NOAA Technical Memorandum NMFS-AFSC-235
 

The 2011 Eastern Bering Sea

Continental Shelf Bottom Trawl Survey: 

Results for Commercial Crab Species 

by

E. A. Chilton, C. E. Armistead, and R. J. Foy 

U.S. DEPARTMENT OF COMMERCE 

National Oceanic and Atmospheric Administration

National Marine Fisheries Service
 

Alaska Fisheries Science Center
 

May 2012 
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: 

Chilton, E. A., C. E. Armistead, and R. J. Foy. 2012. The 2011 Eastern 

Bering Sea continental shelf bottom trawl survey: Results for 

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

NMFS-AFSC-235, 118 p. 

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

the National Marine Fisheries Service, NOAA. 
NOAA Technical Memorandum NMFS-AFSC-235
 

The 2011 Eastern Bering Sea

Continental Shelf Bottom Trawl Survey: 

Results for Commercial Crab Species
 

by

E. A. Chilton, C. E. Armistead, and R. J. Foy 

Alaska Fisheries Science Center

 Kodiak Laboratory
 

301 Research Court
 

Kodiak, AK 99615-7400
 

www.afsc.noaa.gov

U.S. DEPARTMENT OF COMMERCE 

John E. Bryson, Secretary 

National Oceanic and Atmospheric Administration

 Jane Lubchenco, Under Secretary and Administrator 

National Marine Fisheries Service 

Samuel D. Rauch III, Acting Assistant Administrator for Fisheries 

May 2012 
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 
 

 

 

 

 

 

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. In 2011, 376 standard stations were sampled on the eastern 

Bering Sea shelf and 20 stations were resampled in Bristol Bay at the end of the standard survey 

to account for female red king crab maturity. The 2011 biomass estimates reported in metric tons 

(t) and pounds (lb) with 95% confidence intervals (± 1.96 SE) for legal-sized males of 

commercial crab stocks in the eastern Bering Sea were as follows: 

Commercial Crab Species 

Bristol Bay District red king crab

 (Paralithodes camtschaticus) 

2011 Legal-sized Male 

15,412 (5,238) t 

 Biomass (± 95% CI) * 

33,977,299.61 

(11,547,788.81) lb 

Pribilof District red king crab

 (P. camtschaticus) 

3,751 (4,787) t 8,269,046.58 

(10,554,038.49) lb 

Pribilof District blue king crab

 (P. platypus) 

399 (693) t 879,573.20 

(1,528,179.24) lb 

St. Matthew Island Section blue king 

crab (P. platypus) 

5,788 (5,555) t 12,759,351.83 

(12,246,469.72) lb 

Southern Tanner crab (Chionoecetes 

bairdi), east 166° W 

10,207 (5,880) t 22,503,103.69 

(12,964,143.55) lb 

Southern Tanner crab, east 166° W 

≥ 5.5 inches 

5,356 (4,344) t 11,807,249.93 

(10,109,706.61) lb 

Southern Tanner crab, west 166° W 23,278 (16,729) t 51,319,174.78 

(36,880,898.03) lb 

Southern Tanner crab, west 166° W 

≥ 5.0 inches 

15,676 (13,672) t 34,560,932.62 

(35,029,759.51) lb 

Snow crab, all Districts (C. opilio) 146,297 (32,652) t 322,525,931.00 

(71,984,466.52) lb 

Snow crab, all Districts 

≥ 4.0 inches 

94,763 (22,025) t 208,915,452.54 

(48,556,399.29) lb 

* Differences in metric ton biomass estimates compared to pound biomass estimates are due to 

rounding errors. 

iii 
 

 


 
 

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 .............................................................................................................. 4
 

RESULTS ....................................................................................................................................... 6
 

Survey Overview ......................................................................................................................... 6
 

Bristol Bay District Red King Crab............................................................................................. 7
 

Pribilof District Red King Crab................................................................................................... 9
 

Pribilof District Blue King Crab................................................................................................ 10
 

St. Matthew Island Section, Northern District Blue King Crab ................................................ 10
 

Tanner Crab ............................................................................................................................... 11
 

Snow Crab ................................................................................................................................. 12
 

Chionoecetes bairdi/opilio hybrid ............................................................................................. 14
 

Other Crab Stocks and Species of Interest ................................................................................ 14
 

Northern District Red King Crab ........................................................................................... 14
 

Northern District Blue King Crab .......................................................................................... 14
 

Hair Crab................................................................................................................................ 15
 

v 
ACKNOWLEDGMENTS ............................................................................................................ 15 

CITATIONS ................................................................................................................................. 16 

Appendix A: Standard Survey Station Details............................................................83 

vi 
 

INTRODUCTION
 

Survey History and Purpose 

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

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

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

1975, annual surveys have been conducted and were expanded to include Bristol Bay along with 

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

resource impacts of offshore oil development (Pereyra et al. 1976). 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 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 will be referred to as Tanner crab in this document. 

Since 1988, 376 standard stations have been included in the survey covering a 140,350 square 

nautical mile (nmi2

) area of the EBS with station depths ranging from 20 to 150 m (Fig. 1). The 

annual EBS bottom trawl survey begins in the northeast section of Bristol Bay in early June and 

approximately 10 to 12 stations are sampled each day from two vessels. The standard survey is 

completed in late July at the western edge of the survey grid, northwest of St. Matthew Island. In 

some years when the reproductive cycle of red king crab 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 Results: Bristol Bay District Red King Crab section). 

Between 1994 and 2010, a survey station producing  100 legal-sized red king or Tanner crab 

males has been considered a “hot spot”. At each hot spot, additional tows were made within the 

station area and all crab species caught were sampled identical to the standard survey tow 

protocol described in the Methods section. In 2011, there were no stations with  100 legal-sized 

red king crab and only one station, G-21, with ≥ 100 legal-sized Tanner crab. 

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 1998). The annual stock assessment and fishery 

evaluation (SAFE) report prepared by the North Pacific Fishery Management Council’s Crab 

Plan Team provides current biological, ecosystem, and economic data associated with these 

species. NMFS determines the procedure for setting overfishing levels and allowable biological 

catch while ADF&G sets the annual total allowable catch or guideline harvest level for each crab 

stock. Currently, the Crab Plan Team and the Council’s Scientific and Statistical Committee 

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 (Bowers et al. 2010). Red king 

crab are split into Bristol Bay and Pribilof Islands stocks, 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 2011 survey results for commercially important crab resources in the 

EBS. The results of the 2011 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., Lauth 2010). 

METHODS 

Survey Area and Sampling Logistics 

The 2011 standard survey was conducted onboard the chartered fishing vessels FV Alaska 

Knight and FV Aldebaran, beginning 5 June in Bristol Bay and moving westward to end at 

station K-27 on 25 July. The vessels sampled in close proximity during the standard survey, with 

both vessels returning to Bristol Bay to resample 20 stations between 25 and 31 July. 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 districts, which are defined by ADF&G commercial 

crab management units (Fig. 2). Management units are defined by registration areas and districts, 

which are further divided into strata with standard or high station densities. Standard-density 

strata have stations centered in 20  20 nmi (37.04  37.04 km) cells while high-density strata 

include additional stations at the corners of the 20  20 nmi cells. Total area calculations for each 

stock strata uses an area of 401 nmi2

 for each 20  20 nmi cell due a spherical projection of the 

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 within the 

stratum. The king crab Registration Area Q in the Bering Sea is 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 

stratum for the St. Matthew Island Section of the Northern District is divided into two sampling 

areas: 1) a high-density 7,218 nmi2 area with 28 stations and 2) a standard-density 12,431 nmi2 

area with 29 stations creating a total of 57 stations within the St. Matthew Island Section stratum. 

The stratum of the Pribilof District is divided into two sampling areas: 1) a high-density 10,025 

nmi2 area with 41 total stations and 2) a standard-density 14,436 nmi2 area with 36 stations 

creating a total of 77 stations within the stratum. 

The fishing gear used in 2011 was identical to that of previous EBS annual bottom trawl 

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

(25.3 m) headrope and a 112 ft (34.1 m) footrope (Lauth 2010). The trawls on each vessel were 

rotated every 25-30 consecutive tows to mitigate potential impacts from changes in net 

2 
 

 

configuration due to fishing. Each tow was approximately 0.5 h in duration and 1.5 nmi (2.8 km) 

in length at a speed of 3 knots (1.54 m/sec) and conducted in strict compliance with NMFS 

bottom trawl protocols established by the National Oceanic and Atmospheric Administration 

(Stauffer 2004). 

Net mensuration equipment was used to monitor the net’s fishing performance during each tow 

(Lauth 2010). 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 consisted of 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. The bottom contact of 

the footrope and GPS data were used 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 Seabird 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 this data by adding the 

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

Biological Data Collection 

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 rostrum horns (Karinen and Hoopes 1971, Urban et al. 2002). Subsampling 

of the total catch occurred when an exceptionally large number (>300) of a species was caught in 

a tow. The 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 (± 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 all king crab and hair crab (Donaldson and Byersdorfer 

2005). 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). 

All female crab abdomens were evaluated to determine reproductive condition based on 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), the condition of the eggs (0 = no eggs, 1 = uneyed, 2 = eyed, 3 = dead, 4 = empty 

egg cases), and color of the eggs (0 = no eggs, 2 = purple, 3 = brown, 4 = orange, 5 = purplebrown, 6 = pink). 

Egg clutch and egg condition codes were used to assess the stage in the molt-mate cycle of 

mature female red king crab during the survey, where the presence of eyed embryos, empty egg 

cases, or absence of eggs (barren, hereafter) in mature-sized females were indications of an 

3 
 

 

incomplete cycle while mature females brooding uneyed embryos indicated completion of the 

cycle. The ratio of females with eyed embryos, empty egg cases, and old shell barren to uneyed 

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

Chela height and carapace width measurements (± 0.1 mm) were collected from a subsample of 

male Chionoecetes spp. crab caught at each station to determine morphometric molt to functional 

maturity based on the chela height to carapace width ratio (Stevens et al. 1993, Tamone et al. 

2007). Functional maturity in male Chionoecetes spp. can be separated into two morphometric 

groups, small claw and large claw based on the frequency distribution of the chela height to 

carapace width ratio in the large and small claw categories (Tamone et al. 2007). 

All crab carapaces were scanned for evidence of bitter crab syndrome or black mat fungus and 

recorded when present. Crabs with bitter crab syndrome were set aside for further testing by the 

Fisheries Resource Pathology Laboratory at the AFSC in Seattle, WA. 

Crab Biomass Estimates 

Crab density (number/nmi2

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

well as mature and immature males and females of each stock (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. In this document, 

population biomass estimates are calculated using the variable net width based on net 

mensuration data. 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. 3), and changes with the depth of the tow due 

to changes in scope of the trawl wire (Rose and Walters 1990). For 2011 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 present, the net width is 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. 3). Distance traveled by the trawl was determined from ship positions 

recorded at the beginning and end of each tow using GPS equipment. 

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

individual male and female crab species at each 1 mm size category using the weight-size 

relationships developed by the AFSC Kodiak Laboratory (Table 3). The weight-size 

relationships are described by the expression: 

 W= a Lb 

4 
 

 

 

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. 

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 

stations within the defined district or section stratum and multiplied 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 metric tons and pounds are reported. Metric tons can be converted to pounds by 

multiplying the biomass in tons by 2,204.62 for comparison with ADF&G reported values of 

total allowable catch (TAC) and guideline harvest levels (GHL). Differences in metric ton 

biomass estimates compared to pound biomass estimates are due to rounding errors. 

In the Bristol Bay District, two tows were completed at A-04 due to the final position of the Z-04 

tow which only has limited area within the trawlable depth range. At stations with multiple tows 

(i.e., station A-04), a single estimate of crab density was used by averaging all tows within the 

station prior to calculating total crab biomass. 

In years with colder than average bottom water temperatures, (1999, 2000, and 2006 - 2010) a 

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

resampled in late July to accurately assess the percentage of ovigerous red king crab females 

which had extruded a new clutch of uneyed embryos. In 2011, 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 encountered 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 2011 total population 

estimates for Bristol Bay red king crab males were calculated by averaging data collected at the 

original stations in early June with data collected at the 20 resample stations in late July. Bristol 

Bay female red king crab biomass estimates were calculated by replacing data collected at the 

original stations with data collected at the resample stations due to crab 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. However, for consistent analyses and due to a lack 

of available data, catchability is assumed to be near or equal to one. 

5 
 

 

RESULTS 

Survey Overview 

The 2011 EBS bottom trawl survey consisted of 396 bottom trawls (376 standard survey stations, 

and 20 resampled stations in Bristol Bay) conducted from 5 June to 31 July over an area of 

approximately 140,350 nmi2

 beginning in the northeast corner of Bristol Bay, moving northwest 

of St. Matthew Island and following the slope edge south to finish on 25 July at station K-27. 

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 Appendix A. 

The mean distance fished was 1.50 nmi (2.79 km, SD = 0.16 nmi) with a range of 0.54 to 1.87 

nmi (1.00 to 3.46 km) and the mean fishing time was 30.5 minutes (SD = 3.1 min). The fishing 

depth of the 83-112 Eastern otter trawl ranged from 18 to 170 m with a mean gear depth of 

77.5 m (SD = 33.4 m). The mean net width per tow ranged from 13.3 to 19.2 m and the average 

mean net width for all 396 successful tows was 16.4 m with a standard deviation of 0.9 m. 

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

6.5°C (Fig. 4). A cold pool of water < 2°C extended onto the middle shelf between the 50 and 

100 m isobaths and into the western edge of Bristol Bay with cool temperatures persisting 

northeast of the Pribilof Islands. Warmer bottom temperatures were evident between the 100 and 

200 m isobaths in the southwestern area of the survey area, at the nearshore stations along the 

Alaska Peninsula, and in shallow waters surrounding Nunivak Island. Cooler water temperatures 

persisted in the northwestern area between the 100 and 200 m isobaths and the waters 

surrounding St. Matthew Island. In 2011, the average mean bottom water temperature during the 

first survey leg (5 to 19 June 2011) was 2.6°C (SD = 1.0) which was warmer than the average 

mean bottom water temperature during the same time period in 2010 at 1.8°C (SD = 1.6) and in 

2009 at 1.5°C (SD = 0.5), as well as 1.4°C (SD = 0.7) in 2008 and 1.8°C (SD = 0.9) in 2007. The 

mean bottom water temperatures at the 20 stations resampled in July ranged from 4.2°C to 

7.7°C, with an average of 5.9°C (SD = 1.1) (Fig. 5). 

The time series of mature male biomass, beginning in 1975, for six of the current commercial 

crab stocks highlights the fluctuations of each stock over the last 30 years with relative increases 

beginning in 2001 after a precipitous decline from 1997 to 2000 (Fig. 6). 

Nine special projects were conducted in addition to the assessment survey to collect specific 

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

AFSC Shellfish Assessment Program: 1) investigate the effects of ocean acidification on the 

maternal condition and reproductive success as well as larval condition and survival in red king 

crab, 2) examine Chionoecetes spp. stomach contents, 3) collect specimens with rare or unusual 

pathological conditions, 4) collect hemolymph samples from Paralithodes, Hyas, Pagurus, and 

Elassochirus spp., and E. isenbeckii at randomly selected stations to monitor bitter crab 

syndrome and for population genetics, 5) define genetic population structure in EBS blue king 

crab, 6) investigate the effects of cold temperatures on crab survival using reflex assessment 

model predictor, 7) collect paired photographic and genetic documentation from Chionoecetes 

hybrid crab, and 8) evaluate adult and juvenile red king crab distribution at nearshore stations 

6 
 

 

 

along the Alaska Peninsula. Data for an additional project were collected to evaluate sperm 

reserves and clutch fullness in Chionoecetes spp. as indicators of reproductive potential for 

ADF&G. 

A total of 55 live female red king crab with newly extruded embryos were collected and returned 

to the AFSC Kodiak Laboratory to measure the effects of ocean acidification on embryo 

viability, embryo development, hatching success, fecundity, and maternal condition, as well as 

the condition and survival of larvae. Over 200 stomachs from both male and female Tanner and 

snow crab were collected to investigate the diet of these species. Hemolymph samples were 

collected from 278 P. camtschaticus, 53 Hyas lyratus, 330 H. coarctatus, 81 Pagurus spp., 6 

Elassochirus cavimanus, 178 E. isenbeckii, and 110 Telmessus cheiragonus to monitor bitter 

crab syndrome. One hundred and seventeen hemolymph samples were also collected from both 

Pribilof Islands and St. Matthew Island blue king crab for population genetics and to monitor 

bitter crab syndrome. One hundred male snow crab were collected to investigate the effect of 

cold temperatures on crab metabolism and reflexes. One hundred and twenty hemolymph 

samples along with morphometric photographs were collected from Chionoecetes hybrid crab. 

Nine survey stations were added to the standard survey design to assess adult and juvenile red 

king crab distribution in the nearshore waters of Bristol Bay. All collections were completed 

within the guidelines stipulated by the ADF&G collection permit for each project. 

Bristol Bay District Red King Crab 

Red king crab were caught at 65 of the 156 stations in the Bristol Bay management district in 

2011. The density of legal-sized male crab caught at a station ranged from 73 to 1,894 crab/nmi2 

(Appendix A). Legal-sized male Bristol Bay red king crab were caught at 56 stations (Table 5, 

Appendix A), resulting in a total biomass estimate (± 95% CI) of 15,412 ± 5,238 t in the Bristol 

Bay District (Table 6). The majority of these males were concentrated in the central and 

southwest section of Bristol Bay along the Alaska Peninsula (Figs. 7 and 8). The 2011 estimated 

biomass of legal-sized males is lower than the 20 year average of 24,464 ± 11,814 t (Table 6). 

Red king crab mature males were encountered at 65 of the 156 surveyed stations; 136 Bristol 

Bay district stations and 20 resample stations (Fig. 9). One hundred percent of the 417 mature 

males caught were measured, while 43% of the 1,295 immature male red king crab caught were 

measured (Table 5). The estimated biomass of 19,599 ± 6,024 t for mature males represents 46% 

of the total male biomass in 2011 (Table 6) with immature male red king crab representing the 

remaining balance of 7,864 ± 5,517 (Table 5). The majority of both size categories were 

centrally located in the Bristol Bay District, with a high number of immature males caught at 

station G-15 in the nearshore waters of northeastern Bristol Bay (Figs. 7 and 8). 

The male red king crab caught in 2009 from 125 mm to 135 mm CL grew to 140 mm to 150 mm 

CL in 2010 and 165 mm to 175 mm CL in 2011. In 2011 this cohort made up the old and very 

old shell condition classes. Juvenile recruitment appeared as the 40 mm to 50 mm CL size 

category in 2011 (Fig. 10). In 2011, 79% legal-sized male were hardshell crabs and 21% were 

oldshell and very oldshell crabs with the majority of oldshell males caught in central Bristol Bay 

and at depths of 50 m or less (Fig. 11). 

7 
 

 

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 (Shirley et al. 1990, Stevens and Swiney 2007, Chilton et al. 2010). A delay in the 

molting and mating cycle is apparent at the beginning of the EBS bottom trawl survey by high 

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

the previous season, or with pleopods exhibiting empty egg cases. 

During years with colder than average bottom temperatures, (1999, 2000, and 2006 - 2010) the 

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

compared to years with warmer bottom temperatures (2001-2005). In years with relatively 

warmer water temperatures, more than 94% of the mature females in June carried uneyed 

embryos (Chilton et al. 2010). The eyed to uneyed embryo ratio ranges from 6.54 to 0.42 in cold 

years, compared to 0.06 to 0.01 in the warmer years, indicating a high number of females within 

the survey area did not complete the molting and mating cycle in early June. The ratio of eyed to 

uneyed embryos in mature females decreased dramatically when the Bristol Bay stations were 

resampled in cold years, ranging from 0.02 to < 0.01, and indicating the majority of mature 

females have completed the mating and molting cycle (Table 7). In 2011, the ratio of eyed to 

uneyed embryos decreased from 0.81 in early June during the standard survey to 0.06 in late July 

during the resampling event. 

Similar to the previous 5 years, the cold water temperatures in 2011 delayed the molting and 

mating cycle in mature female red king crab and only 52% of the 450 mature females sampled 

during the standard survey had extruded a new clutch of uneyed embryos. In early June, the 

oldshell females with empty egg cases were distributed in the central and northern section of 

Bristol Bay while the new, hardshell females with uneyed embryos were primarily distributed 

along the Alaska Peninsula in the southeastern section of Bristol Bay (Fig. 12a). Among 

resurveyed female crab in late July, 93% were mature females and 94% of these were in new, 

hardshell condition with newly extruded uneyed embryos (Fig. 13). 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 late July (Fig. 12b). The total density of mature female red 

king crab caught at the 20 resample stations in early June was 28,732 crab/nmi2

 compared to a 

total density of 63,897 crab/nmi2 at those same resample stations in late July, indicating a 

number of the mature females were outside the central distribution area of Bristol Bay in early 

June (Figs. 12a and 12b). 

The 2011 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 late July. The 

2011 mature female red king crab biomass estimate of 37,486 ± 19,011 t represented 91% of the 

total female abundance (Table 6) with immature female red king crab biomass estimated at 3,760 

± 4,995 t (Table 5). The majority of the mature female red king crab were caught in the central 

area of Bristol Bay and along the Alaska Peninsula in shallow, nearshore waters while a high 

number of juvenile females were caught at station G-15 (Figs. 7 and 8). 

8 
 

 

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 7 of the 77 stations in the Pribilof District; 7 stations in the highdensity sampling area and zero stations in the standard-density sampling area in 2011. The 

density of legal-sized males caught at a station ranged from 74 to 2,219 crab/nmi2

 (Appendix A). 

Legal-sized male red king crab were caught at 6 of the 77 stations in the Pribilof District; 6 

stations in the high-density sampling area and zero stations in the standard-density sampling 

area, with a biomass estimate (± 95% CI) of 3,751 ± 4,787 t. Legal-size males represented 49% 

of the total male biomass but were below the average of 5,360 ± 5,961 t crab from the previous 

20 years (Table 8). The majority of the legal-sized males were distributed south and west of St. 

Paul Island at stations G-21 and GH-2122 (Figs. 14 and 15). 

Mature males were encountered at 6 of the 77 stations in the Pribilof District; 6 stations in the 

high-density sampling area (F-18 to J-22) and zero stations in the standard-density sampling 

area, and 100% of the 56 mature and 2 immature males caught were measured (Table 5, Fig. 16). 

