner Crab

 Immature males 960 1,220 0 0 0 0 0 0 0 0 0

 Mature males 274 502 0 0 0 0 0 0 0 0 0

 Legal 892 861 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 137 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 4.78 4.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 412 0 0 0 0 0 0 0 0 0 0

 Mature males 137 502 0 0 0 0 0 0 0 0 0

 Immature females 549 502 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 2.17 2.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

202

Station K-11 K-12 K-13 K-14 K-18 K-19 K-20 K-21 K-22 K-23 K-24

Start Date 6/8/2017 6/6/2017 6/6/2017 6/5/2017 7/2/2017 7/8/2017 7/8/2017 7/7/2017 7/7/2017 7/10/2017 7/10/2017

Duration (hour) 0.38 0.32 0.51 0.54 0.55 0.52 0.51 0.53 0.53 0.52 0.51

Distance Fished (km) 2.04 1.81 2.95 2.97 2.85 2.77 2.83 2.94 2.81 2.86 2.7

Mid-Latitude (oN) 58.22192 58.28478 58.27448 58.33 58.33555 58.33766 58.33586 58.34781 58.32613 58.33404 58.33522

Mid-Longitude (oW) -161.54928 -160.80355 -159.96484 -159.55 -168.46227 -169.12582 -169.73145 -170.38723 -171.02152 -171.648 -172.30009

Bottom Depth (m) 40 31 42 24 65 68 69 74 84 96 103

Bottom Temperature (oC) 4.2 6.2 4.8 5.7 0.6 1 1.4 1.6 1.5 2.9 3.1

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 105 0 0 0 0 145 0 0 0 0 0

 Legal 105 0 0 0 0 145 0 0 0 0 0

 Immature females 0 0 69 0 0 0 0 0 0 0 0

 Mature females 105 117 69 0 0 0 0 0 0 0 0

 Total weight (kg) 5.91 1.02 1.35 0.00 0.00 5.10 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 216 436 434 349 69 1,865 5,098

 Mature males 0 0 0 0 72 218 0 139 0 143 152

 Legal 0 0 0 0 72 218 0 139 0 143 0

 Immature females 0 0 0 0 0 0 0 0 69 1,219 4,413

 Mature females 0 0 0 0 0 0 0 0 0 143 228

 Total weight (kg) 0.00 0.00 0.00 0.00 1.06 2.96 1.38 2.00 0.20 2.80 6.75

Opilio Tanner Crab

 Immature males 0 0 0 0 22,055 7,266 36,413 13,385 485 3,156 10,957

 Mature males 0 0 0 0 2,883 2,325 1,084 70 0 861 5,174

 Legal 0 0 0 0 14,199 4,941 8,523 1,464 139 1,937 11,337

 Immature females 0 0 0 0 72 73 1,229 1,520 0 1,004 7,389

 Mature females 0 0 0 0 72 73 4,338 92,721 0 12,696 432,283

 Total weight (kg) 0.00 0.00 0.00 0.00 61.15 24.91 86.72 104.98 0.95 20.99 317.8

Hybrid Tanner Crab

 Immature males 0 0 0 0 288 509 723 70 69 215 0

 Mature males 0 0 0 0 288 1,308 145 70 0 72 0

 Immature females 0 0 0 0 577 1,599 651 139 0 72 0

 Mature females 0 0 0 0 0 0 0 0 0 72 1,065

 Total weight (kg) 0.00 0.00 0.00 0.00 2.2 8.24 2.52 0.56 0.02 0.94 3.56
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

203

Station K-25 K-26 K-27 L-01 L-02 L-03 L-04 L-05 L-06 L-07 L-08

Start Date 7/19/2017 7/19/2017 7/19/2017 6/29/2017 6/28/2017 6/27/2017 6/27/2017 6/16/2017 6/16/2017 6/16/2017 6/12/2017

Duration (hour) 0.51 0.51 0.52 0.52 0.52 0.51 0.51 0.51 0.52 0.53 0.52

Distance Fished (km) 2.88 2.82 2.88 2.85 2.91 2.93 2.73 2.89 2.88 3.01 2.92

Mid-Latitude (oN) 58.33492 58.32141 58.33825 58.68389 58.66963 58.6666 58.66339 58.66171 58.66835 58.67 58.67624

Mid-Longitude (oW) -172.93886 -173.56571 -174.30969 -167.87394 -167.21727 -166.56735 -165.93957 -165.30757 -164.65663 -164.01 -163.36081

Bottom Depth (m) 109 114 165 46 44 42 38 40 37 34 32

Bottom Temperature (oC) 3.5 4 3.5 3.7 4 4 5.1 3.2 4.4 5.5 4.9

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 296 138 73 78 0 0 0 0

 Legal 0 0 0 296 138 73 78 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 74 69 0 78 156 75 0 0

 Total weight (kg) 0.00 0.00 0.00 10.07 8.15 2.03 3.06 2.88 0.65 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 3,545 689 2,868 222 69 0 78 0 0 0 0

 Mature males 67 0 0 0 0 0 0 0 0 0 73

 Legal 67 0 0 0 0 0 0 0 0 0 73

 Immature females 4,080 757 4,948 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 1.33 0.20 1.18 0.23 0.02 0.00 0.17 0.00 0.00 0.00 0.75

Opilio Tanner Crab

 Immature males 67 413 72 0 0 0 0 0 0 0 0

 Mature males 2,809 964 72 0 0 0 0 0 0 0 0

 Legal 2,876 1,308 143 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 134 620 72 0 0 0 0 0 0 0 0

 Total weight (kg) 22.36 9.93 0.62 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 74 0 0 0 0 0 0 0

 Immature females 0 0 0 74 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

204

Station L-09 L-18 L-19 L-20 L-21 L-22 L-23 L-24 L-25 L-26 L-27

Start Date 6/12/2017 7/1/2017 7/8/2017 7/11/2017 7/11/2017 7/11/2017 7/10/2017 7/10/2017 7/19/2017 7/19/2017 7/19/2017

Duration (hour) 0.55 0.52 0.52 0.51 0.5 0.52 0.53 0.52 0.53 0.52 0.51

Distance Fished (km) 3.28 2.88 2.82 2.75 2.76 2.79 2.84 2.79 2.9 2.86 2.85

Mid-Latitude (oN) 58.67204 58.67383 58.6658 58.66891 58.67735 58.66613 58.66913 58.67251 58.66925 58.66786 58.66353

Mid-Longitude (oW) -162.70136 -168.47917 -169.15747 -169.80843 -170.43464 -171.08147 -171.71518 -172.37192 -172.98352 -173.63799 -174.27517

Bottom Depth (m) 23 53 62 66 73 83 92 101 112 127 158

Bottom Temperature (oC) 6.1 2.3 0.7 1 1.1 1.1 1.6 2.9 3.3 3.7 3.7

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 73 0 0 0 0 0 0 0 0 0

 Legal 0 73 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 78 0 0 0 0 0 0 0

 Total weight (kg) 0.00 5.02 0.00 1.20 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 77 0 717 543 74 140 282 437 4,697 1,099 19,005

 Mature males 0 73 0 0 295 0 0 0 65 206 136

 Legal 0 73 0 0 221 0 0 0 65 137 68

 Immature females 0 0 0 78 0 0 71 437 4,436 1,168 20,283

 Mature females 0 0 0 0 0 0 141 0 65 0 0

 Total weight (kg) 0.42 0.44 1.58 1.16 1.96 0.16 0.40 0.43 1.91 2.12 8.63

Opilio Tanner Crab

 Immature males 0 73 45,148 31,362 21,145 3,284 12,274 146 391 206 0

 Mature males 0 0 1,654 810 2,210 559 846 146 1,305 137 0

 Legal 0 0 11,395 8,185 9,210 1,258 1,834 292 1,696 275 0

 Immature females 0 0 359 1,800 516 0 682 0 65 0 0

 Mature females 0 73 72 343 4,568 8,175 248,271 219 196 69 0

 Total weight (kg) 0.00 0.16 79.11 55.72 52.14 16.20 191.39 1.30 12.22 2.13 0.00

Hybrid Tanner Crab

 Immature males 0 73 1,793 942 0 0 0 0 130 0 0

 Mature males 0 73 287 171 0 0 0 0 65 0 0

 Immature females 0 73 1,148 428 0 0 0 0 65 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.37 3.71 2.37 0.00 0.00 0.00 0.00 0.47 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

205

Station L-28 L-29 L-30 L-31 M-01 M-02 M-03 M-04 M-05 M-06 M-07

Start Date 7/26/2017 7/26/2017 7/27/2017 7/27/2017 6/29/2017 6/28/2017 6/27/2017 6/15/2017 6/15/2017 6/15/2017 6/12/2017

Duration (hour) 0.52 0.51 0.51 0.52 0.53 0.51 0.52 0.52 0.53 0.53 0.55

Distance Fished (km) 2.85 2.72 2.8 2.87 2.89 2.89 2.97 2.87 2.97 2.79 3.18

Mid-Latitude (oN) 58.6866 58.67918 58.6602 58.67534 59.00368 59.00282 59.01 59 59.001 59 59

