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The Oogenesis of Chinese minnow, Leuciscinae, Teleostei  

Kim, Dong-Heui (Department of Environmental Medical Biology, Institute of Basic Medical Science, Wonju College of Medicine, Yonsei University)
Chang, Byung-Soo (Department of Cosmetology, Hanseo University)
Jung, Han-Suk (Department of Chiropractic Rehabilitation, Graduate School of Health Promotion, Hanseo University)
Teng, Yung-Chien (Department of Environmental Medical Biology, Institute of Basic Medical Science, Wonju College of Medicine, Yonsei University)
Kim, Seok (Department of Environmental Medical Biology, Central Research Laboratory, Wonju College of Medicine, Yonsei University)
Lee, Kyu-Jae (Department of Environmental Medical Biology, Institute of Basic Medical Science, Wonju College of Medicine, Yonsei University)
Publication Information
Applied Microscopy / v.39, no.3, 2009 , pp. 237-243 More about this Journal
Abstract
Chinese minnow, Rhynchocypris oxycephalus is a teleost belonging to Leuciscinae, Cyprinidae. The oogenesis and ultrastructure of egg envelope in Chinese minnow were investigated by light and electron microscopes. The ovary was of white yellowish and ellipsoidal shape with the major axis 30 mm and the minor axis 7mm. Cytoplasm of oogonia was basophilic and many nucleoli were located at inside of nuclear membrane. In primary oocytes, yolk vesicles were distributed only in the marginal area and egg envelope was not formed on the outside of an egg. In secondary oocytes, the egg envelope was formed and yolk vesicles in the cytoplasm were increased than the earlier stage. The basophilic substance of cytoplasm was changed to acidic. In case of matured egg, thickness of egg envelope and size of egg were increased. The yolk vesicles were changed to yolk mass in accordance with development. The outer surface of egg envelope was covered by microvilli-structures, and had a micropyle on the area of animal pole. Egg envelope consisted with 2 layers, an adhesive outer layer with microvilli-structures and fibrillar inner layer. In conclusion, the oogenesis of Chinese minnow was characterized by the increase in cell size, the formation and accumulation of yolk, and the decrease of basophilic substance in the cytoplasm. The oogenesis of Chinese minnow seems to share common patterns in Cyprinidae, but these ultrastructural unique characters of egg envelope can be utilized in taxonomy of teleost.
Keywords
Chinese minnow; Oogenesis; Leuciscinae; Egg envelope;
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Times Cited By KSCI : 4  (Citation Analysis)
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