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<br />TABLE OF CONTENTS <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />FRONTISPIECE ...................................................... ii <br />PREFACE ...........................................................iii <br />LIST OF TABLES and LIST OF FIGURES ................................. iv <br />EXECUTIVE SUMMARY ............................................... v <br />PART 1. INTRODUCTION .............................................. 1 <br />PART 2. ENDANGERED FISHES IN THE UPPER COLORADO RIVER BASIN .... 2 <br />Background ................................................... 2 <br />Present Distribution and Abundance ............................... 4 <br />Colorado pikeminnow ...................................... 5 <br />Humpback chub .......................................... 6 <br />Razorback sucker ......................................... 7 <br />Bonytail ................................................. 7 <br />Life History Requirements ....................................... 8 <br />Colorado pikeminnow ..................................... 10 <br />Adult, nonspawning ................................. 10 <br />Migration and Spawning ............................. 12 <br />Larvae and Postiarvae ............................... 15 <br />Juveniles .......................................... 17 <br />Integration of Life History ............................ 17 <br />Razorback Sucker ........................................ 19 <br />Integration of Life History ............................ 21 <br />Humpback Chub ......................................... 22 <br />Bonytail ................................................ 23 <br />PART 3. ENVIRONMENTAL FACTORS LIMITING RECOVERY ............... 23 <br />General ...................................................... 23 <br />Basin wide Limiting Factors ..................................... 24 <br />Abiotic ................................................. 24 <br />Biotic .................................................. 26 <br />Species~pecific Limiting Factors ................................ 28 <br />Colorado pikeminnow ..................................... 28 <br />Adult nonspawning habitat ........................... 28 <br />Adult migration and spawning habitat .................. 30 <br />Adult population size ................................ 30 <br />Larvae and Postiarvae ............................... 31 <br />Juveniles .......................................... 32 <br />Razorback sucker ........................................ 33 <br />ix <br /> <br />