Korean Journal of Animal Reproduction (한국가축번식학회지)
- Volume 21 Issue 3
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- Pages.311-319
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- 1997
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- 1226-5284(pISSN)
Ultrastructures of Sperm, Gonadal Sex Differentiation in Chum Salmon(Oncorhynchus keta)
연어(Oncorhynchus keta) 정자의 미세구조와 성분화
Abstract
This study was carried out to investigate the ultrastructural changes of spermatozoa obtained from 20 of 3-year-old male chum salmon(Oncorhynchus keta) collected and analysed in middle October in 1995. The ultrastructural changes of gonad of fingerlings were examined to describe the sex differentiation of this species. The results obtained in this study were as follows : In spermatozoa, the nucleus is dense and homogeneous. Two spheroidal mitochondria(about 350nm long) are situated in parallel between the nucleus and the axoneme. Spermatozoa mitochondria are assembled into an organized sheath surrounding the outer dense fibres and axoneme of the flagellar midpiece. The sheath flagellum is situated beneath the base of the sperm head. The primordial germ cells of 6.8~7.2
Keywords
- Chum salmon;
- Ultrastructures;
- Gonadal sex differentiation;
- Primordial germ cells;
- Drumstick body;
- Barr body;
- Mitochondria;
- Transmission electron microscope