Abstract
The reproductive cycle of two populations of Pacific oyster, Crassostrea gigas, represented by early and late set oysters from a single breeding season, are compared. Similar trends of gonadal development, as indicated by follicular and maturity indexes, have been observed in both: the early set oysters become fully ripe and spawn about a month earlier than the late set; the latter, however, take a month longer to spawn out fully. Gametogenesis has been analysed in different young-of-the-year classes and the results show sexual differentiation at 6 months and spawning within the first year. The oyster has a long spawning season, from mid-spring to the end of summer and the pattern of spat settlement reflects the extended spawning activity.
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