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Diet composition of juvenile Korean piscivorous chub, Opsariichthys uncirostris amurensis in the surf zone of Nakdong river estuary, Korea

낙동강 하구역 해빈 쇄파대에서 출현하는 끄리(Opsariichthys uncirostris amurensis) 유어의 위내용물 조성

  • Baeck, Gun Wook (Department of Marine Biology & Aquaculture/Institute of Marine Industry, College of Marine Science, Gyeongsang National University) ;
  • Huh, Sung Hoi (Department of Oceanography, Pukyong National University) ;
  • Park, Joo Myun (Korea Inter-University Institutes of Oceanography, Pukyong National University)
  • 백근욱 (경상대학교 해양생명과학과/해양산업연구소) ;
  • 허성회 (부경대학교 해양학과) ;
  • 박주면 (부경대학교 해양과학공동연구소)
  • Received : 2014.07.22
  • Accepted : 2014.08.21
  • Published : 2014.08.31

Abstract

The diet composition of juvenile Korean piscivorous chub, Opsariichthys uncirostris amurensis were studied using 277 specimens collected from January to December 2004 in the surf zone of Nakdong river estuary. The size of Opsariichthys uncirostris amurensis ranged from 2.6 to 9.1 cm in standard length (SL). Opsariichthys uncirostris amurensis was carnivore that consumes mainly amphipods and insects. Its diet also included small quantities of polychaetes, fishes, and algae and plants. Opsariichthys uncirostris amurensis showed ontogenetic diet change. Smaller individuals (< 4 cm SL) mainly consumed amphipods. The portion of these prey items decreased with increasing fish size, and this decrease was paralleled with increased consumption of larger preys such as polychaetes and fishes. Insects were preyed moderated values in all size classes. Opsariichthys uncirostris amurensis diet also showed diel change with consuming more on amphipods and polychaetes during day.

Keywords

Diet composition;Opsariichthys uncirostris amurensis;Surf zone;Nakdong river estuary

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