Viabilities of Eggs Stripped from Coho Salmon at Various Times after Ovulation

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Abstract
Eggs of high viability were obtained from coho salmon (Oncorhynchus kisutch) stripped at various times after the detection of ovulation. In females treated with gonadotropin-releasing hormone analogue (LH-RHa) to induce precocious ovulation, average viabilities of eggs exceeded 70% in eight of nine spawning dates extending to 16 d after ovulation. Later in the season, average viabilities in eggs taken from untreated females exceeded 80% up to 20 d after ovulation. A discrepancy between mean and median values for egg viabilities suggested that average viabilities may have been disproportionately influenced by the incidence of very low viabilities in a few batches of eggs.