Coho Salmon

Coho salmon

Jessica Miller, Kathleen O'Malley, Carl Schreck

Latin name: Oncorhynchus kisutch

Taxonomic analysis of Northwest populations revealed stock structuring in coho salmon. This provided the first such groupings that are now part of the Endangered Species Act listing and recovery process. Other work concerning commercial aquaculture of this species developed methods for the induction of spawning hatchery broodstock by hormonal injection. This procedure is still the method of choice. Studies directed at enhancing survival of hatchery coho salmon following release was done in collaboration with the US Fish and Wildlife Service and demonstrated the importance of hatchery water flow rates in addition to space needs of the fish; this has led to the development of hatchery rearing protocols still in use today. Other studies demonstrated how coho could be conditioned to stress as a means of enhancing survival of hatchery fish.

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Hjort, R.C., and C.B. Schreck. 1982. Phenotypic differences among stocks of hatchery and wild coho salmon (Oncorhynchus kisutch) in Oregon, Washington, and California. Fisheries Bulletin 80:105-119.

Sower, S.A., and C.B. Schreck. 1982. Steroid and thyroid hormones during sexual maturation of coho salmon (Oncorhynchus kisutch) in seawater or fresh water. General and Comparative Endocrinology 47:42-53.

Sower, S.A., C.B. Schreck, and E.M. Donaldson. 1982. Hormone induced ovulation of coho salmon (Oncorhynchus kisutch) held in seawater and fresh water. Canadian Journal Fisheries and Aquatic Sciences 39:627-632.

Fitzpatrick, M.S., B.K. Suzumoto, C.B. Schreck, and D. Oberbillig. 1984. Luteinizing hormone-releasing hormone analogue induces precocious ovulation in adult coho salmon (Oncorhynchus kisutch). Aquaculture 43:67-73.

Patino, R., C.B. Schreck, J.L. Banks, and W.S. Zaugg. 1986. Effects of rearing conditions on the developmental physiology of smolting of coho salmon. Transactions American Fisheries Society 115:828-837.

Schreck, C.B., L. Jonsson, G. Feist, and P. Reno. 1995. Conditioning improves performance of juvenile chinook salmon, Oncorhynchus tshawytscha, to transportation stress. Aquaculture 135:99-110.