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 128 (continued)

Population estimation of
humpback chub in
Desolation and Gray
Canyon (Project 129)

Evaluation ofYampa
River humpback chub
population (project
133)

Middle Green River
northern pike control
(project 109)

Study Goal and Ob.iectives
e) Green River from downstream of Green River, Utah, to the confluence with the Colorado
River.
The LFL and CDOW will attempt up to six sampling passes in the Yampa River, in part
associated with bass and northern pike removal projects, in order to obtain a more precise and
accurate Colorado pikeminnow abundance estimate.
2. Obtain highest possible rates of capture of Colorado pikeminnow within concentration
habitats and maximize number of individuals marked and captured on each sampling occasion.
3. Obtain estimates of probability of capture and abundance for Colorado pikeminnow in each
of five reaches and for entire study area.
Goal
To estimate the population size of humpback chub in Desolation/ Gray Canyon with
confidence intervals of less than 20%.
Objectives
1) To obtain a population estimate of late juvenile/adult humpback chub in Desolation/Gray
Canyon.
2) To detennine mean estimated recruitment of naturally produced subadult humpback chub
(150-199 mm) in Desolation/Gray Canyon.
Goal
The goal of this study is defme the distribution, length frequency and size of the Yampa
humpback chub population, and determine the relative rate of recruitment.
Objectives
1. Detennine the geographical distribution of the Yampa humpback chub population.
2. Determine the number of adults and subadults in the Yampa humpback chub population.
3. Determine and length frequency and relative numbers of juveniles in the Yampa humpback
chub population.
Goal
The goal of northern pike control in the middle Green River is to sufficiently reduce the
abundance of adults such that predatory and competitive impacts on growth, recruitment, and
survival of endangered and other native fishes are minimized.
Objectives
1. Capture and remove (lethal) adult northern pike from reaches of the middle Green River.
2. Maintain low occurrence of adult northern pike in the middle Green River.
3. Determine the efficiency of removal efforts.
4. Identify the means and levels of northern pike control necessary to minimize the threat of
predation/competition on endangered and other native fishes.

Status FY ~
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Ongoing, 2001 - TBD
periodic

Ongoing,
periodic

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1998 - TBD

Ongoing

2001 - 2007
(synthesis
report)

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