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The key to explaining the observed differences appeared to be available habitat. The streams studied by Hunter (1973) in Washington were small with discharges from 2 to 30 cfs, much lower than those of Sheep Creek (55 cfs) or the Green River (850 cfs). It would seem unlikely that the high current velocities found in Sheep Creek and the Green River, as well as the abundant deep water of the Green River, were available in Hunter's (1973) study streams. This would explain the lower optimum and maximum values of the IFG kokanee spawning curves for current velocity and water depth. The ability ofkokanee to tolerate velocities up to 3.9 ftlsec may be due in part to their relatively large size. Kokanee from Flaming Gorge Reservoir were large when compared to other populations (Wengert 1985). Mean lengths of females in Sheep Creek and the Green River in 1985 were 16.2 (412 mm) and 16.0 inches (405 mm), respectively. Some of the variability between the two streams may also be genetic. The Sheep Creek kokanee are a brilliant red-orange with an olive colored head similar to the Kootenay Lake, British Columbia, strain (Anonymous 1970). The Green River kokanee have a darker black-red body with an olive head similar to the Whatcom Lake, Washington, strain (Anonymous 1970). ACKNOWLEDGMENTS This project was funded by the Wyoming Game and Fish Department. Thanks are expressed to Wyoming Game and Fish biologists Dave Dufek, Bill Wengert and Kevin Johnson, and Utah Division of Wildlife Resources biologists Steve Brayton and Roger Schneidervin. Excellent field assistance was provided by Brent Rhodine and Andrea Orabona. LITERA TORE CITED Anonymous. 1970. An evaluation of three kokanee races in Oregon lakes. Oregon State Game Commission, Federal Aid in Fisheries Project Completion Report Project No:F-71-R-6. 24 pp. Bayha, K. 1978. Instream flow methologies for regional and national assessments. FWS/OBS-78/61, U.S. Fish and Wildlife Service, Fort Collins, Colorado, USA. Bovee, K.D. 1978. Probability-of-use criteria for the family Salmonidae. FWS/OBS- 78/07, U.S. Fish and Wildlife Service, Fort Collins, Colorado, USA. Bovee, K.D. 1982. A guide to stream habitat analysis using the instream flow incremental methodology. FWS/OBS-82/26, U.S. Fish and Wildlife Service, Fort Collins, Colorado, USA. Bovee, K.D. and T. Cochnauer. 1977. Development and evaluation of weighted criteria probability-of-use curves for instream flow assessments: fisheries. FWS/OBS-77/63~ U.S. Fish and Wildlife Service, Fort Collins, Colorado, USA. Hunter, J.W. 1973. A discussion of game fish in the state of Washington as related to water requirements. Washington Department of Game. 66 pp. 32