7136

• UCREFRP Catalog Number: 7136
• Author: Johnson, J. E., et al.
• Title: Flaming Gorge Tailwater Fisheries Investigations
• USFW Year: 1987.
• USFW - Doc Type: Trout Growth, Harvest, Survival, and Microhabitat Selection in the Green River, Utah, 1978-82
• Copyright Material: NO

TABLE OF CONTENTS (continued)
Page
Site specific dye marks -- movement between stocking
sites . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Tagged trout -- effect of emigration on tag return. . . . . 77
Tagging to assess winter survival and time of emigration. 81
Summary -- seasonal mortality and migration of stocked
fingerlings . . . . . . . . . . . . . . . . . . . . . 95-
OBJECTIVE #3 -- DESCRIBE TROUT BEHAVIOR, MICROHABITAT
SELECTIVITY AND HABITAT SUITABILITY WITH RESPECT TO SPECIES,
LIFESTAGE, SEASON, AND DISCHARGE . . . . . . . . . . . . . . . . . . 97
METHODS - OBJECTIVE #3 . . . . . . . . . . . . . . . . . . . . . . 97
RESULTS - OBJECTIVE #3 . . . . . . . . . . . . . . . . . . . . . . 98
Life Stages . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Activity modes . . . . . . . . . . . . . . . . . . . . . . 99
Light intensity, depth, and distance from bottom . . . . . . . 99
Response to flow changes . . . . . . . . . . . . . . 104
Response to high discharge periods . . . . . . . . . . . . . . 105
Habitat simulation modeling. . . . . . . . . . . . . . . 113
Description of the PHABSIM stations . . . . . . . . . . . . 113
Habitat suitability curves . . . . . 114
Physical responses of PHABSIM stations to discharge . . . . 117
Habitat suitability . . . . . . . . . . . . . . . . . . . . 120
DISCUSSION - TROUT HARVEST, SURVIVAL, MIGRATION AND HABITAT
CONSIDERATIONS (OBJECTIVES #2 AND #3) . . . . . . . . . . . . . . . 131
Sportfishery trends . . . . . . . . . . . . . . . . . . . . . . . 131
Fish behavior, PHABSIM output, and supporting biological
data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
MANAGEMENT IMPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . 145
FUTURE STUDY NEEDS . . . . . . . . . . . . . . . . . . . . . . . . . 149
LITERATURE CITED . . . . . . . . . . . . . . . . . . . . . . . . . . 151
APPENDIX A - TROUT GROWTH . . . . . . . . . . . . . . . . . . . . . . 155
APPENDIX B - ANGLER USE, HARVEST TRENDS, TROUT MIGRATION, AND
MORTALITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
APPENDIX C - TROUT BEHAVIOR, MICROHABITAT SELECTIVITY, AND
HABITAT SUITABILITY. . . . . . . . . . . . . . . . . . . . . . 177
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