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Snake River fall chinook salmon brood-stock program (1981-1986) : final report of research
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1987
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Alternative Title:Snake River fall chinook salmon broodstock program : final report 1986
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Description:The objective of the Snake River Fall Chinook Salmon Brood-stock Program was to hatch eggs from upriver stocks, rear the fish to spawning maturity, and use the resulting eggs for stock restoration in the Snake River. Approximately 15,000 eyed Snake River fall chinook salmon eggs were obtained each winter in 1981, 1982, 1983, and 1984 from various Columbia River hatcheries. Fish from these eggs were reared in dechlorinated City of Seattle water at the Northwest and Alaska Fisheries Center or in constant 10.5°C groundwater at the University of Washington's Big Beef Creek Research Station. Seawater tolerance trials of 0+ age (3-5 months) juveniles in all four brood stocks were strongly suggestive of the 1+ age smoltification pattern of spring chinook salmon. Attempts to transfer 0+ age fish to marine net-pens at the Manchester Marine Experimental Station were unsuccessful during the four brood years. The only Snake River fall chinook salmon that demonstrated acceptable survival after 4 months residence in seawater were fish that were transferred as 1+ age smolts. After smolts were successfully transferred to seawater, losses were minimal for several months. However, in all Snake River chinook salmon stocks, mortality due to bacterial kidney disease (BKD) and a previously undescribed "rosette disease" resulted in very few maturing fish at 4 or 5 years of age. Results of this experimental program indicate that at this time the rearing of Snake River chinook salmon to maturity in marine net-pens would not lead to a viable egg-bank program.
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Rights Information:CC0 Public Domain
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Compliance:Library
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