Feeding Habits of the Pacific Cod Gadus macrocephalus in Southeast Sea of Korea

한국 남동부해역 대구 Gadus macrocephalus의 식성

  • Lee, Jeong-Hoon (Southeast Fisheries Research Institute, NFRDI) ;
  • Kim, Jung Nyun (Southeast Fisheries Research Institute, NFRDI) ;
  • Park, Junsu (Southeast Fisheries Research Institute, NFRDI) ;
  • Park, Tamina (Korea Fisheries Resources Agency) ;
  • Nam, Ki Mun (Marine Research Center, National Park Research Institute, Korea National Park Service)
  • 이정훈 (국립수산과학원 남동해수산연구소) ;
  • 김정년 (국립수산과학원 남동해수산연구소) ;
  • 박준수 (국립수산과학원 남동해수산연구소) ;
  • 박탐이나 (한국수산자원관리공단) ;
  • 남기문 (국립공원연구원 해양연구센터)
  • Received : 2014.10.29
  • Accepted : 2015.06.10
  • Published : 2015.06.30

Abstract

The feeding habits of the Pacific cod Gadus macrocephalus were studied using 620 specimens collected by bottom trawl and pound net in the Southeast sea of Korea, from February 2012 to June 2013. Of 620 specimens, 192 contained food and 428 were empty. The total length (TL) of individuals used in this study ranged from 20.4 to 95.2 cm. Pacific cod mainly consumed Pisces, Macrura, and Cephalopoda. Its diet also included small quantities of Anomura, Brachyura, Mysidacea, Isopoda and Amphipoda. The proportion of Pisces in prey items increased with increasing Pacific cod length, but seasonal difference was not observed. The proportion of Macrura and Cephalopoda decreased with growth, and seasonal differences were apparent. Macrura were taken there mainly from autumn to winter, whereas Cephalopoda were consumed from spring to summer.

2012년 2월부터 2013년 6월까지 남동부해역에서 기선저인망과 호망에 의해 채집된 대구 620 개체의 식성을 조사하였다. 620개체 중 192개체는 먹이가 포함되어 있었고, 428개체는 공위였다. 연구에 사용된 개체의 전장범위는 20.4~95.2 cm였다. 대구는 주로 어류, 새우류, 두족류를 섭식하였고, 소량이지만 집게류, 게류, 곤쟁이류, 등각류, 단각류 등도 섭식하였다. 먹이생물 중 어류의 비율은 대구의 전장이 커질수록 증가하였으나, 계절적 변화는 없었다. 새우류와 두족류의 비율은 성장하면서 감소하였고, 계절적 차이는 뚜렷하였다. 가을부터 겨울까지 주로 새우류가 포함되어 있는 반면, 봄부터 여름까지는 두족류가 많이 포함되어 있었다.

Keywords

Acknowledgement

Supported by : 국립수산과학원

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