The biomass estimate of mature males was 3,834 ± 4,872 t and represented 99% of the total male 

biomass (Table 8) with the remaining 1% represented by 44 ± 86 t of immature male red king 

crab (Table 5). Mature males were distributed ubiquitously around St. Paul Island in the 

nearshore shallow water stations and to the northeast of St. Paul Island (Figs. 14 and 15). 

The 2011 size-frequency for red king crab males shows an increase in the number of oldshell and 

very oldshell legal-sized males in comparison to the 2009 and 2010 shell conditions (Fig. 17). In 

2011, 17% of the legal-sized males were evaluated as new hardshell crabs and distributed 

northeast of St. Paul Island. Eighty-three percent of the legal-sized males were in oldshell and 

very oldshell condition and primarily distributed southeast of St. Paul Island (Fig 18). 

The 2011 biomass estimate of mature-sized red king crab females was 814 ± 1,165 t, 

representing 99.9% of the total female biomass, with immature female red king crab biomass 

estimated at 3 ± 6 t (Table 8). Female biomass estimates are imprecise due to the limited number 

of tows with positive crab catches (Appendix A, Figs. 14 and 15). All of the mature females were 

carrying uneyed embryos with 96% of the mature females and 4% of the immature females in 

new hardshell condition. The majority of mature females with uneyed embryos were in the 130 

mm to 140 mm CL size class (Fig. 19). 

9 
 

 

Pribilof District Blue King Crab 

Blue king crab were caught at 5 of the 77 stations in the Pribilof District; 5 stations in the highdensity sampling area and zero stations in the standard-density sampling area in 2011. Legalsized males were caught at two stations east of St. Paul Island and one station north of St. 

George, with a density ranging from 74 to 454 crab/nmi2

 (Appendix A, Figs. 20 and 21). The 

2011 biomass estimate (± 95% CI) of legal-sized males was 399 ± 693 t, representing 86% of the 

total male abundance and well below the average of 1,603 ± 1,293 t for the previous 20 years 

(Table 9). 

Blue king crab mature males were caught at 3 of the 77 stations in the Pribilof District; 3 stations 

in the high-density sampling area and zero stations in the standard-density sampling area and 

100% of the nine mature males caught were measured (Table 5, Fig. 22). The mature male 

biomass estimate of 461 ± 763 t represents 100% of the total male abundance since no immature 

male blue king crab were caught on the 2011 survey in the Pribilof District (Tables 5 and 9, Figs. 

20 and 21). 

The 2009 male blue king crab cohort at the 125 mm to 130 mm CL size class advanced to 

approximately the 145 mm to 155 mm CL size class in 2010 and appears in the 180 mm CL size 

class in 2011 (Fig. 23). Seven legal-sized male blue king crab were captured on the 2011 survey 

in the Pribilof District; five new hardshell males and one oldshell male were caught east of St. 

George Island at station H-19 while one legal-sized male was in new hardshell condition and 

caught northeast of St. Paul Island (Fig. 24). 

One mature female blue king crab was caught in the Pribilof District high-density sampling area 

at station GF-2120 with a biomass estimate of 22 ± 43 t, and represents 60% of the total female 

biomass (Table 9, Figs. 20 and 21). Immature female blue king crab were caught at two stations 

north of St. Paul Island in the Pribilof District high-density sampling area with a biomass 

estimate of 15 ± 25 t for 2011 (Table 5, Figs. 20 and 21). Estimates of female biomass are 

imprecise due to the preference of these crab 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 is in a nonembryo-bearing phase (Somerton and MacIntosh 1985). One of the three female blue king crab 

sampled in the Pribilof District was brooding uneyed embryos, while one immature female was 

in new hardshell condition and the third crab was barren with a new hardshell (Fig. 25). 

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. Blue king crab were caught at 28 of the 57 total stations in 

the St. Matthew Island Section sampling strata; 18 stations in the high-density sampling area and 

10 stations in the standard-density sampling area. The density of legal-sized males caught at a 

station ranged from 72 to 3,988 crab/nmi2

 and were captured primarily south and west of St. 

Matthew Island (Appendix A, Figs. 26 and 27). One hundred and thirty-two legal-sized male 

blue king crab were caught in 2011 with a biomass estimate (± 95% CI) of 5,701 ± 5,504 t 

10 
representing 52% of the total male biomass which was above the average of 2,997 ±1,468 t from 

the previous 20 years (Table 10). 

Mature male blue king crab were caught at 23 of the 59 stations surveyed in the St. Matthew 

Island Section sampling strata and 100% of the 255 mature and 92 immature males caught were 

measured, respectively (Table 5, Fig. 28). The mature male biomass estimate in 2011 was 9,516 

± 10,167 t, representing 86% of the total male biomass (Table 10), while the immature male 

biomass estimate of 1,699 ± 2,064 t made up the remaining 14% of the total male biomass (Table 

5). The majority of the immature male blue king crab were distributed in the shallow waters 

surrounding St. Matthew Island while a majority of the mature males were caught southwest of 

St. Matthew Island (Figs. 26 and 27). 

The 2009 100 to 110 mm CL male blue king crab cohort grew to 115 mm to 120 mm CL in 2010 

and 135-145 mm CL in 2011 with increasing oldshell and very oldshell condition classes (Fig. 

29). In 2011, 60% of the legal-sized males were new hardshell crabs, with the majority 

distributed south of St. Matthew Island, followed by 28% in soft and molting condition while the 

remaining 12% were oldshell and very oldshell condition crabs (Fig. 30). 

The 2011 mature female blue king crab biomass estimate was 51 ± 52 t, representing 38% of the 

female biomass (Table 10), and the immature female blue king crab biomass estimate was 104 ± 

125 t (Table 5). Mature females were caught at two stations, Q-23 and PQ-2423 and immature 

females were caught at four stations, primarily southwest of St. Matthew Island (Figs. 26 and 

27). One mature female was in new hardshell condition with uneyed embryos while one mature 

female was new hardshell with empty egg cases (see female Pribilof District Blue King Crab 

discussion above). The remaining 15 females were new hardshell and immature in the 64 to 

89 mm CL size classes (Fig. 31). 

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 the area east of 166°W is determined by the biomass estimate of males 

≥ 138 mm CW while the Tanner crab GHL in the area west of 166°W 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 these size categories (Zheng and Pengilly 2011), although the 

industry may self-impose retention of crab ≥ 5.5 inches CW and 5.0 inches CW (125 mm, 

without spines) east and west of 166°W, respectively. In this document, we have provided the 

2011 abundance and biomass estimates the for the two legal-size categories as well as for 

≥ 5.5 inches CW east of 166°W and ≥ 5.0 inches west of 166°W (Tables 5, 11 and 12). 

Tanner crab were caught at 72 of the 121 stations east of 166°W and 162 of the 255 stations west 

of 166°W with Tanner crab occurring at 41 and 22 stations in the high-density area of the 

Pribilof District and St. Matthew Island Section sampling strata west of 166°W (Appendix A, 

Fig. 32). 

11 
 

Legal-sized Tanner crab were caught at 44 of the 121 stations east of 166°W and 99 of the 255 

stations west of 166°W with one station, G-21, contributing ≥ 100 legal-sized males west of 

166°W (Table 5, Fig. 33). Ninety-nine percent of the legal-sized males caught east of 166°W 

were measured while 74% of the legal-sized males caught west of 166°W were measured (Table 

5). The 2011 biomass estimate (± 95% CI) for legal male Tanner crab east of 166°W was 10,201 

± 5,880 t and 52% of those were males ≥ 5.5 inches CW with a biomass estimate of 5,356 ± 

4,344 t (Table 11). The 2011 biomass estimate for legal male Tanner crab west of 166°W was 

23,259 ± 16,712 t and 67% of those were males ≥ 5.0 inches CW with a biomass estimate of 

15,660 ± 13,658 t (Table 12). The majority of the Tanner males ≥ 138 mm CW east of 166°W 

were distributed in the northeast section of Bristol Bay and the majority of Tanner males ≥ 125 

mm CW west of 166°W were distributed to the southwest of the Pribilof Islands while sublegal 

males were distributed throughout the EBS shelf with high abundances at stations F-07 and G-01 

(Fig. 34). 

In 2010, a total of 1,795 male Tanner crab chela height and carapace width measurements were 

collected on the EBS bottom trawl survey. The scatterplot of the allometric relationship between 

chela height and carapace width using the data collected in 2010 and in 2008 (n =1,783) 

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. 35). 

The carapace widths for small claw males ranged from 14.0 to 137.3 mm compared to 

66.6 to 175.2 mm for large claw males. Large claw males with carapace widths below the legalsize 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). 

The 2009 male size class of 55 to 65 mm CW appears at approximately the 85 to 95 mm CW 

size classes in 2010 and advanced into the 110 to 125 mm size classes in 2011 (Fig. 36). A high 

number of new hardshell males were caught in 2011 in the 30 to 50 mm and 60 to 70 mm CW 

size categories. Old and very oldshell males in the 90 to 130 mm CW size classes remain in the 

population, and are distributed in the southwest section of the EBS shelf at depths greater than 

100 m as well as south and east of the St. Paul Island (Fig. 37). 

The 2011 mature female Tanner crab biomass estimate east and west of 166°W was 1,727 ± 

1,006 t and 5,125 ± 842 t, respectively, while the immature female Tanner crab biomass east and 

west of 166°W was 4,939 ± 3,242 t and 6,5556 ± 2,228 t, respectively (Tables 5, 11 and 12). 

Forty percent of the mature female population was distributed east of 166°W in the ADF&G 

Eastern management district in the central and southwestern area of the Bristol Bay District, 

while the immature females were distributed throughout the EBS shelf between the 50 and 

200 m isobaths (Figs. 32 and 34). Among sampled mature females, 7% were softshell, 33% were 

new-hardshell, and 60% were oldshell and very oldshell. Eighty-four percent of the mature 

females carried newly extruded embryos while 5% were brooding eyed embryos, less than 1% 

had not produced a new clutch and 10% were barren (Fig. 38). 

Snow Crab 

12 
 

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 density of legal-sized male 

snow crab is reported for both legal (≥ 3.1 in. CW) and preferred (≥ 4.0 in. CW) size categories 

and listed by station in Appendix A. The biomass estimates for male snow crab are reported for 

both legal and preferred size categories in this report (Table 13). 

Snow crab were caught at 274 of the 376 stations in the combined areas of the Bristol Bay 

District, Pribilof District, and St. Matthew Island Section sampling strata. Snow crab occurred at 

40 stations in the high-density area of the Pribilof District and 27 stations in the high-density area 

St. Matthew Island Section sampling strata (Appendix A). Legal-sized snow crab were caught at 

231 of the 376 standard stations (Fig. 39) and 57% of the legal-sized males caught were 

measured (Table 5). 

Legal-sized male snow crab were caught at 235 stations, throughout all Districts combined, 

resulting in a biomass estimate (± 95% CI) of 146,275 ± 32,651 t and representing 41% of the 

total male abundance. Thirty-nine percent of those legal males were ≥ 4.0 inches CW with a 

biomass estimate of 94,741 ± 22,022 t (Table 13), while the biomass estimate of sublegal males 

was 114,962 ± 36,799 t (Table 5). These legal-sized male snow crab were distributed throughout 

the EBS shelf with higher concentrations around the Pribilof Islands (Figs. 40 and 41). 

Approximately 89% of all legal male snow crab were east of 173°W in the ADF&G Eastern 

management district compared to 70% in 2010. 

In 2011, a total of 1,130 male snow crab chela height and carapace width measurements were 

collected on the EBS bottom trawl survey. The scatterplot of the allometric relationship between 

chela height and carapace width using the data collected in 2011 and in 2009 (n = 1,303) 

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. 42). The 

carapace widths for small claw males ranged from 21.3 to 121.2 mm compared to 40.6 to 151.6 

mm for large claw males. 

A high number of pre-recruit new hardshell males appeared in the 45 to 50 mm size category in 

2010, and advanced into the 55 to 65 mm size category in 2011 (Fig. 43). Among legal-sized 

male crab, 4% were in molting or softshell condition while 69% were in new-hardshell condition 

indicating a recent molt and distributed between the 50 and 100 m isobaths in the middle shelf of 

the EBS survey area as well as between the 100 and 200m isobaths in the northwest area of the 

EBS shelf. Twenty-seven percent of the legal-sized males were oldshell and very oldshell 

condition crabs and primarily distributed in the southwestern section of the EBS shelf (Fig. 44). 

The mature female snow crab biomass estimate of 236,886 ± 84,721 t was 77% of the total 

female biomass and the immature female crab biomass estimate was 72,308 ± 27,103 t (Tables 5 

and 13). Among sampled mature females; 62% were in new-hardshell condition with 98% 

brooding newly extruded embryos, 37% were oldshell and very oldshell condition with 97% 

brooding new embryos, while less than 1% of the old and very old shell females had not 

produced a new clutch, and less than 1% of the mature females were barren (Fig. 45). 

13 
Chionoecetes bairdi/opilio hybrid 

Chionoecetes spp. hybrid crab were caught at 163 of the 365 stations in the combined areas of 

the Bristol Bay, Pribilof, and Northern Districts. Chionoecetes hybrid crab occurred at 36 

stations in the Pribilof District high-density sampling area, and 11 stations in the high-density 

sampling area of the St. Matthew Island Section of the Northern District (Appendix A). 

In this document, C. 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). The biomass estimates for 

legal-sized male C. hybrid crab combines both the preferred and legal size categories. The 

density of legal-sized male C. hybrid crab are listed by station in Appendix A and are separated 

into preferred (≥ 4.0 in. CW) and legal (≥ 3.1 in. CW) size categories. 

Legal-sized male C. hybrid crab were caught at 126 stations, throughout all Districts combined, 

resulting in a biomass estimate (± 95% CI) of 4,225 ± 1,363 t and were primarily distributed 

northeast of the Pribilof Islands between 50 and 100 m (Figs. 46 and 47). Ninety-two percent of 

those legal males were ≥ 4 inches in carapace width, with a biomass estimate of 3,892 ± 1,321 t. 

The 2011 sublegal male C. hybrid crab biomass estimate for all Districts combined was 2,808 ± 

1,421 t, were distributed throughout the northeastern Bering Sea shelf at depths greater than 

50 m (Figs. 46 and 47). 

The 2011 mature female C. hybrid crab biomass estimate was 3,084 ± 1,257 t and the immature 

female crab biomass estimate was 471 ± 229 t. The majority of the mature female hybrid crab 

were primarily distributed south of St. Matthew Island and between 100 and 200 m in the 

northwestern area of the eastern Bering Sea shelf (Figs. 46 and 47). 

Other Crab Stocks and Species of Interest 

Northern District Red King Crab 

Red king crab were caught at 28 stations in the Northern District outside of the current 

management units where red king crab are commercially fished (Fig. 2). The 2011 biomass 

estimates were calculated using an area of 11,228 nmi2

 based on the number of stations with 

catches of red king crab in the Northern District. Legal-sized males were caught at 14 of those 

stations. The density of legal-sized males caught at a station ranged from 74 to 156 crab/nmi2 

(Appendix A). The 2011 biomass estimate (± 95% CI) of legal-sized males was 1,479 ± 620 t 

while the biomass estimate of mature and immature males was 2,047 ± 729 and 369 ± 208 t, 

respectively. The biomass estimate of mature female red king crab was 888 ± 392 t while the 

biomass estimate of immature females was 33 ± 45 t. The majority of both legal males and 

mature female red king crab were caught in depths < 50 m at stations south and west of Nunivak 

Island (Fig. 48). 

Northern District Blue King Crab 

Blue king crab were caught at three stations not included in the blue king crab biomass estimates 

for the Pribilof District or the St. Matthew Island section sampling strata of the Northern District. 

One immature, hardshell female was caught northeast of the Pribilof Islands at station I-02, while 

14 
 

 

 

one mature, hardshell male and one legal-sized, mature male in oldshell condition were caught 

northwest of St. Matthew Island at stations T-26 and V-27, respectively (Appendix A, Fig. 49). 

Hair Crab 

In 2011, a total of 620 hair crab were captured at 68 of the 317 stations throughout all Districts 

combined on the EBS bottom trawl survey (Fig. 50). Historically, hair crab have been 

concentrated just north of the Alaska Peninsula and near the Pribilof Islands. In recent years, 

abundance of hair crab north of 58N has been increasing, particularly west of Nunivak Island 

(Fig. 50). 

In this report, legal male hair crab 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. The 2011 density of legal male hair crab caught at a station 

ranged from 72 to 862 crab/nmi2

 resulting in a biomass estimate of 2,119 ± 239 t (Table 14). 

Legal male hair crab were primarily concentrated in the central Bristol Bay area, near St. Paul 

Island and distributed along the 50 m isobath near Nunivak Island (Fig. 50). 

The 2011 pre-recruit male hair crab biomass estimate (± 95% CI) was 1,750 ± 170 t and the 

female hair crab biomass estimate was 375 ± 21 t (Table 14). A high number of pre-recruit males 

were caught west of Nunivak Island in the northeast section of the standard survey while the 

majority of female hair crab were caught in the central Bristol Bay area at depths > 50 m (Fig. 

50). The density of both pre-recruit male and female hair crab has increased in these two areas 

over the last 4 years with an increasing number of females occurring west of Nunivak Island 

(Chilton et al. 2009 and 2011). 

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 (Bowers et al. 2010). In the 

last few years, the biomass estimates of both size classes of male hair crab have increased 

relative to 2006 with the 2011 biomass estimate for legal-sized male hair crab higher than the 20­

year average of 1,780 ± 820 t (Table 14). 

ACKNOWLEDGMENTS 

We thank Captains Norm Bakken and Mike Wiggins of the FV Aldebaran, and Captain 

Jim Hampton of the FV Alaska Knight and all their crew without which the annual EBS bottom 

trawl survey would not occur. We also thank the dedicated field party chiefs, deck bosses, and 

scientific crew from AFSC and all those who volunteered to come out on the survey. The 

scientific personnel who made up the 2011 “crab crew” included; C. Armistead (AFSC, Kodiak 

Lab), E. Chilton (AFSC, Kodiak Lab), M. Dawson (AFSC Kodiak Lab), R. Foy (AFSC, Kodiak 

Lab), W. Gaeuman (ADF&G), J. Haaga (AFSC, Kodiak Lab), C. Long (AFSC, Kodiak Lab), E. 

Munk (AFSC, Kodiak Lab), N. Roberson (AFSC, Seattle), L. Slater (ADF&G), S. Tamone (UA 

Southeast), D. Urban (AFSC, Kodiak Lab). 

15 
 

 

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relationship between circulating ecdysteroids and chela allometry in male Tanner crabs: 

evidence for a terminal molt in the genus Chionoecetes. J. Crust. Biol. 27(4):635-642. 

Urban, D., D. Pengilly, L. Jadamec, and S. C. Byersdorfer. 2002. Testing carapace morphology 

characteristics for the field identification of Chionoecetes hybrids. Crabs in cold water 

regions: Biology, management, and economics. Anchorage, Alaska. January 2001. Alaska 

Sea Grant College Program AK-SG-02-01, University of Alaska Fairbanks. 

Weinberg, K. L. 2003. Change in the performance of a Bering Sea survey trawl due to varied 

trawl speed. Alaska Fish. Res. Bull. 10(10):42-49. 

17 
 

Zheng, J., H. Hamazaki, and J. K. Soong. 2010. Norton Sound red king crab stock assessment in 

spring 2010. In Stock assessment and fishery evaluation report for the king and Tanner 

crab fisheries of the Bering Sea and Aleutian Islands region. North Pacific Fishery 

Management Council, Anchorage, AK. 

Zheng, J., D. Pengilly. 2011. Overview of proposed harvest strategy and minimum size limits for 

Bering sea district Tanner crab. ADF&G Special Publication No. 11-02, Anchorage, AK. 

18 
 

 

 

 

 

 

 

 

 

 

 

Table 1. -- Definition of carapace size classes for crab species caught in National Marine 

Fisheries Service eastern Bering Sea standard survey. Carapace length (CL) is 

measured for Paralithodes spp. and Erimacrus isenbeckii, while carapace width (CW 

spines) is measured for Chionoecetes species. 

Immature Mature Legal male 

Paralithodes 

camtschaticus 

Bristol Bay District 

males <120 mm ≥ 120 mm ≥ 135 mm CL or ≥ 6.5 in. 

CW 

females <90 mm ≥ 90 mm 

Pribilof District 

males <120 mm ≥ 120 mm ≥ 135 mm CL or ≥ 6.5 in. 

CW 

females < 90 mm ≥ 90 mm 

P. platypus 

Pribilof District 

males <120 mm ≥ 120 mm ≥ 135 mm CL or ≥ 6.5 in. 

CW 

females < 100 mm ≥ 100 mm 

St. Matthew Island 

males < 105 mm ≥ 105 mm ≥ 120 mm CL or ≥ 5.5 in. 

CW 

females < 80 mm ≥ 80 mm 

Chionoecetes bairdi 

East of 166° W 

males ≥ 120 mm or ≥ 4.8 in. CW1 

females < 85 mm ≥ 85 mm 

West of 166° W 

males ≥ 110 mm or ≥ 4.4 in. CW1 

females < 80 mm ≥ 80 mm 

Chionoecetes opilio ≥ 95 mm ≥ 78 mm or ≥ 3.1 in. CW2

 <50 mm ≥ 50 mm ≥ 50 mm 

Erimacrus isenbeckii 

≥ 83 mm3

 CL or > 3.25 in. males CW 

females 1

 The 2011 legal minimum size limit for C. bairdi is ≥ 4.8 inches CW (120 mm) east of 166° W and ≥ 4.4 inches 

CW (110 mm) 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), although processors currently prefer a 

minimum size of 4.0 inches CW (102 mm). 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. 

19 
 

 

 

Table 2. --History of methods for determining trawl on bottom and estimating net width on 

National Marine Fisheries Service eastern Bering Sea bottom trawls. 

Year Net width (m) Trawling methodology 

1975 First and only year tow duration = 1 hour 

1976-2011 Tow duration = 30 minutes 

1975-1995 Brake set and haul back of winch drum wire defined 

trawl contact with seafloor (net on bottom) 

1996-2011 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 - 2011 Variable with All survey vessels used NetMind acoustic sensors 

each tow on the 83-112 trawl net 

 *Single value used for net width when calculating area swept. 