Mid-Longitude (oW) -174.92366 -175.53393 -176.15061 -176.82073 -167.8782 -167.22924 -166.59 -165.93 -165.29794 -164.66 -164.01

Bottom Depth (m) 195 135 142 135 43 41 34 30 28 28 29

Bottom Temperature (oC) 3.7 3.5 3.4 3.4 4.2 4.1 4.9 5.1 5.1 6 5.9

Red King Crab

 Immature males 0 0 0 0 75 0 0 0 0 0 0

 Mature males 0 0 0 0 0 289 0 0 0 0 0

 Legal 0 0 0 0 0 217 0 0 0 0 0

 Immature females 0 0 0 0 75 0 0 0 0 0 0

 Mature females 0 0 0 0 0 145 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 1.74 11.6 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 66 1,965 414 0 75 0 0 0 75 0 0

 Mature males 0 1,965 69 0 0 0 0 0 0 0 0

 Legal 0 1,263 69 0 0 0 0 0 0 0 0

 Immature females 329 1,053 414 198 0 0 0 0 0 0 0

 Mature females 0 4,492 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.04 27.85 0.59 0.03 0.28 0.00 0.00 0.00 0.20 0.00 0.00

Opilio Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 281 0 0 0 0 0 0 0 0 0

 Legal 0 281 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 70 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 2.40 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.70 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

206

Station M-08 M-18 M-19 M-20 M-21 M-22 M-23 M-24 M-25 M-26 M-27

Start Date 6/12/2017 7/1/2017 7/8/2017 7/11/2017 7/11/2017 7/11/2017 7/20/2017 7/19/2017 7/19/2017 7/20/2017 7/26/2017

Duration (hour) 0.54 0.53 0.52 0.51 0.51 0.52 0.51 0.52 0.51 0.5 0.52

Distance Fished (km) 2.8 2.93 2.79 2.87 2.71 2.69 2.76 2.86 2.75 2.75 2.78

Mid-Latitude (oN) 58.99 58.99324 58.99725 59.00478 58.99773 58.98945 58.99486 59.00339 59.00291 58.99964 59.00055

Mid-Longitude (oW) -163.36 -168.53471 -169.17629 -169.83493 -170.48745 -171.12632 -171.7821 -172.42927 -173.07386 -173.72127 -174.36348

Bottom Depth (m) 23 46 54 63 72 78 87 98 107 117 128

Bottom Temperature (oC) 5.8 4 2.8 1 0.8 0.5 0.8 2.7 3 3.2 3.4

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 146 0 0 0 0 0 0 0 0 0

 Legal 0 146 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 6.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 73 0 0 0 0 74 266 3,295 3,141 10,063

 Mature males 0 0 0 0 0 0 0 0 69 205 68

 Legal 0 0 0 0 0 0 0 0 69 137 68

 Immature females 0 0 0 0 0 0 74 133 1,922 2,595 12,394

 Mature females 0 0 0 0 0 0 0 0 0 68 68

 Total weight (kg) 0.00 0.17 0.00 0.00 0.00 0.00 0.28 0.07 2.03 3.73 4.34

Opilio Tanner Crab

 Immature males 0 0 76 1,644 104,249 12,955 24,105 333 961 478 608

 Mature males 0 0 0 598 887 1,230 2,559 0 961 3,209 270

 Legal 0 0 0 971 5,767 4,415 8,753 133 1,785 3,687 878

 Immature females 0 0 0 299 9,793 576 5,003 266 137 0 0

 Mature females 0 0 0 0 8,971 40,347 158,385 0 206 68 68

 Total weight (kg) 0.00 0.00 0.19 5.35 136.10 56.41 209.59 0.90 10.35 29.05 4.25

Hybrid Tanner Crab

 Immature males 0 0 0 0 1,645 0 74 0 0 0 0

 Mature males 0 0 0 0 299 0 0 0 0 0 0

 Immature females 0 0 0 0 673 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 4.15 0.00 0.22 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

207

Station M-28 M-29 M-30 M-31 M-32 N-01 N-02 N-03 N-04 N-05 N-06

Start Date 7/26/2017 7/26/2017 7/26/2017 7/27/2017 7/27/2017 6/29/2017 6/28/2017 6/14/2017 6/15/2017 6/13/2017 6/13/2017

Duration (hour) 0.53 0.53 0.53 0.52 0.52 0.51 0.52 0.54 0.52 0.55 0.55

Distance Fished (km) 2.91 2.9 2.84 2.87 2.81 2.77 2.7 2.86 2.76 2.98 3.25

Mid-Latitude (oN) 59.00846 59.01072 59.0015 58.97676 59.00513 59.32218 59.33909 59.34 59.33 59.33 59.34

Mid-Longitude (oW) -175.00263 -175.743 -176.31143 -176.98415 -177.53819 -167.91374 -167.27763 -166.6 -165.95 -165.3 -164.65

Bottom Depth (m) 130 134 135 134 134 41 32 28 24 22 23

Bottom Temperature (oC) 3.2 3 3.1 3.4 3.6 4.7 5.2 4.8 5.8 6.4 8.1

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 81 77 0 0 0 0

 Legal 0 0 0 0 0 81 77 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 81 77 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 3.50 3.31 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 24,928 2,977 63 197 67 0 0 0 0 0 0

 Mature males 63 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 31,482 2,914 0 263 67 0 0 0 0 0 0

 Mature females 126 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 7.20 1.30 0.11 0.39 0.04 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 0 0 63 0 0 0 0 0 0 0 0

 Mature males 63 0 0 0 67 0 0 0 0 0 0

 Legal 63 0 63 0 67 0 0 0 0 0 0

 Immature females 0 0 189 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.50 0.00 0.26 0.00 0.68 0.00 0.00 0.00 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 0 0 66 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 66 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

208

Station N-07 N-18 N-19 N-20 N-21 N-22 N-23 N-24 N-25 N-26 N-27

Start Date 6/13/2017 7/1/2017 7/8/2017 7/11/2017 7/11/2017 7/20/2017 7/20/2017 7/21/2017 7/21/2017 7/20/2017 7/25/2017

Duration (hour) 0.55 0.51 0.52 0.52 0.5 0.52 0.51 0.52 0.52 0.5 0.52

Distance Fished (km) 2.96 2.82 2.83 2.79 2.78 2.8 2.69 2.83 2.93 2.74 2.74

Mid-Latitude (oN) 59.34 59.33228 59.33 59.34159 59.3433 59.33445 59.33215 59.33115 59.33346 59.32878 59.3301

Mid-Longitude (oW) -163.99 -168.58031 -169.24 -169.87209 -170.54433 -171.18722 -171.8462 -172.49296 -173.15883 -173.79472 -174.43491

Bottom Depth (m) 22 42 51 61 68 75 79 88 100 110 120

Bottom Temperature (oC) 8.2 4.6 3.7 1.3 0.4 -0.2 -0.5 1 2.4 2.8 3

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 81 0 0 79 0 0 0 0 367 2,383

 Mature males 0 0 0 0 0 0 0 0 0 73 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 808 2,383

 Mature females 0 0 0 0 0 0 0 0 0 0 68

 Total weight (kg) 0.00 0.29 0.00 0.00 0.19 0.00 0.00 0.00 0.00 0.81 1.21

Opilio Tanner Crab

 Immature males 0 0 0 151 226,604 105,003 55,866 829 403 73 68

 Mature males 0 0 0 151 2,834 1,119 1,095 69 537 2,351 272

 Legal 0 0 0 227 18,753 14,575 4,382 138 806 2,425 340

 Immature females 0 0 0 76 17,569 29,081 27,924 345 403 0 0

 Mature females 0 0 0 0 32,714 132,375 76,883 553 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.9 335.28 257.6 139.35 1.74 5.83 20.44 1.95

Hybrid Tanner Crab

 Immature males 0 0 0 0 1,212 602 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 606 301 0 0 0 0 0

 Mature females 0 0 0 0 606 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 2.48 1.08 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

209

Station N-28 N-29 N-30 N-31 O-01 O-02 O-03 O-04 O-18 O-19 O-20

Start Date 7/25/2017 7/28/2017 7/28/2017 7/28/2017 6/29/2017 6/28/2017 6/14/2017 6/15/2017 7/1/2017 7/9/2017 7/10/2017

Duration (hour) 0.51 0.53 0.51 0.51 0.52 0.52 0.55 0.54 0.51 0.52 0.5

Distance Fished (km) 2.77 2.94 2.77 2.8 2.82 2.85 3.12 3.19 2.89 2.85 2.7

Mid-Latitude (oN) 59.34609 59.33685 59.34262 59.3578 59.66104 59.67 59.67 59.65 59.66299 59.65523 59.67099

