Prevalence and transmission capability of <i>Didymocystis wedli</i> (Digenea; Didymozoidae) in cage-reared young Pacific bluefin tuna <i>Thunnus orientalis</i> in the Amami area of Japan

DOI JASI Web Site 24 References
  • TAKEBE TAKAYUKI
    Research Center for Subtropical Fisheries, Seikai National Fisheries Research Institute, Fisheries Research Agency
  • SAEKI YU
    College of Bioresource Sciences, Nihon University
  • MASUMA SHUKEI
    Japan Sea National Fisheries Research Institute, Fisheries Research Agency
  • NIKAIDO HIDEKI
    Research Center for Tuna Aquaculture, Seikai National Fisheries Research Institute, Fisheries Research Agency
  • IDE KENTARO
    National Research Institute of Aquaculture, Fisheries Research Agency
  • SHIOZAWA SATOSHI
    Research Center for Tuna Aquaculture, Seikai National Fisheries Research Institute, Fisheries Research Agency
  • MANO NOBUHIRO
    College of Bioresource Sciences, Nihon University

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Other Title
  • クロマグロ幼魚に寄生していた吸虫ディディモゾイド科 <i>Didymocystis wedli</i> の奄美大島海域における消長および伝搬性
  • クロマグロ幼魚に寄生していた吸虫ディディモゾイド科Didymocystis wedliの奄美大島海域における消長および伝搬性
  • クロマグロ ヨウギョ ニ キセイ シテ イタ キュウチュウ ディディモゾイドカ Didymocystis wedli ノ アマミ オオシマ カイイキ ニ オケル ショウチョウ オヨビ デンパンセイ

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Abstract

  We investigated the prevalence and transmission capability of Didymocystis wedli Ariola, 1092 (Digenea; Didymozoidae) in the gills of young Pacific bluefin tuna (PBT) Thunnus orientalis in the Amami area of Japan between November 2004 and May 2005. All young PBT caught in the Japan Sea in November 2004 were infected with D. wedli, while no infection was observed in young PBT caught in the Pacific between August and September 2004. However, the prevalence of the former group of PBT decreased during cage-rearing in Amami and finally reached 0% in April 2005. The parasitism of D. wedli was not confirmed in young PBT from the Pacific or adult PBT reared in the same cages as PBT from the Japan Sea or adjacent cages throughout this experiment. These results suggest that the introduction of young PBT from other areas does not cause transmission of D. wedli in the Amami area.<br>

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