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Reproductive activities of many fish species are, to some extent, entrained to cues from the moon. During the spawning season, synchronous spawning is repeated at intervals of c. 1 month (lunar spawning cycle) and 2 weeks (semi‐lunar spawning cycle) or daily according to tidal changes (tidal spawning cycle). In species showing lunar‐related spawning cycles, oocytes in the ovary develop towards and...
Weekly changes in the gonadosomatic index (I G ) of male golden rabbitfish Siganus guttatus showed two peaks corresponding with the new moons in June and July. The testes developed synchronously toward the first lunar quarter in June and July. After the second spawning, the sperm duct and the seminiferous tubules were occupied by residual spermatozoa and spermatogonia, respectively. Weekly...
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