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An Ultrastructural Study on the Spermatogenesis of Xiphophorus maculatus  

Kim, Dong-Heui (Dept. of Basic Science and Institute of Basic Medical Science, Wonju College of Medicine, Yonsei University)
Reu, Dong-Suck (Dept. of Biology, Chongju University)
Deung, Young-Kun (Dept. of Basic Science and Institute of Basic Medical Science, Wonju College of Medicine, Yonsei University)
Publication Information
Applied Microscopy / v.33, no.4, 2003 , pp. 267-274 More about this Journal
Abstract
The ultrastructures of spermatogenesis and sperm in Xiphophorus maculatus, ovoviviparous fish were investigated by electronmicroscopy The testis of Xiphophorus maculatus contained numerous testicular sacs, and spermatogenesis was synchronized in these testicular sac. In the case of spermatogonium, the nucleus was comparatively large ellipsoidal, and the nucleolus and mitochondria showed a marked development. The size of primary spermatocyte was smaller than that of spermatogonia, and that of secondary spermatocyte was smaller than that of 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 along the tail. The sperm was formed by loss of cytoplasm. The head of mature sperm was long cone shape and had not acrosome. The microtubules of flagella were arranged 9+2 structure. Also, the sperm has a loop-like structure at the end of a tail.
Keywords
Fish; Spermatogenesis; Ultrastructure; Xiphophorus maculatus;
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