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TABLE OF CONTENTS <br />INTRODUCTION AND BACKGROUND <br />~ 1 <br />~ <br />BIOLOGICAL OPINION <br />~ <br />~ <br />~ ~ 3 <br />~ <br />DESCRIPTION OF FLAMING <br />GORGE <br />OPERATION 4 <br />~ ~ <br />BACKGROUND 4 <br />OPERATION 4 <br />BASIS FOR OPINION <br />~ <br />~ 5 <br />~ <br />DEVELOPMENT AND EXTENT <br />OF PERTINENT SCIENTIFIC <br />DATA BASE 7 <br />GREEN AND YAMPA RIVER COMPLEX 9 <br />ENDANGERED FISH 9 <br />COLORADO SQUAWFISH 10 <br />General Status 10 <br />Adults 10 <br />_ <br />Migration 12 <br />Spawning <br />~ 12 <br />Larvae and <br />Postl arvae 14 <br />Juveniles ~. 16 <br />HUMPBACK CHUB 16 <br />General Status 16 <br />Adults 16 <br />Spawning <br />~ 17 <br />Larval and <br />Juveni 1 e . " 18 <br />BONYTAIL CHUB <br />~ 18 <br />Status and <br />Distribution 18 <br />Adults 18 <br />Spawning 19 <br />Larval and Juvenile 19 <br />RAZORBACK SUCKER 19 <br />General Status 19 <br />Adults 20 <br />Migration 20 <br />Spawning <br />~ 20 <br />Larval and <br />Juveni 1 e 21 <br />EFFECTS OF THE ACTION 22 <br />ENVIRONMENTAL BASELINE 23 <br />CUMULATIVE EFFECTS <br />~ <br />~ P4 <br />CONSIDERATIONS IN DEVELOPING <br />A <br />REASONABLE AND PRUDENT ALTERNATIVE 24 <br />Spring 25 <br />Colorado squawf i sh 25 <br />Humpback chub 26 <br />Razorback sucker 26 <br />Bonytai 1 chub 26 <br />Summer 26 <br />Colorado squawfi sh 26 <br />Humpback chub 27 <br />Bonytail chub 21 <br />Razorback sucker 27 <br />iii <br />