Mid-Longitude (oW) -175.13118 -175.74397 -176.38859 -177.08144 -167.95442 -167.29 -166.65 -165.96 -168.61721 -169.27364 -169.92231

Bottom Depth (m) 133 137 136 151 36 31 28 23 40 48 57

Bottom Temperature (oC) 3.2 2.9 2.7 3.2 5.2 6.4 5.6 6.5 3.9 2.4 0.5

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 76 0 0

 Mature males 0 0 0 0 236 0 0 0 76 227 0

 Legal 0 0 0 0 0 0 0 0 76 227 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 79 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 6.07 0.00 0.00 0.00 2.74 11.64 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 1,589 1,131 211 423 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 898 754 0 493 0 0 0 0 0 0 0

 Mature females 69 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.73 1.05 0.24 0.29 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 0 189 141 70 0 0 0 0 0 0 100,562

 Mature males 0 0 0 0 0 0 0 0 0 0 241

 Legal 0 63 0 0 0 0 0 0 0 0 3,208

 Immature females 0 314 632 211 0 0 0 0 0 0 22,973

 Mature females 346 0 0 0 0 0 0 0 0 0 840

 Total weight (kg) 0.35 0.41 0.15 0.05 0.00 0.00 0.00 0.00 0.00 0.00 92.72

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 1,121

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.6
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

210

Station O-21 O-22 O-23 O-24 O-25 O-26 O-27 O-28 O-29 O-30 O-31

Start Date 7/10/2017 7/20/2017 7/20/2017 7/22/2017 7/21/2017 7/20/2017 7/25/2017 7/25/2017 7/28/2017 7/28/2017 7/28/2017

Duration (hour) 0.52 0.52 0.52 0.51 0.53 0.51 0.53 0.5 0.52 0.51 0.49

Distance Fished (km) 2.83 2.87 2.71 2.72 3.01 2.76 2.85 2.72 2.95 2.78 2.72

Mid-Latitude (oN) 59.66223 59.6717 59.66451 59.66626 59.6686 59.66321 59.66417 59.66266 59.67285 59.65553 59.6778

Mid-Longitude (oW) -170.58385 -171.24449 -171.89398 -172.56224 -173.23837 -173.87824 -174.4602 -175.13331 -175.864 -176.55411 -177.11681

Bottom Depth (m) 67 73 78 84 95 104 115 125 138 136 166

Bottom Temperature (oC) -0.2 -0.8 -0.3 0.6 1 2 2.6 2.6 3.1 2.7 3.1

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 130 152 0 0 0 0 0

 Legal 0 0 0 0 130 76 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 3.65 3.58 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 76 0 0 191 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 228 0 0 191 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.12 0.00 0.00

Opilio Tanner Crab

 Immature males 87,470 15,534 71,937 76,889 975 761 3,033 3,798 64 70 71

 Mature males 891 69 0 376 1,105 761 2,696 777 1,335 0 0

 Legal 5,204 548 1,686 2,259 1,625 1,369 4,853 1,921 1,335 0 0

 Immature females 31,417 39,390 55,701 108,653 260 152 0 0 318 141 0

 Mature females 18,565 85,318 65,193 23,260 455 1,901 1,415 123,578 0 0 0

 Total weight (kg) 143.06 97.05 125.39 122.70 10.00 9.02 29.96 128.10 13.41 0.05 0.01

Hybrid Tanner Crab

 Immature males 655 0 0 0 0 0 0 0 0 0 0

 Mature males 74 0 0 0 0 0 0 0 0 0 0

 Immature females 74 0 0 0 0 0 0 0 0 0 0

 Mature females 328 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 1.15 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

211

Station ON2524 ON2625 P-01 P-18 P-19 P-20 P-21 P-22 P-23 P-24 P-25

Start Date 7/21/2017 7/20/2017 6/30/2017 6/30/2017 7/9/2017 7/10/2017 7/10/2017 7/23/2017 7/22/2017 7/22/2017 7/22/2017

Duration (hour) 0.53 0.5 0.53 0.51 0.51 0.5 0.51 0.52 0.52 0.5 0.4

Distance Fished (km) 2.94 2.76 2.91 2.8 2.81 2.78 2.82 2.91 2.8 2.77 2.24

Mid-Latitude (oN) 59.5015 59.49745 59.98857 60 59.99494 60.00248 59.9934 60.00283 59.98954 60.0046 59.99877

Mid-Longitude (oW) -172.8889 -173.50613 -167.9912 -168.66 -169.3159 -169.96867 -170.63135 -171.28805 -171.94147 -172.60824 -173.33656

Bottom Depth (m) 93 102 27 39 47 55 65 70 66 65 75

Bottom Temperature (oC) 0.8 2 4.7 4.3 2.5 0.3 -0.9 -0.8 -0.5 -0.3 -0.2

Red King Crab

 Immature males 0 0 77 0 0 0 0 0 0 0 0

 Mature males 0 0 77 0 154 0 0 0 0 0 0

 Legal 0 0 77 0 77 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 3.22 0.00 4.74 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 86

 Mature males 67 74 0 0 0 0 0 0 0 0 86

 Legal 67 74 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 2.27 1.68 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.62

Bairdi Tanner Crab

 Immature males 0 5,319 0 0 0 0 255 0 0 0 0

 Mature males 67 0 0 0 0 0 0 0 0 0 0

 Legal 67 0 0 0 0 0 0 0 0 0 0

 Immature females 0 15,164 0 0 0 0 0 0 0 0 0

 Mature females 0 74 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.69 1.30 0.00 0.00 0.00 0.00 0.06 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 1,737 4,937 0 0 386 107,438 97,198 191,808 110,417 16,446 15,319

 Mature males 2,004 811 0 0 0 155 294 65 0 0 86

 Legal 2,873 884 0 0 0 2,328 2,279 5,706 148 375 1,027

 Immature females 1,002 14,034 0 0 77 44,857 57,957 94,348 95,720 6,458 7,360

 Mature females 3,808 442 0 0 0 2,243 11,709 45,832 23,851 1,051 8,815

 Total weight (kg) 21.71 8.01 0.00 0.00 0.37 124.67 126.90 254.31 113.34 21.02 21.33

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

212

Station P-26 P-27 P-28 P-29 P-30 P-31 P-32 PO2423 PO2524 PO2625 PO2726

Start Date 7/21/2017 7/25/2017 7/25/2017 7/28/2017 7/28/2017 7/29/2017 7/29/2017 7/22/2017 7/22/2017 7/21/2017 7/20/2017

Duration (hour) 0.51 0.52 0.53 0.53 0.52 0.52 0.5 0.52 0.51 0.52 0.5

Distance Fished (km) 2.73 2.85 2.91 2.9 2.82 2.83 2.71 2.74 2.86 2.81 2.77

Mid-Latitude (oN) 59.99051 60.00463 60.00695 59.98614 59.99702 60.00166 59.99 59.83438 59.83035 59.83518 59.8355

Mid-Longitude (oW) -173.94197 -174.60422 -175.25531 -175.91986 -176.70796 -177.26061 -177.9 -172.25559 -172.92197 -173.59114 -174.23115

Bottom Depth (m) 97 108 117 130 141 137 141 75 80 95 106

Bottom Temperature (oC) 1.2 1.9 2.2 2.9 2.6 2.5 2.7 -0.3 0.4 1.3 2

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 77 0 0 0 0 0 0 0 142 139 295

 Legal 77 0 0 0 0 0 0 0 71 139 295

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 2.16 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.67 3.43 9.82

Bairdi Tanner Crab

 Immature males 0 0 869 64 0 0 0 0 0 0 0

 Mature males 0 66 0 0 0 0 0 0 0 0 0

 Legal 0 66 0 0 0 0 0 0 0 0 0

 Immature females 0 0 497 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.60 0.20 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 494,998 330 621 1,219 0 69 0 33,114 20,348 2,218 147

 Mature males 5,868 396 372 2,760 67 69 0 219 1,565 1,802 295

 Legal 49,207 594 683 3,594 67 69 0 1,242 5,194 3,118 369

 Immature females 7,104 0 434 128 67 0 0 6,578 5,123 2,218 221

 Mature females 589,653 0 124 0 0 0 0 6,285 56,574 1,039 0

 Total weight (kg) 1148.67 4.31 4.86 27.13 0.79 0.82 0.00 44.57 95.19 21.59 2.12

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

213

Station Q-01 Q-02 Q-18 Q-19 Q-20 Q-21 Q-22 Q-23 Q-25 Q-26 Q-27

Start Date 6/30/2017 6/30/2017 6/30/2017 7/9/2017 7/9/2017 7/23/2017 7/23/2017 7/23/2017 7/21/2017 7/21/2017 7/25/2017

Duration (hour) 0.52 0.53 0.52 0.52 0.5 0.52 0.52 0.52 0.25 0.39 0.52

Distance Fished (km) 2.86 2.99 2.83 2.86 2.76 2.84 2.8 2.79 1.34 2.13 2.84

Mid-Latitude (oN) 60.34 60.34 60.33136 60.32 60.33115 60.32596 60.33999 60.33188 60.29833 60.33333 60.33111

