7384

• UCREFRP Catalog Number: 7384
• Author: Tyus, H. M.
• Title: Colorado Squawfish.
• USFW Year: n.d.
• USFW - Doc Type: Vernal, Utah.
• Copyright Material: NO

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requiremente of various life stages of the Colorado squawfish. Because water
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resources in the and west are hotly contested, identified life requirements
for water must be biologically defensible. These flow issues are national and
international in scope, potentially affecting water resources allocations
between the United States, Mexico, and the states of California, Colorado,
Nevada, New Mexico, Utah, and Wyoming.
The picture is also cloudy from an ecological perspective. Determination of
instream flow needs of nonendangered fishes in natural stream sections with
other native species need not be as exacting as for endangere`d fishes in
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altered streams with nonnative competitors. I~ the former situat~on, mistakes
can be corrected in time through reestablishment of natural populations. If
the stream in question is a put-and-take recreational fishery, more hatcher
reared fish can be stocked. In case of the etc Colorado River fauna :
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~'nstream flow determination is deadly serious. Limitei gene pools shouj.d not
not absolutely required to do so! Therefore, determination and implementation
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be sacrificed, and no successful, self sustaining population of this fish has
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ever bees reestablished onc~ it has been lost. No ecologist wishes to
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participate in the era 11 n of this faun"a~ *~.r^~~~ ~ ~'^' ^f pr fessional
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3udgement ~ And no water resources planner wishes to give up water rights if
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of instream flow ds is, at best, nearly impossible! ~ ~~ ~~~~Gr
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~n my opinion, recovery nee s o s es are est studie wee e s are
most abundant, in the Ieast altered, and most historic location; with the
premise that conditions to which they are best adapted are those in which they
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are most likely to maintain a competitive advantage over introduced forms. In