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Sperm entry in oyster crassostrea gigas oocytes

, : Sperm entry in oyster crassostrea gigas oocytes. Bulletin of the Marine Biological Station of Asamushi 18(1): 25-34

Sperm entry in the polyspermic oocytes of the oyster, Crassostrea gigas, was observed with scanning and transmission electron microscopes. The oocytes were inseminated in sea water containing 0.0075 M procaine. The sperm underwent acrosome reaction on the surface of the chorion and bound to it by an electron-dense material derived from the acrosomal vesicle. The acrosomal process elongated from the subacrosomal region penetrated into the chorion. The apical part of the acrosomal process passed through the chorion. It penetrated into the oocyte cortex and then seemed to fuse with the oolemma. Oocyte cytoplasm surrounding the acrosomal process protruded and developed into a small fertilization cone. The sperm head passed through the chorion with the absorption of the fertilization cone. The sperm entered the oocyte cortex within 5 min after insemination.

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