8177

• UCREFRP Catalog Number: 8177
• Author: Valdez, R. A., B. R. Cowdell and L. Lentsch.
• Title: Overwinter Survival of Age-0 Colorado Pikeminnow in the Green River, Utah, 1987-1995\
• USFW Year: 1999.
• Copyright Material: NO

TABLE OF CONTENTS

LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11

LIST OF FIGURES ........................................................... 11

ACKNOWLEDGMENTS...................................................... iii

EXECUTIVE SUMMARY ..................................................... iv

INTRODUCTION ............................................................. 1

Background ............................................................ 1

Hypotheses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

STUDY AREA ............................................................... 3

METHODS .................................................................. 3

Hydrology and Temperature ............................................... 3

Age-O Survival . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Catch-Per-Unit-Effort .................................................... 5

RESULTS ................ ..' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Hydrology and Temperature ............................................... 6

Age-O Survival . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Backwater Depth ....................................................... 13

Sympatric Fishes ....................................................... 14

DISCUSSION ............................................................... 18

Evaluation of Hypotheses ................................................ 18
Reliability of Catch Rate Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Early Runoff Spike Flows ................................................ 2q

('ONCLUSIONS ............................................................. 20

RECOMMENDATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

LITERATURE CITED ........................................................ 21