Monitoring of Great Monitoring of Great Basin Redband TroutBasin Redband Trout

6 Year Pilot Study6 Year Pilot Study

ODFWODFWNative Fish Investigations ProjectNative Fish Investigations Project

MotivesMotives To address data gaps outlined in the Native Fish Status To address data gaps outlined in the Native Fish Status

Review (ODFW 2005).Review (ODFW 2005).

To assess the response of fish populations to changes in To assess the response of fish populations to changes in climatic conditions. climatic conditions.

To provide better management for future fishing To provide better management for future fishing opportunities.opportunities.

To write effective conservation plans for all Great Basin To write effective conservation plans for all Great Basin SMUs.SMUs.

ObjectiveObjectiveTo design and test a sample strategy capable of To design and test a sample strategy capable of assessing status and trends of redband trout at the assessing status and trends of redband trout at the SMUSMU and and populationpopulation scales. scales.

Project ScopeProject Scope

SMUsSMUs = Six interior = Six interior basins of the Great basins of the Great BasinBasin

Fort RockMalheur Lakes

Catlow Valley

Warner Lakes

Chewaucan

Goose Lake

Fort RockMalheur Lakes

Catlow ValleyWarner Lakes

Chewaucan

Goose Lake

Project ScopeProject Scope

Fort Rock

Malheur Lakes

Catlow ValleyWarner Lakes

Chewaucan

Goose Lake

Fort RockMalheur Lakes

Catlow ValleyWarner Lakes

Chewaucan

Goose Lake

PopulationsPopulations = groups of = groups of fish potentially able to fish potentially able to reproduce in the same reproduce in the same place and same time.place and same time.

MethodsMethods

Select sample sites Select sample sites throughout the potential throughout the potential distribution of redband distribution of redband trout using EMAP protocol.trout using EMAP protocol.

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30 sites in each of 8 30 sites in each of 8 populations. Each population populations. Each population sampled every 3 years.sampled every 3 years.

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30 sites in each SMU every 30 sites in each SMU every year.year.

Land Ownership of Great Basin Land Ownership of Great Basin Redband Trout HabitatRedband Trout Habitat

Fort Rock

Malheur Lakes

Catlow Valley

Warner Lakes

Chewaucan

Goose Lake

Legend

Redband Trout Populations Land Ownership

Land Ownseship

BLM

ODF

PVT

USFS

USFWS

0 40 8020 Kilometers

MethodsMethods Conduct 2-pass removal density estimates at each site Conduct 2-pass removal density estimates at each site

using electrofishing techniques.using electrofishing techniques.

Calibrate removal estimates by also conducting mark-Calibrate removal estimates by also conducting mark-recapture estimates at a portion of sites.recapture estimates at a portion of sites.

Collect stream habitat data at each site Collect stream habitat data at each site

AnalysisAnalysis

Generate estimates of redband trout parameters at SMU Generate estimates of redband trout parameters at SMU and populations scales using EMAP statistical and populations scales using EMAP statistical algorithms.algorithms.

AbundanceAbundance DistributionDistribution Size-age compositionSize-age composition Degree of uncertaintyDegree of uncertainty Time series trendsTime series trends Fish-habitat relationshipsFish-habitat relationships Effects of climate variationEffects of climate variation

Annual BudgetAnnual Budget

USFWS – SFRUSFWS – SFR $164,700$164,700

ODFWODFW $20,000 $20,000

MiscellaneousMiscellaneous $10,000 $10,000

TotalTotal $194,700$194,700