Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Feeding Habits of the Largehead Hairtail, Trichiurus japonicus in the Yellow Sea of Korea

우리나라 서해에서 출현하는 갈치(Trichiurus japonicus)의 식성

  • Seong, Gi Chang (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University) ;
  • Kim, Do-Gyun (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University) ;
  • Kang, Da Yeon (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University) ;
  • Jin, Suyeon (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University) ;
  • Kim, Hoseung (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University) ;
  • Soh, Ho Young (Department of Ocean Intergrated Science, Chonnam National University) ;
  • Baeck, Gun Wook (Department of Marine Biology & Aquaculture/Department of Aquaculture Science/Institute of Marine Industry/Marine Bio-Education & Research Center, College of Marine Science, Gyeongsang National University)
  • 성기창 (경상국립대학교 해양생명과학과/양식생명과학과/해양산업연구소/해양생물교육연구센터) ;
  • 김도균 (경상국립대학교 해양생명과학과/양식생명과학과/해양산업연구소/해양생물교육연구센터) ;
  • 강다연 (경상국립대학교 해양생명과학과/양식생명과학과/해양산업연구소/해양생물교육연구센터) ;
  • 진수연 (경상국립대학교 해양생명과학과/양식생명과학과/해양산업연구소/해양생물교육연구센터) ;
  • 김호승 (경상국립대학교 해양생명과학과/양식생명과학과/해양산업연구소/해양생물교육연구센터) ;
  • 서호영 (전남대학교 해양융합과학과) ;
  • 백근욱 (경상국립대학교 해양생명과학과/양식생명과학과/해양산업연구소/해양생물교육연구센터)
  • Received : 2022.07.05
  • Accepted : 2022.09.01
  • Published : 2022.09.30
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Abstract

The feeding habits of Largehead hairtail Trichiurus japonicus was studied using 377 specimens collected in the Yellow Sea of Korea. The specimens ranged from 4.5 to 33.7 cm in Anal length (AL). T. japonicus consumed mainly a piscivore, such as Engraulis japonicus [percent index of relative importance (%IRI) =74.1%]. We calculated the trophic level as 3.84 for T. japonicus. Fishes were the main prey items for all seasons. The main fish prey during autumn and winter was E. japonicus, whereas those during spring and summer was Larimichthys polyactis. Fishes were the main prey items for all size groups (<15 cm, 15~20 cm, 20~25 cm, ≥25 cm). T. japonicus also showed size-related dietary shift from Spratelloides gracilis and E. japonicus to L. polyactis and T. japonicus. As the anal length of T. japonicus increased, the mean number of preys per stomach (mN/ST) and the mean weight of preys per stomach (mW/ST) tended to increased (One-way ANOVA, P<0.05). Seasonal and size-related shifts in dietary composition were investigated by PERMANOVA analysis, which showed significant variations among size classes and seasons.

우리나라 서해에서 출현하는 갈치의 식성을 파악하기 위해 4.5~33.7 cm의 항문장 범위를 나타내는 377개체의 위내용물을 분석하였다. 갈치의 주 먹이생물은 74.1%의 상대중요도지수비를 나타낸 어류였고, 멸치가 가장 우점하였다. 이번 연구에서 갈치의 영양단계는 3.84를 나타내었다. 어류는 모든 계절 동안 갈치의 가장 중요한 먹이생물이었으며, 가을철과 겨울철에는 멸치가 우점하였고, 봄철과 여름철에는 참조기가 우점하였다. 어류는 갈치의 모든 크기군(<15 cm, 15~20 cm, 20~25 cm, ≥25 cm)에서 가장 중요한 먹이생물이었으며, 크기가 작은 개체의 경우 샛줄멸과 멸치를 주로 섭식하다 항문장이 커짐에 따라 참조기와 갈치의 섭식 비율이 높아지는 것으로 나타났다. 또한 갈치의 항문장이 커짐에 따라 평균 먹이생물 개체수와 중량이 증가하는 경향을 나타내었다. PERMANOVA 분석을 통해 계절과 크기군에 따라 갈치의 식성은 유의한 차이를 보이는 것으로 나타났다.

Keywords

Acknowledgement

이 논문은 2022년 해양수산부 재원으로 해양수산기술진흥원의 지원을 받아 수행된 연구임(ICT기반 수산자원관리연구센터).

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