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TABLE OF CONTENTS <br />TABLE OF CONTENTS ............................................................. ii <br />LIST OF TABLES ..................................................................iv <br />LIST OF FIGURES ................................................................ vii <br />ACKNOWLEDGMENTS ............................................................ x <br />EXECUTIVE SUA'IIVIARY ........................................................... xi <br />LIST OF KEY WORDS ............................................................ xii <br />INTRODUCTION .................................................................. 1 <br />STUDY AREA ..................................................................... 2 <br />Colorado River Hydrology ...................................................... 2 <br />METHODS ........................................................................ 3 <br />Young of year ................................................................ 3 <br />Fish Communiry .............................................................. 4 <br />RESULTS ......................................................................... 5 <br />Reproduction and Early Life History ............................................. 5 <br />Hatching Dates /Spawning Period ......................................... 5 <br />Growth of Age 0 Chubs .................................................. 7 <br />Chub YOY Cohort Relative Abundance ...................................... 7 <br />YOY Chub Habitat ...................................................... 8 <br />Above the Canvon fRK 204-199.4) .................................. 9 <br />Westwater Canvon (RK 199.2 - 190.4) .............................. 11 <br />Below the Canvon (RK185.6 - 176.0) ............................... 13 <br />Sympatric Species ..................................................... 14 <br />Age 1 and Age 2 Gila spp Catch rates. - an index of recruitment ...................... 15 <br />Late .Tuvenile and Adult Monitoring ............................................. 16 <br />Sympatric Species ..................................................... 17 <br />PIT Tagging .......................................................... 17 <br />Species Identification and Sex Ratio ................................ 17 <br />Movement ..................................................... 18 <br />Growth ....................................................... 18 <br />Population Estimates ............................................ 19 <br />DISCUSSION ..................................................................... 20 <br />Reproduction and Early Life History ............................................ 20 <br />Hatching Dates /Spawning period ........................................ 20 <br />Growth of Age 0 chubs .................................................. 21 <br />Year Class Strength and Flow ............................................ 21 <br />YOY Chub Habitat ..................................................... 22 <br />Above Can on ................................................. 22 <br />ii <br />