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Aspects of special relevance to fishery science and commercial and experimental cultivation are discussed. These include changes in batch fecundity and egg size as the spawning season progresses; the timing and methodology of fecundity estimations; ovulatory/spawning rhythms; the effect of temperature on the ageing rate of retained ovulated oocytes and the interovulatory period; ovulation prediction in hand-stripped broodstocks to facilitate the collection of good quality, freshly ovulated eggs, and the effect of maternal stress on the ovulatory/spawning rhythm. 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