Abstract
Abstract The sequence of hormonal events controlling reproduction in female rainbow trout began at least 1 year before the first ovulation. Significant increases in plasma levels of gonadotrophin, vitellogenin, 17β-oestradiol and testosterone occurred during February in trout that ovulated the following January. These hormonal indicators of reproductive activity were accompanied by changes in the appearance of the ovary. Endogenous vitellogenesis (the autosynthetic formation of yolk vesicles) had already begun in January, a full year before ovulation. Exogenous vitellogenesis (the ovarian uptake of hepatically-derived vitellogenin) began in March, 10 months before ovulation.
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