20 
 

 

 

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. 

Species Number 

collected 

a b 

Red king crab males 1086 0.000403 3.141334 

Ovigerous red king crab 1010 0.003593 2.666076 

Non-ovigerous RKC 201 0.000408 3.127956 

Blue king crab males 

Blue king crab females2 

St. Matthew males 

409 

n/a 

386 

0.000508 

0.02065 

0.000502 

3.106409 

2.2700 

3.107158 

Tanner crab males 1030 0.00027 3.022134 

Ovigerous Tanner crab 331 0.000441 2.898686 

Non-ovigerous Tanner 487 0.000562 2.816928 

Snow crab males 1107 0.000267 3.097253 

Ovigerous snow crab 588 0.001158 2.827784 

Non-ovigerous snow crab 

Hair crab males3 

Hair crab females3 

344 

703 

178 

0.001047 

0.00071731 

0.00119453 

2.708367 

3.02 

2.86 

1

Chilton, E.A . Unpublished manuscript. Growth and weight-size relationships of commercial 

crab in the eastern Bering Sea. 

2 Unpublished data. Available from Kodiak Laboratory, Alaska Fisheries Science Center, 301 

Research Court Kodiak AK 99615. 

3

 Armetta and Stevens (1987). 

21 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

______________________________________________________________________________ 

Table 4. --Special projects related to crab species conducted on National Marine Fisheries 

Service eastern Bering Sea bottom trawl survey in 2011. 

Project Title Principle Investigator Agency 

Distribution of Bristol Bay red king crab in Liz Chilton RACE1-SAP2 

nearshore waters of the Alaska Peninsula 

Tanner crab stomach contents and potential prey	 Bob Foy and RACE1-SAP2

 Kathy Swiney 

Pathological specimen voucher Pam Jensen and RACE1

-SAP2

 Frank Morado 

Bitter crab syndrome and population genetics of Frank Morado RACE1-SAP2 

Paralithodes, Hyas, Pagurus, and Elassochirus spp. 

Reproductive potential of snow and Tanner crabs Laura Slater ADF&G3 

in the eastern Bering Sea 

Ocean acidification effects on reproductive Kathy Swiney RACE1-SAP2 

success and larval condition and survival of red 

king crab 

Genetic population structure and Bitter crab Dave Tallmon UAS-UAF4 

syndrome of blue king crab in the eastern and Frank Morado 

Bering Sea 

Cold temperatures affecting snow crab survival	 Dan Urban RACE1-SAP2 

Genetic and photographic documentation of Dan Urban RACE1-SAP2 

Chionoecetes hybrid crab 

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 State of Alaska, Department of Fish and Game. 

4 University of Alaska Southeast and University of Alaska Fairbanks. 

22 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 5. --Summary of 2011 National Marine Fisheries Service eastern Bering Sea bottom trawl 

survey details for seven commercial crab stocks. Size categories are defined in Table 1. 

Number Tows Number Number Biomass CI 

of tows with of crab of crab (t) (± 95%) 

in District crab measured caught 

Bristol Bay District Immature male 156 46 554 1,295 7,864 5,517 

Red king crab Mature male 156 65 417 417 19,599 6,024 

Legal male 156 56 281 281 15,412 5,238 

Immature female 136 17 211 967 3,760 4,996 

Mature female 136 42 898 898 37,486 19,011 

Pribilof Island District Immature male 77 1 2 2 44 86 

 Red king crab Mature male 77 6 56 56 3,834 4,872 

Legal male 77 6 53 53 3,751 4,787 

Immature female 77 1 1 1 3 6 

Mature female 77 3 25 25 814 1,165 

Pribilof Island District Immature male 77 0 0 0 0 0 

Blue king crab Mature male 77 3 9 9 461 763 

Legal male 77 2 7 7 399 693 

Immature female 77 2 2 2 15 25 

Mature female 77 1 1 1 22 43 

St. Matthew Island Immature male 59 17 95 95 1,699 2,064 

Blue king crab Mature male 59 25 256 256 9,516 10,167 

Legal male 59 20 133 133 5,701 5,504 

Immature female 59 4 14 14 104 125 

Mature female 59 4 4 4 51 52 

Tanner crab Sublegal male 121 61 2,932 5,039 13,707 6,726 

east of 166°W Legal male 121 44 471 475 10,207 5,881 

Preferred 121 31 196 196 5,356 4,344 

Immature female 121 51 2,289 3,644 4,939 3,242 

Mature female 121 37 262 267 1,727 1,006 

Tanner crab Sublegal male 255 159 5,407 8,197 16,063 4,615 

west of 166°W Legal male 255 99 1,223 1,647 23,259 16,712 

Preferred 255 71 633 920 15,660 13,658 

Immature female 255 148 4,024 6,788 6,556 2,228 

Mature female 255 83 559 627 5,125 842 

Opilio Tanner crab Sublegal male 376 221 10,200 61,791 114,962 36,799 

Legal male 376 231 7,163 12,625 146,275 32,651 

Preferred 376 205 4,156 5,762 94,741 22,022 

Immature female 376 182 4,586 60,624 72,308 27,103 

Mature female 376 176 8,119 95,351 236,886 84,721 

23 
 

 

 

 

 

 

 

 

 

 

Table 6. --Time series of biomass estimates (t) for Bristol Bay District red king crab 

(Paralithodes camtschaticus) from the National Marine Fisheries Service eastern 

Bering Sea bottom trawl surveys. The 95% confidence intervals (CI) are 1.96 SE. 

Carapace Mature Mature Legal male Legal Mature Mature Grand Grand 

length male male male female female total total 

≥ 120 mm ± CI ≥ 135 mm ± CI ≥ 90 mm ± CI ± CI 

1975 90,276 29,852 60,026 21,210 39,514 25,130 205,284 75,990 

1976 114,833 29,855 71,170 17,175 61,012 35,817 274,281 90,984 

1977 150,193 55,524 94,684 38,241 106,413 37,247 353,230 97,109 

1978 143,700 65,068 96,358 44,868 104,669 40,494 312,120 93,670 

1979 131,619 48,206 94,312 34,386 74,790 22,065 237,037 61,231 

1980 122,361 60,234 98,940 50,257 52,526 30,132 224,846 96,489 

1981 36,083 7,894 24,336 5,849 39,558 12,443 110,295 27,088 

1982 22,220 8,345 9,838 3,420 37,106 14,474 130,594 67,045 

1983 9,582 2,440 2,809 936 6,022 2,345 47,487 19,533 

1984 14,117 7,164 6,830 4,951 9,665 7,828 127,135 169,052 

1985 13,606 4,013 5,210 2,023 3,727 1,828 32,137 9,952 

1986 27,390 26,390 12,678 11,302 4,021 2,268 45,190 37,836 

1987 29,162 14,064 17,600 8,692 12,048 7,604 63,446 25,922 

1988 24,679 8,806 18,296 7,051 14,313 11,744 48,594 20,664 

1989 38,901 15,998 28,678 12,954 9,679 6,395 57,327 23,846 

1990 29,435 10,316 22,490 8,598 13,559 11,135 51,259 21,426 

1991 61,403 67,982 53,217 60,515 11,881 10,525 81,217 70,131 

1992 17,838 6,651 13,393 4,856 8,547 4,250 33,735 11,480 

1993 28,283 9,042 19,183 6,461 12,504 6,149 48,426 16,464 

1994 19,240 6,588 13,023 4,593 6,491 2,791 29,787 9,945 

1995 20,372 14,360 15,159 9,703 6,918 3,299 34,826 18,801 

1996 17,631 7,148 14,682 6,438 9,706 5,373 40,531 16,107 

1997 31,679 13,031 26,699 11,934 18,084 12,686 76,661 39,515 

1998 32,386 10,211 18,906 6,459 27,643 13,942 74,171 25,796 

1999 35,215 11,419 26,376 9,158 12,003 5,442 53,032 13,942 

2000 29,950 6,511 21,180 4,617 15,930 8,610 55,859 15,353 

2001 18,557 5,622 14,965 4,737 17,589 10,493 46,121 16,117 

2002 32,469 12,371 24,588 9,507 14,664 7,910 63,780 25,223 

2003 42,629 16,149 32,165 12,968 28,445 12,691 85,591 27,509 

2004 39,676 12,686 33,470 11,228 24,260 11,459 87,987 28,393 

2005 37,090 13,714 27,643 11,650 34,955 14,979 93,764 31,741 

2006 36,953 15,679 29,273 14,164 24,696 4,995 78,645 18,777 

2007 42,543 16,015 33,451 13,949 27,532 6,853 84,879 20,608 

2008 39,411 11,195 28,013 8,701 35,764 19,492 90,324 27,059 

2009 34,262 24,416 22,542 17,128 28,758 18,146 71,912 46,293 

2010 30,248 9,246 21,347 7,504 40,797 21,869 77,072 32,165 

2011 19,599 6,024 15,412 5,238 37,486 19,011 68,709 28,611 

24 
 

 

Table 7. --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 ratio of eyed to uneyed 

embryos in mature red king crab females with the warm years highlighted in gray. 

Bristol Bay stations were sampled twice during the cold years. 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 

Eyed to 

uneyed 

embryo ratio 

May 1999 0.1 0.8 (41) t = -11.9 6.54 

July 1999 2.5* 0.8 (31) 0.02 

May 2000 1.7 0.5 (49) t = -9.2 1.45 

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 0.59 

July 2006 4.2* 0.8 (30) 0.01 

June 2007 1.8 0.9 (68) t = -7.4 0.86 

July 2007 3.4* 1.0 (32) 0.01 

June 2008 1.4 0.7 (76) t = -9.5 0.45 

July 2008 3.6* 1.1 (32) 0.00 

June 2009 1.5 1.6 (73) t = -8.6 0.42 

July 2009 4.5* 1.5 (32) 0.00 

June 2010 2.0 0.9 (40) t = -10.9 0.64 

July 2010 4.8* 1.0 (23) 0.03 

June 2011 2.9 0.8 (46) t = -8.6 0.80 

July 2011 5.9* 1.1 (20) 0.06 

25 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 8. --Time series of biomass estimates (t) for Pribilof District red king crab (Paralithodes 

camtschaticus) from National Marine Fisheries Service eastern Bering Sea bottom 

trawl surveys. The 95% confidence intervals (CI) are 1.96 SE. 

Carapace Mature Mature Legal Legal Mature Mature Grand Grand 

length male male male male female female total total 

≥ 120 mm ± CI ≥ 135 mm ± CI ≥ 90 mm ± CI ± CI 

1978 1,228 1,986 1,228 1,986 42 82 1,270 2,068 

1979 859 661 790 657 76 108 935 715 

1980 1,312 1,354 1,312 1,354 195 247 1,512 1,586 

1981 299 343 299 343 97 148 396 366 

1982 1,440 1,970 1,440 1,970 673 1,007 2,131 2,988 

1983 518 542 486 494 216 205 761 716 

1984 261 283 233 279 67 75 328 343 

1985 60 118 60 118 0 0 60 118 

1986 135 185 135 185 57 111 192 273 

1987 53 103 53 103 25 49 77 113 

1988 104 204 43 84 420 718 1,529 1,756 

1989 1,498 2,671 854 1,415 1,442 1,961 4,000 5,512 

1990 897 1,632 109 213 1,754 2,375 8,589 14,123 

1991 4,335 6,765 1,295 2,047 3,790 4,468 8,819 11,747 

1992 3,238 3,785 2,479 2,630 2,591 4,658 6,117 8,649 

1993 9,687 17,497 9,017 16,185 4,829 6,789 14,800 22,430 

1994 9,052 13,170 7,994 11,344 3,393 5,024 12,996 18,940 

1995 24,282 20,572 22,428 19,226 6,171 6,180 31,053 25,213 

1996 2,323 1,692 2,292 1,670 1,456 2,117 3,845 3,448 

1997 6,056 7,393 5,843 7,305 1,436 1,597 8,970 8,604 

1998 2,282 1,610 1,749 1,296 1,259 1,885 3,951 3,553 

1999 5,422 7,092 4,394 5,995 2,252 3,258 13,445 16,773 

2000 4,239 3,104 3,773 2,722 727 891 5,127 3,892 

2001 8,434 12,995 5,663 7,808 4,333 8,450 15,047 25,801 

2002 6,916 9,299 6,894 9,300 571 576 7,495 9,735 

2003 5,280 6,807 5,184 6,638 1,642 2,922 6,924 8,408 

2004 3,563 4,114 3,563 4,114 844 881 4,693 5,188 

2005 1,219 1,398 1,219 1,398 2,207 3,393 3,479 4,019 

2006 6,762 4,735 6,484 4,573 1,406 1,690 8,265 6,075 

2007 7,176 5,489 6,947 5,245 2,527 2,563 9,912 8,127 

2008 5,375 5,335 5,022 5,162 2,076 2,827 7,797 7,639 

2009 2,454 3,066 2,088 2,519 546 590 3,044 3,623 

2010 3,107 2,336 2,881 2,049 468 379 3,605 2,486 

2011 3,834 4,872 3,751 4,787 814 1,165 4,695 5,707 

26 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 9.-- Time series of biomass estimates (t) 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. 

Carapace Mature Mature Legal Legal Mature Mature Grand Grand 

length male male male male female female total total 

≥ 120 ± CI ≥ 135 ± CI ≥ 100 ± CI ± CI 

mm mm mm 

1975 34,051 33,248 24,267 23,702 10,912 14,772 53,560 46,308 

1976 9,543 7,723 8,595 7,056 2,594 4,126 19,076 21,334 

1977 38,756 58,267 36,706 56,390 11,259 19,765 55,710 66,015 

1978 15,798 17,245 12,291 15,458 6,171 8,918 24,807 26,813 

1979 13,261 6,655 11,198 5,469 2,843 2,706 18,720 10,371 

1980 14,782 9,167 12,418 7,042 62,997 111,482 80,052 116,752 

1981 10,675 3,524 9,617 3,203 8,298 7,358 22,816 11,733 

1982 6,584 2,450 6,185 2,343 8,763 11,923 17,009 13,670 

1983 4,867 1,708 4,069 1,392 9,864 15,159 15,992 16,991 

1984 1,615 779 1,342 693 2,536 1,922 4,294 2,351 

1985 959 501 687 381 520 457 1,518 856 

1986 1,368 812 1,340 807 2,383 4,271 3,766 4,443 

1987 2,659 2,144 2,529 2,054 785 908 3,746 2,961 

1988 766 794 766 794 478 459 1,617 1,129 

1989 752 940 752 940 714 658 3,660 3,722 

1990 3,121 2,706 1,411 1,140 2,224 1,701 9,002 6,840 

1991 4,203 3,221 3,025 2,666 2,119 1,651 8,237 5,304 

1992 3,982 3,308 2,790 2,414 1,543 1,400 8,286 6,985 

1993 4,072 2,491 2,841 1,710 1,636 1,465 7,155 3,986 

1994 3,028 2,051 2,491 1,716 4,524 3,969 8,436 5,821 

1995 7,696 8,198 6,307 6,780 4,482 3,835 13,402 11,546 

1996 4,221 2,223 3,522 1,830 5,418 5,356 10,449 6,631 

1997 2,940 1,591 2,515 1,337 2,840 2,390 6,316 3,392 

1998 2,453 1,230 2,191 1,125 1,761 1,588 5,265 2,508 

1999 1,476 1,020 1,201 862 2,755 2,480 4,491 3,568 

2000 1,902 1,103 1,588 949 1,439 1,304 3,467 2,072 

2001 1,454 2,093 1,329 1,975 1,816 2,571 3,350 4,724 

2002 618 613 588 605 1,401 2,129 2,019 2,675 

2003 638 501 610 492 1,286 1,880 1,963 2,311 

2004 97 111 44 86 118 120 251 172 

2005 313 435 313 435 370 413 1,457 1,662 

2006 137 163 115 158 522 732 758 886 

2007 254 397 170 245 216 350 674 872 

2008 42 82 42 82 493 637 906 1,291 

2009 452 632 170 201 595 979 1,309 1,929 

2010 322 290 202 191 352 428 852 938 

2011 461 763 399 693 22 43 498 786 

27 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 10. -- Time series of biomass estimates (t) for blue king crab (Paralithodes platypus) 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. 

Carapace Mature Mature Legal Legal Mature Mature Grand Grand 

length male male male male female female total total 

≥ 105 mm ± CI ≥ 120 mm ± CI ≥ 80 mm ± CI ± CI 

1978 5,387 4,125 3,004 1,940 143 140 8,477 6,876 

1979 5,835 4,472 3,500 2,761 1,025 1,662 9,626 8,348 

1980 7,586 7,052 4,945 3,893 938 1,611 11,039 11,807 

1981 5,821 4,609 4,483 4,110 125 109 6,455 5,059 

1982 13,947 8,641 11,280 6,366 296 471 15,986 10,807 

1983 8,129 4,496 6,382 3,341 1,645 2,194 10,861 7,507 

1984 3,486 1,289 2,946 1,168 228 305 4,208 1,591 

1985 2,608 1,109 2,223 910 95 93 3,105 1,227 

1986 1,170 891 668 407 34 66 1,509 1,213 

1987 1,842 1,029 1,174 628 84 73 2,523 1,501 

1988 2,582 1,226 1,722 752 443 414 3,941 2,089 

1989 4,388 2,152 3,137 1,586 1,041 830 8,815 5,139 

1990 5,423 2,809 4,314 2,233 143 167 6,775 3,743 

1991 5,559 2,666 3,754 1,742 454 724 7,818 4,750 

1992 5,737 2,296 4,223 1,663 198 262 7,349 3,025 

1993 7,692 2,451 5,729 1,832 1,798 3,279 11,813 6,576 

1994 5,305 1,830 3,886 1,326 197 155 6,352 2,107 

1995 4,465 1,512 3,160 1,182 64 54 5,597 1,925 

1996 7,762 3,662 5,700 2,539 487 778 9,711 4,468 

1997 9,137 5,899 6,723 3,736 498 767 11,030 7,158 

1998 6,828 4,803 5,025 3,259 280 272 8,083 5,279 

1999 1,302 465 1,067 424 24 34 1,652 612 

2000 1,721 1,041 1,407 912 75 66 2,092 1,258 

2001 2,297 1,147 1,776 971 89 100 2,917 1,419 

2002 1,502 948 1,258 892 89 120 1,698 1,026 

2003 1,126 697 841 453 365 467 2,041 1,752 

2004 1,227 689 1,044 548 117 110 1,881 1,277 

2005 1,276 901 932 640 103 113 1,821 1,319 

2006 2,946 2,064 2,254 1,341 123 115 4,042 2,569 

2007 4,153 2,829 2,028 1,220 81 80 6,788 4,903 

2008 3,335 1,879 2,471 1,417 103 129 5,346 3,129 

2009 4,622 2,390 2,351 1,098 202 178 6,720 3,371 

2010 8,141 5,955 4,317 2,165 362 672 12,683 12,501 

2011 9,516 10,167 5,701 5,504 51 52 11,294 12,272 

28 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 11. -- Time series of biomass estimates (t) for Tanner crab (Chionoecetes bairdi) from National 

Marine Fisheries Service eastern Bering Sea bottom trawl surveys, east of 166° W. The 95% 

confidence intervals (CI) are 1.96 SE. 

Carapace 

width Legal male Legal male Preferred 

male 

Preferred 

male 

Mature 

female 

Mature 

female 

Grand 

total 

Grand 

total 

≥ 120 mm ± CI ≥ 138 mm ± CI ≥ 85 mm ± CI ± CI 

1976 97,166 25,908 64,626 18,909 55,558 16,852 194,701 43,271 

1977 78,490 24,688 50,660 17,633 47,898 30,259 170,293 60,736 

1978 58,229 17,719 34,583 12,710 25,751 14,471 106,782 33,092 

1979 26,134 7,368 16,963 5,303 6,795 3,212 41,723 12,108 

1980 38,041 24,131 24,470 17,294 18,268 13,018 72,215 42,213 

1981 15,748 6,125 7,199 2,712 11,689 6,002 37,387 14,977 

1982 9,509 3,383 3,640 1,395 11,692 5,364 30,787 10,856 

1983 8,806 4,306 2,967 1,486 7,148 3,712 23,053 8,531 

1984 10,194 3,126 5,734 2,038 6,301 4,009 20,927 7,062 

1985 6,146 2,955 3,466 1,976 4,714 3,943 13,912 6,810 

1986 4,286 2,965 2,234 2,493 3,681 1,793 17,221 5,992 

1987 10,033 4,445 4,312 2,814 10,855 6,155 58,262 27,155 

1988 22,929 24,162 11,032 13,729 29,619 17,339 96,289 50,079 

1989 54,096 18,262 23,762 9,531 22,228 6,857 151,792 34,821 

1990 53,184 19,958 33,140 15,060 22,635 10,978 129,232 33,230 

1991 54,786 34,572 26,074 13,522 35,255 19,440 145,012 62,623 

1992 68,294 44,366 30,942 22,509 14,846 7,175 111,973 60,555 

1993 41,993 16,562 17,559 7,233 6,864 2,924 64,382 21,551 

1994 27,285 9,443 13,412 4,709 6,525 3,633 42,370 15,520 

1995 16,731 8,221 7,967 4,330 7,115 4,508 30,465 14,320 

1996 15,867 10,440 8,026 5,697 6,910 4,645 31,877 17,523 

1997 5,236 1,937 2,976 1,408 2,327 971 14,869 4,816 

1998 4,421 1,369 1,791 716 1,364 564 11,815 3,023 

1999 4,590 2,184 1,996 1,173 2,737 2,170 20,812 14,111 

2000 9,150 5,854 4,230 3,239 3,456 2,627 22,923 11,595 

2001 9,289 4,310 5,171 3,206 1,616 839 23,896 10,388 

2002 9,253 4,305 5,722 3,399 1,322 655 21,049 8,241 

2003 9,424 4,794 5,708 3,902 2,078 964 22,337 8,271 

2004 7,951 5,134 4,358 4,449 1,053 425 14,507 5,875 

2005 10,563 4,981 5,337 3,752 2,747 1,857 25,689 10,534 

2006 11,067 4,834 5,238 3,306 5,707 4,445 40,442 26,449 

2007 12,271 6,678 4,976 3,847 7,331 6,411 39,607 23,044 

2008 19,346 10,082 8,928 6,530 4,902 2,640 41,106 14,009 

2009 9,512 4,339 3,962 2,659 4,393 3,765 23,255 9,780 

2010 9,752 4,808 4,636 2,701 1,613 1,509 18,240 7,262 

2011 10,207 5,880 5,356 4,344 1,727 1,006 30,580 12,720 

29 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 12. -- Time series of biomass estimates (t) for Tanner crab (Chionoecetes bairdi) from National 

Marine Fisheries Service eastern Bering Sea bottom trawl surveys, west of 166° W. The 95% 

confidence intervals (CI) are 1.96 SE. 

