Studies on red spot disease of pond-cultured eels—I:The occurrence of the disease in eel culture ponds in Tokushima prefecture in 1972

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A bacterial disease named"Sekiten-byo"(red spot disease)of eels occurred in 1971 in Shizuoka and Tokushima Prefectures, and the causative bacterium was identified as Pseudomonas anguilliseptica by WAKABAYASHI and EGUSA(1972).<BR>The present authors investigated the occurrence of the disease in Tokushima prefecture in 1972.<BR>1) In spring(AprilMay), the epizootic was prevalent in eel culture ponds in this prefecture, and it ceased in summer(August), but in autumn(October)it recurred. This vicissitude was confirmed by field observations and recognitions of the pathogen (Ps.anguilliseptica). It is supposed on the basis of the field observations and results of experimental infection that the disease occurs when water temperature of ponds is below 20°C, and ceases when it rises to2627°C.<BR>2) This infection occurred preferably in the Japanese eels(Anguilla japonica)and in ponds which contain some amounts of saline.<BR>3) Especially in spring, some eels were infected not only with Ps. anguilliseptica but also with Aeromonas liquefaciens and Vibrio anguillarum.
日本魚病学会の論文