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Document number, size, spring chinook, time, and release location for fall chinook, and summer steelhead reared at Umatilla Hatchery and released into the Umatilla River. Monitor water quality parameters in an index series of Michigan and Oregon raceways in which fall and spring chinook are reared, and in a series of Michigan raceways in which summer steelhead are reared. Collect and compare monthly measurements of length, weight, and condition factors for fall and spring chinook reared in the Michigan and Oregon systems, and for summer steelhead reared in the Michigan system at Umatilla Hatchery. Calculate and compare growth rates for fall and spring chinook reared in the Michigan and Oregon systems, and for summer steelhead reared in the Michigan system at Umatilla Hatchery. Determine and compare fin condition, degree of descaling, degree of smolting, length, weight, and condition factor at release for fall and spring chinook reared in the Michigan and Oregon systems, and for summer steelhead reared in the Michigan system at Umatilla Hatchery. Compare the physiological stress response of fall and spring chinook salmon reared in Michigan and Oregon systems at Umatilla Hatchery. Compare the Na+K+ATPase activity of gill tissue from subyearling spring chinook salmon reared in Michigan and Oregon systems at Umatilla Hatchery.

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