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Seasonal changes in the cytology of the pituitary gland and the ovary of the goldfish. Beach, Alan Winston


Goldfish ova begin rapid maturation in November. Maturation is completed in June and July. Seasonal cycles in mature and resorbing follicles were correlated with changes in basophil counts of the pituitary gland. Cytological evidence confirms the expected pituitary control of cyclic ovarian activity. Resorbing follicles are found all year but are more abundant during sexual maturity, and are particularly numerous in fish which failed to spawn. Goldfish injected with extracts of salmon pituitary for twelve days showed no cytological changes in the ovary. It is concluded that the granulosa is responsible for removal of resorbing ova and that these resorbing ova are the means of removing surplus eggs.

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