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Last modified
7/14/2009 5:02:33 PM
Creation date
5/22/2009 7:27:59 PM
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UCREFRP
UCREFRP Catalog Number
8182
Author
Bestgen, K. R. and L. W. Crist.
Title
Response of the Green River Fish Community to Construction and Re-regulation of Flaming Gorge Dam. 1962-1996\
USFW Year
2000.
Copyright Material
NO
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<br />1 <br />Hybrid suckers comprised 3.9 % of all fishes captured and were 7 % of all suckers <br />captured by electrofishing in Lodore Canyon. Hybrids, particularly those involving white sucker <br />as a putative parent, were most abundant upstream and represented 9.0, 8.8, and 8.6 % of all <br />suckers captured in reaches 1 through 3, respectively. Hybrid abundance declined in reach 4 to <br />4.2 % of all catostomids captured. Abundance patterns of hybrids was positively correlated with <br />reduced downstream abundance of introduced white suckers. <br />Shifts in size structure were noted for several species along the longitudinal gradient of <br />Lodore Canyon. Length frequency histograms for brown trout, and white, bluehead, and <br />flannelmouth suckers suggested large adults were present throughout reaches 1 through 4 (Figs. 6 <br />to 9). More fish < 300 mm TL occurred in downstream reaches 3 and 4, particularly white and <br />bluehead suckers. Those juvenile-sized fishes were typically found in relatively shallow riffles <br />with rounded cobble substrate, habitat which was more prevalent in lower Lodore Canyon. <br />Upstream reaches 1 and 2 had more deep runs with larger, angular substrate particles. <br />Drift net sampling.--Very few fishes were captured in drift net samples collected in any <br />year. Drift net sampling in 1993 was conducted on 30 July and 6 August; a total of 10 speckled <br />dace, four bluehead suckers, and three flannehnouth suckers were captured in the four samples. <br />Drift net sampling in 1994 was conducted from 28 June to 5 August; a total of 307 fishes in six <br />species was captured in 99 samples. Bluehead sucker was the most common species collected (N <br />= 148), followed by flannelmouth sucker (N = 81), speckled dace (N = 72), unidentified suckers <br />(N = 3), and a single specimen each of white sucker, sand shiner, and Gila sp., presumably <br />roundtail chub. Most of those fish (N = 223, 72.6 %) were captured on 7 July, and 93 % were <br />catostomids. Water turbidity was very high due to a thunderstorm on 6 July but discharge did <br />not increase appreciably. Drift net sampling in 1995 was conducted from 8 through 15 August in <br />1995, and a total of 30 fishes in four species were captured in 24 samples. Bluehead sucker was <br />the most common species (N = 22), followed by flannelmouth suckers (N = 3), speckled dace (N <br />= 1), and white sucker (N = 2). Most of those fish (N = 16, 53 %) were collected on 15 August <br />when water turbidity was high. <br />20 <br />
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