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8/11/2009 11:32:56 AM
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UCREFRP
UCREFRP Catalog Number
7743
Author
Miller, A. S. and W. A. Hubert.
Title
Compendium of Existing Knowledge for Use in Making Habitat Management Recommendations for the Upper Colorado River Basin.
USFW Year
1990.
USFW - Doc Type
\
Copyright Material
NO
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40 <br />• U.S. Fish and Wildlife Service (1987b) reported summer flow and <br />Colorado squawfish recruitment to be related. <br />o Unnaturally high late summer flows are detrimental to survival of Colorado <br />squawfish larvae. Such flows are often the result of dam re-regulation <br />practices where peak spring flows are redistributed to late summer and fall. <br />Jones and Tyus (1985a, b) reported elevated flows during the primary <br />Colorado squawfish nursery period (August-September) to be <br />detrimental to their survival. Regression analysis of larval catch per effort <br />on mean daily discharge in August and September resulted in an r value <br />of -0.89 (p=0.05). Mean daily discharge explained 80 percent of the <br />variation in catch per unit effort. They speculated an inverse relationship <br />• exists between discharge and availability of backwaters suitable for <br />Colorado squawfish larvae. Their observation that less area of low or <br />zero velocity water within backwaters exists at high flows than low flows <br />supports the idea. <br />Archer et al. (1986) reported that all backwaters observed in the Green <br />River at 800 cfs were transformed to moving waters at 4000 cfs. They <br />reported a correlation between high late summer-fall discharges and <br />decreased recruitment of Colorado squawfish. <br />o A balance between unnaturally high late summer flows and very low flows may <br />be necessary to transport Colorado squawfish larvae to downstream reaches <br />with large amounts of rearing habitat. <br />0
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