Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Comparison of Stomach Contents of Pacific Cod (Gadus macrocephalus) in Korean Coastal Waters

우리나라 연안에 서식하는 대구(Gadus macrocephalus)의 위 내용물 비교

  • Park, Chung Youl (Division of Marine Bioscience, The Institute of Marine Industry, Gyeongsang National University) ;
  • Gwak, Woo Seok (Division of Marine Bioscience, The Institute of Marine Industry, Gyeongsang National University)
  • 박충열 (국립 경상대학교 해양생명과학과) ;
  • 곽우석 (국립 경상대학교 해양생명과학과)
  • Received : 2008.12.24
  • Accepted : 2009.03.03
  • Published : 2009.03.31
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Abstract

The diet of Pacific cod (Gadus macrocephalus) in the East Sea, Yellow Sea and Jinhae Bay was studied by analysis of stomach contents. In total, 518 individuals ranging from 15.5 to 77.0 cm standard length SL were analyzed. Prey organisms of the Pacific cod in the East Sea consistedof Caridea, Cephalopoda and Pisces, whereas In the Yellow Sea, the main food items of Pacific cod were similar to those of East Sea Pacific cod except for Cephalopoda. Interestingly, the stomach contents of Pacific cod in Jinhae Bay is mainly Pisces, which is in contrast to those of the two different coastal areas, the East Sea and the Yellow Sea. Although various species of food were eaten by smaller Pacific cod, both Caridea and Pisces were mainly taken by larger Pacific cod. Consequently, the diet of Pacific cod within acertain size is mainly influenced by prey abundance and prey-size spectrum in its habitat. Higher stomach emptiness of Pacific cod in Jinhae Bay might indicate that fully matured Pacific cod temporally stop feeding during their spawning period.

본 연구는 위 내용물 분석에 의하여 우리나라 동해, 서해, 진해만에 서식하는 대구의 먹이에 관하여 조사하였다. 분석한 대구 시료는 총 518개체였으며, 체장 범위는 15.5~77.0 cm 였다. 동해안 대구의 주요 먹이 조성은 새우류, 두족류, 어류였다. 서해안 대구의 주요 먹이 조성은 두족류를 제외한 나머지 항목에서 동해안 대구와 유사하였다. 반면에 진해만 대구는 다른 두 해역과 달리 어류를 주로 섭식하는 것으로 나타났다. 작은 크기의 대구는 다양한 먹이를 섭식 하지만 성장하면서 새우류와 어류를 주로 섭식하는 것으로 나타났다. 따라서 특정 크기에 있어서 대구의 먹이는 서식지의 먹이 풍부도와 그 크기에 많은 영향을 받는다. 진해만 대구의 높은 공위율은 성숙한 대구가 산란기 동안에 일시적으로 섭식을 중지하는 것과 관계있는 것으로 보인다.

Keywords

Acknowledgement

Supported by : 해양수산부

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