7400

• UCREFRP Catalog Number: 7400
• Author: Valdez, R. A.
• Title: The Endangered Fish of Cataract Canyon
• USFW Year: 1990.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

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TABLE OF CONTENTS
(Continued)

4.4 Fish Collections by Gear with CPE Statist.ics ............................... 38

4.4.1 Electrofishing ................................................ 38

4.4.2 Gill and Trammel Nets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 40

4.4.3 Seines ..................................................... 40

4.4.4 Drift Nets ................................................... 41

4.5 Species Associations by Habitat ....................................... 41
4.5.1 Habitats Used by Rare Fish .............................."........ 41
4.5.2 Sympatric Associations with Rare Fish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 43

5.0 DISCUSSION ........................................................ 47

5.1 Biology of the Rare Fish ............................................. 47

5.1.1 Colorado Squawfish . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . .. 47

5.1.2 Humpback Chub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 56

5.1.3 Bonytail .................................................... 66

5.1.4 Razorback Sucker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .. 68

5.2 Findings of Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 68

5.2.1 Objective 1: Spawning Locations of Endangered Fish ................... 68
5.2.2 Objective 2: Humpback Chub Population in Cataract . . . . . . . . . . . . . . . . . . .. 71
5.2.3 Objective 3: Nursery Habitat in the Lake Powell Inflow ................... 72

6.0 RECOMMENDATIONS.................................................. 76

6.1 Recommended Changes to the Sensitive Areas Document ... . . . . . . . . . . . . . . . . .. 76

6.1.1 Colorado Squawfish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 76

6.1.2 Humpback Chub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 82

6.1.3 Razorback Sucker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 85

6.2 General Recommendations ........................................... 85

6.2.1 Confirm Spawning by Humpback Chub . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., 85
6.2.2 Overwinter Survival of YOY Colorado Squawfish ........................ 86
6.2.3 Assess Transport of Endangered Fish during Spring Runoff . . . . . . . . . . . . . . .. 86
6.2.4 Monitor Adult Humpback Chub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 86
6.2.5 Describe the Gila Complex in Cataract Canyon . . . . . . . . . . . . . . . . . . . . . . . .. 87
6.3 Recommendations for Future Study ..................................... 87

UTERATURE CITED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 89

UST OF APPENDICES

APPENDIX A - PHOTOGRAPHIC RECORD
APPENDIX B - SPECIES DESCRIPTIONS
APPENDIX C - STANDARD FIELD DATA SHEET
APPENDIX D - SUMMARY OF FISH SAMPUNG EFFORTS
APPENDIX E - SUMMARY OF NUMBERS AND PERCENTAGES OF FISH CAPTURED
BY YEAR AND REGION
APPENDIX F - CATCH PER EFFORT STATISTICS
APPENDIX G - DATA ASSOCIATED WITH ALL ENDANGERED FISH CAPTURED
APPENDIX H - SEQUENTIAL UST OF FISH TAGS

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