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19 creased rapidly with time. Mi~rohabitat variables Water depth ~tationary swimming. The change in location from pools dur- ing the winter to shallower water during the summer can be quan- tified for the two seasons (Table 1). All life stages of fish engaged in stationary swimming occupied significantly (P < 0.05) deeper water during the winter than in summer. For both species, juveniles inhabited significantly (P < 0.05) shallower water than adults in summer and significant- ly (P < 0.05) deeper water in winter while stationary swimming. This indicates a somewhat lower use by juveniles of mid-stream areas during summer and a greater percentage of juveniles than adults moving into pools during winter. Many adults were ob- served stationary swimming in the shall ower areas throughout the winter. Random s..-mming. Both species of juveniles were found in significantly (P < 0.05) greater water depths during winter than during summer. This again indicates the shifts from shallow water in summer to pools in winter. Adults of both species differed from juveniles for the ac- tivity of random swimming, and were found in deeper average water depths during summer than in winter. This difference between seasons was significant (P < 0.05) for adult rainbow trout but was not significant (P > 0.05) for adult cutthroat trout. Adults were very seldom observed in the activity of random swimming dur-