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area was expanded downstream to the Utah state line when some fish could not <br />be located in the immediate study area (Fig. 1). Radio-tracking was <br />conducted from boats; however, in one location, searches from shore were <br />necessary because of inaccessability by boat. Locations of fish were <br />identified in the Colorado River by river mile (RM) distance from the <br />confluence with the Green River, and in the Gunnison River as distance from <br />its confluence with the Colorado River. <br />Distribution of larval squawfish was determined by seining river backwaters <br />from mid July through the end of August. The river was subdivided into 2- <br />mile reaches; in each reach, the first backwater encountered (when <br />- proceeding downstream) was sampled using 0.5-mm-mesh hand seines. Captured <br />fish were preserved in 10% formalin and identified by the Colorado State <br />University Larval Fish Laboratory. Sampling effort was not constant among <br />samples so results are considered qualitative. The area sampled included the <br />aforementioned 15-mile reach, the adjacent 18-mile segment of Colorado River <br /> <br />Black <br />Rocks <br />I <br />UTAH COLORADO <br />Loma <br />Boat Fruila <br />Launch <br />RM 152.8 \\ <br />COLORADO <br />RIVER <br />RM 171.0 <br />Redlands <br />0 5 10 Diversion <br />Scale of Mlles <br /> Government <br /> Highllne <br /> Diversion <br />Grand <br />N <br />Junction I <br />Palisade <br />Price <br />Clift <br />on ? <br />\ \ <br />\ Dam <br /> Grand <br />\ Valley <br /> Diversion <br /> RM 185.1 <br />GUNNISON <br />RIVER <br />Figure 1. Map of the general study area. <br />3