Abstract
Serious outbreaks of a pernicious disease caused by the fungus Dermocystidium are reported in both adult and juvenile salmon in the Columbia River and its tributaries. The disease evokes a characteristic histopathology and appears to cause death in a large percentage of the infected fish. The disease appears to be most virulent at water temperatures below 60 F. Some prophylactic relief is given by treatment with the organic herbicide, Diquat, at a dilution of 1:500,000 for 1 hr.
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