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 140 (continued)

Chemically
fingerprinting
nonnative fishes in
reservoirs (project
C18/19)

Yampa River pike
sources (Project 143)

Study Goal and Objectives

Objectives
1. Select treatment and reference areas for study.
2. Implement removal of smallmouth bass and northern pike in treatment reaches in spring
(mostly conducted in a different study).
3. Assess abundance of predators in treatment and reference reaches to determine removal effects.
4. Conduct additional removals prior to summer if removals were not sufficient or if the removal
effect was transitory.
5. Estimate response of native fishes in autumn after spring-summer predator removal.
Goal
To determine chemical "fingerprints" of nonnative fishes in reservoirs that are potential sources
of nonnative fishes to critical habitat.
Objectives
1. Quantify chemical "fingerprints" of fishes within study reservoirs and evaluate degree of inter-
annual variation in those fingerprints.
2. Determine if fish sampled in rivers the vicinity of study reservoir possess otoliths core
signatures that identify them as having originated from one of the study reservoirs.
3. Improve our understanding of the degree to which immigration or transfers from reservoirs
contributes to the load of nonnative fishes in critical habitat of the Upper Colorado River Basin.
4. Provide recommendations to guide management efforts to reduce the influx of nonnative fishes
from reservoirs.
Goal 1.
Map degree of movement of pike within the Yampa River system via otoliths microchemistry.
Objectives 1.
1. Demonstrate differences in chemical signatures of otoliths of age-O pike from various sources.
2. Evaluate how quickly differences can be detected via laser ablation.
3. Estimate the proportion of pike recruited from reservoirs and other spawning areas in the
Yampa River.
4. Estimate the extent of pike movement from spawning sources and reservoirs to other habitats
within the Yampa River system.
Goal 2.
Evaluate trophic relationships of pike within Stagecoach Reservoir, Lake Catamount, Elkhead
Reservoir, and portions ofthe Yampa River using stable isotope analysis.

Status

Ongoing

Ongoing

FY

2006 -
2009

2005 -
2006

~
~
~
~
::ti
V:l
"-3
8
~

~

:>
I
......
o

~
~
$;!
~

-'"
'"
c
C
'-l