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The reservoir basin is approximately eight km long, extending from the dam (RK 167) up to just below the Deserado Mine bridge (RK 175.5). River kilometer figures were obtained by converting from river miles mapped by the RIP. RK 0 is the White River/Green River confluence. In a White River fish study conducted in 1980-1981 prior to Kenney Reservoir, Miller et al. (1982) found 15 fish species of which seven were native and eight nonnative. Chart (1987) found seven native and seven nonnative fish species in the vicinity of Kenney Reservoir during the reservoir construction and filling period of 1983-1985. Martinez et al. (1994) reported an increased abundance of introduced fish species in, above, and below the reservoir area after the reservoir project was completed. Trammell (1991) found 19 species of fish in Kenney Reservoir and the White River upsteam and downstream of the reservoir (Table A-1). Seven of these species were native to the White River while the rest were nonnative. METHODS Three sampling gear types were used to sample fish populations in the three study reaches. Seining was the main gear used in the river reaches. A trammel net and electrofishing were also used at one large backwater in the lower river reach. The reservoir was sampled using electrofishing, trammel and gill nets, and seines. At all areas electrofishing was conducted using a flat-bottomed aluminum boat equipped with two boom mounted spherical anodes in front, two sets of trailing negative cathodes, a 5,000 watt portable Honda generator and a Coffelt WP-15 variable voltage pulsator. Seining was conducted with a 5 m x 1.2 m x 3.2 mm ace mesh (150 ft x 4 ft x i/a inch) seine. Trammel nets were 50' m x 1.2 m x 25 mm (1 inch) mesh with 305 mm (12 inch) mesh outer panels. Gill nets were 50 m x 1.2 m experimental type, having six different mesh panels ranging from 12.7 mm (0.5 inch) to 51 mm (2 inches). All backwaters in the upper and lower river reaches were sampled by seining. Seining was the most effective technique used by Trammell et al. (1993) for collecting stocked Colorado squawfish in the river. The sampling procedure was for a two or three person crew to float downstream in a canoe and seine each backwater as it was encountered. One to three non-overlapping seine hauls were made in each backwater to cover 30-500 of the area. All catches were examined on the bank for Colorado squawfish. Other fish species were returned alive to the water without being recorded. No attempt was made to identify all fishes captured by seining since this had been done during previous studies, and would have required killing and preserving large numbers of fish for later identification in the laboratory. 5