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<br />. <br /> <br />. <br /> <br />TABLE OF CONTENTS <br /> <br />INTRODUCTION AND BACKGROUND............................................... 1 <br />BIOLOGICAL OPINION........................................................ 2 <br />DESCRIPTION OF FLAMING GORGE OPERATION.................................... 3 <br /> <br />BACKGROUND. . . .. . .. . .. . .. .. . .. . .. .. . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 3 <br />OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 <br />BASIS FOR OPINION......................................................... 7 <br />DEVELOPMENT AND EXTENT OF PERTINENT SCIENTIFIC DATA BASE........... 7 <br />GREEN AND VAMPA RIVER COMPlEX...................................... 9 <br /> <br />ENDANGERED FISHES.................................................. 10 <br />COLORADO SQUAWFISH................................................. 10 <br /> <br />General Status................................................. 10 <br />Adults......................................................... 11 <br />Mi grat ion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 12 <br />Spawning....................................................... 13 <br />larvae and Postlarvae.......................................... 15 <br /> <br />Juven i 1 es . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 17 <br />HUMPBACK CHUB...................................................... 18 <br />Genera 1 Status................................................. 18 <br />Adul ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 18 <br />Spawni ng. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 19 <br />larval and Juvenile............................................ 20 <br />BONVTAIl CHUB...................................................... 20 <br />Status and Distribution.................,...................... 20 <br /> <br />Adul ts. . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 20 <br />Spawning....................................................... 20 <br />larval and Juvenile............................................ 21 <br /> <br />RAZORBACK SUCKER................................................... 21 <br />General Status................................................. 21 <br />Adul ts..............................,............. ........ ..... 21 <br />Mi grat ion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 22 <br />Spawni ng. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 22 <br />larval and Juvenile............................................ 23 <br />EFFECTS OF THE ACTION..................................................... 23 <br />ENVIRONMENTAL BASELINE............................................. 24 <br />CUMULATIVE EFFECTS................................................. 25 <br /> <br />iii <br />