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' ~ ~.~~-~ <br />*' <br />TABLE OF CONTENTS <br />INTRODUCTION AND BACKGROUND 1 <br />BIOLOGICAL OPINION ; ; ; ; ; ; ; ; ; ; ; ; <br />~ <br />• <br />• ~ ~ ~ 3 <br />~ <br />DESCRIPTION OF FLAMING <br />GORGE <br />OPERATION 4 <br />BACKGROUND <br />. 4 <br />OPERATION r <br />~ ~ 4 <br />BASIS FOR OPINION <br />• <br />• <br />' S <br />DEVELOPMENT AND EXTENT <br />OF PERTINENT SCIENTIFIC <br />DATA BASE <br />~ <br />~ 7 <br />GREEN AND YAMPA RIVER COMPLEX <br />~ ~ <br />~ ~ g <br />ENDANGERED FISH <br />~ ~ ~ ~ ~ ~ 9 <br />COLORADO SQUAWFISH <br />~ <br />~ ~ ~ ~ ~ 10 <br />General Status 10 <br />Adults 10 <br />Migration <br /> <br />Spawning ; <br />• 12 <br /> <br />Larvae and <br />Postlarvae ~ <br />~ ~ ~ ~ 12 <br />~ 14 <br />Juven i 1 es <br />~ ~ ~ ~ ~ ~ ~ ~ ~ 16 <br />HUMPBACK CHUB <br />.............. <br />~ ~ ~ ~ 16 <br />General Status 16 <br />Adults 16 <br />Spawning <br />~ 17 <br />Larval and~Juvenile <br />~ lg <br />BONYTAIL CHUB <br />• <br />~ ~ ~ ~ 18 <br />Status and <br />Distribution <br />~ ~ ~ lg <br />Adults 18 <br />Spawning <br />' <br />~ 19 <br />Larval and <br />Juvenile <br />~ <br />~ ~ lg <br />RAZORBACK SUCKER <br />~ ~ ~ ~ 19 <br />General Status <br />~ ~ ~ lg <br />Adults 20 <br />Migration 20 <br />Spawning <br />• <br />~ ~ ~ ~ 20 <br />Larval and <br />Juvenile <br />~ ~ 21 <br />EFFECTS OF THE ACTION ; ; ; <br />• ~ ~ ~ ~ 22 <br />ENVIRONMENTAL BASELINE <br />~ ~ ~ <br />~ ~ ~ ~ 2g <br />CUMULATIVE EFFECTS <br />• <br />• ; 24 <br />CONSIDERATIONS IN DEVELOPING <br />A <br />REASONABLE AND PRUDENT ALTERNATIVE ~ ~ 24 <br />Spring <br />~ ~ 25 <br />Colorado squawf i sh <br />~ ~ ~ ~ 25 <br />Humpback chub <br />~ ~ ~ ~ ~ 26 <br />Razorback sucker <br />~ ~ <br />~ ~ ~ ~ ~ ~ 26 <br />Bonytai 1 chub . -: <br />~ ~ 26 <br />Sinner <br />Colorado squawfi sh • ~ ~ ~ ~ ~ ~ . <br />26 <br />Humpback chub ~ ~ ~ ~ <br />• <br />~ ~ ~ ~ 26 <br />27 <br />Bonytail chub <br />~ ~ ~ 27 <br />Razorback sucker ; ; ; ; ; ; ; ; ; ; ; ; 27 <br />iii <br />