魚病研究
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46 巻 , 3 号
選択された号の論文の5件中1~5を表示しています
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論文
  • Mayra I. Grano-Maldonado, James E. Bron, Matt Longshaw, Andrew P. Shin ...
    46 巻 (2011) 3 号 p. 71-79
    公開日: 2011/09/21
    ジャーナル フリー
    The potential of parasite transfer to an alternative host during short periods of cohabitation was explored. The work described in this paper suggests that either the field sampling process itself or the subsequent transportation of multiple fish species in the same container, may affect the correct allocation of parasites to hosts, and the diagnosis, management and control of gyrodactylosis in a variety of fish. Gyrodactylus infected specimens of three-spine sticklebacks Gasterosteus aculeatus, minnows Phoxinus phoxinus and stone loach Barbatula barbatula from one Scottish river were cohabited with one another in small volumes of water for 3 h. The study found that a small number of Gyrodactylus spp. transfer to atypical hosts. This study indicates that personnel involved in fish disease surveillance programmes should be aware of the possible consequences, in terms of inter-host transfer, of transporting multiple species in the same transport vessel. Diagnosticians should be aware of the facts that fish may act as temporary/paratenic hosts and that the apparent gyrodactylid fauna present following transport may not reflect that encountered under normal circumstances.
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  • 丹羽 稔久, 山本 淳, 荒木 亨介, 釜石 隆, 四宮 明彦
    46 巻 (2011) 3 号 p. 80-86
    公開日: 2011/09/21
    ジャーナル フリー
    Cultured Ryukyu ayu Plecoglossus altivelis ryukyuensis was found to be infected with a microsporidian parasite on Amami Oshima Island in January 2009. The parasite formed numerous cysts on the visceral organs and skin of the diseased fish. High temperature seemed to suppress the development of the parasite; in 2009 and 2010, the disease occurred in the 0-year fish from April to August, and afterwards the prevalence decreased dramatically in September and October. These characteristics well resembled glugeosis in ayu P. altivelis altivelis in other areas of Japan. This parasite seems to be indigenous to Amami Oshima Island, because it was detected in the museum specimens of wild Ryukyu ayu caught in 1991. Average dimensions of spores from Ryukyu ayu were slightly shorter and wider than those of Glugea plecoglossi, but the ranges of the measurements were overlapped. From the above characteristics and molecular analysis of SSU rRNA, it was concluded that the present microsporidian was included genus Glugea, but the specific identity remained to be clarified.
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