Carapace 

width Legal male Legal male Preferred 

male 

Preferred 

male 

Mature 

female 

Mature 

female 

Grand 

total 

Grand 

total 

≥ 110 mm ± CI ≥ 125 mm ± CI ≥ 80 mm ± CI ± CI 

1976 47,276 19,447 39,813 17,586 16,595 12,410 76,573 27,584 

1977 40,254 22,107 34,480 20,378 21,949 7,746 93,727 50,647 

1978 12,851 6,236 10,239 5,442 15,112 4,998 53,316 19,345 

1979 17,142 5,356 10,818 3,609 28,398 10,937 66,091 27,534 

1980 28,633 9,871 14,311 5,776 100,494 19,195 219,464 88,296 

1981 19,037 6,038 8,362 3,848 58,732 13,799 130,482 51,595 

1982 25,998 10,018 11,913 5,430 92,704 17,934 152,287 70,254 

1983 13,430 5,087 5,776 2,339 27,310 7,392 56,118 19,662 

1984 10,056 3,985 3,747 1,635 18,434 6,682 40,255 14,415 

1985 3,230 1,191 1,494 636 4,858 1,635 12,911 4,772 

1986 3,353 1,839 842 502 3,466 1,434 16,896 10,212 

1987 7,142 3,741 4,272 2,927 6,135 1,402 26,634 8,168 

1988 18,235 11,352 10,898 7,885 15,244 6,333 65,033 28,486 

1989 25,497 12,160 16,967 9,763 16,308 4,521 68,610 21,966 

1990 36,030 17,810 24,819 13,220 31,766 20,848 92,611 39,024 

1991 34,951 13,422 22,478 9,170 30,239 8,528 93,382 26,677 

1992 24,822 11,947 17,109 10,572 28,648 9,195 72,467 21,808 

1993 11,097 4,734 6,471 3,276 11,251 2,856 33,314 9,934 

1994 10,351 3,759 5,982 2,424 8,727 3,435 27,980 8,625 

1995 12,161 7,037 6,853 4,086 13,633 5,342 32,030 14,482 

1996 6,814 5,799 3,767 3,461 7,182 4,188 18,953 12,896 

1997 2,926 1,068 1,149 518 2,724 1,177 9,118 3,090 

1998 2,650 962 1,112 450 2,437 828 11,420 3,779 

1999 1,709 635 627 292 3,457 1,048 13,160 4,808 

2000 2,029 654 639 296 2,571 958 12,607 3,541 

2001 4,020 1,887 1,826 1,141 7,246 2,683 26,414 8,808 

2002 3,087 1,320 1,253 620 5,394 1,368 25,492 8,472 

2003 6,547 3,335 2,730 1,651 10,896 2,221 39,972 14,086 

2004 9,896 5,111 2,873 1,220 6,528 1,386 41,307 11,777 

2005 24,158 9,813 14,199 7,147 16,511 4,278 79,802 21,033 

2006 35,464 17,785 21,130 14,918 28,795 5,449 116,973 31,793 

2007 37,785 24,597 19,397 15,258 15,739 2,967 107,696 37,742 

2008 26,871 16,126 13,474 10,557 13,823 3,867 65,423 24,664 

2009 20,175 8,249 11,087 4,609 8,282 2,192 45,060 13,789 

2010 17,783 7,015 10,354 4,649 3,877 1,065 34,893 9,539 

2011 23,259 16,712 15,660 13,658 5,125 842 47,965 19,494 

30 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 13. --Time series of biomass estimates (t) for eastern Bering Sea snow crab (Chionoecetes 

opilio) from National Marine Fisheries Service bottom trawl surveys, all Districts 

combined. The 95% confidence intervals (CI) are 1.96 SE. 

Carapace Legal Legal Preferred Preferred Mature Mature Grand Grand 

width male male male male female female total total 

≥ 78 mm ± CI ≥ 102 ± CI ≥ 50 ± CI ± CI 

mm mm 

1980 189,234 44,165 81,496 16,389 260,950 140,114 670,790 210,422 

1981 96,180 19,914 23,307 4,814 144,871 45,737 366,972 82,341 

1982 177,666 47,437 35,037 9,912 161,179 47,003 496,664 97,049 

1983 162,470 39,061 35,138 9,723 86,298 32,808 357,050 71,583 

1984 173,278 39,318 78,377 23,058 45,606 16,700 295,979 54,006 

1985 79,401 15,792 43,273 9,538 7,985 3,081 114,554 19,814 

1986 84,972 18,029 46,730 11,772 29,501 10,552 197,376 44,047 

1987 182,229 35,811 76,981 15,580 191,911 58,150 669,378 133,957 

1988 244,099 70,776 104,981 44,036 194,829 62,097 717,678 139,285 

1989 299,545 61,320 95,777 18,835 270,382 131,495 879,238 229,565 

1990 533,863 137,444 230,379 63,244 207,679 75,475 928,380 184,686 

1991 471,500 134,243 273,249 91,303 239,877 87,868 972,185 220,736 

1992 240,544 43,398 149,383 34,712 154,161 51,594 611,515 104,170 

1993 142,909 27,985 77,337 16,398 129,262 38,630 626,939 153,987 

1994 109,755 16,969 45,063 9,757 129,423 37,003 588,094 106,658 

1995 155,270 39,182 37,525 11,116 160,727 42,361 664,769 100,290 

1996 312,019 75,336 89,236 37,346 90,375 23,432 623,773 94,601 

1997 362,785 66,506 171,986 49,745 92,988 33,764 573,323 87,782 

1998 219,565 36,397 127,921 25,811 73,582 36,071 369,902 69,225 

1999 86,773 14,895 51,992 12,251 33,562 13,500 156,177 26,311 

2000 76,333 19,638 41,070 11,472 104,784 104,992 261,461 134,299 

2001 105,477 22,242 39,997 6,996 97,135 52,856 335,933 100,890 

2002 100,723 44,492 37,354 18,178 35,224 18,692 180,828 58,456 

2003 72,353 15,988 31,642 7,124 47,252 28,272 193,313 56,798 

2004 61,831 16,327 35,755 13,110 50,109 26,079 235,326 60,384 

2005 106,237 22,523 40,162 8,094 103,619 34,344 385,952 92,856 

2006 141,290 71,516 72,344 51,653 77,362 25,977 311,843 107,058 

2007 160,504 44,710 73,844 30,309 87,063 37,408 340,991 83,585 

2008 123,374 23,878 60,477 14,219 61,862 23,212 265,828 54,954 

2009 149,714 36,776 77,903 25,537 68,026 26,916 303,219 69,010 

2010 136,140 31,567 88,788 24,996 132,166 45,594 496,226 106,812 

2011 146,275 32,651 94,741 22,022 236,886 84,721 570,446 135,776 

31 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 14. --Time series of biomass estimates (t) for hair crab (Erimacrus isenbeckii) from 

National Marine Fisheries Service bottom trawl surveys, all Districts combined. The 

95% confidence intervals (CI) are 1.96 SE. 

Carapace Legal Legal Total Total Grand Grand 

length male male female female total total 

≥ 83 mm ± CI ± CI ± CI 

1980 12,172 8,498 370 338 13,153 8,876 

1981 12,052 5,423 159 83 12,911 6,276 

1982 7,107 3,941 194 69 7,482 4,009 

1983 4,537 1,331 296 151 4,899 1,375 

1984 2,657 839 123 89 3,249 928 

1985 2,081 1,041 60 51 2,223 1,071 

1986 1,478 786 100 69 1,785 856 

1987 1,079 606 207 109 1,639 716 

1988 643 350 284 88 1,564 976 

1989 507 252 114 127 3,653 5,235 

1990 803 440 246 148 5,461 5,342 

1991 793 433 229 129 2,399 1,497 

1992 591 299 120 53 1,609 644 

1993 2,296 1,588 248 148 3,656 1,926 

1994 2,420 1,223 193 133 3,941 1,633 

1995 5,948 3,260 189 98 7,775 3,580 

1996 3,159 1,738 275 132 4,750 2,064 

1997 3,110 1,288 176 56 3,869 1,383 

1998 1,991 797 359 241 2,563 1,027 

1999 1,674 503 305 123 2,165 553 

2000 2,865 1,255 330 180 3,519 1,390 

2001 1,283 521 564 243 1,978 684 

2002 1,368 528 101 64 1,533 549 

2003 676 272 222 47 1,253 458 

2004 467 184 83 71 751 390 

2005 209 131 271 133 805 319 

2006 662 413 1,174 950 2,188 1,528 

2007 1,266 517 355 167 2,200 683 

2008 1,341 629 464 174 2,427 859 

2009 1,904 729 512 269 3,572 1,134 

2010 1,572 670 468 186 2,933 976 

2011 2,119 933 375 161 4,244 1,491 

32 
Figure 1. -- National Marine Fisheries Service eastern Bering Sea standard bottom trawl area surveyed by FV Alas

Aldebaran from 5 June to 31 July 2011. Shaded area depicts Bristol Bay resample stations, 25 to 31 Ju

33 
Figure 2. -- Alaska Department of Fish and Game commercial crab management units within the 2011 eastern Ber

survey area. Grey areas represent stations included in in the Pribilof District and St. Matthew Island SeDistrict sampling strata and circles represent the high-density sampling areas. 

34 
Mean net width (m)

20.0 19.0 18.0 17.0 16.0 15.0 14.0 13.0 12.0 

11.0 

10.0 

Average variable net width (m) Fixed net width (m) 

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

Figure 3. -- Fixed and average variable net widths (SD) used to calculate area swept by National Marine Fisheries 

Bering Sea standard bottom trawls from 1975 to the present. 

35 
Figure 4. -- Mean bottom temperatures (°C) measured at stations from the National Marine Fisheries Service easte

trawl survey, beginning 5 June 2011 in Bristol Bay and ending on 25 July 2011 at K-27. This figure dostations resampled in Bristol Bay from 25 to 31 July 2011. 

36 
Figure 5. -- Mean bottom temperatures (°C) measured at the 20 resample stations in Bristol Bay, surveyed from 25 

37 
500,000

Total biomass (t)
 

450,000 400,000 350,000 300,000 250,000 200,000 

St. Matthew Island Blue KinPribilof Islands Blue King CPribilof Islands Red King CrBristol Bay Red King Crab Tanner crab Snow crab 

0 

50,000 

100,000 150,000 

1975 1980 1985 1990 1995 2000 2005 

Figure 6. -- Historical mature male biomass for six commercial species caught on National Marine Fisheries Servi

bottom trawl surveys. 

38 
Figure 7. -- Total density (number/nmi2) of red king crab (Paralithodes camtschaticus) at each station sampled in 

District. Data depicted by circles are equal interval densities, while stars are densities larger than the stOutlined area depicts the management district and the resurveyed stations outlined in grey within the m

39 
Figure 8. --Percentage of male and female red king crab (Paralithodes camtschaticus) size classes caught at each s

Bay District in 2011. Outlined area depicts management district and the 20 resurveyed stations are outl

40 
Figure 9. --Percent frequency of occurrence of mature male red king crab (Paralithodes camtschaticus) at stations 

Bristol Bay District. 

41 
12
 

2009 10
 

8
 

6
 

4
 

2
 

0
 

Very Old 

Old 

New - Hard 

Soft & Molting 

0 25 50 75 100 125 150 175 200
 

12
 2010
 10
 

8
 

6
 

4
 

2
 

0
 

0 25 50 75 100 125 150 175 200
 

Very Old 

Old 

New -Har 

Soft & M 

rd 

Molting 

0 

2 

4 

6 

8 

10 

12 

2011 Very Old 

Old 

New -Hard 

Soft & Molting 

0 25 50 75 100 125 150 175 200
 

Carapace length (mm)
 

Figure 10. --Size-frequency of Bristol Bay District male red king crab (Paralithodes 

camtschaticus) by 5 mm length classes, 2009-2011. 

42
 
Figure 11. -- Distribution of legal-sized male red king crab (Paralithodes camtschaticus) caught at each station in 

District and distinguished by shell condition. Outlined area depicts management district and the 20 reoutlined in grey. 

43 
Figure 12a 

Figure 12b 

Figure 12. -- Changes in the distribution and egg condition of female red king crab (Paralithodes 

camtschaticus) caught (a) Leg 1 (5-17, June 2011) and (b) Leg 3 (25 to 31 July) in 

the Bristol Bay District. Outline depicts the 20 stations resampled in late July on Leg 

3. 

44 
0 

2 

4 

6 

8 

10 

12 

14 

Crab abundance (millions) 

2011 

Very Old 

Old 

New -Hard 

Soft & Molting 

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170
 

14
 

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170
 

Carapace length (mm)
 

Figure 13. -- Size-frequency and egg condition of Bristol Bay District female red king crab 

(Paralithodes camtschaticus) by 5 mm length classes in 2011. 

0 

2 

4 

6 

8 

10 

12 

Crab abundance (millions) 

2011 Barren 

Empty Egg Cases 

Eyed Eggs 

Uneyed Eggs 

Immature 

45
 
St. Paul Is. 

St. George Is. 

Figure 14. -- Total density (number/nmi2) of red king crab (Paralithodes camtschaticus) at each station sampled in 

in 2011. Data depicted by circles are equal interval densities and outlined area depicts stations within 

district. 

46 
St. Paul Is. 

St. George Is. 

Figure 15. -- Percentage of male and female red king crab (Paralithodes camtschaticus) size classes at e

Pribilof District in 2011. The outlined area depicts stations within the management district

47 
Figure 16. -- Percent frequency of occurrence of mature male red king crab (Paralithodes camtschaticus) at station

2011 Pribilof District. 

48 
0.0 

0.1 

Very Old 

Old 

New - Hard 

Soft & Molting 

2009

0.2 

0 25 50 75 100 125 150 175 200
 

0.2 

0.1 

0 

2010 Very Old 

Old 

New -Hard 

Soft & Molting 

0 25 50 75 100 125 150 175 200
 

0.2 

0.1 

0 

Carapace length (mm) 

Figure 17. -- Size-frequency of Pribilof District male red king crab (Paralithodes camtschaticus) 

by 5 mm length classes, 2009-2011.
 

49
 

Crab abundance (miliions) 

2011 Very Old 

Old 

New - Hard 

Soft & Molting 

0 25 50 75 100 125 150 175 200
 
St. Paul Is. 

St. George Is. 

Figure 18. -- Distribution of legal-sized male red king crab (Paralithodes camtschaticus) caught at each station of 

in 2011 and distinguished by shell condition. The outlined area depicts stations within the managem

50 
 

0.12
 Crab abundance (millions) Crab abundance (miliions) 0.08 

0.06 

0.04 

0.02 

0.1
 

2011 Very Old 

Old 

New - Hard 

Soft & Molting 

0 25 50 75 100 125 150 175
 0 

0.12 

0.1 

0.08 

0.06 

0.04 

0.02 

0 

2011
 Barren 

Empty Egg Cases 

Eyed Eggs 

Uneyed Eggs 

Immature 

0 25 50 75 100 125 150 175
 

Carapace length (mm)
 

Figure 19. -- Size-frequency and egg condition of Pribilof District female red king crab 

(Paralithodes camtschaticus) by 5 mm length classes in 2011.
 

51
 
St. Paul Is. 

St. George Is. 

Figure 20. -- Total density (number/nmi2) of blue king crab (Paralithodes platypus) at each station sampled in the P

2011.The outlined area depicts the management district. 

52 
St. Paul Is. 

St. George Is. 

Figure 21. -- Percentage of male and female blue king crab (Paralithodes platypus) size categories at each station 

District in 2011. The outlined area depicts stations within the management district. 

53 
Figure 22. --Percent frequency of occurrence of mature male blue king crab (Paralithodes platypus) at stations sam

Pribilof District. 

54 
0.10 

2009 

0.05 

0.00 

0.10 

2010
 

0.05 

0.00
 0 25 50 75 100 125 150 175 200
 

Very Old 

Old 

New -Hard 

Soft & Molting 

0.10 

2011
 Very Old 

Old 

New - Hard 

Soft &Motling 

0.05 

0.00
 0 25 50 75 100 125 150 175 200
 

Carapace length (mm)
 

Figure 23. --Size-frequency of Pribilof District male blue king crab (Paralithodes platypus) by 5 

mm length classes, 2009-2011.
 

55
 

Very Old 

Old 

New - Hard 

Soft & Molting 

0 25 50 75 100 125 150 175 200
 

Crab abundance (millions)
St. Paul Is. 

St. George Is. 

Figure 24. -- Distribution of legal-sized male blue king crab (Paralithodes platypus) caught at each station of the P

2011 and distinguished by shell condition. The outlined area depicts stations within the management 

56 
Crab abundance (millions) Crab abundance (millions) 

0.02 2011 

0.01 

0 

Very Old 

Old 

New - Hard 

Soft &Motling 

0 25 50 75 100 125
 

0.02 

2011
 

0.01 

Barren 

Empty Egg 

Cases 

Eyed Eggs 

Uneyed Eggs 

Immature 

0 25 50 75 100 125
 

Carapace length (mm)
 

Figure 25. -- Size-frequency, shell and egg condition of Pribilof District female blue king crab 

(Paralithodes platypus) by 5 mm length classes in 2011.
 

57
 

150 

0 

150 
St. Matthew Is. 

Figure 26. -- Total density (number/nmi2) of blue king crab (Paralithodes platypus) at each station sampled in the 

Section of the Northern District in 2011. Data depicted by circles are equal interval densities, while slarger than the standard scale. The outlined area depicts stations within the St. Matthew Island Sectio

58 
St. Matthew Is. 

Figure 27. -- Percentage of male and female blue king crab (Paralithodes platypus) size categories at each station 

Island Section of the Northern District in 2011. The outlined area depicts stations within the St. Mattsampling strata. 

59 
Figure 28. -- Percent frequency of occurrence of mature male blue king crab (Paralithodes platypus) at stations in 

Island Section sampling strata of the Northern District. 

60 
1.50 

1.00 

0.50 

0.00 

2009 

Very Old 

Old 

New - Hard 

Soft & Molting 

0 25 50 75 100 125 150 175 200
 

Crab abundance (millions) 1.00 

1.50 

2010 

0.50 

0.00 

0.00 

0.50 

1.00 

1.50 

0 25 50 75 100 125 150 175 200 

Very Old 

Old 

New -Hard 

Soft & Molting 

2011 

Very Old

Old 

New -Hard 

Soft & Molting 

0 25 50 75 100 125 150 175 200 

Carapace length (mm) 

Figure 29. -- Size-frequency of St. Matthew Island Section male blue king crab (Paralithodes 

platypus) by 5 mm length classes, 2009-2011. 

61 
St. Matthew Is. 

Figure 30. --Distribution of legal-sized male blue king crab (Paralithodes platypus) caught at each station of the S

Section of the Northern District in 2011 and distinguished by shell condition. The outlined area depict

St. Matthew Island Section sampling strata. 

62 
Crab abundance (millions) Crab abundnace (millions) 

2011 0.12 

0.1 

0.08 

Very Old 

Old 

New -Hard 

Soft & Molting 

0.06 

0.04 

0.02 

0 

0 10 20 	 30 40 50 60 70 80 90 100 
 

0.12 2011
 

0.1 

0.08 

0.06 

0.04 

Barren 

Empty Egg Cases 

Eyed Eggs 

Uneyed Eggs 

Immature 

0.02 

0 

0 10 20 30 40 50 60 70 80 90 100 	 
 

Carapace length (mm)
 

Figure 31. --Size-frequency, shell and egg condition of St. Matthew Island Section female blue king 

crab (Paralithodes platypus) by 5 mm length classes in 2011. 

63
 
Figure 32. --Total density (number/nmi2) of Tanner crab (Chionoecetes bairdi) at each station sampled in 2011. D

are crab densities at equal intervals, while stars are densities larger than the standard scale. 

64 
Figure 33. -- Percent frequency of occurrence of legal-sized male Tanner crab (Chionoecetes bairdi) at stations sam

65 
Figure 34. -- Percentage of male and female Tanner crab (Chionoecetes bairdi) size categories at each station sam

crab males ≥ 138 mm CW east of 166° W and ≥ 125 mm CW west of 166° W are preferred size cate

120 mm and ≥ 110 mm CW are the legal-size categories for east and west of 166° W, respectively. 

66 
45.0 

Small claw males < 0.18 mm 

40.0 

Large claw males ≥ 0.18 mm 

35.0 30.0 25.0 20.0 15.0 10.0 

5.0 0.0 

0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 16

Carapace width (mm) 

Figure 35. --Male Tanner crab (Chionoecetes bairdi) chela height versus carapace width measurements collected o

National Marine Fisheries Service eastern Bering Sea bottom trawl surveys. 

67 

Chela height (mm)
 
40 2009 35 

0 

5 

10 

15 

20 

25 

30 Very Old

Old 

New - Hard 

Soft & Molting 

0 25 50 75 100 125 150 175 200
 

0 

5 

10 

15 

20 

25 

30 

35 

40 

Crab abundance (millions)

2010 Very Old 

Old 

New -Hard 

Soft & Molting 

0 25 50 75 100 125 150 175 200
 

0 

5 

10 

15 

20 

25 

30 

35 

40 

2011 

Very Old 

Old 

New - Hard 

Soft & Molting 

0 25 50 75 100 125 150 175 200 

Carapace width (mm) 

Figure 36. --Size-frequency of male Tanner crab (Chionoecetes bairdi) by 5 mm width classes of all 

districts combined, 2009-2011. 

68 
Figure 37. -- Distribution of legal-sized male Tanner crab (Chionoecetes bairdi) caught at each station in 2011 and 

shell condition. Tanner male crab ≥ 120 mm and ≥ 110 mm CW are the legal-size categories for east 

respectively. 

