9683

• UCREFRP Catalog Number: 9683
• Author: Valdez, R. A.
• Title: a Survey of Fish Collections in the White River, Utah.
• USFW Year: 1984.
• USFW - Doc Type: Logan, UT.
• Copyright Material: NO

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13

available habitat and temperature regimes which directly affect spawning
succeSs and year class strength. Discharge and temperature also affect
longitudinal distribution of fishes, i.e. species move upstream or
downstream to spawn or in response to cooling or warming temperatures.

Threatened and Endangered Fishes
Only two species of endangered fishes have been cau9ht in the White
River in Utah; these are the Colorado squawfish and the humpback chub.
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Colorado squawfish were first found in the White River, Utah by Lanigan and
Berry (1979) in July 1978. A humpback chub was found in the White River,
Utah in June 1981 and reported in Miller et al.(1982). Lanigan and Berry
(1979) also reported a possible bony tail x humpback chub intergrade and a
razorback x flannelmouth sucker hybrid in July 1978 and June 1979,
respectively.
From July 1978 to September 1982, at least 83 Colorado squaVifish have
been caught in the White River, Utah (Table A-2). At least seven others
have been sighted and not captured. All of the squawfish reported ~er2
2it11er -Luvenilec; nr adults, ranging in size from 267 to 711 mm total length
and from 130 to 2830 g total weight.
The location of 46 known squawfish capture sites is presented in Figure
1 along with fish sdlaple sites. Up to 15 squawfish have been captured in a
5-mile reach of river (RM 0-5). All other reaches have yielded one to four
known captures. The distribution of these capture sites indicates that the
endangered Colorado squawfish occurs periodically throughout the lower White