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 Korean waters

한국 연근해에 출현하는 태평양참다랑어 Pacific bluefin tuna, Thunnus orientalis의 식성

  • Jo, Heon Ju (Distant Water Fisheries Resources Division, National Institute of Fisheries Science) ;
  • LEE, Sung Il (Distant Water Fisheries Resources Division, National Institute of Fisheries Science) ;
  • KIM, Doo Nam (Distant Water Fisheries Resources Division, National Institute of Fisheries Science) ;
  • LEE, Mi Kyung (Distant Water Fisheries Resources Division, National Institute of Fisheries Science)
  • 조헌주 (국립수산과학원 원양자원과) ;
  • 이성일 (국립수산과학원 원양자원과) ;
  • 김두남 (국립수산과학원 원양자원과) ;
  • 이미경 (국립수산과학원 원양자원과)
  • Received : 2019.01.31
  • Accepted : 2019.02.11
  • Published : 2019.02.28
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Abstract

The feeding habits of Pacific bluefin tuna, Thunnus orientalis were analyzed using samples by large purse seine fishery in Korean waters from 2012 to 2017. The number of samples was 1,274 and the fork-length (FL) ranged from 34.6 to 218.0 cm. According to %IRI, the Important main prey items of immature individuals (below 91.4 cm in FL) were Pisces, Cephalopoda and Euphausiacea and those of mature individuals were Cephalopoda and Pisces. T. orientalis showed ontogenetic changes in prey item that Pisces was dominated in size class of 30-89 cm (FL), Cephalopoda in 90-179 cm (FL), and Pisces above 180 cm. As for seasonal changes in prey item, Cephalopoda was dominant in spring and Pisces was dominant in summer, autumn and winter. %F, %N, %W and %IRI cluster analysis divided area into three groups: Group A was dominated by Pisces; Group B was dominated by Cephalopoda, and Group C was dominated by Euphausiacea.

Keywords

References

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