8105

• UCREFRP Catalog Number: 8105
• Author: Haines, G. B., D. W. Beyers and T. Modde.
• Title: Estimation of Winter Survival, Movement and Dispersal of Young Colorado Squawfish in the Green River, Utah.
• USFW Year: 1998.
• USFW - Doc Type: Recovery Program Project 36,
• Copyright Material: NO

Table of Contents

List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

List of Figures ............................................................... vi

List of Key Words ........................................................... viii

Executive Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

Introduction .................................................................. 1

Study Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Methods ..................................................................... 5

Capture-recapture Population Estimates ...................................... 5
Fish capture and marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Parameter estimates ................................................ 5

Comparison ofCPUE and Capture-Recapture Estimates .........................6

Movement ............................................................. 7

Factors that Influence Overwinter Survival . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Results ..................................................................... 10

Movement ........................................................... 10

Population and Survival Estimates ......................................... 12
Fish capture and marking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Population estimates .............................................. 18

Overwinter survival ............................................... 20

Comparison ofCPUE and Capture-Recapture Estimates ........................21
Factors that Influence Overwinter Survival. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Size. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Discussion .................................................................. 28

Movement ............................................................ 28

Capture-Recapture Population Estimates ....................................30

iii