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Last modified
7/14/2009 5:02:29 PM
Creation date
5/20/2009 11:01:26 AM
Metadata
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UCREFRP
UCREFRP Catalog Number
7204
Author
Lanigan, S. H. and C. R. B. Jr.
Title
Distribution and Abundance of Endemic Fishes in the White River in Utah
USFW Year
1979.
USFW - Doc Type
Final Contract Report.
Copyright Material
NO
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45 <br />Humback Chub (Gila c ha) <br />The humpback chub is an unusual fish uniquely adapted for life in the <br />torrential current of the large rivers of the Colorado River basin. It's <br />most prominant characteristic is a large nuchal hump rising abruptly from <br />behind the head. The size of the hump is variable, and it may overhang the <br />occiput in large adults. The caudal peduncle is thin, but not elongated as <br />found in the bonytail chub (G. elegans). The mouth is inferior and overhung <br />by a pronounced snout. Fins are large and falcate (Holden et al., 1974). <br />The humpback chub has never been abundant in the Colorado basin. It <br />was originally described from a single specimen collected from the Grand <br />Canyon (Miller, 1946). At one time its range apparently extended down the <br />Colorado River as far as the present site of Hoover Dam (Minckley, 1974). <br />It was also found throughout the upper system including the Green and Yampa <br />Rivers. <br />Specimens of the humpback chub complex (Holden and Stalnaker, 1970) have <br />recently been collected in Echo Park on the Green River (McAda and Seethaler, <br />1975) and in Desolation Canyon (Holden and Stalnaker, 1975a). Specimens <br />most nearly representing the G. c ha type species, have been collected from <br />the Colorado River in Ruby Canyon (McAda et al., 1977). <br />A fish collected in the lower river (Figure 22) was identified as a <br />roundtail chub (Gila robusta) in the field. Its length was 345 mm and it had <br />bright red spawning colors on the ventral part of the body. Later examination <br />of several photographs (Figure 22) taken of the fish indicated it was not a <br />roundtail chub but was either a bonytail chub (Gila elegans) or a Gila ele ans <br />x Gila c ha hybrid (P. Holden, BioWest, Inc., personal communication). <br />Bonytail Chub (Gila ele ans) <br />The bonytail chub is the most streamlined of any fish found in the <br />Colorado River basin. The dorsal surface on the skull is concave and arches
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