The present experiment was undertaken to investigate the seasonal variations of levels of prostaglandins (PGs) and regulation of these levels in the ovary and hemolymph of the scallop. The levels of prostaglandin F2α (PGF2α) and prostaglandin E2 (PGE2) in the hemolymph and ovary increased during sexual maturation, and these spawning season. Consecutive administration of antiestrogen inhibited the increase of the levels of PGF2α and PGE2 during sexual maturation. These results indicate that the seasonal variations of the levels of PGF2α and PGE2 are closely related to the reproductive cycle, suggesting that PGF2α and PGE2 may be involved in the sexual maturation and spawning of the scallop. Furthermore, it was supposed that estrogen likely plays a role in the regulation of PGs production in female well known in mammals.
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