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Appl Environ Microbiol. 1992 February; 58(2): 551-556

Intestinal colonization potential of turbot (Scophthalmus maximus)- and dab (Limanda limanda)-associated bacteria with inhibitory effects against Vibrio anguillarum.

Department of General and Marine Microbiology, University of Göteborg, Sweden.

ABSTRACT

Of more than 400 bacteria isolated from turbot (Scophthalmus maximus), 89 have previously been shown to inhibit the in vitro growth of the fish pathogen Vibrio anguillarum. The aim of the present study was to investigate the potential of seven of these strains, as well as of intestinal isolates (four strains) from a closely related fish, dab (Limanda limanda), for colonizing farmed turbot as a means of protecting the host from infection by V. anguillarum. In addition, the inhibitory effect of these strains on the pathogen was further studied. Colonization potential was measured by the capacity of the strains to adhere to and grow in turbot intestinal mucus. These parameters were also used to investigate the potential of V. anguillarum to amplify in the turbot intestinal tract. Because of the observed rapid growth of V. anguillarum in intestinal mucus, it can be proposed that the intestinal tract is a site for V. anguillarum multiplication. Strains isolated from the intestine showed greater capacity for adhesion to and growth in fish intestinal mucus than did the pathogen and the skin mucus isolates. All of the isolates released metabolites into the culture medium that had inhibitory effects against V. anguillarum. The results are discussed with emphasis on administering bacteria of host origin to farmed turbot in order to control V. anguillarum-induced disease.

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