8159

• UCREFRP Catalog Number: 8159
• Author: Trammell, M. and T. Chart.
• Title: Aspinall Studies
• USFW Year: 1999.
• USFW - Doc Type: Annual Assessment of Colorado Pikeminnow Larval Production in the Colorado River, Utah 1992-1996 \
• Copyright Material: NO

TABLE OF CONTENTS
TABLE OF CONTENTS ..................................................... ii
LIST OF TABLES ...........................................................iii
LIST OF FIGURES ...........................................................v
ACKNOWLEDGMENTS .................................................... vii
EXECUTIVE SUMMARY ...................................................viii
LIST OF KEY WORDS ..................................................... viii
INTRODUCTION ............................................................1
METHODS ..................................................................1
RESULTS ...................................................................3
Species composition and relative abundance .................................. 3
Annual Colorado pikeminnow drift abundance ............................... 4
Relationship of flow and temperature variables to spawning .................... 8
Relationship of flow and temperature variables to abundance of drifting larvae .... 10
Relationship of larval abundance to fall year class strength .................... 12
DISCUSSION ...............................................................15
Comparison of drift results from Loma, Westwater and Moab .................. 15
Drift and back water density ofnon-native cyprinids .......................... 17
The role of flows in Colorado pikeminnow reproductive success ................. 20
CONCLUSIONS ............................................................20
RECOMMENDATIONS ...................................................... 23
BIBLIOGRAPHY ...........................................................24
APPENDICES ..............................................................48
Appendix A ...........................................................49
Formulae used to estimate catch per unit effort ......................... 49
Age-Length formulae .............................................49
Appendix B ...........................................................50
Appendix C ...........................................................51
Evaluation of the link between adult population and larval drift abundance ... 51
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