6027

• UCREFRP Catalog Number: 6027
• Author: Tyus, H. M., R. L. Jones and L. A. Trinca.
• Title: Green River Rare and Endangered Fish Studies, 1982-85
• USFW Year: 1987.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

White River Fishes Study (Miller et al. 1982a). The Yampa study was funded by
Congress (by direct appropriation), the FWS, and the National Park Service
(NPS). The White River Study was funded by the Bureau of Land Management
(BLM) and FWS. Because the White and Yampa rivers are primary components of
the Green River drainage, results of all of these studies should be considered
concurrently for a holistic understanding of this complex ecosystem.
The BR and FWS began the Colorado River Fishery Monitoring Program (CRFMP)
in 1982 to further expand the information base for the endangered Colorado
squawfish. There were three specific objectives of the CRFMP study:
1. To expand information on the distribution and movement of
adult Colorado squawfish to and from spawning site locations with
the use of radiotagging. Area of study to include headwaters of
Lake Powell, the Gunnison, Colorado and Green rivers.
2. To verify flow requirements of adult Colorado squawfish in relation
to spawning success and survival of larval Colorado squawfish.
3. To determine effects of flow fluctuation at Flaming Gorge Dam on the
survival and rearing of young-of-the-year (YOY) and juvenile
Colorado squawfish.
Objective 3 was removed from the study because flood conditions did not permit
BR sufficient flexibility in releases to provide the flows from Flaming Gorge
Dam required for the experimental work.
Both CRFP and CRFMP studies were based upon the rationale that the needs
of all rare and endangered fishes in the upper Colorado River basin would be
satisfied if gross habitat requirements were met for the Colorado squawfish.
This rationale was predicated on concept of species coevolution and the
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