Journal of Ecology and Environment

The Ecological Society of Korea (한국생태학회)
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Diet composition and feeding strategy of John Dory, Zeus faber, in the coastal waters of Korea

  • Kim, Han Ju (Department of Marine Biology, Pukyong National University) ;
  • Kim, Hyeong-Gi (School of Earth and Environmental Sciences and Research Institute of Oceanography, Seoul National University) ;
  • Oh, Chul-Woong (Department of Marine Biology, Pukyong National University)
  • Received : 2019.11.25
  • Accepted : 2020.03.17
  • Published : 2020.03.31
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Abstract

Background: Most fish undergo prey switch from juvenile to adult. It is thought that slightly different feeding habits occur among adult fishes due to growth, spawning, habitat change, and so on. Therefore, the diet of the John Dory Zeus faber (≥ 24 cm TL) was studied in the coastal waters of Korea by analysis of stomach contents, with comparison by season and size class of diet composition and prey diversity. Monthly samples were taken from February 2017 to January 2018. Results: The results showed that the John Dory was a piscivorous predator, and pisces had occupied 82.3% of IRI%. Trichiurus lepturus and Trachurus japonicus were important preys in all size classes and seasons. Diet composition differed among the size classes and seasons (Chi-square test, P < 0.05). As body size of Z. faber increased, the occurrence of benthic fish (Glyptocephalus stelleri) tended to increase. The seasonal prey composition also changed depending on the abundant species of each season. Conclusions: Z. faber is a piscivorous predator. The consumption habits of Z. faber appear to different results by their size and seasons. This study suggests that Z. faber could be considered an opportunistic predator.

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