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282 GREAT BASIN NATURALIST Vol. 45, No. 2 <br />WYOMING laming orge <br />Reservoir______ <br />----------- - <br />UTAH LITTLE SNAKE <br />1 RIVER <br />DUCHESNE ; <br />IVER YAMPA RIVER <br />N <br />WHITE RIVER <br />GREEN <br />RIVER :COLORADO <br />RIVER <br />2 <br />GUNNISON <br />3 RIVER <br />DOLORES <br />RIVER <br />0 25 50 COLORADO <br />KILOMETERS <br />Lake Powell <br />Fig. 1. Locations of sampling points in the Upper Colorado River Basin. (1) Confluence of the Yampa and Green <br />rivers; (2) Colorado River below the mouth of the Gunnison River; and (3) lower Gunnison River. <br />empirical constants derived using multiple <br />regression analysis. Length-weight relation- <br />ships were estimated using the equation Log <br />W = bl Log TL - bo (Tesch 1971), where W <br />is body weight (g) and b, and bl are empirical <br />constants derived using least-squares analysis. <br />Fish were dissected to determine sex and <br />stage of sexual maturity. Females were con- <br />sidered mature when ovaries contained large, <br />opaque, yellow ova; males were considered <br />mature when the testes were enlarged and <br />white. Fish were considered ripe when sex <br />products were expressed with light pressure <br />on the abdomen. Ovaries from mature fe- <br />males collected between April and June 1975 <br />and 1976 were used to estimate fecundity. <br />Fecundity was estimated gravimetrically in <br />the laboratory, where about 10% of each ova- <br />ry was weighed to the nearest 0.1 g and the <br />individual mature ova from this subsample <br /> <br /> <br />A