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CONTENTS <br />Page <br />INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br />Scope of Study . . . . . . . . . . . . . . . . . . . . . . . . 1 <br />• <br />HABITAT AND GEOPHYSICAL CHARACTER, UPPER COLORADO RIVER BASIN 5 <br />+ DISTRIBUTION AND LIFE HISTORY OF MAJOR FISHES . . . . . . . . . . 7 <br />Colorado Squawfish . . . . . . . . . . . . . . . . . . . . . . 7 <br />Distribution and Abundance . . . . . . . . . . . . . . . . . 7 <br />Migration and Movement . . . . . . . . . . . . . . . . . . . 10 <br />Habitat Selection . . . . . . . . . . . . . . . . . . . . . 11 <br />Limiting Factors . . . . . . . . . . . . . . . . . . . . . . 14 <br />Humpback Chub . . . . . . . . . . . . . . . . . . . . . . . . . 18 <br />Distribution and Abundance . . . . . . . . . . . . . . . . . 18 <br />Migration and Movement . . . . . . . . . . . . . . . . . . . 19 <br />Habitat Selection . . . . . . . . . . . . . . . . . . . . . 19 <br />Limiting Factors . . . . . . . . . . . . . . . . . . . . . . 20 <br />Bonytail Chub . . . . . . . . . . . . . . . . . . . . . . . . 23 <br />Distribution and Abundance . . . . . . . . . . . . . . . . . 23 <br />Migration and Movement . . . . . . . . . . . . . . . . . . . 23 <br />Habitat Selection . . . . . . . . . . . . . . . . . . . . . 24 <br />Limiting Factors . . . . . . . . . . . . . . . . . . . . . . 24 <br />Razorback Sucker . . . . . . . . . . . . . . . . . . . . . . . 25 <br />Distribution and Abundance . . . . . . . . . . . . . . . . . 25 <br />Migration and Movement . . . . . . . . . . . . . . . . . . . 26 <br />Habitat Selection . . . . . . . . . . . . . . . . . . . . . 27 <br />Limiting Factors . . . . . . . . . . . . . . . . . . . . . . 27 <br />Other Native and Exotic Species . . . . . . . . . . . . . . . . 28 <br />DISCUSSION . . . . . . . . . . . . . . . . . . . . . . . . . 31 <br />Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 <br />Requirements . . . . . . . . . . . . . . . . . . . . . . . 31 <br />Recovery of Target Species . . . . . . . . . . . . . . . . . . 37 <br />CONTENTS OF PARTS 2 AND 3 . . . . . . . . . . . . . . . . . . . . 38 <br />LITERATURE CITED . . . . . . . . . . . . . . . . . . . . . . . . . 39 <br />GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 <br />' TABLES <br />• Number Page <br />1 Changes i n peak flow in the Green and Colorado Rivers <br /> as a re sult of major impoundments . . . . . . . . . . . 5 <br />2 Colorado squawfish capt ures in the Colorado and Green <br /> Rivers, standardized sampling, 1979-1981 . . . . . . . 8 <br />i