ウナギのワタカブリ病における伝染性原発病の存在
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概要
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Observations were made on epizootics of fungus disease in eel populations which. were held in experimental aquaria containing Saprolegnia Parasitica. The diseasefrequently occurred in epizootic form in eel populations taken from ponds where the disease is known to prevail sometimes, whereas those from a fungus-disease free pond hardly contracted the disease. From those observations it was assumed that a morbid state which predisposes eels to fungus infection or causative agents, responsible for the state may be introduced by fish themselves from pond to aquarium. Mere exposure of healthy eels to fungus is not followed by fungus infection. But fungus disease could be brought about by exposing them to fungus in water with fungus-diseased eels or in water contaminated with the disease. This fact indicates that the morbid state may be communicable. The spread of the disease among healthy eels in water with infected fish or in contaminated water was inhibited by adding the antibiotic dihydrostreptomycin to the water. This suggests that the agent responsible for the morbid state may be a bacterium. It was found that fungus-diseased fish usually presented internal and external lesions similar to those reported for diseases of eels caused by bacteria. These findings suggest also that the state in question may be a sort of bacterial. disease. Description was made of characteristics of the lesions of the skin infected with. Saprolegnia Parasitica to set up the criterion for the diagnosis of fungus disease.
- 公益社団法人 日本水産学会の論文