Precocious Induction of Oocyte Maturation and Ovulation in Coho Salmon, Oncorhynchus kisutch

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Abstract
Coho salmon (Oncorhynchus kisutch) were induced to ovulate 3–5 wk ahead of the normal time using partially purified salmon gonadotropin (SG-G100) alone or in combination with 17αhydroxy 20β dihydroprogesterone (17α-20βP). Treatment with 17α-20βP alone induced final oocyte maturation but not ovulation and was associated with a negative feedback upon endogenous gonadotropin. The most successful treatments consisted of a "priming" injection of 0.1 mg/kg SG-G100 followed within 2–3 d by an injection of either 1 mg/kg SG-G100 or 3 mg/kg 17α-20βP. Ova from the ovulated fish were successfully fertilized. This is the first occasion in which the time of spawning has been controlled in adult migrant Pacific salmon. Key words: coho salmon, Oncorhynchus kisutch, induced ovulation, final maturation, SG-G100, gonadotropin, 17α-20β dihydroprogesterone

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