Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Effect of Water Temperature on the Egg Hatch and Early Growth of Walleye Pollock (Gadus chalcogrammus)

명태(Gadus chalcogrammus)의 수온별 부화 및 초기 성장

  • Choi, Jin (Aquaculture Management Division, National Institute of Fisheries Science) ;
  • Han, Gyeong Sik (Aquaculture Industry Research Division, East Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Lee, Ki Wook (Aquaculture Industry Research Division, East Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Byun, Soon-Gyu (Aquaculture Industry Research Division, East Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Lim, Hyun Jeong (Aquaculture Industry Research Division, East Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Kim, Hee Sung (Department of Marine Seafood and Aquaculture Science, Gyeongsang National University)
  • 최진 (국립수산과학원 양식관리과) ;
  • 한경식 (국립수산과학원 동해수산연구소) ;
  • 이기욱 (국립수산과학원 동해수산연구소) ;
  • 변순규 (국립수산과학원 동해수산연구소) ;
  • 임현정 (국립수산과학원 동해수산연구소) ;
  • 김희성 (경상대학교 해양식품생명의학과)
  • Received : 2020.03.24
  • Accepted : 2020.04.29
  • Published : 2020.06.30
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Abstract

This study aimed to investigate the effects of different water temperature (5, 8 and 11℃) on egg hatch and larval growth of walleye pollock Gadus chalcogrammus to improve rearing techniques for this species. Survival of eggs maintained at 5℃ was higher than that of eggs maintained at 8℃ and 11℃. The greatest hatching rate was obtained for larvae maintained at 8℃. However, time to first, 50% and 100% hatch of eggs maintained at 11℃ was shorter than at 5℃ and 8℃. A higher survival was observed in larvae reared at 5℃ compared to 8℃ and 11℃ and the greatest growth was observed in larvae reared at 11℃ compared to 5℃ and 8℃ during the feeding trial. This study demonstrated the importance of water temperature, as it affects culture performance of eggs and larval pollock. The results from this study provides valuable information for further development of pollock aquaculture.

수온은 양식 대상어의 종자생산에 영향을 미치는 중요한 환경 요인이다. 본 연구는 최근 급격한 자원 감소를 보이고 있는 한해성 어종인 명태의 안정적인 종자생산을 위한 기초자료로 활용하기 위해 수온이 명태의 부화 및 초기 자어 성장에 미치는 영향을 조사하였다. 수정란의 생존율은 5℃가 8℃와 11℃에 비하여 높게 나타났으며, 부화율은 8℃에서 가장 우수하게 나타났다. 그러나 첫 부화, 50% 부화 및 완전 부화까지의 소요 시간은 11℃가 5℃와 8℃에 비하여 빠르게 나타났다. 12주간의 사육기간 동안 자어의 생존율은 5℃가 8℃와 11℃에 비하여 높게 나타났으나, 성장은 11℃가 5℃와 8℃에 비하여 높게 나타났다.

Keywords

References

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