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Maturation and spawning of the Pacific cod, Gadus macrocephalus TILESIUS in East Sea of Korea

한국 동해안 대구, Gadus macrocephalus TILESIUS의 성숙과 산란

  • Can, Hyung-Kee (Fisheries Resources Research Team, East Sea Fisheries Research Institute, NFRDI) ;
  • Lee, Sung-Il (Fisheries Resources Research Team, East Sea Fisheries Research Institute, NFRDI) ;
  • Yoon, Sang-Chul (Fisheries Resources Research Team, East Sea Fisheries Research Institute, NFRDI) ;
  • Kim, Young-Seop (Research Support, Team, West Sea Fisheries Research Institute, NFRDI) ;
  • Chun, Young-Yull (Deep-sea Fisheries Resources Research Center, East Sea Fisheries Research Institute, NFRDI) ;
  • Chang, Dae-Soo (Fisheries Resources Research Team, East Sea Fisheries Research Institute, NFRDI) ;
  • Yang, Jae-Hyeong (Fisheries Resources Research Team, East Sea Fisheries Research Institute, NFRDI)
  • 차형기 (동해수산연구소 어업자원팀) ;
  • 이성일 (동해수산연구소 어업자원팀) ;
  • 윤상철 (동해수산연구소 어업자원팀) ;
  • 김영섭 (서해수산연구소 연구지원팀) ;
  • 전영열 (동해수산연구소 심해연구센터) ;
  • 장대수 (동해수산연구소 어업자원팀) ;
  • 양재형 (동해수산연구소 어업자원팀)
  • Published : 2007.11.30

Abstract

Maturation and spawning of the Pacific cod, Gadus macrocephalus was investigated based on the samples captured in East Sea of Korea from April 2006 to July 2007. Gonadosomatic index began to increase in November, and reached maximum between December and January. After spawning it began to decrease from March. Reproductive season was estimated to November-February, with peak in January. Fecundity was proportional to the size of the female, with the clutch size varying from 753,985 eggs in the smallest female(TL=58.6cm) to 9,311,520 eggs in the largest(TL=101.0cm). Size at 50% sexual maturity(TL50%) determined from mature females was 56.3cm of TL. Annual reproductive cycles of this species could be divided into six successive stages; immature stage(March-September), nucleolus stage(September-October), yolk vesicle stage(October-November), vitellogenic stage (November-December), ripe stage and spent stage(December-February).

Keywords

Maturation;Spawning;Annual reproductive cycle;Pacific cod;East Sea of Korea

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