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<br />Table of Contents
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<br />PREFACE. . . . . . . . . . . , . . . . . . . . . , , , . . . . . . . . . . . . . . . . . . . . . . , , . . . . . . . . . . . . . . . . . . . ,
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<br />INTRODUCTION, ... . , . .. . . . . , . , . , .. . . . . . .. . , . .. .. . . . .. . .. . . . . , . . . . , , , . . . . , . .., 4
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<br />Environmental Setting,.....,.....".........................,........". 4
<br />Green River Basin Fishes................................................ 5
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<br />FLAMING GORGE STUDIES.................................................,..., 7
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<br />Background. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
<br />Study Abs tract s . . , . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . .. 8
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<br />Study I: Summer and fall requirements of age-O Colorado
<br />squawfish in the Green River..............................,... 8
<br />Study 2: Winter habitat and flows for adult and young Colorado
<br />squawfish and adult razorback sucker., ,.................. ,.., 9
<br />Study 3: Spring and early summer flow requirements of Colorado
<br />squawfish, razorback sucker, and humpback chub..,.. ....... .... 9
<br />Study 4: Fish community interactions of endangered and introduced
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<br />fi shes. , .. . . .. . .. . .. . . . .. . . . .. .. . .. .. . . .. . . .. . . .. . . . .. . . . . , ... 12
<br />Study 5: Trophic dynamics and ecological interactions in important
<br />backwater habitats...,................,.,.".................. 14
<br />Study 6: Mapping of important backwater habitats of Colorado
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<br />squawfi sh. . . . . . . , . , . . . . . . . . . . . , . . . . . . . . . . . , . . . , , . . , , . . , . . . . . .. 15
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<br />HABITAT USE AND STREAMFLOW NEEDS OF COLORADO SQUAWFISH, HUMPBACK
<br />CHUB. AND RAZORBACK SUCKER.............................,......,........ 15
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<br />Co 1 orado Squawfi s h. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16
<br />Adult............................... .'..........................,... 16
<br />Mi grat ion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 17
<br />Spawn i ng. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 18
<br />Larvae and postlarvae.............................................. 19
<br />Juveni 1 es.. . . .. .. ... .. .. . . .. . .. ... " . , . . . . .. .. . .. . . . .. . . ... . .. . , . ,. 21
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<br />Humpback Chub.......................................................... 22
<br />Bonyta i 1 Chub.......................................................... 24
<br />Razorback Sucker....................................................... 24
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<br />SUMMARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 26
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<br />General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 26
<br />Spri ng. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 28
<br />Summer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . .. 29
<br />Autumn and Winter...................................................... 30
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<br />RECOMMENDATIONS. . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . , . . , . ., 3 I
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<br />Flow and Temperature...........................,................... 3 I
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