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Last modified
7/14/2009 5:02:29 PM
Creation date
5/24/2009 7:08:08 AM
Metadata
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UCREFRP
UCREFRP Catalog Number
7047
Author
Tyus, H. M. and C. A. Karp.
Title
Habitat Use and Streamflow Needs of Rare and Endangered Fishes in the Green River, Utah
USFW Year
1991.
USFW - Doc Type
Final Report.
Copyright Material
NO
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Report 15- Abundance, growth, and diet of channel catfish, Ictalurus <br />punctatus, in the Green and Yampa Rivers, Colorado and Utah. (Tyus <br />and Nikirk 1990) <br />Channel catfish were widely distributed in 517 km of the mainstream <br />Green and 74 km of the lower Yampa rivers in 1987 and 1988. The fish was most <br />abundant in rocky canyon habitats (average stream gradient >2 m/km), where <br />adult fish comprised 14% of electrofishing and 70% of angling catch. Pectoral <br />spine sections of 364 channel catfish of 27-756 mm total length ranged in age <br />from 0 to 22 years respectively, with an average annual growth range of 17-53 <br />mm. No difference in growth or condition factor was detected among catfish <br />collected in eight river reaches. Growth of channel catfish in the Green River <br />basin was judged slow in comparison to other areas of the United States and <br />was attributed, in part, to cold water temperatures, short growing seasons, <br />and elevated summer flow conditions. Channel catfish consumed a variety of <br />food items, but piscivory was limited to larger fish (average length 420 mm). <br />Of 575 stomachs with food (76.2%), 31% contained aquatic invertebrates, 28% <br />contained vascular plant material, 22% contained terrestrial insects, 10% <br />contained algae and detritus, and 8.5% contained fish and mice. The abundance, <br />widespread distribution, and omnivorous feeding behavior of this introduced <br />fish may affect populations of rare and endangered fishes in the Green River <br />basin. (Abstract) <br />Report 16- Migrating Mormon crickets, Anabrus sim lex (Orthoptera: <br />Tettigoniidae), as food for stream fishes. (Tyus and Minckley 1988) <br />Migrating bands of Mormon crickets (Anabrus simplex) were observed <br />crossing the Green and Yampa rivers in Dinosaur National Monument, Colorado <br />and Utah, in 1986 and 1987. Swimming crickets were swept downstream and eaten <br />by four endemic and seven introduced fish species. Included were two <br />endangered fishes, Colorado squawfish (Ptychocheilus Lucius) and humpback chub <br />(Gila cypha). Direct and indirect effects to aquatic food webs associated with <br />application of pesticides for Mormon cricket control may pose a threat to <br />these fishes and to man. (Abstract) <br />Study 5: Trophic dynamics and ecological interaction in important backwater <br />habitats. <br />Report 11- Some aspects of trophic interactions in selected backwaters and the <br />main channel of the Green River, Utah. (Grabowski and Hiebert 1989) <br />Green River backwaters and adjacent channels were sampled in the Island <br />Park, Jensen, and Ouray reaches. Average seasonal water temperature was higher <br />downstream than upstream, and warmer in the backwaters than in nearby river <br />sites. Slightly warmer water temperatures and greater nitrogen and <br />phosphorous concentrations in Ouray backwaters may stimulate production of <br />blue-green algae; a major component of the <25 um size-fraction of <br />phytoplankton (nannoplankton) in backwaters. Zooplankton densities were low in <br />both the river and backwaters, but highest in Ouray backwaters. Larger <br />14 <br />
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