Nephroblastomas in Japanese

Nephroblastomas were observed in 50 Japanese eels (Anguilla japonica) in indoor tanks with water temperature controlled at about 26°C (Masahito et al.,

1992). Potential causes for these nephroblastomas included chemical carcinogens or promoters in the water, perhaps related to the high levels of nitrous acid resulting from the dense population of eels in culture tanks. Elevated water temperature and genetic influences were also potential factors, but the cause of this neoplasm remains unknown.

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