Abstract
Abstract The most effective compounds tested in vitro for inducing maturation of oocytes from one coho salmon Oncorhynchus kisutch in fresh water were partly purified salmon gonadotropin and 17α-hydroxy-20-β-dihydroprogesterone (17α,20β-dihydroxy-4-pregnen-3-one). The steroid, 20β-hydroxyprogester-one (20β-hydroxy-4-pregnen-3-one), was less effective, and progesterone, cortisol, and cortisone were relatively ineffective. With one fish retained in seawater during final maturation, 17α-hydroxyproges-terone was only slightly effective in inducing germinal vesicle breakdown in oocytes. Oocyte maturation was not induced by any other treatment of the other fish tested from seawater.
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