7333

• UCREFRP Catalog Number: 7333
• Author: Valdez, R. A. and W. J. Masslich.
• Title: Winter Habitat Study of Endangered Fish - Green River, Wintertime Movement and Habitat of Adult Colorado Squawfish and Razorback Suckers.
• USFW Year: 1989.
• USFW - Doc Type: Report No. 136-2 for Bureau of Reclamation,
• Copyright Material: NO

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TABLE OF CONTENTS

1.0 INTRODUCTION .................................................. 1

2.0 STUDY AREA . . . . . . . . . . _. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 1

3.0 METHODOLOGY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 5

3.1 Capturing The Fish .................................................. 5
3.2 Implanting The Radiotransmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 6

3.3 Radiotracking ...................................................... 7

3.4 Monitoring Fish Movement And Habitat Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 9

3.5 Hydrologic Data . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11

4.0 THE RIVER HYDROLOGY .......................................... 12

5.0 WINTER RIVERINE CONDITIONS.................................... 17
5.2 Year 1: The Winter of 1986-87 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 17
5.3 Year 2: The Winter Of 1987-88 .......................................... 20

6.0 RESULTS AND DISCUSSION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 29

6.1 Movement......................................................... 29

6.2 Habitat Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 33

6.3 Effect Of Flow Fluctuations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 36
6.4 Other Observations .................................................. 41

7.0 CONCLUSIONS.................................................... 43

UTERATURE CITED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 45

APPENDIX A: BIO/WEST Database of Winter Radiotelemetry .... . . . . . . . . . . . . . . . .. 48
A-1: Summary of Radiotagged Fish
A-2: Printout of Raw Data
A-3: Documentation for BIO/WEST Database

APPENDIX B: Fish Movement Maps 84

APPENDIX C: Documentation For Habitat Mapping . . . . . . . . . . . . . . . . . . . . . . . . . .. 97
C-1 : Habitat Maps
C-2: Habitat Definitions

APPENDIX D: IFIM Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

APPENDIX E: Observations of Radiotagged Northern Pike . . . . . . . . . . . . . . . . . . . . . . . 163

APPENDIX F: Performance of Radiotelemetry Equipment

169

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