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<br />28 <br /> <br />UTAII ACADEMY PROCEEDINGS, VOL. SO, P.\RT I, 1973 <br /> <br />Postimpoundment Fish Distribution <br /> <br />Major findings of the Utah Coop Fishery Unit studies of 1963-66 were <br />. as follows: Since the closure of the Flaming Gorge D;1m in 1962 the <br />environment of the Green River has changed significantly from the dam to <br />the mouth of the Yampa River, 65 miles downstream. Seasonal fluctua- <br />tions in flow are reduced, daily fluctuations are increased, water tempera- <br />tures are lower in sununer and higher in winter, and turbidity is greatly <br />reduced. The Yampa River has retained its characteristics and moderates <br />the changes in the Green River such that all species of fish present before <br />impoundment are still present in the Green River below the mouth of the <br />Yampa. Of the seven indigenous species under consideration and in the <br />study area in preimpoundment times only the tlannelmouth sucker, blue- <br />head sucker, and the roundtail chub were found above the mouth of the <br />Yampa River and nOlle of the native species are known to have reproduced <br />in this area. Growth rates of the Colorado squaw fish and the round tail and <br /> <br /> <br />WYOMING <br /> <br />NEVADA <br /> <br />UTAH <br /> <br />COLORADO <br /> <br />ARIZONA <br /> <br />NEW MEXICO <br /> <br />Fiaure I. Map of the Green River system showing collection sites. <br /> <br /> <br />/' <br />~ -",...~ <br /> <br />'\. <br /> <br />'; <br />I <br /> <br /> <br />\ <br /> <br /> <br />,........"'. <br /> <br />