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Embryo survival and smolt to adult survival in second‐generation outbred coho salmon

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Outbreeding depression was not detectable in observations of embryonic survival and of survival of smolts to adulthood relative to controls in coho salmon Oncorhynchus kisutch experimentally outbred over two generations by crossing fish from three widely separated populations. Survival in outbred coho salmon was not detectably less than that in second‐generation hybrid controls or second‐generation parental controls. Variation of embryonic survival was affected by the maternal source population and by individual females but not by the paternal source population or by individual males. Survival of smolts to adulthood at sea was greater in one second‐generation control group than in two others, but survival in second‐generation outbred groups was no less than in parental controls or hybrid controls.

Keywords: Pacific salmon; hatchery effects; outbreeding depression

Document Type: Regular Paper


Affiliations: 1: School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Juneau Center, 11120 Glacier Highway, Juneau, AK 99801, U.S.A. and 2: National Marine Fisheries Service, Northwest Fisheries Science Center, Conservation Biology Division, 2725 Montlake Boulevard East, Seattle, WA 98112, U.S.A.

Publication date: December 1, 2004


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