Abstract
Ultrastructure of spermatozoa produced by artificially induced triploid Pacific oysters, Crassostrea gigas, was studied by transmission and scanning electron microscopy. Spermatozoa from triploids (3n sperm) resembled sperm from diploids (2n sperm) and consisted of an acrosome, nucleus, four mitochondria, and flagellum. The head, acrosome, and flagellum of 3n sperm were significantly ( P<0.05) larger than those of 2n sperm. The diameter of the mitochondria was not different between 3n and 2n sperm.
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