Mycobacteriosis in the Ryukyu-ayu(<i>Plecoglossus altivelis ryukyuensis</i>) caused by <i>Mycobacterium marinum</i> Infection

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  • リュウキュウアユにみられた<i>Mycobacterium marinum</i>の感染による抗酸菌症

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Here we report on mycobacteriosis in a captive population of an endangered fish species, the Ryukyuayu(Plecoglossus altivelis ryukyuensis), reared at the Okinawa Chura-umi aquarium in Japan. In 2004, some of these fish began to show clinical signs of the disease, such as a spinning motion and/or poor swimming ability, and petechiae on the body surface. The livers of diseased fish exhibited white nodules of various sizes. Apparent swelling of the trunk kidney was also seen in some cases. The most prominent histopathological characteristic was the presence of granulomatous lesions, which comprised a mosaic of macrophage-like cells, in the trunk kidney, spleen, liver, heart, gills and meninges. Numerous colonies of long and slender acid-fast rods were observed within the granulomatous lesions. The bacterial strain isolated from the diseased fish was identified as Mycobacterium marinum.

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