8188

• UCREFRP Catalog Number: 8188
• Author: Muth, R. T., et al.
• Title: Flow and Temperature Recommendations for Endangered Fishes in the Green River Downstream of Flaming Forge Dam.
• USFW Year: 2000.
• USFW - Doc Type: \
• Copyright Material: NO

Final Report September 2000

3.5.2 Ice Conditions .............................................. 3-34
3.6 Geomorphic Processes in the Green River .............................. 3-36
3.6.1 Channel Planforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37
3.6.1.1 Restricted and Fixed Meanders.......................... 3-37
3.6.1.2 Canyon Reaches with Abundant Debris Fans . . . . . . . . . . . . . . . 3-39
3.6.2 Sediment Dynamics, Shoreline Complexity, and
Low-Velocity Habitats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-40
3.6.3 Sediment Dynamics and Spawning Substrates ..................... 3-44
3.6.4 Vertical Accretion of Banks and Channel Narrowing. . . . . . . . . . . . . . . . 3-45
3.6.5 Floodplain Inundation ........................................ 3-47
3.7 Summary of Relationships between Flow, In-Channel Habitats, and
Floodplain Inundation .............................................. 3-50

4 FISHES OF THE GREEN RIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.1 Overview......................................................... 4-2

4.1.1 Native Fishes ................................................ 4-2
4.1.2 Nonnative Fishes ............................................. 4-6
4.2 Colorado Pikeminnow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
4.2.1 Distribution and Status Overview ............................... 4-12
4.2.2 Life History Overview .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
4.2.3 Research on Colorado Pikeminnow for the 1992 Flaming Gorge
Biological Opinion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
4.2.4 Research on Colorado Pikeminnow for the 1990-1996 Flaming
Gorge Flow Recommendations Investigation ...................... 4-14
4.2.5 Ecology of Colorado Pikeminnow in the Green River System ......... 4-14
4.2.5.1 Distribution and Abundance. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
4.2.5.2 Life History by Season ................................ 4-21
4.2.5.3 Recruitment Dynamics ................................ 4-32
4.2.5.4 Limiting Factors for Colorado Pikeminnow in Historic
Green River Habitat .................................. 4-37
4.2.6 Summary of Seasonal Flow-Habitat Relationships for Colorado
Pikeminnow in the Green River System .......................... 4-41

4.2.6.1 Spring............................................. 4-41

4.2.6.2 Summer and Autumn ................................. 4-42

4.2.6.3 Winter............................................. 4-43

4.3 Razorback Sucker ................................................. 4-49
4.3.1 Distribution and Status Overview ............................... 4-49
4.3.2 Life History Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-50
4.3.3 Research on Razorback Sucker for the 1992 Flaming Gorge
Biological Opinion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-51
4.3.4 Research on Razorback Sucker for the 1990-1996 Flaming Gorge
Flow Recommendations Investigation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-51
4.3.5 Ecology of Razorback Sucker in the Green River System. . . . . . . . . . . . . 4-52
4.3.5.1 Distribution and Abundance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-52
4.3.5.2 Life History by Season ................................ 4-54

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