8139

• UCREFRP Catalog Number: 8139
• Author: McAda, C., C. Philips, C. R. Berry and R. S. Wydoski.
• Title: A Survey of Threatened and Endangered Fish in Southeastern Utah Streams.
• USFW Year: n.d.
• USFW - Doc Type: \
• Copyright Material: NO

:.I conductivity are characteristically high. Tributaries in the headwater
regions of the large rivers are cool and clear and often support trout.
Tributaries at lower elevations rarely contain gamefish.
The rivers of the study area drain into the Colorado and Green Rivers.
These two large rivers are subject to less fluctuation in flow than the
smaller streams and support a more varied fish population. Trout can be
found in some sections of the large rivers, but warm water species are the
dominant gamefish. Suckers and minnows are abundant throughout the two
rivers.
MATERIALS AND METHODS
Literature Search
Fish collection record: from the Utah Division of Wildlife Resources
(UDWR) and other sources were reviewed to determine fish distribution in
the NRL. From this data, streams on which little or no information was
available were identified and listed as sampling sites for further field
investigations.
Published literature on fish life history was also reviewed and a
brief summary of the life history of each rare fish completed. The life
history summaries are intended as a guide to the literature if more de-
tailed information is required. Distribution of fish of unusual interest
was shown on small scale topographic maps (U.S.G.S, 1:250,000).
Hydrologic, temperature and conductance data was compiled from
information collected by the U.S. Geological Survey (U.S.G.S.) at stations
within the NRL (Figure 2). Discharge for each calender year (1970-1974)
was summarized as: total discharge (CFS), mean CFS, maximum CFS, and
minimum CFS. Instantaneous discharge (CFS), temperature and conductance
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