8068

• UCREFRP Catalog Number: 8068
• Author: Bestgen, K. R., R. T. Muth and M. A. Trammell.
• Title: Downstream transport of Colorado squawfish larvae in the Green River drainage
• USFW Year: 1998.
• USFW - Doc Type: temporal and spatial variation in abundance and relationships with juvenile recruitment.
• Copyright Material: NO

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TABLE OF CONTENTS
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EXECUTIVE SUMMARY ........................................................................................................ 111
LIST OF TABLES .....................................................................................................................V
LIST OF FIGURES ..................................................................................................................Vl
INTRODUCTION ..................................................................................................................... 1
Colorado squawfish natural history ........................................................................ 2
STUDY AREA .........................................................................................................................4
METHODS .............................................................................................................................. 5
Field collections .......................................................................................................5
Laboratory procedures ............................................................................................ 6
Diel and cross-channel abundance of larvae ......................................................... 7
Position, time, and date effects on age and TL of larvae captured ........................ 8
Annual transport abundance ................................................................................. 8
Fall recruitment of juveniles ..............................................................:.................... 9
RESULTS ..............................................................................................................................10
Timing of reproduction ..........................................................................................10
Inter- and intra-annual abundance patterns of larvae ..........................................11
Diel and cross-channel patterns of abundance of larvae .......................................12
Position, time, and date effects on age and TL of larvae captured ........................14
Transport abundance related to discharge ............................................................15
Fall recruitment of juveniles related to transport abundance ...............................16
DlscussloN ........................................................................................................................ 17
' Timing of reproduction ......................................................................................... 17
Inter- and intra-annual abundance patterns of larvae ...........................................18
' Diel and cross-channel patterns of abundance of larvae .:::::::::::::::::::::::::::::::::::::~~
Transport abundance related to discharge ..................
Fall recruitment ofjuveniles related to transport abundance ...............................24
' Conclusions ............................................................................................................25
Recommendations .........................................................................................~. . 28
' ACKNOWLEDGMENTS ..........................................................................................................29
REFERENCES ....................................................................................................................... 3 O

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