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TABLE OF CONTENTS APPROVAL PAGE..........................................................................................................................ii LIST OF TABLES............................................................................................... ............................iv LIST OF FIGlJRES ......................................................................................................................... vi LIST OF APPENDIX TABLES.... ............... ................................................................................... vii LIST OF APPENDIX FIGlJRES ................................. ................................................................... vii INTRODUCTION............................................ ................... ............................................................. 1 STUDY AREA................................................................................................................................. 3 METHODS............................................................................................................................ .........11 Fish samples........................................................... ............................................................. 11 Habitat mapping.................................................................................................................. 12 Hydraulic simulation .......................................................................................................... 15 Habitat availability............................................................................................................. .15 RESULTS and DISCUSSION ...................... ................................................ ............ ......................17 Species Composition.......................................................................................................... .17 Yampa River ................................................................................................................ 17 Colorado River ............................................................................................................. 23 Dolores River................................................................................................................ 26 Size Structure (Yampa, Colorado and Dolores Rivers)......................................................... 27 Density Estimation.............................................................................................................. 34 Yampa River ................................................................................................................ 34 Colorado River ............................................................................................................. 39 Dolores River ............................................................................................................... 41 Habitat Composition (Duffy and Colorado River)............................................................... 42 Radio Telemetry ....................................... ............. ....................... ......................................50 SUMMARY ........................._........................................... ........ .....................................................51 CONCLUSIONS AND RECOMMENDATIONS........................................................................... 52 ACKNOWLEDGEMENTS ............................................................................................................ 53 REFERENCES......................... ................................ ................ .......... ............................................54 APPENDIX TABLES AND FIGlJRES ........................ .................................................................. 57 11l I I I I I I I I I I I I I I I I I I I