Reproductive Cycle and Spawning of Modiolus philippinarum (Bivalvia : Mytilidae) in a Seagrass Bed in Kin Bay, Okinawa Island, Southern Japan

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  • 沖縄島金武湾の海草藻場におけるホソスジヒバリガイの繁殖周期と産卵

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The reproductive cycle and spawning of Modiolus philippinarum were studied in a seagrass bed in Kin Bay, Okinawa Island, southern Japan, based on histological observations of gonads throughout the year. Active gametogenesis occurred in the period from July to October, during which three peaks of spawning were observed at intervals of about 45 days. Drastic declines in water temperature driven by the passing of typhoons were observed several times in the same period. However, the peaks of spawning did not correspond to physical disturbances caused by the passing of typhoons, nor to any particular lunar phase.

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