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TABLE OF CONTENTS <br />ACKNOWLEDGEMENTS ...................................... i <br />LIST OF TABLES ........................................... vi <br />LIST OF FIGURES ........................................... vii <br />LIST OF APPENDICES ........................................ viii <br />PURPOSE ................................................ 1 <br />INTRODUCTION ............................................ 1 <br />BACKGROUND ............................................. 3 <br />THE COLORADO RIVER BASIN ............................... 3 <br />COLORADO RIVER FLOODPLAIN ............................. 7 <br />LIFE HISTORIES OF COLORADO RIVER ENDANGERED FISHES ........ 8 <br />RAZORBACK SUCKER .................................. 8 <br />HISTORIC DISTRIBUTION AND ABUNDANCE ............... 9 <br />CURRENT DISTRIBUTION AND ABUNDANCE ............... 11 <br />STATUS .................................. ......11 <br />HABITAT REQUIREMENTS ............................ 12 <br />Spawning Habitat ................................. 12 <br />Nursery Habitat .................................. 13 <br />Juvenile and Adult Habitat ............................ 13 <br />MOVEMENT/MIGRATION ............................. 15 <br />COLORADO SQUAWFISH ................................16 <br />HISTORIC DISTRIBUTION AND ABUNDANCE ............... 16 <br />CURRENT DISTRIBUTION AND ABUNDANCE ............... 18 <br />STATUS .........................................20 <br />HABITAT REQUIREMENTS ............................ 20 <br />Spawning Habitat ................................. 20 <br />Nursery Habitat ................................... 22 <br />Juvenile and Adult Habitat ............................ 23 <br />MOVEMENT/MIGRATION ............................. 23 <br />HUMPBACK CHUB .....................................24 <br />HISTORIC DISTRIBUTION AND ABUNDANCE ............... 24 <br />CURRENT DISTRIBUTION AND ABUNDANCE ............... 26 <br />STATUS .........................................28 <br />HABITAT REQUIREMENTS ............................ 28 <br />Spawning Habitat ................................. 28 <br />Nursery Habitat .................................. 29 <br />Juvenile and Adult Habitat ............................ 29 <br />ii