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<br />vi <br /> <br />Both species of fish were grouped by length into two life <br />stages: juvenile and adlalt. The primary physical activities for <br /> <br />both cutthroat and rainbow trout were stationary and random swim- <br /> <br />. tionary position by actively swimming against a current. <br /> <br />ming. Stationary swimming was defined as fish maintaining a sta- <br /> <br />swimming was defined as swimming without orientation toward a <br /> <br />Random <br /> <br />current that did not produce a net change in general location. <br /> <br />Interstitial activity was observed in rare instances. This ac- <br /> <br />tivity was defined as fish using the interstitial crevices <br /> <br />between rocks while random swimming. When fish were observed <br /> <br />feeding during any of the activities, this was also recorded. <br /> <br />Vegetative COver was measured in the intensive study site <br /> <br />-;:: <br /> <br />using the same transects established for the IFG-4 hydraulic <br /> <br />model. A diver traveled along the transect line and transmitted <br /> <br />to surface personnel data on substrate type, plant species, per- <br /> <br />cent of plant Cover, water depth, and distance along the cross <br /> <br />bed along the cross section. <br />. <br /> <br />sections. Measurements of water velocity were made at each plant <br /> <br />Benthic samples were collected in the intensive study site <br /> <br />barren sil t, macrophyte beds on s11 t, gravel, rubbl ~, and rock <br /> <br />to determine invertebrate densities for five substrate types: <br /> <br />with Cladophora attached. Samples were collected at depths rang- <br />ing from 1.4 to 5.8 m by a diver using a special enclosed <br /> <br />sampler. <br />