Factors causing mass mortality of cultured young bluefin tuna <i>Thunnus orientalis</i> during the spring of 2017 in Asou bay, Nagasaki, Japan

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  • 2017年春季に長崎県浅茅湾で発生した養殖クロマグロ幼魚の斃死要因
  • 2017ネン シュンキ ニ ナガサキケン アサジワン デ ハッセイ シタ ヨウショク クロマグロ ヨウギョ ノ ヘイシ ヨウイン

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Abstract

<p>　Mass mortality of cultured young bluefin tuna Thunnus orientalis, with the loss of approximately 2,400 individuals, occurred in Asou bay, Tsushima, Nagasaki, Japan in April 2017. Blood fluke eggs were observed in the gills of dead fish, but fish without severe infection also died. At the time, a noxious red tide of Heterosigma akashiwo was also detected (13-90 cells mL−1). However, the density of blood fluke eggs in the fish gills, or concentration of H. akashiwo cells in the area alone, was not high enough to have caused the mortality. Since both blood fluke eggs and H. akashiwo are known to have deleterious effects on the respiratory function of fish, the mass mortality was most likely caused by their synergistic effects.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 87 (4), 367-374, 2021-07-15

    The Japanese Society of Fisheries Science

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