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I I I I I I I I I I I I , I I I I J I 33 Our findings that exotic species, especially red shiners, dominate the fish collections were similar to those of Holden (1977) and Holden and Crist (1978). The capture of young-of-the-year fish indicated that 5 of the 8 native species and 4 of the 10 exotic species collected in the study area reproduced successfully in 1979. This also conforms to earlier studies that have shown that most exotic species do not find the Green River favorable habitat for reproduction (Holden and Stalnaker 1975). The habitat use data collected for most adult fishes in the study area indicates a preference for. slow current or protected areas during early spring, and high water. There appears to be an increased utili- zation of the main current during late summer when the river recedes. These data reflect the habitat preferences of the large number of carp recorded. However, they also indicate that during cold seasons, and high spring flows, calmer areas may be sought. \4hen the river becomes more hospitable in summer and fall, more of the main channel is utilized. This general pattern has been noted in other Green River studies by the senior author, although year-round habitat specific data is lacking to support this observation. The habitat preferences of adult squawfish, utilizing runs during low flows and backwaters during high flows, is similar to those noted by Holden (1977) and Holden and Selby (1978). The preference for slow areas by young fishes is typical of river situations. Some species, such as the suckers, appear to move out of backwaters. into runs and eddies within a few months of hatching.