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<br />TABLE OF CONTENTS <br /> <br />~ <br />LIST OF TABLES v <br />LIST OF FIGURES Vll <br />UST OF APPENDICES xi <br />ACKNOWLEDGEMENTS xii <br /> <br />EXECUTIVE SUMMARY xiii <br /> <br />INTRODUCTION 1 <br />STUDY GOAL AND OBJECTIVES 1 <br />STUDY AREA 2 <br /> <br />METHODS 2 <br />Fish population sampling 2 <br />Radio transmitter implantation and tracking 9 <br /> <br />RESULTS 10 <br />Y AMPA RIVER FLOW AND TEMPERATURE REGIME 10 <br />NORTHERN PIKE 13 <br />Length frequency distributions 16 <br />Length-weight relationship 17 <br />Average lengths, condition factors and relative weight indices 'B <br />Food habits, fish prey composition and fish prey size 32 <br />Vulnerability of fish to northern pike predation 4l <br />Movements 54 <br />Growth of recaptured northern pike (J) <br />Spavnring n <br />CHANNEL CATFISH 76 <br />Length frequency distributions 76 <br />Length-weight relationship 84 <br />Average lengths, condition factors and relative weight indices &5 <br />Food habits 92 <br />Vulnerability of fish to channel catfish predation CJ1 <br />Spavnring 98 <br />Y AMPA RIVER FISHES HABITAT ASSOCIATIONS 107 <br />Habitat use by radiotagged northern pike 107 <br />Northern pike/Colorado squawfish interactions from radiotracking data 109 <br />Fish species associations in backwater habitats 110 <br />Effects of removal of northern pike and channel catfish from backwaters 117 <br /> <br />iii <br />