9583

• UCREFRP Catalog Number: 9583
• Author: BIO/WEST Inc.
• Title: Annual Summary Report 1993 - Survival of Age-0 Colorado Squawfish in the Green and Colorado Rivers ‎(UDWR Contract No. 90-2558)‎.
• USFW Year: 1994.
• USFW - Doc Type: Logan, UT.
• Copyright Material: NO

TABLE OF CONTENTS '
Page
EXECUTIVE SUMMARY ......................................................... iii '
ACKNOWLEDGEMEN'I'S ......................................................... vi ,
1.0 INTRODUCTION ............................................................. 1
1.1 OBJEC'T'IVES ..........................................................
1
2 BACKGROUND 1
1
.
........................................................
2.0 METHODOLOGY ............................................................ 2
1
3.0 RESULTS ................................................................... 4
3.1 REACH 3 -THE LOWER GREEN RIVER .................................. 4
3.1.1 1987 Year Class .................................................
3.1.2 1988 Year Class ................................................. 4
4
3.1.3 1989 Year Class ................................................. 5
3.1.4 1990 Year Class .................................................
3.1.5 1991 Year Class ................................................. 5
6
3.1.6 1992 Year Class ................................................. 6
3.1.7 1993 Year Class ................................................. 6
3.1.8 Sympatric Species ............................................... 6
3.2 REACH 4 -THE UPPER GREEN RIVER ................................... 7
3.2.1 1989 Year Class ................................................. 7
3.2.2 1990 Year Class .................................................
3.2.3 1991 Year Class ................................................. 7
7 '
3.2.4 1992 Year Class ................................................. 7
3.3 REACH 1 -THE LOWER COLORADO RIVER ..............................
3.3.1 1987 Year Class ................................................. 7
? '
3.3.2 1988 Year Class ................................................. 8
3.3.3 1989 Year Class ................................................. 8
3.3.4 1990 Year Class ................................................. 8
3.3.5 1991 Year Class ................................................. 9
3.3.6 1992 Year Class ................................................. 9
4.0 DISCUSSION ............................................................... 17
4.1 HYPOTHESIS ........................................................ 17
4.1.1 Ho 1: Age-0 squawfish use of habitats unavailable to conventional seining
methods . ...................................................
17
4.1.2 Ho 2: Age-0 squawfish move or are transported into and from the region. ... 18
4.1.3 Ho 3: Overwinter mortality contributes to decreases of age-0 squaw6sh. ..... 20
4.2 SUMMARY .......................................................... 21 '
5.0 RECOMMENDATIONS ....................................................... 22
LITERATURE CITED ........................................................... 23 ,
LIST OF APPENDICES
'
APPENDIX A -LENGTH FREQUENCY HISTOGRAMS AND DISTRIBUTION CHARTS
iv 1
1