Larval rearing and spat production of edible oyster Crassostrea gryphoides (Schlotheim)

The edible oyster Crassostrea gryphoides was induced to spawn in the laboratory by thermal stimulation, and the larvae were reared to spat. The larvae grow through the straight hinge (70×60.5 μm), early umbo (96.25×87.5 μm), late umbo (215×152.5 μm), eyed stage (290×222.5 μm) and pediveliger (308.25×254.17 μm) in pelagic phase before metamorphosing to spat, and these stages are described. These stages were reached at 20 h, on the fifth, 11th, 15th, 19th and 21st day respectively. Spat settlement percentage was found to be 1.8%.