Slide 1

Monitoring of Great
Basin Redband Trout
6 Year Pilot Study

ODFW
Native Fish Investigations Project


Slide 2

Motives


To address data gaps outlined in the Native Fish Status
Review (ODFW 2005).



To provide better management for future fishing
opportunities.



To write effective conservation plans for all Great Basin
SMUs.



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


Slide 3

Objective
To design and test a sample strategy capable of
assessing status and trends of redband trout at the
SMU and population scales.


Slide 4

Project Scope
Malheur Lakes
Fort Rock

Malheur Lakes
Fort Rock

Chewaucan

Warner Lakes

Catlow Valley

Goose Lake

Chewaucan

SMUs = Six interior
basins of the Great
Basin

Warner Lakes
Catlow Valley

Goose Lake


Slide 5

Project Scope
Malheur Lakes
Fort Rock

Malheur Lakes
Fort Rock
Chewaucan

Warner Lakes

Catlow Valley

Goose Lake

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

Chewaucan

Warner Lakes

Goose Lake

Catlow Valley


Slide 6

Methods
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

Select sample sites
throughout the potential
distribution of redband
trout using EMAP protocol.
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30 sites in each SMU every
year.
30 sites in each of 8
populations. Each
population sampled every 3
years.

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Slide 7

Land Ownership of Great Basin
Redband Trout Habitat
Legend
Redband Trout Populations Land Ownership
Land Ownseship
BLM
ODF
PVT
USFS
USFWS
0

20

40

80 Kilometers

Malheur Lakes
Fort Rock

Chewaucan

Warner Lakes

Catlow Valley

Goose Lake


Slide 8

Methods


Conduct 2-pass removal density estimates at each site
using electrofishing techniques.



Calibrate removal estimates by also conducting markrecapture estimates at a portion of sites.



Collect stream habitat data at each site


Slide 9

Analysis


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

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
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Abundance
Distribution
Size-age composition
Degree of uncertainty
Time series trends
Fish-habitat relationships
Effects of climate variation


Slide 10

Annual Budget
USFWS – SFR
ODFW
Miscellaneous

$164,700
$20,000
$10,000

Total

$194,700