Mid-Longitude (oW) -167.99 -167.24 -168.67253 -169.33 -169.99027 -170.65344 -171.34534 -172.05691 -173.38045 -174.08797 -174.72752

Bottom Depth (m) 32 31 36 44 52 62 66 59 64 90 103

Bottom Temperature (oC) 6.6 7.7 5.1 4 0.2 -0.8 -1 -1.1 0.1 0.4 1.7

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 75 0 0 0 0 0 0 0 0

 Legal 0 0 75 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 2.16 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 874 0 0 453 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.64 0.00 0.00 0.84 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 0 0 0 0 397,339 294,305 398,130 187,398 16,270 86,311 1,061

 Mature males 0 0 0 0 158 0 2,520 0 291 2,694 332

 Legal 0 0 0 0 1,030 0 2,520 0 291 4,202 398

 Immature females 0 0 0 0 466,042 311,116 422,434 59,042 11,621 30,939 133

 Mature females 0 0 0 0 871 14,605 50,420 28,115 2,324 152,485 1,989

 Total weight (kg) 0.00 0.00 0.00 0.00 323.09 315.45 436.21 149.29 9.24 133.28 6.20

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 200 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

214

Station Q-28 Q-29 Q-30 Q-31 QP2423 QP2524 QP2625 QP2726 R-22 R-23 R-24

Start Date 7/25/2017 7/29/2017 7/29/2017 7/29/2017 7/22/2017 7/22/2017 7/22/2017 7/21/2017 7/23/2017 7/23/2017 7/24/2017

Duration (hour) 0.51 0.52 0.53 0.51 0.53 0.52 0.5 0.5 0.52 0.51 0.52

Distance Fished (km) 2.81 2.91 2.73 2.77 2.94 2.85 2.78 2.7 2.81 2.82 2.83

Mid-Latitude (oN) 60.34664 60.33158 60.34254 60.31835 60 60.17716 60.12344 60.16427 60.66803 60.66249 60.66782

Mid-Longitude (oW) -175.37653 -176.02647 -176.71457 -177.36047 -172 -173.02194 -173.76832 -174.36115 -171.42984 -172.11346 -172.74432

Bottom Depth (m) 111 121 137 147 58 59 88 100 63 61 46

Bottom Temperature (oC) 1.9 2.7 2.6 2.4 2.2 0.6 1 1 -1.2 -1.3 4

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 72 281 0 0 0 0 228

 Mature males 0 0 0 0 72 70 0 0 0 0 1,520

 Legal 0 0 0 0 0 70 0 0 0 0 988

 Immature females 0 0 0 0 0 211 0 0 0 0 228

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 2.22 3.93 0.00 0.00 0.00 0.00 35.88

Bairdi Tanner Crab

 Immature males 0 317 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 190 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 563 381 206 142 0 632 108,644 1,199 172,831 159,475 4,408

 Mature males 282 1,269 962 71 0 0 897 240 0 0 76

 Legal 282 1,523 1,100 213 0 0 2,540 240 0 0 76

 Immature females 493 571 0 71 0 281 76,093 0 142,726 104,823 2,508

 Mature females 634 317 0 0 0 0 15,219 1,919 16,014 24,005 456

 Total weight (kg) 2.93 12.93 8.92 1.02 0.00 0.42 161.26 3.60 151.40 135.76 4.19

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 70 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

215

Station R-25 R-26 R-27 R-28 R-29 R-30 R-31 R-32 S-22 S-23 S-24

Start Date 7/24/2017 7/24/2017 7/25/2017 7/25/2017 7/29/2017 7/29/2017 7/29/2017 7/29/2017 7/23/2017 7/23/2017 7/24/2017

Duration (hour) 0.52 0.5 0.41 0.52 0.54 0.53 0.5 0.5 0.52 0.52 0.41

Distance Fished (km) 2.85 2.74 2.14 2.85 2.94 2.81 2.72 2.72 2.88 2.9 2.16

Mid-Latitude (oN) 60.678 60.6715 60.67069 60.66409 60.68274 60.66608 60.66262 60.65229 60.98681 61.00397 60.99789

Mid-Longitude (oW) -173.45402 -174.12853 -174.79836 -175.46869 -176.21176 -176.79353 -177.50125 -178.16459 -171.49246 -172.15016 -172.78524

Bottom Depth (m) 66 86 98 108 119 130 147 160 59 63 67

Bottom Temperature (oC) -0.2 0.2 0.7 1.5 2.3 2.5 2.4 2.8 -1.3 -1.4 -0.4

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 69 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 1.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 72 0 1,438 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 890 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.41 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 182,393 151,768 155,355 1,657 515 215 0 137 126,624 75,167 387,664

 Mature males 0 586 3,552 3,589 1,804 1,433 72 0 0 0 0

 Legal 0 1,612 6,812 3,658 2,319 1,433 72 0 0 0 0

 Immature females 88,900 58,169 17,583 966 193 143 288 0 106,906 53,716 334,437

 Mature females 21,055 235,207 776,278 759 129 143 0 0 8,651 8,611 79,624

 Total weight (kg) 186.28 284.46 564.27 29.51 19.07 11.58 0.55 0.19 101.78 59.56 306.92

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

216

Station S-25 S-26 S-27 S-28 S-29 S-30 S-31 T-25 T-26 T-27 T-28

Start Date 7/24/2017 7/24/2017 7/24/2017 7/30/2017 7/29/2017 7/30/2017 7/30/2017 7/24/2017 7/24/2017 7/24/2017 7/30/2017

Duration (hour) 0.53 0.51 0.52 0.52 0.53 0.51 0.51 0.51 0.52 0.51 0.35

Distance Fished (km) 2.83 2.8 2.82 2.88 2.83 2.75 2.8 2.8 2.84 2.7 1.91

Mid-Latitude (oN) 60.99907 60.98571 60.99334 60.99689 61.00398 61.00992 60.98461 61.33153 61.33425 61.34522 61.3277

Mid-Longitude (oW) -173.51201 -174.18266 -174.86197 -175.55575 -176.2804 -176.99192 -177.66312 -173.58716 -174.33992 -175.00445 -175.62913

Bottom Depth (m) 76 83 92 103 112 122 136 74 78 87 97

Bottom Temperature (oC) -0.4 -0.2 0.6 1.4 1.9 2.3 2.3 -1.6 -1.6 0.1 0.8

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 337 70 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 69 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.55 0.31 0.00 0.24 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 278,543 595,346 162,224 8,026 481,534 215 69 272,553 307,414 270,043 152,445

 Mature males 0 148 1,375 7,554 7,807 3,150 208 136 200 766 1,354

 Legal 1,797 1,334 2,387 9,443 16,219 3,364 278 272 267 1,532 1,740

 Immature females 226,420 412,594 145,008 1,889 21,551 0 0 310,311 444,901 256,023 121,315

 Mature females 75,272 192,167 59,148 2,698 343,020 72 0 48,433 56,398 72,493 49,502

 Total weight (kg) 309.96 615.28 226.30 77.36 845.74 27.57 1.89 261.78 317.73 300.05 140.89

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 72 0 0 0 0 0

 Immature females 0 0 0 0 0 72 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.49 0.00 0.00 0.00 0.00 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

217

Station T-29 T-30 U-25 U-26 U-27 U-28 U-29 V-25 V-26 V-27 V-28

Start Date 7/30/2017 7/30/2017 7/31/2017 7/31/2017 7/30/2017 7/30/2017 7/31/2017 7/31/2017 7/31/2017 7/31/2017 7/31/2017

Duration (hour) 0.51 0.51 0.51 0.52 0.52 0.52 0.51 0.52 0.52 0.51 0.51

Distance Fished (km) 2.88 2.83 2.7 2.76 2.78 2.86 2.73 2.69 2.82 2.67 2.8

Mid-Latitude (oN) 61.33119 61.32375 61.66929 61.68018 61.68484 61.67748 61.64865 62.0047 61.99164 61.99858 61.99528

Mid-Longitude (oW) -176.328 -176.95856 -173.66956 -174.42111 -175.08354 -175.75841 -176.47592 -173.73871 -174.49703 -175.1881 -175.88704

Bottom Depth (m) 107 117 70 77 85 95 105 62 73 81 93

Bottom Temperature (oC) 1.2 1.8 -1.5 -1.6 -0.4 0.5 0.7 -1.5 -1.6 -1.3 0.2

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 71 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.12 0.00 0.00

Opilio Tanner Crab

 Immature males 3,935 5,732 446,656 180,183 173,207 71,704 50,492 353,033 14,595 125,878 112,252

 Mature males 4,625 1,468 0 0 270 1,648 2,071 0 0 218 1,145

 Legal 7,179 2,097 0 73 608 2,278 6,511 0 0 364 1,527

 Immature females 207 2,866 374,102 128,793 219,563 70,337 24,913 287,564 7,729 186,012 142,978

