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DANG Yingchao, CHEN Yilin, DAI Xiaojie, LI Yunkai, WU Feng, LIU Pan. A preliminary study on autumn feeding habits of bigeye tuna (Thunnus obesus) in subtropical waters of North Pacific[J]. South China Fisheries Science, 2020, 16(1): 78-86. DOI: 10.12131/20190184
Citation: DANG Yingchao, CHEN Yilin, DAI Xiaojie, LI Yunkai, WU Feng, LIU Pan. A preliminary study on autumn feeding habits of bigeye tuna (Thunnus obesus) in subtropical waters of North Pacific[J]. South China Fisheries Science, 2020, 16(1): 78-86. DOI: 10.12131/20190184
shu

A preliminary study on autumn feeding habits of bigeye tuna (Thunnus obesus) in subtropical waters of North Pacific

  • 1.

    College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China

  • 2.

    Collaborative Innovation Center for Distant-Water Fisheries/National Engineering Research Center for Distant-Water Fisheries/Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China

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  • Received Date: September 15, 2019
  • Revised Date: October 21, 2019
  • Available Online: December 05, 2019
    Graphical Abstract
    • Abstract
  • We analyzed the stomach contents of 146 bigeye tuna (Thunnus obesus) collected in the subtropical waters of the North Pacific (150°W−164°W, 30°N−37°N) from September to December in 2018 by the Chinese Longline Fisheries Observer Programme. A total of 36 bait species belonging to 28 families were identified. Alepisaurus ferox, Eucleoteuthis luminosa, Lestidium prolixum and Diaphus sp. were the dominant baits, whose relative importance index ratios (IRI%) were 25.65%, 14.48%, 7.56% and 6.77%, respectively. The feeding intensity of bigeye tuna reached the maximum value in the range of 100−110 cm fork length and at Stage III of gonadal maturity, while reached the minimum value at Stage V. Moreover, higher feeding intensity was observed at water layer of 150−250 m. The results improve the understanding of the biological characteristics and feeding habits of bigeye tuna, in addition to its important role in the ecosystem and food network structure.
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    • References (34)
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