69 
Crab abundance (millions) Crab abundance (millions) 

35
 

30
 

25
 

20
 

15
 

10
 

5
 

0
 

35
 2011
 

30
 

25
 

20
 

15
 

10
 

5
 

0 

Carapace width (mm) 

2011 Very Old 

Old 

New - Hard 

Soft & Molting 

0 10 20 30 40 50 60 70 80 90 100 110 
 

Barren 

Empty Egg Cases 

Eyed Eggs 

Uneyed Eggs 

Immature 

10 20 30 40 50 60 70 80 90 100 110 
 

Figure 38. -- Size-frequency, shell and egg condition of female Tanner crab (Chionoecetes bairdi) 

by 5 mm width classes of all districts combined in 2011. 

70
 

0 
Figure 39. --Percent frequency of occurrence of legal-sized male snow crab (Chionoecetes opilio) at stations samp

71 
Figure 40. --Total density (number/nmi2) of snow crab (Chionoecetes opilio) at each station sampled in 2011. Data 

are crab densities at equal intervals. 

72 
Figure 41. -- Percentage of male and female snow crab (Chionoecetes opilio) size categories at each station samp

73 
40

Chela height (mm)
 

Small claw males < 0.20 

35

Large claw males ≥ 0.20 

3025201510

50

0 15 30 45 60 75 90 105 120 135 

Carapace width (mm) 

Figure 42. -- Male snow crab (Chionoecetes opilio) chela height versus carapace width measurements collected d

2011 National Marine Fisheries Service eastern Bering Sea bottom trawl surveys. 

74
600
 2009

450
 

300
 

150
 

Very Old 

Old 

New - Hard 

Soft & Molting 

0 

0 25 50 75 100 125 150 175 200
 

0 25 50 75 100 125 150 175 200
 0 

150 

300 

450 

600

Crab Abundance (millions)

2010 Very Old 

Old 

New -Hard 

Soft & Molting 

600
 2011
 

450
 

Very Old 

Old 

New - Hard 

Soft & Motling 

300
 

0 

150 

0 25 50 75 100 125 150 175 200
 

Carapace width (mm)
 

Figure 43. -- Size-frequency of male snow crab (Chionoecetes opilio) by 5 mm width classes of 

all districts combined, 2009-2011.
 

75
 
Figure 44. -- Distribution of legal-sized male snow crab (Chionoecetes opilio) caught at each station in 2011 and d

condition. 

76 
Crab abundance (millions) 

1600
 

1400
 

1200
 

1000
 

800
 

600
 

400
 

200
 

0
 

2011 

Very Old 

Old 

New - Hard 

Soft & Motling 

0 10 20 30 40 50 60 70 80 90 100 
 

1600
 2011
 

0 10 20 30 40 50 60 70 80 90 100 
 

Carapace width (mm)
 

Figure 45. -- Size-frequency, shell and egg condition of female snow crab (Chionoecetes opilio) 

by 5 mm width classes of all districts combined in 2011. 

0 

200 

400 

600 

800 

1000 

1200 

1400

Crab abundance (millions) 

Barren 

Empty Egg Cases 

Eyed Eggs 

Uneyed Eggs 

Immature 

77
 
Figure 46. -- Total density (number/nmi2) of Chionoecetes bairdi/opilio hybrid crab at each station sampled in 20

circles are crab densities at equal intervals. 

78 
Figure 47. -- Percentage of male and female Chionoecetes bairdi/opilio hybrid crab size categories at each station 

79 
Figure 48. -- Total density (number/nmi2) and percentage of male and female red king crab (Paralithodes camtsch

categories at each station sampled in the Northern District in 2011. 

80 
Figure 49. -- Total density (number/nmi2) and percentage of male and female blue king crab (Paralithodes platyp

stations sampled outside of the Pribilof District and St. Matthew Island section of the Northern Distri

81 
Figure 50. -- Total density (number/nmi2) and percentage of male and female hair crab (Erimacrus isenbeckii) siz

station sampled in 2011. 

82 
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station A-02 A-03 A-04 A-05 A-06 AZ0504 B-01 B-02 B-0Start Date 07/14/2011 06/25/2011 06/25/2011 06/24/2011 06/24/2011 06/24/2011 07/14/2011 07/14/2011 06/25/201Duration (hour) 0.49 0.55 0.51 0.57 0.51 0.60 0.56 0.49 0.5

Distance Fished (km) 2.66 2.97 2.83 3.15 2.81 3.13 2.98 2.66 3.0

Mid-Latitude (oN) 55.01 55.01 55.00 54.99 55.03 54.84 55.34 55.35 55.3

Mid-Longitude (oW) -166.94 -166.32 -165.77 -165.15 -164.59 -165.52 -167.55 -166.97 -166.3

Bottom Depth (m) 155 142 130 111 63 154 148 138 13

Bottom Temperature (oC) 3.9 3.8 4.2 4.3 5.6 3.8 3.8 3.8 3

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

26,582 7,150 1,834 807 0 21,659 2,879 3,359 3,59

 Legal 

2,064 2,362 1,199 993 0 3,318 1,243 1,269 2,31

 Preferred 

917 1,468 564 621 0 1,628 654 672 1,47

 Immature females 

22,036 6,831 2,257 434 0 30,548 2,879 1,568 1,98

 Mature females 

459 1,851 71 62 0 0 981 1,568 1,15

 Total weight (kg) 

44.03 58.91 19.69 24.89 0.00 71.60 22.83 20.62 36.0

Opilio Tanner Crab Sublegal 

0 0 0 62 0 63 0 0 

 Legal 

306 0 141 2,420 0 2,629 65 75 25

 Preferred 

153 0 71 2,172 0 2,566 65 75 25

 Immature females 

0 0 0 0 0 0 0 75 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

1.71 0.00 0.86 24.34 0.00 28.43 0.80 0.58 2.9

Hybrid Tanner Crab Males 

≤ 77 mm 76 0 0 0 0 0 0 0 

 Males 

≥ 78 mm 153 0 71 0 0 0 0 0 12

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

2.25 0.00 0.74 0.00 0.00 0.00 0.00 0.00 1.5

83
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station B-06 B-07 B-08 C-01 C-02 C-03 C-04 C-05 C-0Start Date 06/24/2011 06/11/2011 06/11/2011 07/14/2011 07/14/2011 06/25/2011 06/25/2011 06/24/2011 06/24/201Duration (hour) 0.50 0.35 0.48 0.53 0.50 0.53 0.51 0.54 0.5

Distance Fished (km) 2.82 1.90 2.64 2.90 2.77 2.85 2.74 2.95 2.7

Mid-Latitude (oN) 55.34 55.34 55.34 55.67 55.68 55.67 55.67 55.67 55.6

Mid-Longitude (oW) -164.55 -164.02 -163.43 -167.59 -166.98 -166.39 -165.80 -165.16 -164.5

Bottom Depth (m) 101 78 52 134 134 126 117 109 9

Bottom Temperature (oC) 4.6 3.9 4.7 3.8 3.8 3.8 4.0 4.1 3

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 892 0 0 0 0 0 7

 Legal 

0 0 649 0 0 0 0 0 7

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 162 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 34.77 0.00 0.00 0.00 0.00 0.00 2.4

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

3,246 217 162 854 338 1,460 3,757 14,611 2,76

 Legal 

6,926 217 324 328 540 1,079 1,134 2,812 76

 Preferred 

4,689 109 81 0 473 635 354 1,235 23

 Immature females 

794 0 81 328 270 1,714 4,324 9,055 1,38

 Mature females 

4,040 0 0 0 0 1,587 354 1,921 7

 Total weight (kg) 

123.70 2.14 3.80 3.21 6.75 19.78 22.52 69.96 11.6

Opilio Tanner Crab Sublegal 

216 0 0 66 68 0 0 69 7

 Legal 

2,381 0 0 0 270 63 142 617 69

 Preferred 

1,731 0 0 0 270 63 142 274 61

 Immature females 

0 0 0 0 0 127 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

19.10 0.00 0.00 0.13 3.22 0.76 1.35 5.08 5.6

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 0 0 0 0 

 Males 

≥ 78 mm 289 0 0 0 0 0 0 0 15

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

3.10 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.7

84
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station C-09 C-18 D-01 D-02 D-03 D-04 D-05 D-06 D-0Start Date 06/10/2011 07/14/2011 06/26/2011 06/26/2011 06/25/2011 06/25/2011 06/24/2011 06/15/2011 06/11/201Duration (hour) 0.49 0.55 0.56 0.57 0.55 0.50 0.56 0.49 0.3

Distance Fished (km) 2.70 3.03 3.06 3.09 2.96 2.71 3.02 2.67 1.9

Mid-Latitude (oN) 55.67 55.67 56.00 56.00 56.00 56.01 56.00 56.00 56.0

Mid-Longitude (oW) -162.84 -168.20 -167.62 -167.01 -166.41 -165.79 -165.18 -164.59 -164.0

Bottom Depth (m) 53 135 133 134 124 106 96 92 9

Bottom Temperature (oC) 4.4 3.5 3.4 3.6 3.7 3.6 3.3 2.2 2

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

174 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

1,302 0 0 0 0 0 0 0 

 Total weight (kg) 

25.95 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

174 2,089 1,516 1,461 332 3,445 3,428 679 6,44

 Legal 

174 457 243 468 1,659 1,837 538 377 69

 Preferred 

0 131 182 351 995 230 134 0 

 Immature females 

0 1,763 910 1,228 1,062 1,378 4,840 151 5,87

 Mature females 

0 65 0 409 1,725 1,531 202 151 34

 Total weight (kg) 

1.79 6.58 3.29 11.23 26.15 34.70 17.33 6.32 9.1

Opilio Tanner Crab Sublegal 

0 0 0 0 0 153 202 151 23

 Legal 

0 392 61 58 133 383 605 151 57

 Preferred 

0 392 61 58 133 306 471 75 34

 Immature females 

0 0 0 117 199 77 0 0 

 Mature females 

0 0 0 0 133 153 0 0 

 Total weight (kg) 

0.00 4.93 0.67 0.24 2.51 3.49 7.00 1.46 3.0

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 0 0 0 0 

 Males 

≥ 78 mm 0 65 0 0 0 230 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 0.91 0.00 0.00 0.00 1.74 0.00 0.00 0.0

85
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station D-10 D-18 E-01 E-02 E-03 E-04 E-05 E-06 E-0Start Date 06/10/2011 06/27/2011 06/26/2011 06/26/2011 06/25/2011 06/25/2011 06/15/2011 06/15/2011 06/11/201Duration (hour) 0.50 0.60 0.56 0.52 0.55 0.52 0.54 0.49 0.5

Distance Fished (km) 2.73 3.34 3 2.85 2.98 2.88 2.86 2.66 2.8Mid-Latitude (oN) 56.00 55.99 56.34 56.34 56.33 56.32 56.33 56.33 56.3

Mid-Longitude (oW) -162.25 -168.22 -167.66 -167.04 -166.41 -165.80 -165.20 -164.59 -164.0

Bottom Depth (m) 71 149 128 113 103 92 86 86 8

Bottom Temperature (oC) 3.9 3.8 3.4 3.3 3.2 2.5 2.1 2.4 1

Red King Crab Immature males 

3,451 0 0 0 0 0 0 0 

 Mature males 

225 0 0 0 0 0 0 0 

 Legal 

225 0 0 0 0 0 0 0 

 Immature females 

1,726 0 0 0 0 0 0 0 

 Mature females 

2,551 0 0 0 0 0 0 0 

 Total weight (kg) 

80.81 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

1,426 361 1,405 1,456 2,203 2,580 4,896 3,593 11,17

 Legal 

375 361 894 2,288 895 502 288 76 44

 Preferred 

75 241 639 693 344 143 72 0 7

 Immature females 

75 1,083 1,788 1,178 2,616 1,505 3,960 1,605 10,80

 Mature females 

0 0 319 1,178 207 502 504 76 44

 Total weight (kg) 

11.05 5.73 16.45 27.88 13.16 13.43 13.63 4.38 15.8

Opilio Tanner Crab Sublegal 

0 0 0 0 138 143 288 76 44

 Legal 

0 301 255 693 413 358 792 229 51

 Preferred 

0 301 192 416 344 287 504 153 22

 Immature females 

0 0 0 208 138 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 3.35 2.36 5.36 4.25 3.44 6.33 1.62 3.7

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 0 0 0 0 

 Males 

≥ 78 mm 0 0 0 208 0 143 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 208 0 0 0 0 

 Total weight (kg) 

0.00 0.00 0.00 2.46 0.00 1.19 0.00 0.00 0.0

86
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station E-10 E-11 E-12 E-18 E-19 E-20 E-21 E-22 F-0Start Date 06/10/2011 06/07/2011 06/07/2011 06/27/2011 06/27/2011 06/28/2011 06/28/2011 06/29/2011 06/26/201Duration (hour) 0.51 0.54 0.50 0.58 0.55 0.42 0.59 0.55 0.5

Distance Fished (km) 2.86 2.90 2.74 3.16 3.11 2.19 3.11 2.97 2.7

Mid-Latitude (oN) 56.33 56.33 56.34 56.33 56.34 56.36 56.34 56.34 56.6

Mid-Longitude (oW) -162.19 -161.63 -160.98 -168.25 -168.88 -169.45 -170.09 -170.69 -167.6

Bottom Depth (m) 75 65 53 154 129 135 109 121 10Bottom Temperature (oC) 2.7 4.0 3.9 3.6 3.6 3.6 3.4 3.5 3

Red King Crab Immature males 

147 998 401 0 0 0 0 0 

 Mature males 

881 1,381 722 0 0 0 0 0 

 Legal 

735 921 481 0 0 0 0 0 

 Immature females 

0 77 0 0 0 0 0 0 

 Mature females 

0 3,530 802 0 0 0 0 0 

 Total weight (kg) 

33.30 124.85 40.20 0.00 0.00 0.00 0.00 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

1,763 384 401 7,806 320 1,974 2,140 1,592 4,78

 Legal 

220 153 401 4,372 1,215 172 856 133 14

 Preferred 

73 0 0 2,498 320 0 306 0 

 Immature females 

881 77 0 7,182 895 1,630 2,018 1,194 3,60

 Mature females 

147 153 80 125 511 0 245 0 7

 Total weight (kg) 

7.76 3.44 4.80 50.09 16.52 1.25 13.92 2.30 2.6

Opilio Tanner Crab Sublegal 

0 0 0 0 0 0 183 0 

 Legal 

514 0 0 62 3,964 343 367 66 1,10

 Preferred 

367 0 0 62 3,772 257 306 66 95

 Immature females 

0 0 0 0 0 0 367 0 

 Mature females 

0 0 0 0 0 86 0 0 7

 Total weight (kg) 

4.01 0.00 0.00 0.64 44.16 2.38 4.31 0.70 9.8

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 0 0 0 0 

 Males 

≥ 78 mm 220 0 0 1,187 1,087 0 0 0 22

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

1.19 0.00 0.00 12.47 13.44 0.00 0.00 0.00 1.5

87
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station F-04 F-05 F-06 F-07 F-08 F-09 F-10 F-11 F-1Start Date 06/16/2011 06/15/2011 06/15/2011 06/11/2011 06/12/2011 06/10/2011 06/10/2011 06/07/2011 06/07/201Duration (hour) 0.49 0.54 0.50 0.54 0.50 0.52 0.49 0.55 0.5

Distance Fished (km) 2.64 2.97 2.73 2.96 2.72 2.80 2.70 2.78 2.7

Mid-Latitude (oN) 56.64 56.67 56.67 56.67 56.67 56.67 56.66 56.68 56.6

Mid-Longitude (oW) -165.82 -165.22 -164.59 -164.02 -163.37 -162.79 -162.19 -161.58 -160.9

Bottom Depth (m) 79 75 75 75 74 72 71 90 6

Bottom Temperature (oC) 2.4 2.7 2.5 1.5 1.8 1.9 3.0 2.6 3

Red King Crab Immature males 

0 0 0 0 0 0 0 329 2,27

 Mature males 

0 0 0 0 0 0 161 3,047 2,35

 Legal 

0 0 0 0 0 0 161 1,894 1,56

 Immature females 

0 0 0 0 0 0 0 0 31

 Mature females 

0 0 0 0 0 0 0 329 2,66

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 0.00 4.85 86.15 134.1

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

8,358 38,308 9,115 71,021 2,647 43,646 401 741 2,82

 Legal 

315 139 377 221 0 75 482 577 39

 Preferred 

0 69 75 0 0 0 241 82 15

 Immature females 

9,755 36,596 6,780 49,222 3,252 27,184 0 82 31

 Mature females 

79 69 75 0 76 179 0 82 2,19

 Total weight (kg) 

14.68 36.17 15.67 115.19 6.48 89.51 5.51 7.44 17.2

Opilio Tanner Crab Sublegal 

789 69 75 516 0 302 0 0 

 Legal 

1,577 347 603 295 151 302 482 1,235 

 Preferred 

1,104 208 226 74 151 0 401 988 

 Immature females 

158 0 0 0 0 0 0 0 

 Mature females 

0 69 0 0 0 0 0 0 

 Total weight (kg) 

11.30 2.48 3.17 2.44 1.20 2.09 3.43 8.39 0.0

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 0 0 0 0 

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

88
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station F-18 F-19 F-20 F-21 F-22 F-23 F-24 F-25 G-0

Start Date 06/27/2011 06/27/2011 06/28/2011 06/28/2011 06/29/2011 07/11/2011 07/11/2011 07/15/2011 06/20/201Duration (hour) 0.51 0.42 0.54 0.56 0.56 0.48 0.52 0.53 0.5

Distance Fished (km) 2.75 2.17 2.98 3.10 3.02 2.57 2.82 2.90 2.9

Mid-Latitude (oN) 56.66 56.68 56.67 56.67 56.67 56.67 56.66 56.67 57.0

Mid-Longitude (oW) -168.30 -168.91 -169.52 -170.10 -170.74 -171.37 -171.98 -172.56 -167.6

Bottom Depth (m) 106 100 80 95 113 118 126 136 7

Bottom Temperature (oC) 3.3 3.4 4.5 3.8 3.4 3.6 3.7 3.7 3

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

1,256 1,065 137 5,418 3,773 490 223 510 47,06

 Legal 

1,256 5,235 410 457 692 654 0 0 97

 Preferred 

443 3,549 342 196 377 163 0 0 20

 Immature females 

1,256 1,863 68 2,089 3,899 490 74 582 54,78

 Mature females 

74 444 0 1,697 63 0 0 0 1,39

 Total weight (kg) 

11.40 51.07 4.53 23.89 12.19 5.31 0.39 0.95 35.6

Opilio Tanner Crab Sublegal 

739 0 0 65 63 0 0 0 17,33

 Legal 

3,547 1,952 478 261 1,258 6,130 0 0 5,98

 Preferred 

2,808 1,952 478 196 1,132 5,803 0 0 2,92

 Immature females 

0 0 0 196 0 0 0 0 21,44

 Mature females 

3,104 0 0 0 63 0 0 0 55

 Total weight (kg) 

33.40 9.54 4.13 2.50 12.30 48.79 0.00 0.00 51.5

Hybrid Tanner Crab Males 

≤ 77 mm 74 0 0 0 0 0 0 0 

 Males 

≥ 78 mm 1,330 89 0 131 0 736 0 0 55

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

222 0 0 0 0 0 0 0 34

 Total weight (kg) 

11.66 0.82 0.00 0.63 0.00 5.49 0.00 0.00 4.5

89
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station G-04 G-05 G-06 G-07 G-08 G-09 G-10 G-11 G-1Start Date 06/16/2011 06/15/2011 06/15/2011 06/11/2011 06/12/2011 06/09/2011 06/09/2011 06/07/2011 06/08/201Duration (hour) 0.48 0.53 0.48 0.54 0.49 0.52 0.51 0.54 0.5

Distance Fished (km) 2.62 2.92 2.64 2.91 2.69 2.76 2.74 2.83 2.7

Mid-Latitude (oN) 56.98 57.00 57.00 57.00 57.00 57.00 57.01 57.00 57.0

Mid-Longitude (oW) -165.85 -165.23 -164.60 -164.03 -163.39 -162.79 -162.16 -161.56 -160.9

Bottom Depth (m) 73 71 70 69 65 61 60 69 6

Bottom Temperature (oC) 1.6 1.2 2.0 1.2 2.0 2.1 2.3 2.8 3

Red King Crab Immature males 

0 0 0 0 0 0 0 396 51

 Mature males 

0 0 0 0 0 75 77 554 74

 Legal 

0 0 0 0 0 75 77 317 51

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 75 0 396 81

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 4.16 2.12 21.69 42.1

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

16,478 26,549 827 20,743 1,508 753 384 0 2,07

 Legal 

766 0 0 73 0 0 154 79 

 Preferred 

0 0 0 0 0 0 154 0 

 Immature females 

7,280 14,816 331 8,268 317 151 77 0 59

 Mature females 

502 271 0 0 79 0 0 79 1,26

 Total weight (kg) 

43.32 39.43 0.48 21.10 3.36 2.81 3.09 0.66 8.5

Opilio Tanner Crab Sublegal 

2,158 907 165 218 0 75 0 0 

 Legal 

8,392 767 331 363 79 527 384 158 

 Preferred 

6,793 418 165 145 79 226 308 79 

 Immature females 

480 70 0 0 0 0 0 0 

 Mature females 

3,836 279 83 145 0 0 0 0 

 Total weight (kg) 

55.06 5.71 2.13 2.95 0.58 2.74 2.64 0.95 0.0

Hybrid Tanner Crab Males 

≤ 77 mm 160 1,325 248 0 0 0 0 0 

 Males 

≥ 78 mm 80 70 0 73 0 0 0 79 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

80 70 83 0 0 0 0 0 

 Total weight (kg) 

0.35 1.45 0.33 0.26 0.00 0.00 0.00 0.36 0.0

90
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station G-15 G-18 G-19 G-20 G-21 G-22 G-23 G-24 G-2Start Date 06/05/2011 06/27/2011 06/28/2011 06/29/2011 06/29/2011 06/29/2011 07/11/2011 07/11/2011 07/15/201Duration (hour) 0.53 0.51 0.52 0.51 0.52 0.55 0.45 0.56 0.5

Distance Fished (km) 2.83 2.85 2.80 2.86 2.79 3.05 2.39 3.04 2.9

Mid-Latitude (oN) 56.99 56.99 57.00 56.99 57.00 57.01 57.00 57.00 57.0

Mid-Longitude (oW) -159.14 -168.34 -168.95 -169.55 -170.16 -170.79 -171.40 -172.03 -172.6

