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Last modified
7/14/2009 5:02:36 PM
Creation date
5/22/2009 7:28:33 PM
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UCREFRP
UCREFRP Catalog Number
9556
Author
Bestgen, K. R., K. A. Zelasko and C. T. Wilcox.
Title
Non-native fish removal in the Green River, Lodore and Whirlpool canyons, 2002-2006, and fish community response to altered flow and temperature regimes, and non-native fish expansion.
USFW Year
2007.
USFW - Doc Type
115,
Copyright Material
NO
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able to obtain reliable information on the response of the fish community to flow and - <br />temperature effects, but only at the lower end of the flow spectrum and the high end of the <br />temperature spectrum. Flow and temperature conditions observed in 2002 to 2006 fell within the <br />bounds for recommendations that would be implemented in years with low or moderately low <br />water availability, which happen in only 30% of flow years. Average, moderately high, and high <br />flow years, which occur the other 70% of the time, were not evaluated because those conditions <br />were not realized during this study period. Additional years of sampling when those flow <br />conditions are available are needed to fully assess the combined effects ofnon-native fish <br />removals as well as flow and temperature recommendations for Flaming Gorge Dam on the lish <br />community of the Green River. <br />We recommend additional monitoring of water temperatures, flows, and the fish <br />community of the Green River in Browns Park, Lodore and Whirlpool canyons, and Island- <br />Rainbow Park. Comparisons of fish community response to different levels offish removal in <br />the study area (Green River up and downstream of the Yampa River) and flow and temperature <br />regimes from Flaming Gorge Dam may enhance understanding of factors that may limit invasive <br />species, particularly predators, and enhance native fishes. Care needs to be taken when <br />iinpleinenting these studies so that effects of fish removal and concurrent effects of flow and <br />temperature regimes from Flaming Gorge Dam on native fishes are not inextricably confounded <br />We offer some suggestions for that, perhaps including additional sampling in the lower Yampa <br />River. We also recommend PIT-tagging and scanning all chubs captured, including roundtail <br />chubs, and continued removal of predaceous and other non-native fishes from the study area. <br />viii <br />
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