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Last modified
7/14/2009 5:02:28 PM
Creation date
5/22/2009 4:43:05 PM
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UCREFRP
UCREFRP Catalog Number
6042
Author
Haynes, C. M., R. T. Muth and T. P. Nesler.
Title
Identification of Habitat Requirements and Limiting Factors For Colorado Squawfish and Humpback Chub.
USFW Year
1985.
USFW - Doc Type
Fort Collins, Colorado.
Copyright Material
NO
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<br />20 <br /> <br />Yampa-Green River Study Area <br /> <br />General <br /> <br />A total of 1,326 seine and dip net samples were taken in the Yampa River <br />during 1980-1984 (Table 1) and 19 fish species were collected (Table 6). <br />Virtually 100% of the fish sampled were cyprinids and catostomids. During <br />1981-1982, non-native fishes predominated, constituting 51% and 56% of the <br />total catch, respectively. Red shiners, sand shiners and fathead minnows <br />were the dominant non-native species collected. Unidentified Gila spp. and <br />speckled dace were the most common native species. In 1983, native fishes <br />constituted 82% of all individuals collected, predominated by Gila spp., <br />speckled dace, and bluehead suckers. <br /> <br />A 267-mm (TL) humpback chub was collected by gill net in upper Cross <br />Mountain Canyon (August 1980); representing a range extension for this <br />species. <br /> <br />Thirteen fish species were collected in 420 drift-net samples at the <br />Yampa River sites (1983-1984), while 8 species were collected in 155 <br />drift-net samples at the Green River (state line) site in 1984 (Tables 1, 7, <br />and 8). Almost all fish collected were cyprinids, catostomids and <br />ictalurids. In 1983, 4,495 individu~ls, mostly larvae (juvenile and adult <br />forms contributed less than 5%), were collected at both Yampa River sites <br />combined (Table 7). Total catch at Harding Hole was almost twice the Box <br />Elder catch. Twelve species were collected at Harding Hole, of which sand <br />shiner, white sucker (Catostomus commersoni), and mottled sculpin (Cottus <br />bairdi) were exclusive to this site. Ten species were sampled at Box Elder; <br />red shiner was the only species exclusive to this locality. Native species, <br />represented by Gila spp., speckled dace and bluehead suckers, were far more <br />abundant than non=natives at both sites and accounted for 83% of the total <br />combined catch. Channel catfish was the predominant non-native species <br />collected at both sites, but were sampled in substantial numbers only at Box <br />Elder (i.e., 514 individuals=34% of total catch). <br /> <br />In 1984, 9 species were collected by drift-net sampling at Box Elder, <br />while 8 species were collected at State Line. A total of 3,607 individuals, <br />predominantly larvae, were sampled at both sites combined. The catch at <br />State Line was less than one-third the Box Elder catch. Redside shiner and <br />sand shiner were exclusive to Box Elder and fathead minnow was exclusive to <br />State Line. Native fishes (same species) were again far more abundant than <br />non-natives and accounted for 65% and 72% of the total catch in the Yampa and <br />Green rivers, respectively. As in 1983, channel catfish was the most <br />commonly collected non-native species. <br /> <br />~ <br />
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