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Appl Environ Microbiol. 1975 May; 29(5): 663-668
Copyright © 1975 American Society for Microbiology. All Rights Reserved.

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

Department of Bacteriology and Biochemistry, University of Victoria, Victoria, British Columbia, Canada

ABSTRACT

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 as Aeromonas, with Aeromonas hydrophila being the most common isolate. These aeromonads were not isolated from the diet. Other bacterial species commonly isolated included Bacillus, Enterobacter, nonpigmented pseudomonads, Micrococcus, and Acinetobacter. 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.