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<br />TABLE OF CONTENTS <br /> <br />ACKNOWLEDGEMENTS <br /> <br />. .. ....... .... .. ..... ..... . . . ... ., .. .. <br /> <br />LIST OF TABLES ........................................... vi <br /> <br />LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii <br /> <br />LIST OF APPENDICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii <br /> <br />PURPOSE ................................................ 1 <br /> <br />INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., I <br /> <br />BACKGROUND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3 <br />THE COLORADO RlVER BASIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3 <br />COLORADO RlVER 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 ............... II <br /> <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 /> <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 /> <br />STATUS ......................................... 28 <br />HABITAT REQUIREMENTS ............................ 28 <br />Spawning Habitat ................................. 28 <br />Nursery Habitat .................................. 29 <br />Juvenile and Adult Habitat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 <br /> <br />11 <br />