人為感染による過形成の回復過程〔英文〕

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The process of the recovery from bacterial gill disease induced by an artificial infection was examined by transmission and scanning electron microscopy. Artificial infection was accomplished by immersing healthy trout fingerlings for 60min in a bacterial suspension. Five days later, the diseased fingerlings were immersed for one minute in a 5% solution of sodium chloride, followed by fixation at intervals of 2h, 1, 2, 3, 4, and 5 weeks. Bacterial gill disease induced by the artificial infection was characterized by a hyperplasia similar to that due to a natural infection. Epithelial and chloride cells, which were enclosed in the interior of the lesions by the fusion of gill lamellae, showed a cytoplasmic "cutting-away" or "fragmentation" at the cell perphery. This phenomenon was most striking in chloride cells, but was not found in mucous cells. One week after the salt solution treatment, epithelial and chloride cells in the outermost layer of the lesions had begun to degenerate or break down and then exfoliate. The increase of lysosomes was striking in the enclosed cells. In the superficial layers of epithelial cells, electron lucent or pale granules (275nm in average diameter) appeared in the cytoplasm. The granule formation and subsequent opening were most striking in cases two weeks after the salt solution treatment, thus the opening may help to accelerate healing of the lesions. With the passing of time, the hyperplastic lesions progressively healed and complete recovery was seen five weeks after the salt solution treatment. The present experiments reaffirmed that the bacterium which we have isolated is a causative agent of bacterial gill disease.
日本水産學會の論文

人為感染による過形成の回復過程〔英文〕

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