Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Plasma Sex Steroid Hormone Profiles and Testicular Development in Artificially Maturing Cultured Mille Eel, Anguilla japonica

양식산 수컷 뱀장어 Anguilla japonica의 인위적 성숙유도에 따른 혈중 성호르몬 변동과 정소 발달

  • 김응오 (국립수산과학원 내수면양식연구소) ;
  • 배준영 (수산생명과학본부 양식연구팀) ;
  • 임상구 (국립수산과학원 내수면양식연구소) ;
  • 손맹현 (수산생명과학본부 양식연구팀) ;
  • 박민우 (수산생명과학본부 양식연구팀) ;
  • 박미선 (수산생명과학본부 양식연구팀) ;
  • 조용철 (국립수산과학원 내수면양식연구소) ;
  • 김대중 (수산생명과학본부 양식연구팀)
  • Published : 2006.12.31
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Abstract

We investigated the changes in body weight (BW), plasma sex steroid hormone profiles, and testicular development of cultured male eel Anguilla japonica during an artificial maturation process. Eels that received weekly intraperitoneal injections of eel's ringer solution containing human chronic gonadotropin (HCG) were examined. In the ringer-treated control, BW changes decreased slowly during the experimental period. Plasma testosterone (T), 11-ketotestosterone (11-KT) and $17{\alpha},\;20{\beta}$-dihydroxy-4-pregnen-3-one (DHP) levels In the control remained low and did not show significant changes. Moreover, all germ cells in the testes of the control were spermatogonia. In the HCG-treated male eels, however, BW changes increased gradually from the fifth week and then decreased slowly. The plasma T level increased rapidly (p<0.05) in the second week and then decreased slowly. The plasma 11-KT level increased dramatically (p<0.05) in the second week and was maintained until the end of the experiment. The plasma DHP level increased progressively from the second week and peaked in the eighth week (p<0.05). The testes of HCG-treated male eels were more developed than those of the control; most were at the spermatozoa and spermatid stages and showed active spermiation. Thus, spermatogenesis and spermiation in the cultured eel can be induced by repeated injections of HCG.

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References

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