9315

• UCREFRP Catalog Number: 9315
• Author: Harvey, M. D. and R. A. Mussetter.
• Title: Evaluation of the Required Frequency of Bar Forming Events and 2-Dimensional Hydrodynamic Modeling at Colorado Squawfish Spawning Sites in the Lower Yampa Canyon, Colorado.
• USFW Year: 1996.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

F
Research Component - SDCR
Task No. - 1
No: Part of No. 1
(for MC ";Sep
RECOVERY IMPLEMENTATION PROGRAM FOR THE ENDANGERED
FISH SPECIES IN THE UPPER COLORADO RIVER BASIN
FY-1992
SCOPE-OF-WORK
RESEARCH PROPOSAL
Lead Agency: U.S. Bureau of Reclamation/ Category:
Larval Fish Laboratory XOngoing project
-Requested new
Submitted by: Kevin R. Bestgen, Robert T. Muth start
Unsolicited
Address: Larval Fish Laboratory (LFL) Project
Department of Fishery and -Outside funding
Wildlife Biology
Colorado State University
Fort Collins, CO 80523
Phone: [phone]; FAX [phone]
Date: May 1991
1. Title of Proposal:
ANNUAL ASSESSMENT OF COLORADO SQUAWFISH REPRODUCTION AND LARVAL ABUNDANCE
IN THE LOWER YAMPA RIVER, COLORADO, AND THE LOWER GREEN RIVER, UTAH.
II. Relation to Recovery Program/Ranking Factors:
This study was started in 1990 and is part of the "Five-Year Flaming Gorge
Flow Recommendations Investigations (FGFRI)"; specifically Element 1
(Reproduction) of the Systematic Data Collection and Research (SDCR)
program. The SDCR, which was outlined in detail in the FY-1991 FGFRI
proposal, is composed of four interrelated elements and is intended to
directly assess effects of seasonal operation of Flaming Gorge Dam on
annual reproduction and long-term recruitment of fishes in the Green River
system. The four elements include 1) reproduction, 2) age-0 survival to
fall (age-0 recruitment), 3) over-winter survival of young fish (age-1
recruitment), and 4) link between recruitment of young fish and
recruitment to adult stocks. Integrated studies under FGFRI (i.e., SDCR
studies and hypotheses-testing studies; which are intended to aid in
interpretation of SDCR results by addressing specific questions) will
facilitate determination of factors affecting annual reproduction,
abundance, and recruitment of Colorado squawfish (and other fishes) in the
Green River basin.
Annual assessment of Colorado squawfish reproduction and larval abundance
(this study) is necessary to identify and assess factors affecting annual
recruitment, and is directly linked with SDCR Elements 2 and 3 (see
description of SDCR Tasks 2, 3, and 4). Interpretation of results of this
study will be enhanced by information from hypotheses-testing studies 3 --
"Availability, habitat characteristics, and fish use of spring habitats
for Colorado squawfish and razorback sucker in the Green river) and
especially 5 (hypotheses-testing Task 5 -- "Integration of field and
laboratory studies on aspects of early life biology and development of
selected fishes in the Green River system); see specific proposals.
C1