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and F (Student's T; p < 0.1), Stratum G and the Duchesne River (p < 0.2). <br />However, Strata D, F, and F should be considered potential juvenile <br />concentration areas because average catch rates are close to minimum UCRBCC <br />criteria and sample variability is high. <br />The sensitive areas concept was further evaluated by comparing other <br />seasonal data with spring sampling because spring results may represent unique <br />conditions. Accordingly, spring electrofishing data were compared with <br />results of the SSP for Green, White, and Yampa rivers (May-October 1979-1981) <br />(Miller et al. 1982a,b, Tyus et al. 1982b). Both data bases indicated that <br />adult Colorado squawfish utilized the upper reaches of mainstem Green and <br />tributaries (Yampa, White, and Duchesne rivers), while juveniles and young <br />were more common in the lower reaches of the Green River mainstem. <br />Two large adult Colorado squawfish were collected in spring 1983 with <br />channel catfish lodged in their throats. This phenomenon is being studied <br />further because of its possible implications. However, since the event <br />occurred in only two of 419 Colorado squawfish collected in the spring (less <br />than 0.5%), the impact is thought to 6e small (Pimental et al. 1985). It <br />should be noted that both events in 1983 and one in 1982 occurred in Stratum <br />C, a stratum having a very low adult catch rate (0.48 fish/h r). The known <br />lack of interest of Colorado squawfish for channel catfish as prey (Pimentel <br />et al. 1985) might indicate that food for the adult Colorado squawfish is <br />limiting in Stratum C, where channel catfish are abundant. McAda (1983) and <br />Wick et al. (1965) also reported Colorado squawfish choking on channel <br />catfish. <br />26 <br />