9533

• UCREFRP Catalog Number: 9533
• Author: Muth, R. T. and E. Wick.
• Title: Field Studies on Larval Razorback Sucker in Canyonlands National Park and Glen Canyon National Recreation Area, 1993-1995.
• USFW Year: 1997.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

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TABLE OF CONTENTS

Page

LIST OF TABLES ........................................................... v

EXECUTIVE SUMMARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. vi

INTRODUCTION ........................................................... 1
Subject of this Report .................................................. 1

METHODS ................................................................ 3

Description of Study Areas, Sampling Periods, River FlowlTemperature Regimes. . . . 3 I
Fish Collections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Diet of Adult Red Shiner ................................................ 4
Evaluation of Adult Red Shiner Exclosures .................................. 5
Marking Otoliths in Larval Suckers ........................................ 5
Enclosures to Study Growth and Survival of Razorback Sucker Larvae ............ 6

RESULTS AND DISCUSSION ................................................. 7
Fish Collections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Diet of Adult Red Shiner ............................................... 24
Evaluation of Adult Red Shiner Exclosures ................................. 27
Marking Otoliths in Larval Suckers ....................................... 27

CONCLUSIONS AND RECOMMENDATIONS ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

REFERENCES .................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

APPENDIX A, MEAN DAILY MAINCHANNEL WATER DISCHARGES AND TEMPERATURES
FOR THE GREEN RIVER, UTAH. APRIL-JULY 1993-1995.

APPENDIX B, MEAN DAILY MAINCHANNEL WATER DISCHARGES AND TEMPERATURES
FOR THE COLORADO RIVER. UTAH, APRIL-JULY 1993-1995.

APPENDIX C, DAILY WATER TEMPERATURES FOR 19 MAY-8 JULY 1995 INSIDE
MILLARD CANYON AND INSIDE FLOODED WASH AT BONITA BEND.

APPENDIX D. INDIVIDUAL DATA SHEETS FOR COLLECTIONS IN THE LOWER GREEN
RIVER, UTAH, 1994.

APPENDIX E, INDIVIDUAL DATA SHEETS FOR COLLECTIONS IN THE COLORADO RIVER,
UTAH,1994.

APPENDIX F. INDIVIDUAL DATA SHEETS FOR COLLECTIONS IN THE COLORADO RIVER
INFLOW TO LAKE POWELL. UTAH, 1994.

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