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Table of Contents PREFACE ..................... .............................................. ~ PART I. FLAMING GORGE STUDIES Introduction ............................................................ 3 Environmental Setting ................................................... 3 Colorado River Fishes ..........................:....................... 5 Study Abstracts........ .............. ... ... .................. 6 Study 1: Summer and~fall~requirements of~age-0 Colorado squawfish in the Green River.. ..... ... ....... ........... 6 Study 2: Winter habitat and flows for adult and young Colorado squawfish and adult razorback sucker ............... ... ..... 7 Study 3: Spring and early summer flow requirements of Colorado squawfish, razorback sucker, and humpback chub ................ 9 Study 4: Fish community interactions of endangered and introduced fishes.. ... ............. ... .......................... 11 Study 5: Trophic dynamics and ecological interactions in important backwater habitats .......... ..... ........ .. ... ....... 13 Study 6: Mapping of important backwater habitats of~Colorado squawfish .................... ... 15 PART II. HABITAT USE AND STREAMFLOW NEEDS OF~COLORADO~SQUAWFISH,~HUMPBACK CHUB, AND RAZORBACK SUCKER .................................... 15 Colorado Squawfish ...................................................... 15 Adult .. ........................................................... Migration .......................................................... 16 Spawning...... .................................................. 17 Larvae and postlarvae .............................................. 18 Juveniles .......................................................... 20 Humpback Chub ........................................................... 21 Bonytail Chub ........................................................... 22 Razorback Sucker... .................................................. 23 PART III. SUMMARY AND RECOMMENDATIONS ...................................... 24 Summary... ................................:.......................... 24 General ............................................................ 24 Spring ............................................................. 26 Summer... ........................................................ 27 Autumn and~Winter .................................................. 27 Recommendations ......................................................... 28 Flow and Temperature ............................................... 28 Spring ...............................:........................ 28 Summer ........................................................ 28 Autumn ........................................................ 29 Winter ........................................................ 29 Other Management Options ........................................... 29 Bottomland restoration ........................................ 29 Flow re-regulation.. .................................... 29 Control of introduced fishes .................................. 29 Evaluation .................................................... 30 APPENDIX .. ................................................................ 31 LITERATURE~CITED ........................................................... 32 LIST OF FIGURES ............................................................ 38