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

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Diet composition and trophic level of jack mackerel, Trachurus japonicus in the South Sea of Korea

한국 남해에 출현하는 전갱이(Trachurus japonicus)의 위내용물 조성과 영양단계

  • KIM, Do-Gyun (Department of Seafood & Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University) ;
  • SEONG, Gi Chang (Department of Seafood & Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University) ;
  • JIN, Suyeon (Department of Seafood & Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University) ;
  • SOH, Ho Young (Department of Ocean Integrated Science, Chonnam National University) ;
  • BAECK, Gun Wook (Department of Seafood & Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
  • 김도균 (경상대학교 해양식품생명의학과/해양산업연구소/해양생물교육연구센터) ;
  • 성기창 (경상대학교 해양식품생명의학과/해양산업연구소/해양생물교육연구센터) ;
  • 진수연 (경상대학교 해양식품생명의학과/해양산업연구소/해양생물교육연구센터) ;
  • 서호영 (전남대학교 해양융합과학과) ;
  • 백근욱 (경상대학교 해양식품생명의학과/해양산업연구소/해양생물교육연구센터)
  • Received : 2021.01.15
  • Accepted : 2021.04.01
  • Published : 2021.05.31
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Abstract

Diet composition and trophic level of Trachurus japonicus were studied using 417 specimens collected by trawls, set nets and purse seine fisheries from March 2019 to February 2020 in the South Sea of Korea. The size of T. Japonicus ranged from 7.0 to 49.8 cm in total length. T. japonicus were a carnivore that fed mainly on euphausiids and pisces. In eddition, T. japonicus fed on small quantities of cephalopods, crabs etc. T. japonicus showed ontogenetic changes in feeding habits. The proportion of euphausiids decreased inversely proportional to body size whereas the consumption of pisces gradually increased. As body size of T. japonicus increased the mean number of prey per stomach and the mean weight of prey per stomach tended to increase, but the mean number of prey per stomach was not significantly different. As a result of the feeding strategy analysis, T. japonicus were specialized feeders with pisces and euphausiids as their dominant prey. The trophic level ranged between 3.57 ± 0.54 and 3.91 ± 0.65, and increased asymptotically with size of specimens. The average trophic level of the T. japonicus was 3.79 ± 0.61.

Keywords

Acknowledgement

이 논문은 2020년 해양수산부 재원으로 해양수산과학기술진흥원의 지원을 받아 수행된 연구임(ICT기반 수산자원관리 연구센터).

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