Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Gametogenic Cycle and Fine Structure of Ripe Germ Cells in the Pacific Oyster, Crassostrea gigas on the South Coast of Korea

  • Choi Youn Hee (Department of Aquaculture, Pukyong National University) ;
  • Kim Tae Ik (Namhae Marine Hatchery, National Fisheries Research and Development Institute) ;
  • Hur Young Baek (Namhae Marine Hatchery, National Fisheries Research and Development Institute) ;
  • Go Chang-Soon (Namhae Marine Hatchery, National Fisheries Research and Development Institue) ;
  • Chang Young Jin (Department of Aquatic Life Medicine, Pukyong National University)
  • Published : 2003.06.01
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Abstract

The gonadal development and the gametogenic cycle and the fine structure of ripe germ cells of the cultured Pacific oyster, Crassostrea gigas were investigated using oysters monthly collected from the southern coast of Korea from October 2000 to September 2001. Monthly changes in the condition index were similar to that of meat weight rate and the highest value was observed in between April and May, and the lowest value in August. The external colors of the testis and the ovary were milky white and yellowish, respectively. The spawning period of the Pacific oyster was continued from May to September, with a peak in July. The gametogenic cycle could be classified into five successive stages: multiplicative stage (December to March), growing stage (March and April), mature stage (April to June), spawning stage (June to August) and resting stage (August to January). Variety of egg yolk granules, lipid granules, mitochondria, and endoplasmic reticula were observed in cytoplasm of ripe oocyte. The spermatozoon consisted of the head, middle piece and tail; including cap-shaped acrosome with domed structure, elliptical shaped nucleus, four mitochondria, two centrioles and flagellum.

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References

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