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WSP07684
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Last modified
1/26/2010 2:28:26 PM
Creation date
10/12/2006 2:32:01 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.200.10.B
Description
UCRBRIP Annual Report
Basin
Colorado Mainstem
Date
12/22/1997
Author
UCRBRIP
Title
1997 Annual Reports Package Part 3
Water Supply Pro - Doc Type
Publication
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<br />species representing at least 1 % of the fish collected are 44% chub, 36% speckled <br />dace, 4% bluehead sucker, 3% flannel mouth sucker, 3% sand shiner, 3% red shiner, <br />2% fathead minnow, 2% Colorado squawfish, 2% carp, and I % white sucker. <br /> <br />As in 1994 and 1995, Colorado squawfish successfully spawned in both the Gunnison <br />River and in the Colorado River below the confluence with the Gunnison River. <br />Seven specimens were taken in the Gunnison River in 1996, four above the Redlands <br />Dam and three below. One larva was taken at river mile 29.3, the "Bridgeport" <br />station (GU-B), three at river mile 5.2, the "R. Schroder" station (GU-S), and three <br />(including one tentatively identified specimen--CS?) at river mile 2.6, the "Above <br />Confluence" station (GU-A). By comparison, six Colorado squawfish were identified <br />in 1995 drift net collections in the Gunnison River and just one in 1994. Like 1994 <br />and 1995, most 1996 Colorado squawfish larvae (87%) were collected at Colorado <br />River stations below the confluence with the Gunnison River: 10 specimens at river <br />mile 167.8 (Red lands station) and 35 at river mile 153.7 (Loma station). However, <br />Colorado squawfish captures at these stations in 1996 (45) were notably lower than in <br />1994 (96) and much lower than in 1995 (257). Colorado squawfish larvae (including <br />tentatively identified specimens) measured 7 to 11 mm TL and were taken from 19 <br />June through 14 August, but mostly (87%) after 15 July. The first specimens were <br />captured over two weeks earlier than in 1994 and nearly seven weeks earlier than in <br />1995. <br /> <br />(b) Larval-Fish Drift-Net Collections, Colorado River, Westwater and Moab, Utah, 14 <br />June through 17 August 1994 (processing, cataloging, and report completed from FY <br />96). <br /> <br />This set consists ofJ71 larval-fish drift-net collections received by the Larval Fish <br />Laboratory. Of these, 186 were taken at the Westwater station (River Mile 127.5), <br />and 185 at the Moab station (RMI 65.8). Fish were present in 89% of the collections <br />received (332 of371). All specimens received have been cataloged (LFL 34561- <br />35459) and stored as part of Larval Fish Laboratory holdings for voucher and future <br />study, possibly including detailed analysis of chubs (Gila sp.) and early non-native <br />cyprinid larvae for species identification. questionable Colorado squawfish larvae for <br />DNA verification, and Colorado squawfish otoliths for age determination. <br /> <br />) <br /> <br />Overall, the collections contain 5,657 fish (an average of 15 specimens per collection) <br />representing 14 species. Minnows (7 species) account for 94% and suckers (2 <br />species) 5% of all fish collected in 1994. Non-cypriniform fish, just 1 % of all fish <br />collected, are channel catfish, black bullhead, mosquitofish, green sunfish, and <br />largemouth bass; channel catfish were taken from both stations and the others only <br />from Westwater. Native species (3 minnows and 2 suckers) account for 18% of all <br />fish, 13% of the minnows, and 100% of the suckers. Colorado squawfish (54 <br />specimens of which 12 are tentative identifications-CS?) account for 1 % of all fish <br />and are present in 12% of the collections (45 ofJ 71). <br /> <br />11 <br />
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