Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Annual Reproductive Cycle of Wild Female Yellow Croaker, Larimichthys polyactis

자연산 암컷 참조기, Larimichthys polyactis의 생식년주기

  • 강덕영 (국립수산과학원 서해수산연구소) ;
  • 조기채 (국립수산과학원 서해수산연구소) ;
  • 이진호 (국립수산과학원 서해수산연구소) ;
  • 강희웅 (국립수산과학원 서해수산연구소) ;
  • 김효찬 (부경대학교) ;
  • 김규희 (국립수산과학원 서해수산연구소)
  • Published : 2006.08.01
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Abstract

Annual reproductive cycle of small yellow croaker, Larimichthys polyactis were histologically investigated based on samples captured nearby the coast around Chujado, Youngkwang and Kanghwa, South Korea from February $2004{\sim}February$,2005. By histological survey, the annual reproductive cycle was classified into the following successive stages: The primary growth stage from September to October, the second growth stage from October to December, the mature stage from January to April, the final mature, ovulation and spawning stage from May to June, the degeneration stage from June to July and the rest stage from August to September. Throughout anatomical observation of the ovary, it is found that the small yellow croaker, L. polyactis belongs to an asynchronous and multiple spawner from late spring to early summer.

한국산 참조기 암컷의 연중 생식주기를 조사하기 위해, 2004년 2월부터 2005년 2월까지 계절에 따라 추자도, 영광 및 목포에서 포획된 자연산 암컷 참조기, Larimichthys polyactis을 조직학적으로 조사하였다. 참조기의 난소는 좌우비대칭의 낭상형으로 복강 배측(背側)후방부에 위치하며, 복강의 가장자리 뒤끝 부위에서 합일되어 뇨관과 연결되어 비뇨생식공으로 개구되어 있는 형태였다. 생체지수의 경우, 비만도(CF)와 간중량지수(HSI)는 생식선 발달과 특별한 상관관계가 없었으나, 대신 내장중량지수(VSI)는 역상관 관계, 생식소중량지수(GSI)는 정상관 관계를 나타내었다. 한편 생식세포 월별 변화의 조사를 통해 참조기는 수온이 낮아지기 시작하는 9월부터 생식소내 난원세포가 난모세포로 발달하기 시작하여 1차 성장기를 나타내고, 10월$\sim$12월에 2차 성장기를 보냈다. 다음해 1월$\sim$4월에 난소는 본격적으로 성숙을 시작하여, 5월에 최종 성숙, 배란 및 산란 단계를 나타내었다. 이후 6월까지 참조기는 왕성한 산란 시기에 머물러 있었으며, 7월에 이르러 산란 후 잔존 난모세포를 퇴화, 흡수시키고 8월에 이르러 휴지기에 접어들었다. 이때 생식세포발달 양식은 난군동기발달형이며, 산란형은 봄-여름 산란형인 것을 알 수 있었다.

Keywords

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