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Last modified
7/14/2009 5:02:37 PM
Creation date
5/20/2009 9:32:33 AM
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UCREFRP
UCREFRP Catalog Number
9677
Author
Karp, C. A. and H. M. Tyus.
Title
Habitat Use, Spawning, and Species Associations of Humpback Chub, Gila cypha, in the Yampa and Green Rivers, Dinosaur National Monument, Colorado and Utah - Preliminary report.
USFW Year
n.d.
USFW - Doc Type
Vernal, UT.
Copyright Material
NO
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Species Associations <br />Humpback chub were captured in association with 18 fish species, <br />including 7 native and 11 non-native forms (Table 2). Species dominating <br />the catch included native roundtail chub (2.1 fish/h angling and 10.5 <br />fish/h electrofishing), flannelmouth sucker Catostomus latipinnis (21.1 <br />fish/h electrofishing), and bluehead sucker C. discobolus (30.7 fish/h <br />electrofishing), and non-native channel catfish Ictalurus punctatus (3.3 <br />fish/h angling and 19.6 fish/h electrofishing) and common carp (24.7 <br />fish/h electrofishing). Incidental species were native Colorado squawfish <br />Ptvchocheilus lucius, razorback sucker Xyrauchen texanus, mountain <br />whitefish Prosopium williamsoni, and sculpins Cottus species, and non- <br />native black bullhead I. melas, northern pike Esox lucius, white sucker C. <br />commersoni, green sunfish Lepomis cyanella, smallmouth bass Micropterus <br />dolomeui, and four species of trout (Oncorhynchus mvkiss, 0. clarki, Salmo <br />trutta, and Salvelinus namavcush; Table 2). <br />In large eddies yielding humpback chub by angling, roundtail chub <br />comprised about 45% (N=159), channel catfish about 35% (N=121), and <br />humpback chub about 15% (N=51) of the catch. Other species (including <br />Colorado squawfish, flannelmouth sucker, common carp, black bullhead and <br />trout) composed less than 5% of the angling catch. Electrofishing catch <br />was dominated by the 2 suckers, roundtail chub, channel catfish and common <br />carp. Except for the roundtail chub, these fishes were common in all three <br />canyons (Table 2). <br />Roundtail chub (N=1,482) were most abundant in Yampa Canyon but also <br />occurred in Whirlpool Canyon (at least 3 times more fish were captured in <br />Yampa Canyon than in Whirlpool Canyon; Table 2). No roundtail chubs were <br />10
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