Bottom Depth (m) 34 81 79 60 68 95 108 116 12

Bottom Temperature (oC) 4.0 3.4 3.1 1.7 3.4 3.1 3.2 3.4 3

Red King Crab Immature males 

74,644 0 0 0 0 0 0 0 

 Mature males 

87 0 0 0 2,293 0 0 0 

 Legal 

0 0 0 0 2,219 0 0 0 

 Immature females 

75,173 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 444 0 0 0 

 Total weight (kg) 

141.32 0.00 0.00 0.00 131.31 0.00 0.00 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 74 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.09 0.00 0.00 0.00 0.0

Bairdi Tanner Crab Sublegal 

0 4,197 295 5,086 10,002 21,922 607 273 28

 Legal 

0 2,678 442 1,625 41,849 1,160 347 137 

 Preferred 

0 724 74 989 29,216 709 260 68 

 Immature females 

0 4,415 589 5,439 74 21,528 1,040 273 64

 Mature females 

0 579 0 918 3,625 1,804 0 0 7

 Total weight (kg) 

0.00 28.13 4.19 26.95 413.41 56.38 2.52 1.13 0.4

Opilio Tanner Crab Sublegal 

0 507 74 212 74 515 260 137 7

 Legal 

0 651 1,767 353 518 1,224 5,028 2,870 4,85

 Preferred 

0 507 1,620 283 370 1,095 4,422 2,665 4,71

 Immature females 

0 507 74 0 0 258 0 205 

 Mature females 

0 72 74 0 0 64 0 342 

 Total weight (kg) 

0.00 6.12 15.23 3.29 3.26 12.53 34.32 28.41 45.7

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 148 258 0 0 

 Males 

≥ 78 mm 0 868 442 141 1,258 64 0 137 14

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 507 0 0 0 0 0 0 

 Total weight (kg) 

0.00 7.95 4.04 1.10 5.74 0.57 0.00 1.39 1.2

91
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station GF2019 GF2120 GF2221 H-01 H-02 H-03 H-04 H-05 H-0Start Date 06/28/2011 06/29/2011 06/29/2011 06/20/2011 06/20/2011 06/16/2011 06/16/2011 06/15/2011 06/15/201Duration (hour) 0.51 0.51 0.55 0.51 0.50 0.52 0.49 0.52 0.4

Distance Fished (km) 2.80 2.79 2.97 2.87 2.71 2.85 2.68 2.87 2.6

Mid-Latitude (oN) 56.83 56.84 56.83 57.33 57.34 57.33 57.33 57.33 57.3

Mid-Longitude (oW) -169.26 -169.86 -170.49 -167.74 -167.13 -166.50 -165.87 -165.24 -164.6

Bottom Depth (m) 81 71 101 74 71 70 68 67 6

Bottom Temperature (oC) 3.3 3.7 3.2 2.6 2.1 0.7 0.4 0.2 0

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

74 0 0 0 0 0 0 0 

 Legal 

74 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 74 0 0 0 0 0 0 

 Total weight (kg) 

2.58 1.68 0.00 0.00 0.00 0.00 0.00 0.00 0.0

Bairdi Tanner Crab Sublegal 

662 809 13,346 19,233 13,270 8,833 78 215 50

 Legal 

588 2,723 1,042 955 610 292 0 0 

 Preferred 

221 1,913 651 294 305 73 0 0 

 Immature females 

662 0 9,570 19,924 8,759 1,022 0 0 8

 Mature females 

0 147 326 2,359 1,251 73 0 0 

 Total weight (kg) 

5.75 30.14 30.07 63.87 39.74 17.28 0.06 0.69 0.4

Opilio Tanner Crab Sublegal 

74 221 130 39,683 6,399 2,847 860 574 25

 Legal 

1,618 221 326 15,065 4,723 2,920 1,797 215 16

 Preferred 

1,398 147 260 7,055 1,447 1,679 1,563 143 

 Immature females 

74 0 65 18,813 457 803 0 72 25

 Mature females 

0 0 0 110,818 5,561 730 391 72 

 Total weight (kg) 

15.11 2.15 4.02 242.53 34.18 16.50 10.34 1.75 0.8

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 3,380 76 146 0 0 

 Males 

≥ 78 mm 294 221 0 1,029 0 219 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 294 0 0 0 0 

 Total weight (kg) 

2.08 1.64 0.00 8.54 0.12 0.74 0.00 0.00 0.0

92
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station H-09 H-10 H-11 H-12 H-13 H-14 H-15 H-16 H-1Start Date 06/09/2011 06/09/2011 06/08/2011 06/08/2011 06/06/2011 06/06/2011 06/05/2011 06/05/2011 06/28/201Duration (hour) 0.28 0.51 0.51 0.49 0.55 0.50 0.54 0.51 0.5

Distance Fished (km) 1.50 2.77 2.79 2.67 2.91 2.74 2.85 2.78 2.8

Mid-Latitude (oN) 57.34 57.35 57.34 57.33 57.34 57.33 57.34 57.33 57.3

Mid-Longitude (oW) -162.76 -162.14 -161.54 -160.94 -160.30 -159.67 -159.06 -158.42 -168.3

Bottom Depth (m) 49 51 57 61 61 56 49 32 7

Bottom Temperature (oC) 2.3 2.3 2.3 2.7 2.6 3.0 2.7 3.7 3

Red King Crab Immature males 

0 0 244 73 297 157 0 0 

 Mature males 

437 158 815 220 74 861 235 0 

 Legal 

146 158 652 0 0 313 235 0 

 Immature females 

0 0 0 0 0 235 235 0 

 Mature females 

437 0 0 146 1,483 2,505 235 0 

 Total weight (kg) 

9.91 6.26 22.99 8.62 35.18 67.51 13.31 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 7

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 1.3

Bairdi Tanner Crab Sublegal 

0 316 81 0 0 0 0 0 1,53

 Legal 

0 0 81 0 0 0 0 0 7

 Preferred 

0 0 81 0 0 0 0 0 

 Immature females 

0 79 0 0 0 0 0 0 87

 Mature females 

0 0 81 0 0 0 0 0 

 Total weight (kg) 

0.00 0.28 1.25 0.00 0.00 0.00 0.00 0.00 1.8

Opilio Tanner Crab Sublegal 

0 0 0 0 0 0 0 0 36

 Legal 

0 0 0 0 0 0 0 0 95

 Preferred 

0 0 0 0 0 0 0 0 73

 Immature females 

0 0 0 0 0 0 0 0 7

 Mature females 

0 0 0 0 0 0 0 0 14

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6.7

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 0 0 0 0 7

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 73

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 4.1

93
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station H-21 H-22 H-23 H-24 H-25 H-26 HG1918 HG2019 HG212Start Date 07/01/2011 07/01/2011 07/11/2011 07/15/2011 07/15/2011 07/15/2011 06/27/2011 06/28/2011 06/29/201Duration (hour) 0.50 0.54 0.50 0.52 0.53 0.51 0.53 0.50 0.5

Distance Fished (km) 2.73 2.97 2.74 2.78 2.91 2.85 2.93 2.73 2.8

Mid-Latitude (oN) 57.34 57.34 57.33 57.33 57.35 57.34 57.17 57.16 57.1

Mid-Longitude (oW) -170.22 -170.85 -171.47 -172.09 -172.81 -173.32 -168.61 -169.33 -169.8

Bottom Depth (m) 56 83 101 108 117 120 76 71 5

Bottom Temperature (oC) 3.8 2.9 2.9 3.1 3.3 3.4 3.5 2.1 3

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 29

 Legal 

0 0 0 0 0 0 0 0 29

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 19.8

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

0 14,097 1,301 0 576 441 612 4,231 15,27

 Legal 

79 3,117 230 74 0 221 204 705 3,24

 Preferred 

0 1,842 77 74 0 0 0 392 1,10

 Immature females 

0 11,759 1,760 0 576 441 884 4,857 3,24

 Mature females 

0 1,771 0 74 0 0 0 392 1,25

 Total weight (kg) 

0.41 42.30 2.21 1.16 0.47 2.79 3.28 11.26 57.8

Opilio Tanner Crab Sublegal 

0 567 536 883 72 0 204 548 

 Legal 

0 12,822 5,817 6,694 2,950 0 1,020 1,802 7

 Preferred 

0 11,972 4,975 4,120 2,878 0 680 1,175 7

 Immature females 

0 0 77 0 0 0 68 235 

 Mature females 

0 0 153 3,237 0 0 0 157 

 Total weight (kg) 

0.00 111.71 45.38 50.89 13.06 0.00 8.12 12.02 0.5

Hybrid Tanner Crab Males 

≤ 77 mm 0 71 0 0 0 0 0 0 

 Males 

≥ 78 mm 0 283 459 0 0 0 136 157 22

 Immature females 

0 71 77 0 0 0 0 0 

 Mature females 

0 0 0 294 0 0 0 0 

 Total weight (kg) 

0.00 2.43 3.75 0.55 0.00 0.00 0.77 1.03 0.7

94
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station I-02 I-03 I-04 I-05 I-06 I-07 I-08 I-09 I-1

Start Date 06/20/2011 06/16/2011 06/16/2011 06/15/2011 06/14/2011 06/12/2011 06/12/2011 06/09/2011 06/09/201Duration (hour) 0.50 0.52 0.49 0.54 0.47 0.51 0.52 0.29 0.5

Distance Fished (km) 2.73 2.98 2.69 2.95 2.56 2.78 2.85 1.46 2.9

Mid-Latitude (oN) 57.68 57.67 57.67 57.66 57.67 57.66 57.67 57.67 57.6

Mid-Longitude (oW) -167.12 -166.52 -165.88 -165.25 -164.62 -164.00 -163.40 -162.77 -162.1

Bottom Depth (m) 67 66 64 62 52 52 46 44 4

Bottom Temperature (oC) 1.1 0.9 0.8 0.8 2.2 1.7 2.1 2.2 2

Red King Crab Immature males 

0 0 0 0 0 0 0 0 22

 Mature males 

0 0 0 0 0 0 77 450 7

 Legal 

0 0 0 0 0 0 77 300 7

 Immature females 

0 0 0 0 0 0 0 0 7

 Mature females 

0 0 0 0 0 0 77 1201 44

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 0.00 3.31 14.14 11.7

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

77 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0

Bairdi Tanner Crab Sublegal 

4,321 890 79 72 0 0 0 0 

 Legal 

0 68 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

849 137 0 72 0 0 0 150 

 Mature females 

154 68 0 0 0 0 0 0 

 Total weight (kg) 

8.59 1.96 0.06 0.05 0.00 0.00 0.00 0.09 0.0

Opilio Tanner Crab Sublegal 

41,354 5,202 1,340 858 0 0 0 0 

 Legal 

15,585 1,301 79 0 0 0 0 0 

 Preferred 

9,104 684 0 0 0 0 0 0 

 Immature females 

4,706 548 315 286 0 0 0 0 

 Mature females 

19,983 616 236 143 0 0 0 0 

 Total weight (kg) 

130.68 10.68 1.28 0.90 0.00 0.00 0.00 0.00 0.0

Hybrid Tanner Crab Males 

≤ 77 mm 540 137 0 0 0 0 0 0 

 Males 

≥ 78 mm 540 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

2.09 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.0

95
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station I-13 I-14 I-15 I-16 I-18 I-19 I-20 I-21 I-2

Start Date 06/06/2011 06/06/2011 06/05/2011 06/05/2011 07/01/2011 07/02/2011 07/01/2011 07/07/2011 07/07/201Duration (hour) 0.53 0.51 0.28 0.53 0.50 0.52 0.52 0.49 0.5

Distance Fished (km) 2.82 2.80 1.51 2.89 2.78 2.85 2.87 2.69 2.7

Mid-Latitude (oN) 57.67 57.67 57.68 57.68 57.67 57.66 57.67 57.66 57.6

Mid-Longitude (oW) -160.28 -159.64 -159.02 -158.36 -168.41 -169.03 -169.65 -170.28 -170.9

Bottom Depth (m) 55 49 47 36 70 69 70 72 8

Bottom Temperature (oC) 2.2 2.3 2.5 3.6 3.6 2.8 0.3 3.1 2

Red King Crab Immature males 

466 0 432 0 0 0 0 0 

 Mature males 

544 298 0 0 78 0 0 0 

 Legal 

389 224 0 0 78 0 0 0 

 Immature females 

155 0 432 0 0 0 0 0 

 Mature females 

1,243 894 0 0 0 0 0 0 

 Total weight (kg) 

37.88 23.15 1.38 0.00 3.45 0.00 0.00 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

0 0 0 0 6,818 12,554 18,887 4,283 37

 Legal 

0 0 0 0 0 0 193 0 7

 Preferred 

0 0 0 0 0 0 0 0 7

 Immature females 

0 0 0 0 2,273 7,131 17,220 2,025 37

 Mature females 

0 0 0 0 0 74 363 0 

 Total weight (kg) 

0.00 0.00 0.00 0.00 11.64 1.37 42.70 8.87 1.8

Opilio Tanner Crab Sublegal 

0 0 0 0 70,444 6,834 16,758 545 96

 Legal 

0 0 0 0 7,948 2,303 5,539 2,959 7,34

 Preferred 

0 0 0 0 3,429 1,189 1,917 1,557 4,75

 Immature females 

0 0 0 0 24,702 2,080 5,894 78 

 Mature females 

0 0 0 0 104,263 10,920 52,192 78 37

 Total weight (kg) 

0.00 0.00 0.00 0.00 189.81 27.41 95.09 16.85 41.1

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 6,857 1,189 3,621 78 

 Males 

≥ 78 mm 0 0 0 0 1,714 74 497 78 

 Immature females 

0 0 0 0 0 0 213 0 

 Mature females 

0 0 0 0 1,169 371 4,829 78 14

 Total weight (kg) 

0.00 0.00 0.00 0.00 14.02 1.60 10.55 0.52 0.1

96
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station I-25 I-26 IH1918 IH2019 IH2120 IH2221 J-01 J-02 J-0

Start Date 07/15/2011 07/16/2011 07/01/2011 07/01/2011 07/01/2011 07/01/2011 06/20/2011 06/20/2011 06/16/201Duration (hour) 0.51 0.52 0.50 0.51 0.52 0.54 0.53 0.52 0.5

Distance Fished (km) 2.75 2.89 2.73 2.77 2.84 2.97 2.95 2.80 3.1

Mid-Latitude (oN) 57.67 57.69 57.50 57.50 57.50 57.50 58.00 58.01 58.0

Mid-Longitude (oW) -172.80 -173.40 -168.75 -169.38 -170.00 -170.58 -167.82 -167.17 -166.5

Bottom Depth (m) 118 148 71 69 68 74 66 63 6

Bottom Temperature (oC) 3.1 3.4 3.5 0.7 2.3 2.7 1.0 1.1 1

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 138 0 0 

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 3.03 0.00 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Lega

l 

Immature female

s 

0 0 

0 0 

0 0 

0 0 

0 0 

0 0 

0 0 

0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

77 3,063 7,089 17,480 3,993 2,408 70 223 

 Legal 

0 459 322 542 1,035 206 0 74 

 Preferred 

0 230 161 155 74 69 0 74 

 Immature females 

0 4,365 3,828 16,293 961 895 0 0 

 Mature females 

0 0 0 1,704 370 757 70 0 

 Total weight (kg) 

0.35 4.82 16.40 40.16 22.16 13.05 0.29 1.08 0.0

Opilio Tanner Crab Sublegal 

384 0 5,159 3,795 887 344 4,544 594 18

 Legal 

4,148 4,671 3,412 4,570 14,050 8,395 489 148 37

 Preferred 

3,303 4,212 2,247 1,239 9,317 5,780 280 0 24

 Immature females 

6,298 0 1,082 6,119 0 0 1,258 0 

 Mature females 

158,914 0 31,869 542 148 69 350 148 

 Total weight (kg) 

178.16 38.01 50.17 23.40 82.57 52.09 5.90 1.21 1.7

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 1,831 2,091 0 0 70 0 

 Males 

≥ 78 mm 77 77 416 852 1,109 275 0 0 

 Immature females 

0 77 0 1,084 0 0 70 0 

 Mature females 

77 0 1,664 2,091 0 0 0 0 

 Total weight (kg) 

0.55 0.98 5.11 7.09 6.74 1.61 0.08 0.00 0.0

97
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station J-06 J-07 J-08 J-09 J-10 J-11 J-12 J-13 J-1

Start Date 06/14/2011 06/12/2011 06/12/2011 06/09/2011 06/09/2011 06/08/2011 06/08/2011 06/06/2011 06/06/201Duration (hour) 0.50 0.52 0.53 0.26 0.51 0.26 0.53 0.52 0.5

Distance Fished (km) 2.71 2.85 2.96 1.38 2.75 1.46 2.85 3.02 2.9

Mid-Latitude (oN) 58.00 58.00 58.00 58.01 57.99 57.99 58.00 58.00 58.0

Mid-Longitude (oW) -164.61 -163.99 -163.39 -162.76 -162.10 -161.48 -160.85 -160.23 -159.6

Bottom Depth (m) 44 47 43 40 37 55 45 51 4

Bottom Temperature (oC) 2.0 1.9 2.4 2.7 2.7 2.7 2.8 2.0 3

Red King Crab Immature males 

0 77 230 0 163 757 2198 153 7

 Mature males 

0 384 153 170 245 151 985 76 29

 Legal 

0 384 153 170 245 0 758 76 22

 Immature females 

0 0 0 0 0 454 1667 305 14

 Mature females 

0 384 77 341 735 757 2501 839 52

 Total weight (kg) 

0.00 23.44 9.15 5.86 16.00 13.02 81.80 18.36 16.5

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Opilio Tanner Crab Sublegal 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 0 0 0 0 

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

98
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station J-18 J-19 J-20 J-21 J-22 J-23 J-24 J-25 J-2Start Date 07/02/2011 07/02/2011 07/07/2011 07/06/2011 07/06/2011 07/07/2011 07/15/2011 07/15/2011 07/16/201Duration (hour) 0.51 0.52 0.51 0.55 0.53 0.54 0.50 0.51 0.5

Distance Fished (km) 2.78 2.85 2.76 2.91 2.87 2.93 2.74 2.87 2.8

Mid-Latitude (oN) 57.99 58.00 58.00 58.00 58.01 58.01 58.00 58.00 58.0

Mid-Longitude (oW) -168.43 -169.07 -169.70 -170.34 -170.98 -171.60 -172.24 -172.86 -173.4

Bottom Depth (m) 69 69 70 75 87 97 105 108 11

Bottom Temperature (oC) 1.7 0.6 0.1 1.4 2.4 2.5 2.8 2.9 3

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

930 4,554 29,946 956 1,346 1,887 547 524 54

 Legal 

0 145 304 68 0 202 78 75 7

 Preferred 

0 72 0 68 0 67 0 75 7

 Immature females 

0 1,229 41,683 205 2,490 4,043 312 374 1,47

 Mature females 

0 0 0 0 0 67 0 150 62

 Total weight (kg) 

1.05 6.40 35.06 2.30 2.73 9.32 1.80 1.47 3.8

Opilio Tanner Crab Sublegal 

5,195 6,362 51,982 7,788 1,346 1,685 3,201 1,198 

 Legal 

2,714 2,169 26,714 20,973 7,873 4,582 19,753 4,566 7,38

 Preferred 

1,861 651 3,044 4,167 4,576 2,830 8,979 2,620 6,52

 Immature females 

775 2,386 90,645 273 807 7,615 0 0 

 Mature females 

1,938 1,952 36,532 2,254 1,144 36,725 14,912 39,749 

 Total weight (kg) 

18.50 17.57 178.80 98.36 53.52 74.93 132.06 69.28 58.1

Hybrid Tanner Crab Males 

≤ 77 mm 1,706 2,096 19,332 205 135 202 0 0 

 Males 

≥ 78 mm 310 145 457 205 202 0 0 0 

 Immature females 

0 0 7,459 0 67 337 78 0 

 Mature females 

78 361 18,114 68 202 1,617 0 75 

 Total weight (kg) 

2.64 3.38 28.11 1.26 1.87 2.03 0.01 0.09 0.0

99
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station JI2120 JI2221 K-01 K-02 K-03 K-04 K-05 K-06 K-0

Start Date 07/07/2011 07/06/2011 06/19/2011 06/19/2011 06/17/2011 06/17/2011 06/14/2011 06/14/2011 06/13/201Duration (hour) 0.50 0.55 0.55 0.51 0.53 0.51 0.53 0.50 0.5

Distance Fished (km) 2.75 2.96 3.01 2.79 2.93 2.79 2.92 2.74 2.7

Mid-Latitude (oN) 57.83 57.83 58.34 58.33 58.34 58.33 58.33 58.33 58.3

Mid-Longitude (oW) -169.97 -170.61 -167.84 -167.19 -166.56 -165.92 -165.30 -164.64 -163.9

Bottom Depth (m) 72 78 59 51 48 44 45 44 4

Bottom Temperature (oC) 2.0 2.0 1.6 2.0 2.2 2.2 2.1 2.3 2

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 148 73 0 0 17

 Legal 

0 0 0 0 74 73 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 148 73 0 156 17

 Total weight (kg) 

0.00 0.00 0.00 0.00 6.80 3.91 0.00 1.65 6.9

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

9,498 942 0 0 0 0 74 0 

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

8,415 269 0 0 0 0 0 0 

 Mature females 

330 0 0 0 0 0 0 0 

 Total weight (kg) 

13.88 0.93 0.00 0.00 0.00 0.00 0.01 0.00 0.0

Opilio Tanner Crab Sublegal 

2,143 269 198 0 0 0 0 0 

 Legal 

9,366 1,749 0 79 0 0 0 0 

 Preferred 

2,302 1,009 0 79 0 0 0 0 

 Immature females 

3,810 0 66 0 0 0 0 0 

 Mature females 

6,508 135 0 0 0 0 0 0 

 Total weight (kg) 

43.87 10.31 0.11 0.40 0.00 0.00 0.00 0.00 0.0

Hybrid Tanner Crab Males 

≤ 77 mm 2,460 0 0 0 0 0 0 0 

 Males 

≥ 78 mm 873 0 66 0 0 0 0 0 

 Immature females 

317 0 0 0 0 0 0 0 

 Mature females 

3,095 67 0 0 0 0 0 0 

 Total weight (kg) 

