9705

• UCREFRP Catalog Number: 9705
• Author: Green River Study Plan ad hoc Committee.
• Title: Study plan for the implementation and evaluation of flow and temperature recommendations for endangered fishes in the Green River downstream of Flaming Gorge Dam.
• USFW Year: 2007.
• USFW - Doc Type: Upper Colorado River Endangered Fish Recovery Program
• Copyright Material: NO

Table AI. Continued.
Studies
Project 124 (continued)

Evaluation of
smallmouth bass and
northern pike
management in Middle
Yampa River (Project
125)

Yampa native fish
response to nonnative
fish management
(Project 140)

Study Goal and Ob.iectives

Obiectives .
1. Reduce the abundance of adult smallmouth bass, channel catfish, and northern pike in the
Duchesne River reach between the Myton Diversion (RM 41) and the confluence of the Green
River.
2. Maintain public support for the Recovery Program by providing angling opportunity to the
Ute Tribes' Elders Pond with nonnative fish removed from the Duchesne River.
3. Monitor fish composition in the lower Duchesne River.
4. Evaluate the physical habitat characteristics of riffles and compare to historic data.
Goal
The goal is to remove as many smallmouth bass as possible from a 24-mile treatment reach
and a 5-mile concentration reach and estimate the proportion of the population removed from
each reach.
Obiectives
Smallmouth Bass:
1. Obtain an estimate of the number of smallmouth bass in a 24-mile treatment reach in Little
Yampa Canyon and a 5-mile reach in Lily Park using a mark-recapture abundance estimator.
2. Remove a large portion of the estimated population of small mouth bass.from the 24-mile
treatment reach in Little Yampa Canyon and the 5-mile concentration area in Lily Park.
3. Calculate the proportion of smallmouth bass removed from each study area based on initial
population size and compare capture rates between control and treatment reaches.
4. Remove large numbers of age-O and age-l smallmouth bass from a l2-mile treatment reach
in Little Yampa Canyon.
5. Understand movement of recaptured smallmouth bass tagged in previous years or during the
first (tagging) pass each year.
Northern Pike:
1. Obtain an estimate of the number of northern pike that reside in the 95-mile study reach in
the Yampa River using a mark-recapture abundance estimator. (This will be done by Project
98a).
2. Remove a large portion of the estimated population of northern pike from the smallmouth
bass study reaches and from other reaches opportunistically as needed to support Project 98a.
3. Calculate the proportion of northern pike removed based on initial population size.
Goal
The goal is to reliably estimate the response of resident native fishes to a known, relatively
large, and well-estimated level of predator removal.

Status

Ongoing

Ongoing

FY

2003 - 2007
(synthesis
report)

2004 - 2007
(synthesis
report)

Q
~
~
~
~
~
~
~
~
~

:>
I
\0

~
c:r<
....
I::
l::l
~
.~
~
<::::>
<::::>
'I