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<br />. 'Bony tails stockel! in,Gteen,Col()rado rivers
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<br />BONYTAILS, from 1
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<br />tion that helps biologists evaluate the
<br />success of these stocking- efforts.' For
<br />example, one of the radio-tagged fish
<br />was discovered to have moved. down-
<br />stream 80 miles, Arid in June, two
<br />adult bonytailsdisplayed spawning
<br />, behavior, as evidenced by their tandem .
<br />movements throughout one "hot" sum-.
<br />mer night.
<br />. . The V.S, Fish and Wildlife Service
<br />listed the .bonytail as endangered in
<br />1980,.. .
<br />. :.' Scientists believe these fish popula- .
<br />. tions have .declined because of habitat
<br />changes . caused, by dwps, that have
<br />altered. the natUral fiver environment
<br />and because of, ~ontliptswith non-
<br />native fish species now present in the
<br />.Colorado River and its tributaries, To
<br />date; much of the endangered~fish '
<br />research nas focuse.d' on the, more-
<br />. prevalent Colorad<;l squawfish, accord-
<br />. ing to Chlirt. .
<br />'''We still need to learn more about
<br />bonytail. ecology, including . habitat
<br />preferences and spawning' hehavior,"
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<br />. _ . Photo cOurtesy of Dexter Natlo"nal Fish Hatchery
<br />Bony tails are one the of the rarest fish 111 the~lId. In the upper .Colorado
<br />River basin, they are nearly extinct. . . . .
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<br />. he said, "We'have beeri working under
<br />the assumption 'that 'What's good for,
<br />,the squawfish will be good for other
<br />. species as welL ' We're now in the
<br />,pos.ition to test that assumption: By ,
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<br />. puttingbonytails back into the river
<br />system, we can evaluate if we've cor-
<br />rected the problem', ,,'
<br />'- Brent Stettler,
<br />Utah Division. of Wildlife Resources
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