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To assess the role of the pineal gland in the regulation of ovarian activity, female catfish were exposed to various combinations of photoperiods during the postspawning period of the annual reproductive cycle. Ovarian recrudescence and vitellogenin synthesis were accelerated after pinealectomy in catfish maintained under short photoperiod (9L : 15D) at 25 °C. However, at 25 °C, under long (14L : 10D), equal (12L : 12D), very short (6L : 18D) photoperiods, or under continuous light (LL or 24 h light) or continuous darkness (DD or 24 h darkness), pinealectomy delayed ovarian recrudescence and suppressed vitellogenin synthesis. These results suggest that the pineal gland in catfish

reproduction nutrition development/annales de biologie animale, biochimie, biophysique/reproduction nutrition développement

Pinealectomy, ovarian activity and vitellogenin levels in the catfish, Heteropneustes fossilis (Bloch), exposed to various combinations of photoperiods