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The bacterial flora in the digestive tract of chum salmon growing in fresh water under defined and controlled culture conditions was examined both qualitatively and quantitatively. The predominant species present in the digestive tract were identified asAeromonas , withAeromonas hydrophila being the most common isolate. These aeromonads were not isolated from the diet. Other bacterial species commonly isolated includedBacillus, Enterobacter , nonpigmented pseudomonads,Micrococcus , andAcinetobacter . These species were also isolated from the diet or tank water. As many as 108 viable bacteria per g (wet weight) of digestive tract plus contents were counted. After 75 days of starvation, 106 viable bacteria were counted, whereas fish fed a sterile feed contained 105 viable bacteria per g (wet weight) of digestive tract plus contents.

Faculative Anaerobic Bacteria in the Digestive Tract of Chum Salmon ( Oncorhynchus keta ) Maintained in Fresh Water Under Defined Culture Conditions