Effect of giant jellyfish <i>Nemopilema nomurai</i> as supplemental feed on threadsail filefish <i>Stephanolepis cirrhifer</i>

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  • MIYAJIMA-TAGA YUKO
    Maizuru Fisheries Research Station, Kyoto University, Nagahama
  • MASUDA REIJI
    Maizuru Fisheries Research Station, Kyoto University, Nagahama
  • KURIHARA AYAKO
    Devision of Marine Science, Tokyo University of Marine Science and Technology
  • YAMASHITA YOH
    Maizuru Fisheries Research Station, Kyoto University, Nagahama
  • TAKEUCHI TOSHIO
    Devision of Marine Science, Tokyo University of Marine Science and Technology

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Other Title
  • カワハギに対する補助餌料としてのエチゼンクラゲ給餌効果
  • カワハギ ニ タイスル ホジョ ジリョウ ト シテ ノ エチゼンクラゲキュウジ コウカ

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Abstract

  We conducted a 30-day feeding experiment on threadsail filefish Stephanolepis cirrhifer to evaluate the efficacy of giant jellyfish Nemopilema nomurai on the growth and body composition of the filefish. Four treatments were prepared: starved (control, S), fed only jellyfish (J), fed only pellets (control, P), and fed both jellyfish and pellets (JP). Threadsail filefish consumed the giant jellyfish as much as 5.6 and 4.1 times their own body weight per day in the J and JP treatments, respectively. Fish in the S treatment had 68% mortality, whereas the J treatment had no mortality. Fish in the JP treatments showed significantly faster growth than those in the P treatment. The giant jellyfish contained a high ratio of n-6 highly unsaturated fatty acids, especially arachidonic acid as well as free amino acids, especially taurine. The high contents of these acids reflected those of fish body composition. These results showed that feeding giant jellyfish for threadsail filefish improved their growth and body composition, and we therefore recommend the use of jellyfish as supplemental feed for stock enhancement or aquaculture.<br>

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