 Mature females 1,243 70 23,656 18,222 11,740 14,196 140,687 11,860 3,255 1,238 21,997

 Total weight (kg) 49.46 26.72 220.12 103.47 155.06 124.16 208.55 152.06 14.78 68.56 223.74

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 73 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

218

Station Z-05 D-09 D-10 E-09 F-10 F-11 F-12 G-10 G-11 G-12 G-13

Start Date 6/23/2017 8/11/2017 8/11/2017 8/11/2017 8/12/2017 8/12/2017 8/12/2017 8/12/2017 8/12/2017 8/13/2017 8/13/2017

Duration (hour) 0.61 0.52 0.5 0.53 0.52 0.51 0.52 0.53 0.52 0.52 0.52

Distance Fished (km) 3.27 2.85 2.68 2.82 2.81 2.74 2.73 2.77 2.75 2.7 2.67

Mid-Latitude (oN) 54.69783 55.99699 55.99879 56.33407 56.66352 56.64969 56.66341 57.00241 56.99842 56.99955 57.00389

Mid-Longitude (oW) -165.15024 -162.81605 -162.26074 -162.79977 -162.1808 -161.59291 -161.0238 -162.16726 -161.55005 -160.98217 -160.34472

Bottom Depth (m) 85 78 71 78 72 91 67 60 69 64 65

Bottom Temperature (oC) 6.1 3.3 5.3 1.9 3.3 3.4 5 4.1 3.8 4.4 5.5

Red King Crab

 Immature males 0 355 0 0 878 1,516 523 926 983 226 465

 Mature males 0 567 83 214 1,391 1,061 75 71 1,135 226 78

 Legal 0 213 83 214 1,098 985 0 0 1,059 151 78

 Immature females 0 71 0 0 439 455 299 285 681 0 310

 Mature females 0 1,986 1,743 71 3,293 1,516 971 4,488 1,210 528 931

 Total weight (kg) 0.00 62.63 37.89 9.51 127.13 77.01 22.92 95.69 86.74 16.83 20.61

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 587 355 249 712 439 152 75 214 303 75 155

 Mature males 65 426 249 1,639 293 2,350 1,420 214 1,059 0 776

 Legal 65 355 249 1,069 146 2,198 1,270 142 756 0 465

 Immature females 587 0 83 0 0 76 0 0 0 0 0

 Mature females 0 0 0 71 0 0 75 0 0 0 0

 Total weight (kg) 0.73 7.16 3.79 19.2 5.56 30.02 15.58 2.34 12.10 0.40 7.62

Opilio Tanner Crab

 Immature males 0

 Mature males 0

 Legal 0

 Immature females 0

 Mature females 0

 Total weight (kg) 0.00

Hybrid Tanner Crab

 Immature males 0

 Mature males 0

 Immature females 0

 Mature females 0

 Total weight (kg) 0.00
Appendix A: Tow details, crab density (number nmi-2

), and catch weight at 2017 eastern Bering Sea bottom trawl survey stations.

219

Station H-09 H-10 H-11 H-12 H-13 H-14 I-11 I-14 J-09 J-11

Start Date 8/14/2017 8/14/2017 8/14/2017 8/14/2017 8/13/2017 8/13/2017 8/15/2017 8/13/2017 8/10/2017 8/15/2017

Duration (hour) 0.51 0.52 0.51 0.52 0.52 0.51 0.51 0.52 0.51 0.52

Distance Fished (km) 2.67 2.64 2.77 2.87 2.91 2.78 2.81 2.83 2.86 2.83

Mid-Latitude (oN) 57.33199 57.33374 57.31429 57.32953 57.32494 57.33788 57.66527 57.66107 58.01648 57.99999

Mid-Longitude (oW) -162.74024 -162.14618 -161.54654 -160.92817 -160.30889 -159.67453 -161.46251 -159.63394 -162.75043 -161.48364

Bottom Depth (m) 49 50 56 64 62 56 54 50 40 55

Bottom Temperature (oC) 5.4 5.7 4.4 4.7 5.7 6.8 5 7.8 7.8 6.9

Red King Crab

 Immature males 161 575 846 718 71 0 387 0 0 155

 Mature males 161 739 461 790 214 0 387 0 75 155

 Legal 161 739 461 718 143 0 232 0 75 155

 Immature females 0 1067 461 144 71 0 77 0 0 0

 Mature females 6352 5910 692 1580 998 757 1162 0 75 387

 Total weight (kg) 126.20 140.71 40.55 69.13 26.66 14.68 31.76 0.00 5.85 14.68

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 246 77 287 356 0 77 149 0 387

 Mature males 0 492 385 574 428 151 77 0 75 309

 Legal 0 410 231 574 285 151 0 0 75 155

 Immature females 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 77

 Total weight (kg) 0.00 5.30 4.16 8.58 6.05 1.21 1.00 0.81 0.87 4.46
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

220

Station R-01 R-02 R-03 R-18 R-19 R-20 R-21 S-01 S-02 S-03 S-18

Start Date 9/2/2017 8/26/2017 8/16/2017 8/4/2017 8/4/2017 8/3/2017 8/3/2017 9/2/2017 8/26/2017 8/16/2017 8/4/2017

Duration (hour) 0.52 0.53 0.53 0.51 0.51 0.51 0.51 0.52 0.53 0.53 0.52

Distance Fished (km) 2.92 2.97 2.89 2.79 2.87 2.77 2.69 2.90 2.94 3.05 2.83

Mid-Latitude (oN) 60.6721 60.67349 60.66099 60.66639 60.67054 60.67508 60.67064 61.00562 60.99729 61.00993 60.99402

Mid-Longitude (oW) -168.01654 -167.31228 -166.65737 -168.7065 -169.37521 -170.05565 -170.75633 -168.03519 -167.32733 -166.67181 -168.71334

Bottom Depth (m) 29 26 20 37 43 49 58 30 23 20 36

Bottom Temperature (oC) 10.2 11.0 12.7 8.2 4.8 1.5 -0.7 9.3 10.8 11.9 8.7

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 79 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 79 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 1.94 0.71 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 0 0 0 0 4,165 0 304,593 0 0 0 0

 Mature males 0 0 0 0 0 0 78 0 0 0 0

 Legal 0 0 0 0 0 0 235 0 0 0 0

 Immature females 0 0 0 0 1,808 0 345,102 0 143 0 0

 Mature females 0 0 0 0 0 0 18,958 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 1.69 0.00 245.48 0.00 0.01 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 154

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

221

Station S-19 S-20 S-21 T-01 T-02 T-03 T-18 T-19 T-20 T-21 T-22

Start Date 8/4/2017 8/3/2017 8/3/2017 9/1/2017 8/26/2017 8/17/2017 8/4/2017 8/4/2017 8/3/2017 8/3/2017 8/2/2017

Duration (hour) 0.51 0.53 0.51 0.52 0.53 0.54 0.52 0.51 0.52 0.52 0.51

Distance Fished (km) 2.75 2.94 2.75 2.96 2.85 3.09 2.96 2.80 2.85 2.74 2.76

Mid-Latitude (oN) 60.99735 60.99503 61.00328 61.33972 61.34474 61.3304 61.33044 61.32645 61.33137 61.33543 61.3312

Mid-Longitude (oW) -169.43424 -170.13331 -170.81818 -168.0662 -167.37217 -166.91177 -168.74267 -169.45852 -170.1774 -170.84629 -171.5116

Bottom Depth (m) 41 48 53 30 24 21 34 40 47 49 55

Bottom Temperature (oC) 6.0 1.3 -0.6 6.8 10.4 11.8 8.9 4.4 -0.4 -0.7 -1.1

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 163 70 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 79 0 0 0 0 0 0 0

 Total weight (kg) 6.28 1.63 0.00 1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 245 0 374,499 0 0 0 0 156 471,728 719,459 206,841

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 245 0 338,908 0 0 0 0 78 321,302 485,714 138,848

 Mature females 0 0 20,182 0 0 0 0 0 0 14,467 6,974

 Total weight (kg) 0.10 0.00 236.42 0.00 0.00 0.00 0.00 0.02 275.33 389.83 121.80

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 224 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

222

Station T-23 T-24 U-01 U-02 U-03 U-18 U-19 U-20 U-21 U-22 U-23

Start Date 8/1/2017 8/1/2017 9/1/2017 8/26/2017 8/17/2017 8/15/2017 8/15/2017 8/3/2017 8/3/2017 8/2/2017 8/2/2017

Duration (hour) 0.51 0.34 0.52 0.53 0.54 0.52 0.51 0.52 0.51 0.51 0.52

Distance Fished (km) 2.86 1.79 2.90 2.93 3.04 2.85 2.87 2.83 2.64 2.73 2.74

Mid-Latitude (oN) 61.33567 61.34035 61.66796 61.67795 61.64634 61.6664 61.66581 61.673 61.67597 61.67415 61.65951

