한국산 꺽지 Coreoperca herzi (농어목 꺽지과)의 생식주기

Reproductive Cycle of the Korean Perch, Coreoperca herzi (Perciformes: Centropomidae)

  • 임상구 (국립수산과학원 내수면양식연구센터) ;
  • 김계원 (전남신안 군청) ;
  • 정규화 (전남대학교 생물공학과) ;
  • 한창희 (동의대학교 분자생물학과) ;
  • 강기영 (서남대학교 의과대학 해부학교실) ;
  • 김정우 (서남대학교 의과대학 해부학교실)
  • Lim, Sang-Koo (Inland Aquaculture Research Center, National Fisheries Research & Development Institute) ;
  • Kim, Gye-Won (Chonnam Shinan County) ;
  • Chung, Gyu-Hwa (Deptpartement of Biotechnology, Chonnam National University) ;
  • Han, Chang-Hee (Deptartment of Molecular Biology, Dong-eui University) ;
  • Kang, Ki-Young (Department of Anatomy, College of Medicine, Seonam University) ;
  • Kim, Jung-Woo (Department of Anatomy, College of Medicine, Seonam University)
  • 투고 : 2011.09.27
  • 심사 : 2011.12.20
  • 발행 : 2011.12.31

초록

꺽지, Coreoperca herzi의 생식 년주기를 규명하기 위하여 1994년 7월부터 1996년 4월까지 경남 산청군 경호강에서 실험어를 채집하여 수온, 일장, GSI, HSI, 생식소의 조직학적 조사 및 혈중 스테로이드 호르몬의 농도변화를 조사하였다. GSI는 2월부터 급격히 상승하여 4월에 최대치를 나타내고 5월까지 높은 값을 유지하다가 하강하기 시작하여 8월에 최저값을 나타내었다. 혈중 E2, testosterone의 혈중 스테로이드 호르몬 농도는 GSI의 변화와 유사한 양상을 나타냈다. 방란, 방정 후 난소 소낭 내에서는 짧은 퇴화기가 관찰되며, 어린 난모세포가 계속 성장하여 난황합성 전기의 상태에서 저수온기에 휴지기 상태로 월동하여 이듬해 수온 상승기에 일제히 성장한다. 정소 역시 짧은 퇴화기(7월)와 오랜 휴지기(10~2월)를 가진다. 본 종의 생식 년주기는 성장 및 성숙기(2월~4월 초순), 완숙 및 산란기(4월 하순~6월 초순), 퇴화 및 정체기(7~8월), 회복기 (9월~11월 초순), 휴지기 (12월~1월)로 나누어지며 주 산란기는 5월이었다.

To clarify the annual reproductive cycle of the Korean perch, Coreoperca herzi, the seasonal changes in gonadosomatic index (GSI), hepatosomatic index (HSI), histological aspects of gonad and liver, and plasma levels of sex steroid hormones were investigated from June 1994 to April 1996. The annual variations of GSI and HSI were positively related to the plasma levels of sex steroid hormones. Estradiol-$17{\beta}$ (E2) and testosterone levels were raised during the April to May. Based on the related results, annual reproductive cycle of the fish could be divided into five successive stages; 1) Growing stage (from February to March: GSI was increased rapidly and oocytes with yolk vesicle was increased. Nucleus migrates toward the animal pole. Spermatids were activated from the epithelial tissue of lobuli). 2) Maturation and spawning stage (from April to June: Oocytes were accumulated yolk globules. Active spermatogenesis was observed). 3) Degeneration or stagnation phase (from July to August). 4) Recovery phase (from September to November) and 5) resting phase (from December to January). The main spawning period was in May.

키워드

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