Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Diet Composition of Oriental Bonito (Sarda orientalis) in Coatal Waters of Jeju Island, Korea

제주도 주변 해역에서 채집된 줄삼치(Sarda orientalis)의 위내용물 조성

  • Kim, Hyeon Ji (Fisheries Resources Research Center, National Institute of Fisheries Science) ;
  • Jeong, Jae Mook (Fisheries Resources Research Center, National Institute of Fisheries Science)
  • 김현지 (국립수산과학원 수산자원연구센터) ;
  • 정재묵 (국립수산과학원 수산자원연구센터)
  • Received : 2019.10.16
  • Accepted : 2020.03.04
  • Published : 2020.03.31
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Abstract

The feeding habits of oriental bonito (Sarda orientalis) were studied using 288 specimens collected in the coastal waters of Jeju Island, Korea from January to December 2015. Oriental bonito is pelagic piscivore that consumes mainly fishes especially Engraulis japonicus and Scomber japonicus. Its diet also includes small quantities euphausiids, amphipods and cephalopods. Oriental bonito showed ontogenetic changes in feeding habits. Although fishes were the primary food consumed by all size groups, the ratio of fishes was slightly increased as body size increase. There also was a significant relationships between mean prey number and weight according to size class and season.

줄삼치(Sarda orientalis)는 2015년 1월부터 12월까지 제주 주변해역에서 고등어 선망어선에 혼획된 288개체를 이용하였으며, 가랑이체장(fork length)과 체중을 각각 0.1 cm와 0.1 g까지 측정한 뒤 해부하여 먹이생물의 크기와 무게를 측정하고 최대한 종 수준까지 분석하였다. 먹이생물은 상대중요성지수비(%IRI)를 이용해 분석하였으며, 크기군과 계절에 따른 먹이조성 변화를 알아보았다. 줄삼치의 가장 중요한 먹이생물은 어류(Pisces)였으며, 그중에서도 멸치(Engraulis japonicus)가 가장 높은 비율을 보였다. 그 외 난바다곤쟁이류(Euphausiacea), 단각류(Amphipoda), 두족류(Cephalopoda)가 출현하였으나 그 양은 적었다. 줄삼치는 모든 크기군과 계절에서 어류가 가장 중요한 먹이생물이었으며, 성장하면서 먹이생물의 중량이 증가하였다.

Keywords

References

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