Mid-Longitude (oW) -172.25823 -172.93407 -168.0963 -167.4185 -166.74446 -168.80322 -169.50274 -170.221 -170.90997 -171.58834 -172.32618

Bottom Depth (m) 64 68 29 24 22 37 42 46 50 55 61

Bottom Temperature (oC) -1.4 -1.4 7.3 9.5 12.4 3.3 0.9 -0.5 -1.0 -1.3 -1.4

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 92,680 581,951 0 604 0 0 0 457,106 192,668 304,485 174,482

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 50,036 439,694 82 377 0 0 0 251,001 122,376 189,648 133,333

 Mature females 7,858 39,447 0 0 0 0 0 1,195 4,142 3,803 6,010

 Total weight (kg) 72.50 242.82 0.02 0.23 0.00 0.00 0.00 187.66 86.54 135.02 93.59

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

223

Station U-24 V-01 V-02 V-03 V-18 V-19 V-20 V-21 V-22 V-23 V-24

Start Date 8/1/2017 9/1/2017 9/1/2017 8/17/2017 8/15/2017 8/15/2017 8/16/2017 8/2/2017 8/2/2017 8/2/2017 8/1/2017

Duration (hour) 0.29 0.52 0.52 0.54 0.52 0.53 0.52 0.51 0.51 0.51 0.52

Distance Fished (km) 1.48 2.85 2.94 2.90 2.86 3.01 2.77 2.82 2.73 2.83 2.69

Mid-Latitude (oN) 61.66846 62.00126 62.00017 61.99927 61.99596 62.00914 62.00291 61.99606 61.99557 61.99573 62.00502

Mid-Longitude (oW) -173.03584 -168.126 -167.4425 -166.69886 -168.84087 -169.54835 -170.25688 -170.96093 -171.65183 -172.36478 -173.08487

Bottom Depth (m) 65 29 26 21 36 42 46 50 51 55 58

Bottom Temperature (oC) -1.5 6.8 7.9 11.8 0.8 -0.6 -0.9 -1.1 -1.1 -1.2 -1.5

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 84 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 2.41 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 497,211 507 231 0 974 58,451 289,519 224,210 339,550 325,308 536,532

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 417,901 760 385 0 524 34,385 178,776 159,396 191,127 180,910 433,712

 Mature females 30,205 0 0 0 0 270 1,228 1,015 2,239 2,007 14,842

 Total weight (kg) 133.27 0.21 0.17 0.00 0.55 21.45 96.46 94.43 112.53 113.04 225.58

Hybrid Tanner Crab

 Immature males 0 84 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

224

Station W-01 W-02 W-03 W-18 W-19 W-20 W-21 W-22 W-23 W-24 W-25

Start Date 8/31/2017 8/31/2017 8/17/2017 8/11/2017 8/15/2017 8/16/2017 8/2/2017 8/2/2017 8/2/2017 8/1/2017 8/1/2017

Duration (hour) 0.52 0.52 0.54 0.52 0.51 0.51 0.52 0.52 0.51 0.52 0.51

Distance Fished (km) 2.88 2.87 2.93 2.95 2.84 2.85 2.83 2.83 2.80 2.85 2.80

Mid-Latitude (oN) 62.33369 62.33883 62.3255 62.33254 62.33285 62.34174 62.33773 62.33721 62.33073 62.34322 62.34185

Mid-Longitude (oW) -168.15468 -167.43722 -166.72352 -168.87068 -169.59543 -170.28428 -171.05503 -171.7271 -172.44562 -173.17429 -173.88367

Bottom Depth (m) 31 27 22 35 37 40 43 48 54 60 64

Bottom Temperature (oC) 8.2 8.4 11.2 0.8 0.5 0.9 -0.5 -1.0 -1.4 -1.5 -1.6

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 2,015 818 0 2,200 477,880 54,468 139,589 1,566,290 833,342 454,027 64,507

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 581

 Immature females 483 654 0 587 292,935 40,211 72,715 934,270 620,515 323,375 18,701

 Mature females 0 0 0 0 3,506 80 3,564 0 0 11,467 17,875

 Total weight (kg) 0.44 0.22 0.00 0.67 222.58 17.13 61.10 405.23 297.42 186.44 55.76

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

225

Station W-26 W-27 X-01 X-02 X-03 X-18 X-19 X-20 X-21 X-22 X-23

Start Date 8/1/2017 8/1/2017 8/31/2017 8/31/2017 8/18/2017 8/11/2017 8/14/2017 8/16/2017 8/16/2017 8/17/2017 8/17/2017

Duration (hour) 0.51 0.52 0.51 0.52 0.54 0.52 0.54 0.53 0.52 0.50 0.51

Distance Fished (km) 2.76 2.81 2.86 2.88 2.74 2.87 3.05 3.04 2.86 2.73 2.82

Mid-Latitude (oN) 62.34029 62.33537 62.6582 62.66205 62.64254 62.66072 62.66808 62.67032 62.66837 62.66896 62.66936

Mid-Longitude (oW) -174.64544 -175.29846 -168.18624 -167.4697 -166.74871 -168.9003 -169.5996 -170.36448 -171.08539 -171.81505 -172.45574

Bottom Depth (m) 71 79 34 28 26 36 40 42 45 49 54

Bottom Temperature (oC) -1.6 -1.5 7.9 7.6 8.6 1.3 6.9 3.8 0.0 -0.9 -0.8

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 70 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.93 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 19,537 15,402 68,404 407 79 3,289,051 134,003 350 292 245,110 286,010

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 74 141 0 0 0 244 1,229 0 0 82 0

 Immature females 10,474 5,652 37,383 163 0 2,253,751 99,885 140 73 49,875 118,343

 Mature females 3,566 1,625 0 0 0 244 1,736 0 0 318 1,850

 Total weight (kg) 14.60 14.82 20.64 0.09 0.01 977.32 101.57 0.04 0.05 51.76 90.51

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

226

Station X-24 X-25 X-26 Y-01 Y-02 Y-03 Y-04 Y-18 Y-20 Y-21 Y-22

Start Date 8/18/2017 8/18/2017 8/18/2017 8/29/2017 8/29/2017 8/18/2017 8/18/2017 8/11/2017 8/14/2017 8/14/2017 8/17/2017

Duration (hour) 0.49 0.36 0.52 0.49 0.51 0.52 0.53 0.54 0.53 0.54 0.51

Distance Fished (km) 2.76 1.99 2.84 2.69 2.88 2.74 2.85 3.04 3.03 2.95 2.79

Mid-Latitude (oN) 62.66956 62.66693 62.67109 63.00573 62.99925 62.99165 63.00171 62.93308 62.94703 62.99627 63.00052

Mid-Longitude (oW) -173.18391 -173.9141 -174.63527 -168.22302 -167.48401 -166.75021 -166.03441 -168.98958 -170.46985 -171.11875 -171.79863

Bottom Depth (m) 64 69 73 40 34 28 21 30 42 47 53

Bottom Temperature (oC) -1.5 -1.5 -1.4 7.7 6.7 5.8 10.1 2.0 1.0 -0.4 -0.3

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 225 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.64 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 33,679 58,884 17,513 1,577 80 18,011 470 0 69 0 2,384

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 340 0 0 0 0 0 0 0 0 0

 Immature females 17,205 26,768 3,152 438 80 11,912 470 0 69 68 538

 Mature females 16,543 34,174 490 0 0 0 0 0 0 0 0

 Total weight (kg) 31.38 45.79 10.10 0.40 0.03 4.63 0.13 0.00 0.02 0.02 0.88

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

227

Station Y-23 Y-24 Y-25 ZZ-01 ZZ-02 ZZ-03 ZZ-04 ZZ-05 ZZ-21 ZZ-22 ZZ-23

Start Date 8/19/2017 8/19/2017 8/18/2017 8/29/2017 8/29/2017 8/25/2017 8/18/2017 8/19/2017 8/14/2017 8/17/2017 8/19/2017

Duration (hour) 0.52 0.50 0.50 0.52 0.52 0.53 0.53 0.53 0.53 0.32 0.52

Distance Fished (km) 2.90 2.73 2.77 2.90 2.87 2.98 2.87 2.71 2.90 1.70 2.95

Mid-Latitude (oN) 63.00844 62.99536 62.99291 63.32491 63.33061 63.30944 63.3369 63.32452 63.261 63.3188 63.32529

Mid-Longitude (oW) -172.60711 -173.23229 -174.00057 -168.24356 -167.50802 -166.78954 -166.02704 -165.34078 -171.11632 -171.91757 -172.69137

Bottom Depth (m) 61 68 74 27 33 26 23 16 34 60 65

Bottom Temperature (oC) -1.2 -1.5 -1.4 7.8 6.4 6.7 6.9 11.5 0.5 -0.3 -1.0

Red King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 71 0 0 0 0 0 0 157 0 0

