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•, 4 <br />-~ . <br />7. Sand Wash; the upper end of Desolation Canyon, approximately <br />. 30 miles downstream from Ouray. <br />8. Walker Wildlife Area; a flooded gravel pit and the adjacent <br />Colorado River near Grand Junction,%olorado. <br />Endangered fish were returned to the river unharmed if possible, <br />although a certain percentage of the fish died due to injuries suffered <br />in the trammel nets. ,Any dead humpback suckers or Colorado squawfish <br />were frozen and returned to Utah State University for enzyme studies. <br />Live fish were weighed and measured, key scales were removed, and they <br />were tagged with numbered flog anchor tags before being returned to . <br />the water. Selected individuals, preferably males, were tagged with <br />ultra-sonic transmitters to allow their movements to be monitored. <br />Flannelmouth and bluehead suckers were sacrificed to obtain sex, <br />maturity and fecundity information. Scales and lengths and weights were <br />also taken. This data will be worked up this winter along with the <br />humpback sucker and folorado squawfish information. Age structure, <br />year class strength, and growth will be correlated with water quality <br />and flow data collected by the U.S.G.S. at several sites in the study <br />area. Although U.S.G.S. was contracted by the Salt Lake Area Office <br />of the U.S. Fish and Wildlife Service to collect this data at the <br />mouth of the Yampa, the collections were made infrequently and have <br />now been terminated. This means that the Yampa flow information will <br />have to be pieced together by combining a station on a major tributary, <br />the Little Snake River, and a station above the tributary on-the Yampa <br />itself. <br />Temperature and turbidity were monitored at the collection sites <br />during each collecting period. <br />Sampling was initiated. for the year in early ,",Nril at Walker <br />