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KMID : 0381920100400010001
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Korean Journal of Microscopy
2010 Volume.40 No. 1 p.1 ~ p.8
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The Spermatogenesis of Chinese minnow, Leuciscinae, Teleostei
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Kim Dong-Heui
Chang Byung-Soo
Kim Wan-Jong
Lee Myeong-Seon
Teng Yung-Chien
Kim Seok
Lee Kyu-Jae
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Abstract
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The ultrastructure of spermatogenesis and sperm in Chinese minnow, Rhynchocypris oxycephalus belonging to Leuciscinae was investigated by light and electron microscopes. The whitish testis was located between intestine and air bladder. The size of testis was major axis 2.3 cm, minor axis 6 mm. The testis contained numerous testicular cysts, and spermatogenesis was non-synchronized in these testicular cysts. In the case of spermatogonium, the nucleus was comparatively large ellipsoidal, and mitochondria showed a marked development. The size of primary spermatocyte was smaller than that of spermatogonia, and secondary spermatocyte was smaller than primary spermatocyte. The chromatin of spermatocyte was highly condensed according to their development. The nucleus with electron-dense was round shape. In spermiogenesis, flagella started to be formed and chromatin was more condensed. The mitochondria were rearranged in a middle piece. The sperm was formed by loss of cytoplasm. The head of mature sperm was a spherical shape and have not acrosome. The microtubules of flagella were arranged 9+2 structure. Also, the tail of sperm have not lateral fins.
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KEYWORD
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Spermatogenesis, Rhynchocypris oxycephalus, Leuciscinae, Fish
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