7418

• UCREFRP Catalog Number: 7418
• Author: Tyus, H. M. and C. A. Karp.
• Title: Stream Flow Needs of Rare and Endangered Fishes, Yampa River, Colorado.
• USFW Year: 1988.
• USFW - Doc Type: Vernal, Utah.
• Copyright Material: NO

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spawning period at a river discharge that approached 0 cfs. This condition
' violated the basic assumption that "fish require water", and was not
acceptable for stream flow recommendations. Other Yampa River applications of
these curves (USFWS 1987b) were made for adult and spawning Colorado
squawfish, and humpback chub. Optimum "physical habitat" was maximized near
' 0, 1200, and 400 cfs, respectively. The lack of supportive biological data
' and the Lack of agreement between these outputs, makes adoption of a single
flow difficult. Because of these and other problems, FWS, in 1987, suggested
that model outputs be validated with empirical data before being used as
guidelines in protecting endangered fish habitat in Iarge river systems.
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