Bacteriological Studies of Freshwater Fish: II. Furunculosis in Ontario Fish in Natural Waters

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Abstract
During a period of 29 months, 1044 fish were taken from different sections of 10 streams in southern Ontario and examined for the presence of Aeromonas salmonicida, the bacterium causing furunculosis in fish. Most of the fish examined were brook trout (Salvelinus fontinalis), and carriers of furunculosis were, with one exception, found only in this species of fish. The one exception was a sculpin (Cottus bairdi). Most of the brook trout found to be carriers were taken from the same section of the Beaver River. As yet, no explanation can be given of the high incidence of furunculosis carriers in these waters, nor is their importance known.

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