 Mature males 0 0 0 0 0 0 0 0 78 0 0

 Legal 0 0 0 0 0 0 0 0 78 0 71

 Immature females 0 0 0 0 0 0 0 0 157 0 0

 Mature females 0 0 0 0 0 0 0 0 78 0 0

 Total weight (kg) 0.00 0.71 0.00 0.00 0.00 0.00 0.00 0.00 2.38 0.00 1.42

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 142

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.21

Opilio Tanner Crab

 Immature males 10,679 157,321 14,721 0 1,304 2,182 0 0 0 0 97,166

 Mature males 67 71 65 0 0 0 0 0 0 0 213

 Legal 67 282 262 0 0 0 0 0 0 0 213

 Immature females 5,306 95,661 654 83 734 1,382 0 0 0 0 57,510

 Mature females 2,619 25,665 6,935 0 0 0 0 0 0 0 13,942

 Total weight (kg) 13.36 108.86 20.04 0.01 0.43 1.06 0.00 0.00 0.00 0.00 69.24

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

228

Station ZZ-24 AA-01 AA-02 AA-03 AA-04 AA-05 AA-06 AA-07 AA-08 AA-10 AA-18

Start Date 8/19/2017 8/28/2017 8/28/2017 8/25/2017 8/24/2017 8/19/2017 8/19/2017 8/19/2017 8/20/2017 8/20/2017 8/27/2017

Duration (hour) 0.51 0.52 0.53 0.53 0.53 0.52 0.52 0.53 0.52 0.27 0.52

Distance Fished (km) 2.77 2.89 2.97 2.99 2.98 2.71 2.84 2.98 2.84 1.42 2.86

Mid-Latitude (oN) 63.33603 63.66954 63.66578 63.66339 63.67658 63.64831 63.68127 63.67011 63.66655 63.80437 63.67011

Mid-Longitude (oW) -173.41213 -168.278 -167.52785 -166.80781 -166.0585 -165.33659 -164.61319 -163.82735 -163.06016 -161.58552 -169.01404

Bottom Depth (m) 71 33 29 29 26 18 12 14 15 14 36

Bottom Temperature (oC) -1.1 6.5 5.8 4.7 5.5 10.8 11.4 12.7 13.4 10.6 6.5

Red King Crab

 Immature males 0 0 0 0 0 0 0 84 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 82 0 74 0 0 0 0 0 0

 Immature females 0 0 0 0 74 0 0 0 0 0 0

 Mature females 0 0 0 0 74 0 0 0 0 178 0

 Total weight (kg) 0.00 0.00 2.31 0.00 1.57 0.00 0.00 0.13 0.00 0.86 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 82 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.63 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 51,410 115,836 3,779 5,223 147 81 0 0 0 0 500,898

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 308 0 0 0 0 0 0 0 0 0 0

 Immature females 4,276 69,519 2,136 2,577 147 0 0 0 0 0 263,731

 Mature females 21,095 0 0 0 0 0 0 84 0 0 365

 Total weight (kg) 49.14 31.88 1.06 2.01 0.06 0.03 0.00 0.09 0.00 0.00 134.39

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

229

Station AA-19 AA-22 AA-23 BB-01 BB-02 BB-03 BB-04 BB-05 BB-06 BB-07 BB-08

Start Date 8/27/2017 8/20/2017 8/19/2017 8/28/2017 8/28/2017 8/25/2017 8/24/2017 8/24/2017 8/22/2017 8/22/2017 8/20/2017

Duration (hour) 0.51 0.32 0.52 0.52 0.52 0.50 0.54 0.52 0.52 0.52 0.52

Distance Fished (km) 2.89 1.67 2.89 2.82 2.88 2.81 3.00 2.74 2.98 2.70 2.73

Mid-Latitude (oN) 63.66607 63.69665 63.66968 64.00671 64.02824 63.99897 63.99298 64.01534 63.99465 64.00198 63.99646

Mid-Longitude (oW) -169.75383 -172.10453 -172.73402 -168.29421 -167.56579 -166.8175 -166.05167 -165.31265 -164.54535 -163.79239 -163.06261

Bottom Depth (m) 40 40 57 36 37 33 22 18 18 19 20

Bottom Temperature (oC) 7.7 2.5 1.5 5.6 4.8 4.1 6.5 8.9 11.9 12.7 11.8

Red King Crab

 Immature males 0 0 0 0 0 0 305 93 0 0 446

 Mature males 0 0 0 0 0 0 0 186 0 0 0

 Legal 0 0 0 0 89 430 152 93 0 0 0

 Immature females 0 0 0 0 0 0 76 0 0 0 891

 Mature females 0 0 0 0 0 0 0 0 79 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 1.22 8.54 5.71 3.35 0.68 0.00 0.24

Blue King Crab

 Immature males 0 403 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 134 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 1.60 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Bairdi Tanner Crab

 Immature males 82 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 164 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 11,399 18,521 124,481 647,115 328,164 3,443 1,219 1,211 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 13,203 8,321 42,133 234,636 127,909 1,076 1,066 373 0 0 0

 Mature females 82 134 23,073 0 0 0 0 0 0 0 0

 Total weight (kg) 1.70 6.70 116.22 116.89 64.61 0.72 0.72 0.34 0.00 0.00 0.00

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

230

Station BB-09 BB-10 BB-18 BB-19 BB-20 BB-21 BB-22 CC-01 CC-02 CC-03 CC-04

Start Date 8/20/2017 8/21/2017 8/27/2017 8/27/2017 8/21/2017 8/20/2017 8/20/2017 8/26/2017 8/24/2017 8/23/2017 8/23/2017

Duration (hour) 0.52 0.51 0.52 0.51 0.53 0.46 0.51 0.51 0.29 0.52 0.53

Distance Fished (km) 2.72 2.92 2.84 2.85 2.91 2.54 2.83 2.81 1.56 2.80 2.80

Mid-Latitude (oN) 64.00461 63.99105 64.0077 63.99308 63.99409 64.04452 63.99919 64.32915 64.32386 64.34015 64.33107

Mid-Longitude (oW) -162.33381 -161.53304 -169.05261 -169.79379 -170.55932 -171.3584 -172.02633 -168.33552 -167.57616 -166.83257 -166.05974

Bottom Depth (m) 18 18 35 35 30 33 54 40 31 30 23

Bottom Temperature (oC) 8.1 7.1 5.8 7.3 6.4 5.1 1.2 4.2 3.8 4.5 5.2

Red King Crab

 Immature males 698 0 0 0 0 0 0 0 0 311 82

 Mature males 0 0 0 0 0 0 0 0 0 233 0

 Legal 87 0 0 0 0 0 0 0 0 622 0

 Immature females 1,134 0 0 0 0 0 0 0 0 78 0

 Mature females 174 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 2.92 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 14.41 0.39

Blue King Crab

 Immature males 0 0 0 410 1,209 195 1,824 0 0 0 82

 Mature males 0 0 0 82 806 0 397 0 0 0 82

 Legal 0 0 0 164 564 97 0 0 0 78 82

 Immature females 0 0 0 82 726 0 2,538 0 0 0 0

 Mature females 0 0 0 492 2,419 876 476 0 141 0 0

 Total weight (kg) 0.00 0.00 0.00 11.56 60.18 8.18 19.62 0.00 0.71 1.70 4.00

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 0 0 4,616 28,786 861,187 37,516 49,236 80,044 23,660 778 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 2,397 17,330 689,734 13,803 56,839 35,239 13,097 544 82

 Mature females 0 0 0 164 0 292 8,024 168 0 0 0

 Total weight (kg) 0.00 0.00 1.04 11.93 313.40 12.38 43.41 23.11 2.56 0.16 0.02

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

231

Station CC-05 CC-06 CC-07 CC-08 CC-09 CC-10 CC-18 CC-19 CC-20 CC-21 DD-01

Start Date 8/24/2017 8/22/2017 8/22/2017 8/21/2017 8/21/2017 8/21/2017 8/27/2017 8/21/2017 8/21/2017 8/21/2017 8/26/2017

Duration (hour) 0.53 0.52 0.52 0.52 0.52 0.52 0.51 0.35 0.52 0.25 0.51

Distance Fished (km) 2.76 2.75 2.83 2.82 2.78 2.91 2.78 1.96 2.86 1.30 2.90

Mid-Latitude (oN) 64.3323 64.32803 64.33843 64.24653 64.33141 64.31027 64.29345 64.31149 64.27813 64.30688 64.65996

Mid-Longitude (oW) -165.33609 -164.53456 -163.78699 -163.1185 -162.26691 -161.53698 -169.13892 -169.82966 -170.69045 -171.27471 -168.35471

Bottom Depth (m) 25 15 19 20 19 15 40 39 35 45 40

Bottom Temperature (oC) 8.4 12.9 11.1 8.4 7.4 10.1 5.3 4.1 6.6 2.1 2.8

Red King Crab

 Immature males 0 0 1,026 0 414 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 83 0 171 0 0 0 0 0 0 0 0

