7144

• UCREFRP Catalog Number: 7144
• Author: Inslee, T. D.
• Title: Spawning and Hatching of the Razorback Sucker
• USFW Year: 1982
• USFW - Doc Type: Western Association of Fish & Game Agencies
• Copyright Material: NO

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formed along the shorelines, but most of the river is run type of
habitat. Backwaters are found at this time only in the flooded mouths
of washes (Walker Hollow, Baser Wash). One small riffle is located
near the center of the study area, at the middle station indicated
in Figure 1. Other small areas of cobble substrate are located along
the shorelines, especially below talus slopes. Over 99% of the river
bed is sand.
As waters recede in mid-summer, sandbars become exposed and create
a more heterogeneous mix of habitat types. Small backwaters become
quite common around the sandbars. Silt tends to become deposited in
the backwaters, adding to the complexity of substrate types.
River banks in the study area are prominent and many are actively
eroding. Willow (Salix sp.), salt cedar (Tamarix pentandra), and
other shrubs line the banks and large groves of cottonwoods (Populus
fremontii) occupy many of the older, more permanent, sandbars. Most of
the land surrounding the study area is rolling desert shrub, with some
agricultural use, especially between the upper and middle stations
(Figure 1).

Biological Characteristics

Literature Review
Literature referring to the aquatic biota of the Green River is
rare. Material relevant to the Moon lake study area is esrecially
scarce. The literature review, therefore, was expanded to include the
river from Split Mountain GorQe to Sand Wash. The literature review