7.47 0.03 0.26 0.00 0.00 0.00 0.00 0.00 0.0

100
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station K-10 K-11 K-12 K-13 K-14 K-18 K-19 K-20 K-2Start Date 06/08/2011 06/08/2011 06/08/2011 06/06/2011 06/06/2011 07/02/2011 07/02/2011 07/06/2011 07/06/201Duration (hour) 0.29 0.26 0.53 0.54 0.52 0.51 0.52 0.51 0.5

Distance Fished (km) 1.47 1.41 2.97 2.93 2.86 2.79 2.89 2.74 2.8

Mid-Latitude (oN) 58.32 58.22 58.32 58.28 58.34 58.32 58.33 58.34 58.3

Mid-Longitude (oW) -162.05 -161.56 -160.78 -159.98 -159.55 -168.46 -169.12 -169.74 -170.3

Bottom Depth (m) 47 41 23 41 26 65 67 69 7

Bottom Temperature (oC) 4.7 4.2 4.9 3.6 5.6 1.2 1.2 1.1 0

Red King Crab Immature males 

149 0 0 370 0 0 0 0 

 Mature males 

0 166 0 74 0 0 0 0 

 Legal 

0 166 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

149 0 0 148 0 0 0 0 

 Total weight (kg) 

0.72 2.32 0.00 6.38 0.00 0.00 0.00 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

0 0 0 0 0 0 145 3,941 5,73

 Legal 

0 0 0 0 0 0 0 149 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 73 3,285 4,97

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 0.00 0.39 3.17 5.7

Opilio Tanner Crab Sublegal 

0 0 0 0 0 377 580 12,475 12,77

 Legal 

0 0 0 0 0 151 435 4,678 8,07

 Preferred 

0 0 0 0 0 75 290 817 2,62

 Immature females 

0 0 0 0 0 75 290 27,624 16,98

 Mature females 

0 0 0 0 0 0 0 3,342 14,35

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 0.88 2.40 37.72 64.0

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 0 0 73 6,535 4,00

 Males 

≥ 78 mm 0 0 0 0 0 0 145 223 13

 Immature females 

0 0 0 0 0 0 0 1,782 3,31

 Mature females 

0 0 0 0 0 0 0 1,559 2,69

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 0.00 0.45 3.89 4.7

101
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station K-24 K-25 K-26 K-27 L-01 L-02 L-03 L-04 L-0Start Date 07/16/2011 07/16/2011 07/16/2011 07/25/2011 06/19/2011 06/19/2011 06/17/2011 06/17/2011 06/14/201Duration (hour) 0.52 0.51 0.52 0.53 0.53 0.52 0.54 0.49 0.5

Distance Fished (km) 2.81 2.79 2.84 2.95 2.92 2.86 2.98 2.62 2.9

Mid-Latitude (oN) 58.34 58.34 58.34 58.33 58.66 58.68 58.67 58.67 58.6

Mid-Longitude (oW) -172.29 -172.93 -173.57 -174.30 -167.88 -167.22 -166.57 -165.93 -165.3

Bottom Depth (m) 102 109 116 159 47 44 43 37 4

Bottom Temperature (oC) 2.2 2.5 2.9 3.3 2.0 2.4 2.4 2.7 2

Red King Crab Immature males 

0 0 0 0 0 77 0 0 

 Mature males 

0 0 0 0 0 77 145 178 

 Legal 

0 0 0 0 0 0 73 89 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 74 0 73 267 7

 Total weight (kg) 

0.00 0.00 0.00 0.00 1.04 1.91 6.40 8.54 1.3

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

1,616 433 295 4,261 0 0 0 0 

 Legal 

808 288 0 0 0 0 0 0 

 Preferred 

0 144 0 0 0 0 0 0 

 Immature females 

808 793 368 5,614 0 0 0 0 

 Mature females 

0 216 0 135 0 0 0 0 

 Total weight (kg) 

7.12 3.44 0.85 4.36 0.00 0.00 0.00 0.00 0.0

Opilio Tanner Crab Sublegal 

9,705 3,245 1,989 0 0 0 0 0 

 Legal 

17,455 5,553 3,903 0 0 0 0 0 

 Preferred 

4,346 3,822 2,430 0 0 0 0 0 

 Immature females 

34,041 2,812 14,288 68 0 0 0 0 

 Mature females 

538,420 64,182 148,848 68 0 0 0 0 

 Total weight (kg) 

543.50 99.09 138.64 0.15 0.00 0.00 0.00 0.00 0.0

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 74 203 0 0 0 0 

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 406 0 0 0 0 

 Mature females 

0 0 74 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 0.30 0.12 0.00 0.00 0.00 0.00 0.0

102
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station L-08 L-09 L-18 L-19 L-20 L-21 L-22 L-23 L-2Start Date 06/13/2011 06/09/2011 07/02/2011 07/02/2011 07/06/2011 07/05/2011 07/08/2011 07/07/2011 07/16/201Duration (hour) 0.49 0.30 0.51 0.53 0.51 0.52 0.50 0.56 0.5

Distance Fished (km) 2.65 1.51 2.84 2.91 2.79 2.71 2.81 3.02 2.7

Mid-Latitude (oN) 58.67 58.66 58.66 58.67 58.67 58.67 58.67 58.67 58.6

Mid-Longitude (oW) -163.36 -162.71 -168.48 -169.15 -169.78 -170.43 -171.07 -171.71 -172.3

Bottom Depth (m) 32 23 53 62 67 73 82 93 10

Bottom Temperature (oC) 3.9 4.0 2.3 1.4 1.2 -0.4 0.7 1.5 1

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 156 0 0 0 0 0 

 Legal 

0 0 156 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 5.85 0.00 0.00 0.00 0.00 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

0 0 0 0 518 2,877 1,079 1,205 15

 Legal 

0 0 0 0 0 0 0 67 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 296 1,893 648 1,138 7

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.73 1.36 0.49 0.97 0.5

Opilio Tanner Crab Sublegal 

0 0 0 355 222 16,809 16,695 5,357 2,78

 Legal 

0 0 0 355 888 3,483 6,189 12,119 8,26

 Preferred 

0 0 0 142 518 227 288 8,638 2,47

 Immature females 

0 0 0 142 1,332 5,452 1,511 803 23

 Mature females 

0 0 0 0 0 6,209 19,645 22,498 3,70

 Total weight (kg) 

0.00 0.00 0.00 1.52 4.41 41.73 64.87 122.45 62.3

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 148 1,136 216 67 

 Males 

≥ 78 mm 0 0 0 0 222 151 0 67 

 Immature females 

0 0 0 0 74 1,060 0 67 

 Mature females 

0 0 0 0 74 530 72 1,071 

 Total weight (kg) 

0.00 0.00 0.00 0.00 1.29 1.40 0.08 1.53 0.0

103
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station L-27 L-28 L-29 L-30 L-31 M-01 M-02 M-03 M-0Start Date 07/25/2011 07/24/2011 07/24/2011 07/23/2011 07/23/2011 06/19/2011 06/19/2011 06/17/2011 06/17/201Duration (hour) 0.55 0.57 0.54 0.55 0.55 0.50 0.50 0.51 0.4

Distance Fished (km) 2.96 3.08 2.96 3.05 3.05 2.77 2.73 2.81 2.6

Mid-Latitude (oN) 58.67 58.72 58.66 58.66 58.66 59.00 59.00 59.00 59.0

Mid-Longitude (oW) -174.28 -174.91 -175.56 -176.22 -176.84 -167.90 -167.23 -166.59 -165.9

Bottom Depth (m) 156 159 135 141 137 42 40 35 3

Bottom Temperature (oC) 3.2 3.2 3.2 3.2 3.1 2.5 2.6 2.9 3

Red King Crab Immature males 

0 0 0 0 0 0 0 163 16

 Mature males 

0 0 0 0 0 0 166 0 

 Legal 

0 0 0 0 0 0 83 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 254 166 81 

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 2.54 4.65 2.86 1.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

21,460 3,533 711 1,137 376 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

21,922 3,347 517 758 188 0 0 0 

 Mature females 

288 62 0 0 0 0 0 0 

 Total weight (kg) 

17.76 1.47 0.68 0.50 0.21 0.00 0.00 0.00 0.0

Opilio Tanner Crab Sublegal 

266 62 0 0 0 0 0 0 

 Legal 

9,505 0 0 0 0 0 0 0 

 Preferred 

7,910 0 0 0 0 0 0 0 

 Immature females 

0 186 0 126 0 0 0 0 

 Mature females 

133 0 0 0 0 0 0 0 

 Total weight (kg) 

88.16 0.04 0.00 0.02 0.00 0.00 0.00 0.00 0.0

Hybrid Tanner Crab Males 

≤ 77 mm 0 186 0 126 0 0 0 0 

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 

 Immature females 

0 124 194 126 0 0 0 0 

 Mature females 

0 0 65 0 0 0 0 0 

 Total weight (kg) 

0.00 0.05 0.07 0.02 0.00 0.00 0.00 0.00 0.0

104
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station M-07 M-08 M-18 M-19 M-20 M-21 M-22 M-23 M-2Start Date 06/13/2011 06/13/2011 07/02/2011 07/03/2011 07/06/2011 07/05/2011 07/08/2011 07/07/2011 07/10/201Duration (hour) 0.53 0.51 0.51 0.51 0.51 0.53 0.51 0.52 0.5

Distance Fished (km) 2.85 2.80 2.82 2.82 2.82 2.93 2.82 2.79 2.7

Mid-Latitude (oN) 59.00 58.99 58.99 59.00 59.00 59.00 59.00 59.00 59.0

Mid-Longitude (oW) -164.02 -163.35 -168.51 -169.18 -169.82 -170.49 -171.11 -171.78 -172.4

Bottom Depth (m) 29 22 47 54 63 71 77 87 9

Bottom Temperature (oC) 3.7 4.6 3.0 2.2 0.9 0.2 -0.8 1.1 1

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 159 0 74 0 0 0 

 Legal 

0 0 79 0 74 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 79 0 74 0 0 0 

 Total weight (kg) 

0.00 0.00 5.96 0.00 4.81 0.00 0.00 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

0 0 79 154 0 952 564 216 7

 Legal 

0 0 0 0 74 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 748 423 288 7

 Mature females 

0 0 0 77 0 0 0 0 

 Total weight (kg) 

0.00 0.00 0.18 0.67 0.38 0.95 0.31 0.82 0.0

Opilio Tanner Crab Sublegal 

0 0 0 0 297 37,191 17,216 13,959 2,07

 Legal 

0 0 79 77 446 3,671 4,445 2,734 1,70

 Preferred 

0 0 79 77 297 408 282 1,151 1,18

 Immature females 

0 0 79 77 149 4,691 1,764 7,267 

 Mature females 

0 0 0 77 74 29,304 23,778 94,837 29,24

 Total weight (kg) 

0.00 0.00 0.46 0.49 2.82 88.88 60.56 111.67 38.8

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 0 1,700 212 144 

 Males 

≥ 78 mm 0 0 0 77 0 204 0 0 

 Immature females 

0 0 0 0 0 1,700 71 1,007 

 Mature females 

0 0 0 0 0 1,564 0 9,426 

 Total weight (kg) 

0.00 0.00 0.00 0.28 0.00 3.75 0.21 8.40 0.0

105
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station M-27 M-28 M-29 M-30 M-31 M-32 N-01 N-02 N-0Start Date 07/25/2011 07/25/2011 07/24/2011 07/24/2011 07/23/2011 07/23/2011 06/19/2011 06/19/2011 06/17/201Duration (hour) 0.52 0.54 0.56 0.56 0.53 0.55 0.51 0.50 0.5

Distance Fished (km) 2.79 3.02 3.03 3.03 3.00 3.02 2.87 2.69 2.9

Mid-Latitude (oN) 59.00 59.00 59.00 59.00 58.99 59.00 59.32 59.34 59.3

Mid-Longitude (oW) -174.37 -174.99 -175.72 -176.30 -176.95 -177.59 -167.92 -167.26 -166.6

Bottom Depth (m) 126 129 133 134 137 135 40 32 2

Bottom Temperature (oC) 2.8 2.9 2.3 2.4 2.7 3.0 2.7 4.1 4

Red King Crab Immature males 

0 0 0 0 0 0 327 0 

 Mature males 

0 0 0 0 0 0 82 169 

 Legal 

0 0 0 0 0 0 0 84 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 163 169 

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 0.00 6.20 6.48 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

448 1,166 5,225 1,668 2,370 4,864 0 0 

 Legal 

75 65 0 0 0 131 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

897 1,425 3,823 834 1,025 6,004 0 0 

 Mature females 

75 194 191 321 0 66 0 0 

 Total weight (kg) 

0.83 2.28 12.54 8.57 4.76 7.50 0.00 0.00 0.0

Opilio Tanner Crab Sublegal 

0 0 64 385 0 197 0 0 

 Legal 

21,975 2,849 127 64 64 0 0 0 

 Preferred 

16,893 2,849 127 64 0 0 0 0 

 Immature females 

0 971 382 513 0 852 0 0 

 Mature females 

224 7,188 0 257 0 0 0 0 

 Total weight (kg) 

144.81 35.55 1.34 1.20 0.21 0.19 0.00 0.00 0.0

Hybrid Tanner Crab Males 

≤ 77 mm 149 0 127 257 0 459 0 0 

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 

 Immature females 

75 0 0 192 0 524 0 0 

 Mature females 

0 194 0 64 0 66 0 0 

 Total weight (kg) 

0.03 0.39 0.03 0.22 0.00 0.24 0.00 0.00 0.0

106
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station N-06 N-07 N-18 N-19 N-20 N-21 N-22 N-23 N-2Start Date 06/13/2011 06/13/2011 07/03/2011 07/03/2011 07/06/2011 07/04/2011 07/08/2011 07/07/2011 07/10/201Duration (hour) 0.54 0.50 0.50 0.52 0.51 0.53 0.52 0.54 0.4

Distance Fished (km) 3.01 2.71 2.75 2.84 2.81 2.96 2.86 2.85 2.6

Mid-Latitude (oN) 59.32 59.32 59.34 59.34 59.34 59.33 59.33 59.34 59.3

Mid-Longitude (oW) -164.67 -164.00 -168.57 -169.22 -169.87 -170.53 -171.18 -171.83 -172.5

Bottom Depth (m) 22 22 42 51 60 68 75 80 8

Bottom Temperature (oC) 4.8 5.4 3.3 2.1 0.7 -0.6 -0.9 -0.5 0

Red King Crab Immature males 

0 0 83 76 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 1.46 0.60 0.00 0.00 0.00 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 70 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.61 0.0

Bairdi Tanner Crab Sublegal 

0 0 0 0 0 0 298 1,047 15

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 893 1,466 7

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 0.00 0.52 1.63 0.2

Opilio Tanner Crab Sublegal 

0 0 0 0 298 28,400 31,869 13,192 3,02

 Legal 

0 0 0 0 0 1,054 1,223 279 1,47

 Preferred 

0 0 0 0 0 0 0 0 77

 Immature females 

0 0 0 0 224 6,721 12,877 26,663 1,62

 Mature females 

0 0 0 0 0 24,513 33,452 30,432 4,65

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.15 59.42 70.87 38.27 14.9

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 165 0 75 264 863 628 7

 Males 

≥ 78 mm 0 0 0 0 149 66 0 0 

 Immature females 

0 0 0 0 0 0 288 1,326 7

 Mature females 

0 0 0 0 0 0 0 1,466 23

 Total weight (kg) 

0.00 0.00 0.26 0.00 0.85 0.44 0.56 2.09 0.3

107
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station N-27 N-28 N-29 N-30 N-31 O-01 O-02 O-03 O-0Start Date 07/17/2011 07/17/2011 07/23/2011 07/23/2011 07/23/2011 06/19/2011 06/19/2011 06/17/2011 06/17/201Duration (hour) 0.50 0.53 0.50 0.51 0.58 0.52 0.52 0.52 0.4

Distance Fished (km) 2.70 2.93 2.75 2.71 3.20 2.84 2.81 3.13 2.6

Mid-Latitude (oN) 59.34 59.33 59.32 59.33 59.33 59.66 59.66 59.66 59.6

Mid-Longitude (oW) -174.44 -175.13 -175.75 -176.38 -177.07 -167.95 -167.28 -166.66 -165.9

Bottom Depth (m) 120 133 136 136 149 35 31 28 2

Bottom Temperature (oC) 2.6 2.3 2.1 2.2 2.6 3.0 4.2 5.3 4

Red King Crab Immature males 

0 0 0 0 0 81 0 0 

 Mature males 

0 0 0 0 0 161 0 0 

 Legal 

0 0 0 0 0 81 0 0 

 Immature females 

0 0 0 0 0 161 0 0 

 Mature females 

0 0 0 0 0 161 81 0 

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 8.34 0.75 0.00 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

77 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

1.14 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0

Bairdi Tanner Crab Sublegal 

845 1,842 3,869 665 1,043 0 0 0 

 Legal 

77 0 287 0 123 0 0 0 

 Preferred 

0 0 0 0 61 0 0 0 

 Immature females 

691 1,559 3,726 665 736 0 0 0 

 Mature females 

77 142 1,075 148 245 0 0 0 

 Total weight (kg) 

1.47 1.64 13.00 0.99 4.08 0.00 0.00 0.00 0.0

Opilio Tanner Crab Sublegal 

845 142 645 295 1,105 0 0 0 

 Legal 

17,197 1,559 143 0 61 0 0 0 

 Preferred 

4,453 1,134 72 0 61 0 0 0 

 Immature females 

461 1,063 502 443 2,086 0 0 0 

 Mature females 

230 3,330 860 74 184 0 0 0 

 Total weight (kg) 

76.67 14.09 2.67 0.25 1.28 0.00 0.00 0.00 0.0

Hybrid Tanner Crab Males 

≤ 77 mm 154 213 645 148 123 0 0 0 

 Males 

≥ 78 mm 0 0 143 0 61 0 0 0 

 Immature females 

0 283 215 0 123 0 0 0 

 Mature females 

0 0 3,367 222 61 0 0 0 

 Total weight (kg) 

0.02 1.45 8.90 0.68 0.28 0.00 0.00 0.00 0.0

108
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station O-20 O-21 O-22 O-23 O-24 O-25 O-26 O-27 O-2Start Date 07/05/2011 07/04/2011 07/08/2011 07/08/2011 07/10/2011 07/10/2011 07/10/2011 07/17/2011 07/17/201Duration (hour) 0.52 0.52 0.52 0.54 0.49 0.51 0.51 0.50 0.5

Distance Fished (km) 2.77 2.82 2.87 2.96 2.67 2.77 2.81 2.75 2.8

Mid-Latitude (oN) 59.68 59.67 59.67 59.67 59.67 59.67 59.66 59.66 59.6

Mid-Longitude (oW) -169.93 -170.58 -171.24 -171.90 -172.56 -173.25 -173.87 -174.45 -175.1

Bottom Depth (m) 56 67 72 77 84 94 104 114 12

Bottom Temperature (oC) 1.0 0.2 -1.1 -0.2 0.8 0.9 2.1 2.4 2

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 150 0 

 Mature males 

0 0 0 0 0 867 1,353 147 

 Legal 

0 0 0 0 0 433 977 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 17.32 9.52 2.23 0.0

Bairdi Tanner Crab Sublegal 

0 71 0 473 0 826 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 224 0 0 472 0 73 7

 Mature females 

0 0 0 0 0 0 0 0 53

 Total weight (kg) 

0.00 0.05 0.05 0.15 0.00 0.85 0.00 0.11 1.4

Opilio Tanner Crab Sublegal 

227 10,536 13,649 3,243 313 21,093 526 3,080 18,22

 Legal 

0 212 144 135 156 1,517 23,376 5,939 28,63

 Preferred 

0 0 0 0 0 289 12,477 1,540 9,72

 Immature females 

0 7,708 6,106 4,324 78 10,402 75 14,151 388,92

 Mature females 

0 7,425 43,391 22,498 0 23,983 827 52,279 224,13

 Total weight (kg) 

0.26 23.98 49.70 30.08 0.76 40.52 130.69 86.87 509.2

Hybrid Tanner Crab Males 

≤ 77 mm 151 0 216 68 0 2,456 0 0 

 Males 

≥ 78 mm 0 0 0 0 0 0 451 0 

 Immature females 

0 0 0 473 0 144 0 0 

 Mature females 

0 0 144 1,419 0 1,517 0 73 15

 Total weight (kg) 

0.08 0.00 0.15 1.28 0.00 2.33 2.38 0.10 0.2

109
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station O-31 ON2524 ON2625 P-01 P-18 P-19 P-20 P-21 P-2Start Date 07/22/2011 07/10/2011 07/10/2011 07/03/2011 07/03/2011 07/03/2011 07/03/2011 07/04/2011 07/08/201Duration (hour) 0.54 0.52 0.52 0.52 0.50 0.53 0.52 0.53 0.5

Distance Fished (km) 2.93 2.83 2.86 2.85 2.77 2.85 2.87 2.86 2.9

Mid-Latitude (oN) 59.67 59.50 59.50 60.01 59.99 60.00 60.01 60.00 60.0

Mid-Longitude (oW) -177.16 -172.85 -173.49 -168.00 -168.65 -169.33 -169.97 -170.63 -171.3

Bottom Depth (m) 172 93 102 26 39 46 55 65 6

Bottom Temperature (oC) 3.0 0.8 1.5 5.0 3.6 2.5 0.7 -0.3 -1

Red King Crab Immature males 

0 0 0 0 86 75 0 0 

 Mature males 

0 0 0 0 86 75 145 0 

 Legal 

0 0 0 0 86 75 73 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 86 0 0 0 

 Total weight (kg) 

0.00 0.00 0.00 0.00 5.13 2.69 3.38 0.00 0.0

Blue King Crab Immature males 

0 73 143 0 0 0 0 0 

 Mature males 

0 581 1,362 0 0 0 0 0 

 Legal 

0 363 1,004 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 13.25 32.63 0.00 0.00 0.00 0.00 0.00 0.0

Bairdi Tanner Crab Sublegal 

0 0 215 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

401 0 215 0 0 0 0 0 

 Mature females 

201 0 0 0 0 0 0 0 

 Total weight (kg) 

