9549

• UCREFRP Catalog Number: 9549
• Author: Bestgen, K. R., K. A. Zelasko, R. I. Compton and T. Chart.
• Title: Response of the Green River Fish Community to Changes in Flow Temperature Regimes from Flaming Gorge Dam since 1996 based on sampling conducted from 2002 to 2004.
• USFW Year: 2006.
• USFW - Doc Type: 115,
• Copyright Material: NO

TABLE OF CONTENTS
EXECUTIVE SUMMARY .........................................................iv
LIST OF TABLES ..............................................................ix
LIST OF FIGURES ...............................................................x
KEY WORDS ................................................................ xiv
INTRODUCTION ................................................................1
STUDY AREA .................................................................6
METHODS ....................................................................8
Collection ofsmall-bodied fish ............................................. 8
Collection of large-bodied fish ............................................. 9
Stream flow and water temperature data collection and presentation .............. 11
Fish sample data analysis and presentation ................................... 11
RESULTS AND DISCUSSION ......................................................14
Effects of Flaming Gorge Dam on Green River discharge and temperature patterns,
Lodore Canyon ...................................................14
Effects of Flaming Gorge Dam on Green River discharge and temperature patterns,
Whirlpool Canyon .................................................17
Composition of the fish community in Browns Park, Lodore Canyon, Whirlpool Canyon,
and Island-Rainbow Park reaches 2002-2004 .......................... 19
Comparison offish community composition across the longitudinal gradient in Browns
Park, Lodore and Whirlpool canyons, and Island-Rainbow Park between the
1994 to 1996 and 2002 to 2004 periods, seine samples ................... 23
Spatial and temporal patterns of distribution, abundance, and size-structure of selected
species, comparison of 1994 to 1996 and 2002 to 2004 periods . ............ 26
Nativefishes . ....................................................27
Non-nativefishes ..................................................31
Effects ofseason, year, and turbidity on capture success, electrofishing samples ..... 37
Effects of reach, season, and year, on fish density, 2002 to 2004 seine samples ...... 40
Trammel net sampling ................................................... 45
Drift net sampling ......................................................47
Species accounts .......................................................49
Colorado pikeminnow .............................................49
Roundtail chub ...................................................51
Humpback chub ..................................................53
Bonytail ........................................................55
Razorback sucker .................................................57
Non-native predators .............................................. 57
Composition and reproductive status of the fish community of the Green River upstream
of the Yampa River, 1962-2004 ...................................... 60
11