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Last modified
7/14/2009 5:02:30 PM
Creation date
5/22/2009 12:54:35 PM
Metadata
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UCREFRP
UCREFRP Catalog Number
7394
Author
Grabowski, S. J. and S. D. Hiebert.
Title
Some Aspects of Trophic Interactions in Selected Backwaters and the Main Channel of the Green River, Utah 1987 - 1988.
USFW Year
1989.
USFW - Doc Type
Denver, Colorado.
Copyright Material
NO
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<br />backwaters associated with the Green River are important nursery habitats for <br />larval and young-of-the-year (YOY) Colorado squawfish as well as other native <br />and nonnative fish species. <br /> <br />Radio telemetry studies of adult Colorado squawfish have revealed aggregations <br />of mature fish in the lower 20 miles of the Yampa River during early summer. <br />Evidence suggests both water temperature and hydrograph stage (Nesler et al. <br />1988; Tyus et al. 1987) and possibly other environmental factors, provide cues <br />for Colorado squawfish spawning. Spawning can occur from late June through <br />August. The squawfish eggs incubate in the substrate for about 6 days. After <br />hatching and emerging from the gravel, the larval Colorado squawfish drift <br />passively down the Yampa River to the Green River, then down the Green River <br />into low water velocity nursery areas such as backwaters. Backwater habitat <br />is important for young Colorado squawfish (Tyus et al 1987; Valdez and Wick <br />1983), provides some protection from fluctuating flows and high discharges, <br />and is generally more productive than main river habitats (Holland and Huston <br />1984). Kallemeyn and Novotny (1977), cited in Persons (1979), and Sheaffer <br />(1984) reported that many fish species preferred backwater areas, and that <br />backwater areas were important spawning and nursery areas for some species of <br />fish. The success (survival) of the larval and young Colorado squawfish in <br />Green River nursery areas probably depends on the ecological characteristics <br />of the habitat and their ability to exploit the available resources. Feeding <br />habits of young fish, food availability, some limnological characteristics, <br />and development and relationship of main river and backwater habitat in the <br />Green River occupied by young Colorado squawfish are not well known. <br />The goal of this study was to augment existing information on the physical, <br /> <br />9 <br />
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