Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Effects of Adhesive Substrates and Bottom Materials on Release of Fertilized Eggs by Pacific Cod, Gadus macrocephalus

대구 (Gadus macrocephalus) 수정란 방류 시 부착기질과 저질의 영향

  • Lee, So-Gwang (Gyeongsangnamdo Fisheries Resources and Research Institute) ;
  • Park, Kyung-Dae (Gyeongsangnamdo Fisheries Resources and Research Institute) ;
  • Gwak, Woo-Seok (Division of Marine Bioscience, The Institute of Marine Industry Gyeongsang National University)
  • 이소광 (경상남도 수산자원연구소) ;
  • 박경대 (경상남도 수산자원연구소) ;
  • 곽우석 (국립경상대학교 해양생명과학과)
  • Published : 2009.02.28
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Abstract

The effects of adhesive substrates and bottom materials on the release of fertilized eggs by the Pacific cod, (Gadus macrocephalus) were examined to find an effective release method. Palm twin as an adhesive substrate displayed a significantly elevated adhesive rate compared to gulf weed. However, the survival rate of the fertilized eggs attached to palm twin was as low as 17.5% 8 days after fertilization (DAF). In contrast, fertilized eggs in the absence of adhesive substrate displayed the highest survival rate (47.0%). Concerning bottom materials, the survival rate of fertilized eggs on sand was significantly high (approximately 51.1%) on 8 and 9 DAF. The observations indicates that adhesive substrates are not needed and spawning ground bottom materials such as sand or mud should be considered when releasing fertilized eggs of Pacific cod.

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References

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