The Journal of General and Applied Microbiology
Online ISSN : 1349-8037
Print ISSN : 0022-1260
Specific probiotic characterization of Weissella hellenica DS-12 isolated from flounder intestine
Yimin CaiYoshimi BennoTakashi NakaseTae-Kwang Oh
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1998 Volume 44 Issue 5 Pages 311-316

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Abstract

A total of 199 microorganisms were isolated from the intestinal contents of flounder (Paralichthys olivaceus) in a fish farm in Seoul, Korea. Among these strains, DS-12 was selected as a candidate for flounder probiotics because of its excellent exhibition of antimicrobial activity against fish pathogens such as edwardsiella, pasteurella, aeromonas, and vibrio, and initiate growth in 10% NaCl, 10% bile, and in broth at pH 3 for 90 min. This strain was Gram-positive, and catalase-negative coccoid rods that produced gas from glucose and formed more than 90% of lactate as the D(−) isomer. This organism is positioned at a cluster in the genus Weissella on the phylogenetic tree based on 16S rRNA sequences, which were assigned to Weissella hellenica on the basis of DNA-DNA relatedness. However, the type strain of W. hellenica JCM 10103T had no antibacterial activity against the fish pathogenic bacteria and was found to be quite different from the DS-12 strain in some sugar fermentation patterns of α-methyl-D-glucoside, esculine, cellobiose, melibiose, D-raffinose, and D-turanose, being especially unable to grow at 15 and 35°C in 7% NaCl and 10% bile. The results obtained in the present study demonstrated that the type strain of W. hellenica had no probiotic characteristics, but the strain DS-12 could be used as a specific probiotic for flounder.

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© 1998 by The Applied Microbiology, Molecular and Cellular Biosciences Research Foundation
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