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TABLE OF CONTENTS <br />EXECUTIVE SUMMARY .........................................................lV <br />LIST OF TABLES ...............................................................V <br />LIST OF FIGURES .............................................................. V1 <br />INTRODUCTION ................................................................1 <br />STUDY AREA .................................................................2 <br />METHODS ....................................................................3 <br />Fish sampling,adults .....................................................3 <br />Fish sampling,larvae .....................................................5 <br />Data analysis, adults ..................................................... 6 <br />Length frequency data ..............................................8 <br />Abundance estimates ............................................... 8 <br />Survival estimates .................................................9 <br />Data analysis, larvae ....................................................10 <br />RESULTS ....................................................................11 <br />Razorback sucker distribution ............................................. 11 <br />Basinwide sampling, adults, 1996 to 1999 ................................... 12 <br />Middle Green River sampling, adults, 1980 to 1999 ............................ 13 <br />Abundance estimates ..............................................14 <br />Survival estimates ................................................ 15 <br />Otheradultfishsampling, 1996-1999 . ................................ 16 <br />Larvae, middle Green River ...............................................16 <br />Larvae, lower Green River ............................................... 18 <br />DISCUSSION .................................................................20 <br />Razorback sucker distribution ............................................. 21 <br />Basinwide sampling, adults, 1996 to 1999 ................................... 21 <br />Middle Green River adult population analyses, 1980-1999 ...................... 22 <br />Larvae, middle and lower Green River ...................................... 24 <br />Reasons for population declines ........................................... 28 <br />Future monitoring ......................................................31 <br />CONCLUSIONS ...............................................................36 <br />RECOMMENDATIONS ..........................................................37 <br />11 <br />