 Immature females 0 0 85 82 166 0 0 0 0 0 0

 Mature females 0 0 256 0 0 0 0 0 0 0 0

 Total weight (kg) 1.37 0.00 7.86 0.00 0.08 0.00 0.00 0.00 0.00 0.00 0.00

Blue King Crab

 Immature males 0 0 0 0 0 0 175 125 172 0 0

 Mature males 0 0 0 0 0 0 0 0 0 187 0

 Legal 0 0 0 0 0 0 0 125 429 0 0

 Immature females 0 0 0 0 0 0 0 125 0 933 0

 Mature females 0 0 0 0 0 0 0 125 172 187 162

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 1.64 3.29 9.69 3.96 0.94

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 743 0 85 0 0 0 159,037 2,744 79,910 452,264 14,496

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 639 0 0

 Immature females 165 0 0 0 0 0 82,430 1,497 77,022 351,669 6,074

 Mature females 0 0 0 0 0 0 87 0 0 1,511 0

 Total weight (kg) 0.23 0.00 0.01 0.00 0.00 0.00 39.06 0.75 38.13 70.56 3.02

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

232

Station DD-02 DD-03 DD-18 DD-19 DD-20 EE-01 EE-02 EE-18 EE-19 FF-01 FF-02

Start Date 8/25/2017 8/23/2017 8/26/2017 8/22/2017 8/22/2017 8/26/2017 8/25/2017 8/22/2017 8/22/2017 8/25/2017 8/25/2017

Duration (hour) 0.52 0.53 0.53 0.53 0.27 0.53 0.52 0.52 0.52 0.51 0.52

Distance Fished (km) 2.90 2.89 2.92 2.87 1.46 2.88 2.97 2.86 2.88 2.82 2.92

Mid-Latitude (oN) 64.70436 64.65558 64.65126 64.65624 64.61832 65.00093 64.97021 65.01722 65.00784 65.32591 65.25698

Mid-Longitude (oW) -167.60711 -166.80792 -169.16212 -169.90891 -170.68775 -168.34499 -167.60049 -169.12043 -169.91102 -168.36981 -167.86932

Bottom Depth (m) 30 25 43 47 47 44 33 49 50 53 33

Bottom Temperature (oC) 4.7 3.9 2.9 3.1 2.6 3.2 3.4 4.0 3.0 3.7 3.4

Red King Crab

 Immature males 0 229 0 0 0 0 1,421 0 0 0 163

 Mature males 0 76 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 1,342 0 0 0 81

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 1.02 0.00 0.00 0.00 0.00 1.46 0.00 0.00 0.00 0.46

Blue King Crab

 Immature males 0 76 0 74 871 0 0 0 74 0 0

 Mature males 0 0 72 0 145 0 0 0 0 156 0

 Legal 0 0 0 0 145 78 0 0 0 0 0

 Immature females 0 0 0 0 581 156 79 0 74 312 0

 Mature females 0 76 0 0 0 156 79 0 0 0 81

 Total weight (kg) 0.00 2.19 1.00 0.82 7.68 4.21 0.86 0.00 0.91 4.80 1.33

Bairdi Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Legal 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Opilio Tanner Crab

 Immature males 4,650 764 649 967 302,858 1,948 237 994 3,606 79,366 325

 Mature males 0 0 0 0 0 0 0 76 0 0 0

 Legal 0 0 0 74 0 0 0 76 74 0 0

 Immature females 2,134 993 72 298 119,528 1,091 0 153 1,030 35,881 0

 Mature females 0 0 0 74 256 0 0 76 147 234 0

 Total weight (kg) 0.80 0.03 0.38 0.60 43.3 1.44 0.02 1.38 2.42 31.24 0.06

Hybrid Tanner Crab

 Immature males 0 0 0 0 0 0 0 0 0 0 0

 Mature males 0 0 0 0 0 0 0 0 0 0 0

 Immature females 0 0 0 0 0 0 0 0 0 0 0

 Mature females 0 0 0 0 0 0 0 0 0 0 0

 Total weight (kg) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Appendix B: Tow details, crab density (number nmi-2

), and catch weight at 2017 northern Bering Sea bottom trawl survey stations.

233

Station FF-18

Start Date 8/22/2017

Duration (hour) 0.52

Distance Fished (km) 2.83

Mid-Latitude (oN) 65.21764

Mid-Longitude (oW) -168.89474

Bottom Depth (m) 54

Bottom Temperature (oC) 4.0

Red King Crab

 Immature males 0

 Mature males 0

 Legal 0

 Immature females 0

 Mature females 0

 Total weight (kg) 0.00

Blue King Crab

 Immature males 163

 Mature males 0

 Legal 0

 Immature females 81

 Mature females 163

 Total weight (kg) 1.92

Bairdi Tanner Crab

 Immature males 0

 Mature males 0

 Legal 0

 Immature females 0

 Mature females 0

 Total weight (kg) 0.00

Opilio Tanner Crab

 Immature males 7,972

 Mature males 0

 Legal 0

 Immature females 813

 Mature females 244

 Total weight (kg) 6.17

Hybrid Tanner Crab

 Immature males 0

 Mature males 0

 Immature females 0

 Mature females 0

 Total weight (kg) 0.00

RECENT TECHNICAL MEMORANDUMS

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National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22167 

(web site: www.ntis.gov). Paper and electronic (.pdf) copies vary in price. 

AFSC371 RODGVELLER, C. J., K. B. ECHAVE, P-J. F. HULSON, and K. M. COUTRÉ. 2018. Age-atmaturity and fecundity of female sablefish sampled in December of 2011 and 2015 in the Gulf of 

Alaska, 31 p. NTIS number pending.

370 GUTHRIE, C. M. III, HV. T. NGUYEN, A. E. THOMSON, K. HAUCH, and J. R. GUYON. 2018. 

Genetic stock composition analysis of the Chinook salmon bycatch samples from the 2016 Gulf 

of Alaska trawl fisheries, 226 p. NTIS number pending.

369 SHELDEN, K. E. W., K. T. GOETZ, R. C. HOBBS, L. K. HOBERECHT, K. L. LAIDRE, 

B. A. MAHONEY, T. L. MCGUIRE, S. A. NORMAN, G. O’CORRY-CROWE, D. J. VOS, 

G. M. YLITALO, S. A. MIZROCH, S. ATKINSON, K. A. BUREK-HUNTINGTON, and C. 

GARNER. 2018. Beluga whale, Delphinapterus leucas, satellite-tagging and health assessments 

in Cook Inlet, Alaska, 1999 to 2002, 226 p. NTIS No. PB2018-100721.

368 FRITZ, L., K. CHUMBLEY, R. TOWELL, K. LUXA, and J. CUTLER. 2018. Short-term survival 

rates of branded Steller sea lion pups, 33 p. NTIS No. PB2018-100686.

367 STRASBURGER, W. W., J. H. MOSS, K. A. SIWICKE, E. M. YASUMIISHI, A. I. PINCHUK, and 

K H. FENSKE. 2018. Eastern Gulf of Alaska ecosystem assessment, July through August 2017, 

105 p. NTIS No. PB2018-100602.

366 WHITTLE, J. A., C. M. KONDZELA, HV. T. NGUYEN, K. HAUCH, D. CUADRA, 

and J. R. GUYON. 2018. Genetic stock composition analysis of chum salmon from the prohibited 

species catch of the 2016 Bering Sea walleye pollock trawl fishery and Gulf of Alaska groundfish 

fisheries, 56 p. NTIS No. PB2018-100474.

365 GUTHRIE, C. M. III, HV. T. NGUYEN, A. E. THOMSON, K. HAUCH, and J. R. GUYON. 2018. 

Genetic stock composition analysis of the Chinook salmon (Oncorhynchus tshawytscha) bycatch 

from the 2016 Bering Sea walleye pollock (Gadus chalcogrammus) trawl fishery, 32 p. NTIS No. 

PB2018-100476.

364 SULLIVAN, J., and C. FAUNCE. 2018. Alternative sampling designs for the 2018 Annual 

Deployment Plan of the North Pacific Observer Program, 30 p. NTIS No. PB2018-100475.

363 STRASBURGER, W. W., J. H. MOSS, K. A. SIWICKE, and E. M. YASUMIISHI. 2018. Results 

from the eastern Gulf of Alaska ecosystem assessment, July through August 2016, 90 p. NTIS 

No. PB2018-100430.

362 ORR, A. J., J. D. HARRIS, K. A. HIRSCHBERGER, R. L. DELONG, G. S. SANDERS, and 

J. L. LAAKE 2017. Qualitative and quantitative assessment of use of offshore oil and gas 

platforms by the California sea lion (Zalophus californianus), 72 p. NTIS No. PB2018-100078.

361 MCCONNAUGHEY, R. A., K. E. BLACKHART, M. P. EAGELTON, and J. MARSH. 2017. Habitat 

assessment prioritization for Alaska stocks: Report of the Alaska Regional Habitat Assessment 

Prioritization Coordination Team, 102 p. NTIS No. PB2018-100160.