U.S. Department of the Interior

U.S. Geological Survey

Long-Term Experimental and 

Management Plan (LTEMP) Biological 

Opinion Conservation Measures update: 

Technical Work Group Meeting

January 25, 2018

Scott VanderKooi

Southwest Biological Science Center

Grand Canyon Monitoring and 

Research Center

Katrina Grantz

Bureau of Reclamation

Upper Colorado Region
TRIGGER 2015 2016 2017

1A. Combined adult Humpback Chub 

(HBC) mainstem Little Colorado River 

(LCR) aggregation and juvenile HBC in 

LCR

≤ 9000 > 9,0001 > 9,0001 ND*

OR

1B. Recruitment of sub-adult HBC does 

not equal or exceed estimated adult 

mortality

Sub-adult in spring estimates ≤ 1,250 for 3 years 9212 7492 3,1462

OR

Sub-adult in mainstem in Juvenile Chub 

Monitoring (JCM) Reach ≤ 810 for 3 years ND* ND* ND*

Incidental Take Parameters and 

Action Triggers:

TIER 1 – Early Intervention

1 USGS, preliminary data, do not cite

2 USFWS, preliminary data, do not cite * Not determined, results forthcoming
TRIGGER 2015 2016 2017

HBC decline to <7,000 N/A N/A N/A

Terminate mechanical removal Predator index is 60 

rainbow trout (RBT)/km - - -

Immigration rate - - -

OR

HBC population estimates Exceeds 7,500 - - -

Survival rates of sub-adult chub Exceeds adult mortality 

for at least 2 years - - -

Incidental Take Parameters and 

Action Triggers:

TIER 2 – Mechanical Removal

- - - -~ -
Conservation Measures

Consevation Measure 

Humpback Chub 

Trans locations 

Mainstem 

LCR M onitoring 

Mainstem monitorin 

Refuge 

Razorback Sucker 

Activity that addresses it 

NPS-Humpback Chub Tributary Translocations 

Mainstem tributaries (Shinumo, and Associated Monitoring and Nonnative Fish 

Havasu Upper Havasu) Control; GCMRC- Pro·ect C 

Chute falls GCMRC - Pro"ect G 

Explore other tribs 

Nonnative removal in tribs 

LCR 

Mainstem augmentation 

Spring and Fall Population 

e,timates 

LCR mainstem aggregation 

monitorin 

New populations & outside 

agregations 

Parasite monitoring 

Fund FWS Humpback Chub 

refuge (SNARRC) 

Habitat use 

Det ermine effect s of dam 

operations-TMFs 

Determine extent of 

GCMRC- Project G; NPS - Humpback Chub 

Tributary Translocations and Associat ed 

Monitoring and Nonnative Fish Control; FWS -

coordination with Havasupai Tribe on 

trans locations 

NPS-Humpback Chub Tributary Translocations 

and Associated Monitoring and Nonnative Fish 

Control 

GCMRC Project G 

GCMRC Project G 

GCMRC Project G 

GCMRC Project G 

GCMRC Project G 

GCMRC Pro·ect G 

GCMRC Project G; NPS/BioWest/FWS 

GCMRC Project I 

Reclamation 

GCMRC-Proj ect F; NPS/BioWest-Razorback 

Sucker Monitoring and Adaptive Management, 

Larval and Small-bodied Fish Sampling 

GCMRC- Project H; NPS-Razorback Sucker 

Monit oring and Adaptive Management, Larval 

and Small-bodied Fish Sampling 

work 

NPS/GCMRC 

GCMRC/FWS 

GCMRC/NPS/FWS 

NPS/GCMRC 

GCMRC/FWS 

GCMRC/FWS 

GCMRC/FWS 

GCMRC/FWS 

GCMRC 

GCMRC/NPS/FWS 

GCMRC/NPS/BioWest/ 

FWS 

GCMRC 

FWS / Reclamation 

GCMRC/NPS/ BioWest 

NPS/GCMRC 

-~ -
Conservation Measures

Consevation Measure 

Benefit Native Aquatic Species 

Activity that addresses it 

GCMRC- Project F ; NPS-Humpback Chub 

Remove brown trout from Bright Tribut ary Translocations and Associ ated 

Angel, inflow & and othe r a reas Monitoring and Nonnative Fish Control 

Eva luate use of pisci cide or 

other tools to renovat e Bright 

Ange l and Shinumo 

Eva luate TMFs for brown trout 

Ra pid Res ponse 

Eva luate t emperat ure control 

methods 

Eva luate means to prevent fish 

passage t hroug h the dam 

GCMRC-Project H 

GCMRC- Project I; NPS-lnvasive Speci es 

Monitoring & Management 

Reclamation Project C.9 

Reclamation Project C.8 

NPS- Invasive Species Monitoring and 

work 

GCMRC/NPS 

NPS 

GCMRC 

NPS/GCMRC 

Recl amation 

Recl amation 

-~ -