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43 <br />Pucherelli and Clark (1989) reported the influence of flow. at Flaming <br />Gorge Dam on backwater habitat availability to decrease with' distance <br />from the dam. Island park and Jensen, Utah (84 and 110 miles below <br />the dam respectively), exibition considerable variation in backwater <br />availability with changes in discharge. The reach from 200 to 280 miles <br />below the dam, which includes Ouray and Sand Wash, Utah, showed no <br />changes in backwater area with flow changes from 1889 cfs to 4359 cfs, <br />as measured at the U.S. Geological Survey gage, Jensen, Utah, using <br />aerial photo comparision techniques. <br />Razorback sucker. <br />o Dispersal of razorback sucker larvae from spawning sites, downstream to <br />backwater nursery habitat is probably dependent on some critical flow level <br />below which dispersal may be impeded. <br />Paulin et al. (1990) reported laboratory results indicating larval drift to be <br />associated with higher velocities. <br />Valdez et al. (1986) hypothesized that larval drift may be an important <br />feeding mechanism for native fishes of the Colorado River Basin. Larvae <br />of the native species are moved downstream if current velocities are <br />great enough since fins, fin rays, and musculature are not fully <br />developed. <br />0