Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Diet Composition of Whitespotted Conger, Conger myriaster in the Coastal Waters of Geoje Island, Korea

거제 주변해역에 출현하는 붕장어(Conger myriaster)의 위내용물 조성

  • Kim, Kyung Ryul (Department of Seafood & Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University) ;
  • Nam, Ki Mun (Pukyong Marine Life Research Institute) ;
  • Park, Kyeong Hyeon (Korea Fisheries Resources Agency) ;
  • Kim, Byong Seob (Korea Fisheries Resources Agency) ;
  • Han, Myung Il (Korea Fisheries Resources Agency) ;
  • Kwak, Ju Won (Korea Fisheries Resources Agency) ;
  • Baeck, Gun Wook (Department of Seafood & Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
  • 김경률 (경상대학교 해양식품생명의학과/해양산업연구소/해양생물교육연구센터) ;
  • 남기문 (부경해양생물연구소) ;
  • 박경현 (한국수산자원공단 남해본부) ;
  • 김병섭 (한국수산자원공단 남해본부) ;
  • 한명일 (한국수산자원공단 남해본부) ;
  • 곽주원 (한국수산자원공단 남해본부) ;
  • 백근욱 (경상대학교 해양식품생명의학과/해양산업연구소/해양생물교육연구센터)
  • Received : 2020.04.10
  • Accepted : 2020.05.28
  • Published : 2020.06.30
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Abstract

The diet composition of whitespotted conger, Conger myriaster was studied using 129 specimens collected in the coastal waters Geoje, Korea from June 2018 to May 2019. The size of the specimens ranged from 11.5~22.9 cm in preanus length (AL). C. myriaster was a piscivore that consumes mainly pisces such as Engraulis japonicus and Gobiidae (%IRI: 98.4%). Of the fish species E. japonicus was the most preferred prey. Based on these results, it is considered that Conger myriaster has a characteristic of feeding on abundant prey organisms in the study area. The dietary compositions of C. myriaster was not significantly different among size classes. These results are considered to be due to a lack of specimens and the various size groups were not collected. Based on these results, it is thought that immature fishes inhabit the coast of Geoje. As body size of C. myriaster increased the mean weigh of prey per stomach (mW/ST) tended to increase (one-way ANOVA, P<0.05).

붕장어(Conger myriaster)는 2018년 6월부터 2019년 5월까지 거제 구조라, 망치 인근해역에서 장구형통발을 이용하여 매달 1회 채집해 이용하였으며, 항문장(Preanus length)과 습중량을 각각 0.1 cm, 0.1 g까지 측정한 뒤 위를 적출하여 가능한 종 수준까지 분석하였다. 위내용물 분석결과는 각 먹이생물에 대한 출현빈도(%F), 개체수비(%N), 습중량비(%W)를 구하여 상대 중요도지수비(%IRI)로 수치화하여 주 먹이생물과 크기군에 따른 먹이조성 변화를 알아보았다. 붕장어의 가장 중요한 먹이생물은 어류(Pisces)였으며, 그중 멸치(Engraulis japonicus)가 가장 우점한 먹이생물로 확인되었다. 그 외, 새우류(Macrura), 패충류(Ostracoda), 갯지렁이류(Polychaeta), 게류(Brachyura) 등 다양한 먹이생물을 섭식하였지만 그 양은 많지 않았다. 과거 광양만에서 이루어진 연구에서는 붕장어의 주 먹이생물이 날개망둑(Favonigobius gymnauchen)으로 나타나 이번 연구결과와 다소 차이가 있었다. 성장에 따른 위내용물 조성의 변화를 살펴본 결과, 뚜렷한 먹이전환이 나타나지 않았다. 붕장어는 성장함에 따라 개체당 평균 먹이생물의 개체수(mN/ST)는 통계적으로 유의한 차이를 보이지 않았으나, 평균 먹이생물의 중량(mW/ST)은 붕장어의 항문장이 증가함에 따라 유의하게 증가하는 경향을 보였다.

Keywords

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