Seasonal changes in the normal bacterial flora of fresh-water fish

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Abstract
1. Bacteriological examination of large samples of Perch and Powan from natural and artificial waters has shown that a considerable decline in the normal bacterial flora of the fish occurs during the summer months. Reinfection occurs when the temperature falls.2. These variations are largely attributable to the effect of temperature upon the immunological responses of the fish.3. The bacteria concerned appear to be water bacteria, which invade the muscles and body cavity of the fish, as well as the gill and gut-content.4. The degree of infection is also influenced by the bacterial content of the water.

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