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<br />~ ,l <br /> <br />\ <br /> <br />. <br /> <br />. <br /> <br />19 <br /> <br />genetic integrity through hybridization with roundtail chub in the mainstem <br />Green and Colorado River. The tributaries may therefore provide very <br />important habitat in maintaining isolation during the spawning period. <br /> <br />Roundtail chubs spawn in June and July in the mainstem Colorado River when <br />flows are descending and water temperature ranges from 12-170 C (Archer et al <br />1985). Successful spawning and recruitment of young fish to the population is <br />often a major factor in a species survival in manipulated water systems. <br />Depletions in Cottonwood and Huntington Creeks and the Price River resulting <br />from implementing this project will be greatest in June and July. Percent <br />changes in flow range from 7.7 in June in the Huntington Creek to -49.2 in <br />July in the Price River. Flows in Ferron Creek will be reduced more than 50 <br />percent five months out of the year including 52.3 percent in July. The San <br />Rafael River will experience flow reductions of 18.6 and 38.6 percent in June <br />and July, respectively. These flow reductions are significant, occur at a <br />very crit i ca 1 time in the roundtai 1 chub 1 ife cyc 1 e and wi 11 resu It in seri ous <br />adverse impacts to the species. Tables VIII-XII illustrate changes in flow <br />for the five streams resulting from implementation of the project. <br /> <br />'-\ . ,.. ,,-., " <br />L 'J' . t' -< <br />" l.'. ~;;" <br />