Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Feeding habits of the Pacific bluefin tuna, Thunnus orientalis in the southern sea of Korea

한국 남해안에 출현하는 태평양참다랑어 Pacific bluefin tuna, Thunnus orientalis의 식성

  • YOON, Sang Chul (Dokdo Fisheries Research Center, National Institute of Fisheries Science) ;
  • YOO, Joon Taek (Fisheries Resources and Environment Research Division, South Sea Fisheries Research Institute, National Institute of Fisheries Science) ;
  • LEE, Sung Il (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • KIM, Zang Geun (Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science) ;
  • CHOI, Kwang Ho (Dokdo Fisheries Research Center, National Institute of Fisheries Science)
  • 윤상철 (국립수산과학원 독도수산연구센터) ;
  • 유준택 (국립수산과학원 남해수산연구소 자원환경과) ;
  • 이성일 (국립수산과학원 원양자원과) ;
  • 김장근 (국립수산과학원 원양자원과) ;
  • 최광호 (국립수산과학원 독도수산연구센터)
  • Received : 2015.09.17
  • Accepted : 2015.11.23
  • Published : 2015.11.30
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Abstract

The feeding habits of the Pacific bluefin tuna, Thunnus orientalis were examined based on the stomach contents of 330 specimens caught by offshore large purse seine fishery in the southern sea of Korea, 2011. The size of Pacific bluefin tuna used in this study ranged from 34.1 to 67.3 cm in fork length (FL). The percentage of empty stomachs was 41.8%. The main prey items were Pisces and Cephalopoda based on percentage IRI (index of relative importance). The main fish preys were Trachurus japonicus, Bregmaceros japonicus, Engraulis japonicus, and Cephalopoda were Todarodes pacificus, Loligo edulis, Watasenia scintillans. T. orientalis showed ontogenetic change in diet composition. Although Pisces dominated the diet of all length classes the portion of Cephalopoda was relatively higher in size between 40 and 50 cm other than length classes. In terms of seasonal variation in feeding habits, Pisces was the main prey group in all seasons, but Cephalopoda was also frequently consumed during spring and autumn based on %IRI.

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References

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