0.87 0.00 0.37 0.00 0.00 0.00 0.00 0.00 0.0

Opilio Tanner Crab Sublegal 

0 1,452 18,712 0 0 151 218 3,186 9,50

 Legal 

602 798 3,441 0 0 0 0 139 6

 Preferred 

602 290 1,004 0 0 0 0 0 

 Immature females 

468 73 13,335 0 0 75 580 208 7,64

 Mature females 

67 363 93,130 0 0 0 0 1,177 34,08

 Total weight (kg) 

5.69 6.19 126.82 0.00 0.00 0.03 0.32 4.48 41.7

Hybrid Tanner Crab Males 

≤ 77 mm 134 0 0 0 0 0 0 0 62

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 

 Immature females 

0 0 932 0 0 0 0 0 82

 Mature females 

0 0 7,313 0 0 0 0 0 1,72

 Total weight (kg) 

0.02 0.00 7.32 0.00 0.00 0.00 0.00 0.00 2.0

110
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station P-25 P-26 P-27 P-28 P-29 P-30 P-31 P-32 PO242

Start Date 07/09/2011 07/10/2011 07/17/2011 07/17/2011 07/22/2011 07/23/2011 07/22/2011 07/22/2011 07/09/201Duration (hour) 0.35 0.53 0.51 0.52 0.51 0.49 0.55 0.53 0.5

Distance Fished (km) 1.93 2.96 2.84 2.82 2.84 2.66 3.03 2.91 2.8

Mid-Latitude (oN) 60.00 59.99 60.00 60.00 60.01 60.00 60.01 60.00 59.8

Mid-Longitude (oW) -173.26 -173.95 -174.59 -175.26 -175.93 -176.72 -177.20 -177.90 -172.2

Bottom Depth (m) 75 97 107 116 129 141 137 141 7

Bottom Temperature (oC) 0.2 1.4 1.8 1.7 2.3 1.7 1.6 2.4 -0

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Blue King Crab Immature males 

214 0 0 0 0 0 0 0 

 Mature males 

107 809 708 0 0 0 0 0 

 Legal 

107 607 283 0 0 0 0 0 

 Immature females 

214 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

2.89 18.16 14.00 0.00 0.00 0.00 0.00 0.00 0.0

Bairdi Tanner Crab Sublegal 

0 0 0 228 422 820 389 212 14

 Legal 

0 0 0 152 211 146 0 71 

 Preferred 

0 0 0 0 70 146 0 0 

 Immature females 

214 0 71 76 221 0 194 0 

 Mature females 

0 0 0 0 221 1,054 65 0 

 Total weight (kg) 

0.07 0.00 0.10 1.69 5.26 5.77 1.14 1.53 0.1

Opilio Tanner Crab Sublegal 

5,347 19,748 13,036 28,479 23,852 8,423 907 71 13,96

 Legal 

107 2,763 1,488 11,193 5,277 12,158 5,962 1,199 28

 Preferred 

0 539 0 914 1,407 5,493 4,536 987 

 Immature females 

13,260 1,550 12,327 53,454 127,842 127,000 2,203 282 2,68

 Mature females 

749 8,830 87,637 290,649 108,916 601,088 5,573 1,269 18,69

 Total weight (kg) 

4.15 48.94 100.46 316.79 215.13 679.68 57.39 21.19 29.9

Hybrid Tanner Crab Males 

≤ 77 mm 1,176 876 0 0 0 0 0 0 7

 Males 

≥ 78 mm 0 202 0 0 0 0 0 71 

 Immature females 

428 404 0 0 0 0 0 0 7

 Mature females 

428 1,078 71 0 1,337 1,025 0 0 7

 Total weight (kg) 

0.66 2.76 0.09 0.00 1.75 1.51 0.00 0.53 0.1

111
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station PO2726 Q-01 Q-02 Q-18 Q-19 Q-20 Q-21 Q-22 Q-2Start Date 07/10/2011 07/04/2011 07/03/2011 07/04/2011 07/04/2011 07/04/2011 07/04/2011 07/08/2011 07/08/201Duration (hour) 0.62 0.51 0.52 0.51 0.52 0.51 0.50 0.52 0.5

Distance Fished (km) 3.46 2.82 2.88 2.77 2.86 2.80 2.75 2.88 2.9

Mid-Latitude (oN) 59.84 60.33 60.34 60.33 60.33 60.33 60.33 60.34 60.3

Mid-Longitude (oW) -174.25 -167.96 -167.26 -168.66 -169.30 -169.99 -170.66 -171.36 -172.0

Bottom Depth (m) 106 32 33 36 43 51 62 66 5

Bottom Temperature (oC) 1.9 5.9 6.5 4.0 3.1 1.2 -0.5 -0.6 -0

Red King Crab Immature males 

0 0 0 0 0 77 0 0 

 Mature males 

0 0 0 82 151 0 74 0 

 Legal 

0 0 0 82 75 0 74 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 82 0 77 0 0 

 Total weight (kg) 

0.00 0.00 0.00 4.17 3.29 2.48 2.67 0.00 0.0

Blue King Crab Immature males 

58 0 0 0 0 0 0 0 36

 Mature males 

760 0 0 0 0 0 0 0 29

 Legal 

584 0 0 0 0 0 0 0 7

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 7

 Total weight (kg) 

21.92 0.00 0.00 0.00 0.00 0.00 0.00 0.00 7.3

Bairdi Tanner Crab Sublegal 

58 0 0 0 0 0 0 0 7

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

58 0 0 0 0 0 0 0 

 Mature females 

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 0.1

Opilio Tanner Crab Sublegal 

5,901 0 0 0 151 56,787 29,644 34,265 15,86

 Legal 

2,921 0 0 0 0 0 0 0 7

 Preferred 

1,753 0 0 0 0 0 0 0 

 Immature females 

467 0 0 0 75 25,042 5,424 21,977 36

 Mature females 

993 0 0 0 0 10,248 21,397 43,954 58

 Total weight (kg) 

33.97 0.00 0.00 0.00 0.04 49.35 46.17 79.72 17.8

Hybrid Tanner Crab Males 

≤ 77 mm 467 0 0 0 0 771 0 913 14

 Males 

≥ 78 mm 175 0 0 0 0 0 0 0 

 Immature females 

292 0 0 0 0 385 0 1,896 7

 Mature females 

467 0 0 0 0 0 0 2,598 14

 Total weight (kg) 

3.08 0.00 0.00 0.00 0.00 0.94 0.00 4.03 0.3

112
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station Q-27 Q-28 Q-29 Q-30 Q-31 QP2423 QP2524 QP2625 QP272

Start Date 07/17/2011 07/17/2011 07/22/2011 07/22/2011 07/22/2011 07/09/2011 07/09/2011 07/09/2011 07/09/201Duration (hour) 0.51 0.53 0.50 0.50 0.58 0.51 0.55 0.51 0.5

Distance Fished (km) 2.82 2.92 2.67 2.69 3.22 2.80 2.99 2.80 2.8

Mid-Latitude (oN) 60.33 60.34 60.32 60.33 60.33 60.16 60.18 60.13 60.1

Mid-Longitude (oW) -174.70 -175.38 -176.04 -176.74 -177.40 -172.33 -173.02 -173.77 -174.3

Bottom Depth (m) 100 110 122 137 146 57 59 88 10

Bottom Temperature (oC) 1.1 1.6 1.6 1.6 2.0 1.3 0.0 0.5 1

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Blue King Crab Immature males 

0 0 0 0 0 375 1,331 74 

 Mature males 

0 0 0 0 0 675 560 0 44

 Legal 

0 0 0 0 0 225 350 0 14

 Immature females 

0 0 0 0 0 0 700 0 

 Mature females 

0 0 0 0 0 75 70 0 

 Total weight (kg) 

0.00 0.00 0.00 0.00 0.00 16.88 21.56 0.70 7.5

Bairdi Tanner Crab Sublegal 

0 435 0 223 0 75 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

72 1,016 332 0 0 75 0 74 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.07 1.14 0.32 0.16 0.00 0.15 0.00 0.05 0.0

Opilio Tanner Crab Sublegal 

16,642 51,885 39,395 13,237 2,009 40,743 420 14,027 8,87

 Legal 

1,441 3,991 9,340 9,816 24,355 75 0 148 2,93

 Preferred 

72 943 603 3,272 7,306 75 0 74 1,39

 Immature females 

43,513 53,191 115,624 2,900 15,526 26,562 490 9,893 7,03

 Mature females 

79,174 395,780 245,184 75,553 22,467 300 70 21,927 16,20

 Total weight (kg) 

107.97 261.72 336.26 138.05 180.37 9.54 0.21 34.20 41.2

Hybrid Tanner Crab Males 

≤ 77 mm 72 1,742 301 0 0 675 0 2,732 95

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 365 675 0 2,732 2,78

 Mature females 

144 2,903 979 223 548 75 0 3,175 2,71

 Total weight (kg) 

0.23 1.00 1.68 0.29 1.28 0.39 0.00 2.86 4.7

113
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station R-24 R-25 R-26 R-27 R-28 R-29 R-30 R-31 R-3Start Date 07/20/2011 07/18/2011 07/18/2011 07/21/2011 07/17/2011 07/22/2011 07/22/2011 07/21/2011 07/21/201Duration (hour) 0.51 0.51 0.50 0.50 0.50 0.50 0.51 0.54 0.5

Distance Fished (km) 2.81 2.70 2.73 2.77 2.83 2.75 2.75 2.92 3.0

Mid-Latitude (oN) 60.67 60.67 60.68 60.66 60.68 60.67 60.67 60.66 60.6

Mid-Longitude (oW) -172.75 -173.47 -174.13 -174.81 -175.45 -176.19 -176.80 -177.51 -178.1

Bottom Depth (m) 45 66 86 97 107 118 129 146 16

Bottom Temperature (oC) 1.6 -0.4 0.6 0.9 1.3 1.3 1.5 1.9 2

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Blue King Crab Immature males 

3,528 157 76 0 0 0 0 0 

 Mature males 

9,127 78 76 73 0 0 0 0 

 Legal 

3,988 78 0 73 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

77 0 0 0 0 0 0 0 

 Total weight (kg) 

186.29 2.73 1.90 2.02 0.00 0.00 0.00 0.00 0.0

Bairdi Tanner Crab Sublegal 

77 0 0 0 0 441 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.20 0.00 0.00 0.00 0.00 0.10 0.00 0.00 0.0

Opilio Tanner Crab Sublegal 

6,673 627 45,478 17,340 47,803 61,076 351,826 90,702 

 Legal 

0 0 76 294 2,405 7,727 35,656 22,951 6,22

 Preferred 

0 0 0 0 150 1,337 7,131 2,068 5,31

 Immature females 

3,451 392 37,470 19,691 2,555 226,696 0 2,412 88,01

 Mature females 

6,749 313 28,480 44,599 17,964 340,007 9,969 46,109 200,00

 Total weight (kg) 

12.00 0.58 81.72 63.29 93.41 462.61 595.61 260.50 279.4

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 76 73 0 0 0 0 

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 0.04 0.03 0.00 0.00 0.00 0.00 0.0

114
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station S-24 S-25 S-26 S-27 S-28 S-29 S-30 S-31 T-2

Start Date 07/18/2011 07/18/2011 07/21/2011 07/21/2011 07/21/2011 07/21/2011 07/21/2011 07/21/2011 07/18/201Duration (hour) 0.49 0.50 0.50 0.51 0.49 0.49 0.53 0.40 0.5

Distance Fished (km) 2.66 2.71 2.77 2.78 2.67 2.69 2.87 2.23 2.8

Mid-Latitude (oN) 61.00 61.00 61.00 60.99 61.00 61.00 61.01 61.00 61.3

Mid-Longitude (oW) -172.83 -173.50 -174.19 -174.87 -175.54 -176.30 -176.98 -177.62 -173.5

Bottom Depth (m) 66 75 83 92 102 112 121 134 7

Bottom Temperature (oC) -1.2 -0.3 0.3 0.7 1.1 1.1 1.1 1.5 -1

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Opilio Tanner Crab Sublegal 

26,704 27,764 46,693 31,615 62,238 126,432 123,142 92,368 75,26

 Legal 

0 0 450 0 533 4,661 36,685 5,934 

 Preferred 

0 0 0 0 0 74 2,646 974 

 Immature females 

26,633 26,485 52,689 19,101 17,348 117,184 90,676 12,753 79,79

 Mature females 

11,939 12,791 23,684 31,469 34,695 119,477 267,379 60,929 33,46

 Total weight (kg) 

36.11 42.59 78.98 64.40 103.86 314.64 541.04 140.08 102.2

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 73 0 0 0 0 

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 73 0 444 0 0 

 Mature females 

0 0 0 0 0 0 0 0 

 Total weight (kg) 

0.00 0.00 0.00 0.08 0.00 0.17 0.00 0.00 0.0

115
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station T-28 T-29 T-30 U-25 U-26 U-27 U-28 U-29 V-2Start Date 07/18/2011 07/20/2011 07/21/2011 07/19/2011 07/19/2011 07/19/2011 07/20/2011 07/20/2011 07/19/201Duration (hour) 0.54 0.52 0.56 0.51 0.54 0.52 0.54 0.52 0.5

Distance Fished (km) 3.01 2.86 3.12 2.85 2.98 2.89 2.95 2.88 2.9

Mid-Latitude (oN) 61.33 61.34 61.34 61.67 61.66 61.68 61.66 61.67 62.0

Mid-Longitude (oW) -175.66 -176.30 -176.97 -173.66 -174.43 -175.07 -175.79 -176.46 -173.7

Bottom Depth (m) 97 106 116 70 77 87 96 105 6

Bottom Temperature (oC) 0.9 1.0 1.1 -1.3 -0.1 0.4 0.6 0.8 -1

Red King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Blue King Crab Immature males 

0 0 0 0 0 0 0 0 

 Mature males 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Bairdi Tanner Crab Sublegal 

0 0 0 0 0 0 0 0 

 Legal 

0 0 0 0 0 0 0 0 

 Preferred 

0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

Opilio Tanner Crab Sublegal 

150,382 103,402 154,669 107,620 58,590 93,522 213,873 96,062 134,24

 Legal 

1,395 0 6,719 0 0 0 0 0 

 Preferred 

0 0 3,393 0 0 0 0 0 

 Immature females 

180,273 77,430 191,325 109,749 58,590 106,814 247,531 95,460 156,15

 Mature females 

52,873 45,295 198,177 25,840 8,268 9,339 11,516 50,238 21,83

 Total weight (kg) 

256.90 145.75 627.68 113.23 66.36 92.06 243.12 156.78 123.1

Hybrid Tanner Crab Males 

≤ 77 mm 0 0 0 0 0 0 0 0 

 Males 

≥ 78 mm 0 0 0 0 0 0 0 0 

 Immature females 

0 0 0 0 0 0 0 0 

 Mature females 

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 0.0

116
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station V-28 Z-05 C-09 D-10 E-11 E-12 F-11 F-12 F-1

Start Date 07/20/2011 06/24/2011 07/31/2011 07/31/2011 07/30/2011 07/30/2011 07/29/2011 07/29/2011 07/30/201Duration (hour) 0.29 0.51 0.51 0.51 0.53 0.51 0.51 0.51 0.5

Distance Fished (km) 1.62 2.81 2.77 2.74 2.93 2.85 2.88 2.80 2.8

Mid-Latitude (oN) 62.00 54.68 55.68 56.00 56.33 56.33 56.66 56.67 56.6

Mid-Longitude (oW) -175.83 -165.15 -162.81 -162.25 -161.63 -161.00 -161.58 -160.99 -160.3

Bottom Depth (m) 92 82 53 72 63 53 89 67 6

Bottom Temperature (oC) 0.6 5.3 7.3 6.8 6.7 7.7 4.2 5.8 6

Red King Crab Immature males 

0 0 0 77 973 0 446 2,111 22

 Mature males 

0 0 0 154 674 0 1,784 829 7

 Legal 

0 0 0 154 374 0 1,605 679 

 Immature females 

0 0 0 0 299 0 0 1,659 7

 Mature females 

0 0 0 2,151 13,399 0 1,338 7,164 2,13

 Total weight (kg) 

0.00 0.00 0.00 50.75 279.25 0.00 76.34 140.72 46.6

Blue King Crab Immature males 

0 0

 Mature males 

0 0

 Legal 

0 0

 Immature females 

0 0

 Mature females 

0 0

 Total weight (kg) 

0.00 0.00 

Bairdi Tanner Crab Sublegal 

0 73

 Legal 

0 0

 Preferred 

0 0

 Immature females 

0 73

 Mature females 

0 0

 Total weight (kg) 

0.00 0.29 

Opilio Tanner Crab Sublegal 

43,531 0

 Legal 

0 0

 Preferred 

0 0

 Immature females 

57,846 0

 Mature females 

5,163 0

 Total weight (kg) 

63.50 0.00 

Hybrid Tanner Crab Males 

≤ 77 mm 0 0

 Males 

≥ 78 mm 0 0

 Immature females 

0 0

 Mature females 

0 0

 Total weight (kg) 

0.00 0.00 

117
Appendix. Tow details, crab density (number/nmi2), and catch weight at successful stations on the 2011 eastern Bering Sea bottom trawl sur

Station G-13 G-14 H-11 H-12 H-13 H-14 I-12 I-13 I-1

Start Date 07/30/2011 07/27/2011 07/29/2011 07/28/2011 07/28/2011 07/26/2011 07/28/2011 07/28/2011 07/26/201Duration (hour) 0.52 0.51 0.49 0.52 0.51 0.50 0.51 0.51 0.5

Distance Fished (km) 2.85 2.73 2.74 2.94 2.75 2.63 2.79 2.80 2.8

Mid-Latitude (oN) 56.99 57.00 57.33 57.33 57.33 57.34 57.67 57.66 57.6

Mid-Longitude (oW) -160.34 -159.69 -161.54 -160.93 -160.29 -159.66 -160.89 -160.27 -159.6

Bottom Depth (m) 65 54 57 62 62 55 56 56 4

Bottom Temperature (oC) 5.8 6.9 4.4 5.1 6.2 6.9 5.2 6.0 6

Red King Crab Immature males 

79 0 6,579 290 2,663 82 399 0 

 Mature males 

79 158 1,434 145 161 82 877 313 15

 Legal 

79 158 675 145 161 82 558 313 15

 Immature females 

0 0 2,109 0 2,663 0 80 78 7

 Mature females 

2,989 2,295 5,060 2,395 3,470 821 2,950 4,073 1,40

 Total weight (kg) 

59.63 49.40 170.13 47.33 83.50 17.04 76.97 80.74 33.2

118
RECENT TECHNICAL MEMORANDUMS
 

Copies of this and other NOAA Technical Memorandums are available from the 

National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22167 

(web site: www.ntis.gov). Paper and electronic (.pdf) copies vary in price. 

AFSC234	 ALLEN, B. M., and R. P. ANGLISS. 2012. Alaska marine mammal stock assessments, 2011, 288 p. 

NTIS number pending. 

233	 KONDZELA, C. M., W. T. McCRANEY, H. T. NGUYEN, and J. R. GUYON. 2012. Genetic stock 

composition analysis of chum salmon bycatch samples from the 2010 Bering Sea groundfish fisheries, 

29 p. NTIS No. PB2012-107442. 

232	 GUTHRIE, C. M. III, H. T. NGUYEN, and J. R. GUYON. 2012. Genetic stock composition analysis of 

chinook salmon bycatch samples from the 2010 Bering Sea trawl fisheries, 22 p. NTIS No. PB2012­

104700. 

231	 SMITH, K. R., R. A. MCCONNAUGHEY, and C. E. ARMISTEAD. 2011. Benthic invertebrates of the 

Eastern Bering Sea: A synopsis of the life history and ecology of snails of the genus Neptunea., 58 p. 

NTIS No. PB2012-108929. 

230	 HIMES-CORNELL, A., C. PACKAGE, and A. DURLAND. 2011. Improving community profiles for the 

North Pacific fisheries, 85 p. NTIS No. PB2012-108928. 

229	 YANG, M-S. 2011. Diet of nineteen mesopelagic fishes in the Gulf of Alaska, 67 p. NTIS No. PB2012­

PB2012-102005. 

228	 LEW, D. K., and A. HIMES-CORNELL. 2011. A guide to designing, testing, and implementing Alaska 

Fisheries Science Center economic and social surveys, 43 p. NTIS No. PB2012100169. 

227	 LAUTH, R. R. 2011. Results of the 2010 eastern and northern Bering Sea continental shelf bottom 

trawl survey of groundfish and invertebrate fauna, 256 p. NTIS No. PB2012100168. 

226	 TESTA, J. W. (editor). 2011. Fur seal investigations, 2008-2009, 80 p. NTIS No. PB2012100205. 

225	 RARING, N. W., P. G. VON SZALAY, F. R. SHAW, M. E. WILKINS, and M. H. MARTIN. 2011. Data 

Report: 2001 Gulf of Alaska bottom trawl survey, 179 p. NTIS No. PB2011-111406. 

224	 HOFF, G. R., and L. L. BRITT. 2011. Results of the 2010 eastern Bering Sea upper continental slope 

survey of groundfish and invertebrate resources, 300 p. NTIS No. PB2011-111407. 

223	 ALLEN, B. M., and R. P. ANGLISS. 2011. Alaska marine mammal stock assessments, 2010, 292 p. 

NTIS No. PB2011-111461. 

222	 GRAY, A. K.,W. T. MCCRANEY, C. T. MARVIN, C. M. KONDZELA, H. T. NGUYEN, and J. R. 

GUYON. 2011. Genetic stock composition analysis of chum salmon bycatch samples from the 2008 

Bering Sea groundfish fisheries, 29 p. NTIS No. PB2011-110765. 

221	 GRAY, A. K.,W. T. MCCRANEY, C. T. MARVIN, C. M. KONDZELA, H. T. NGUYEN, and J. R. 

GUYON. 2011. Genetic stock composition analysis of chum salmon bycatch samples from the 2007 

Bering Sea groundfish fisheries, 29 p. NTIS No. PB2011-110764. 

220	 MARVIN, C. T., S. L. WILDES, C. M. KONDZELA, H. T. NGUYEN, and J. R. GUYON. 2011. Genetic 

stock composition analysis of chum salmon bycatch samples from the 2006 Bering Sea groundfish 

fisheries, 29 p. NTIS No. PB2011-108416. 

219	 JONES, D. T., A. De ROBERTIS, and N. J. WILLIAMSON. 2011. Statistical combination of 

multifrequency sounder-detected bottom lines reduces bottom integrations, 13 p. NTIS No. 

PB2011-108416.