Antibacterial Abilities of Intestinal Microflora of the River Fish

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  • Antibacterial Abilities of Intestinal M

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Abstract

Bacterial strains were isolated from the intestinal tract of river fish and the environmental water and sediment, and examined for their antibacterial abilities against Aeromonas hydrophila ATCC 7966, A. salmonicida ATCC 33658, Escherichia coli IAM 1264 and Staphylococcus aureus ATCC 25923 using a double agar-layer method. A total of 940 isolates including aerobic and anaerobic bacteria were classified into 13 taxonomic groups. Almost all specimens of carp and crucian carp harbored Aeromonas, Enterobacteriaceae and Bacteroidaceae (including Bacteroides type A) as predominant intestinal microflora. All fish specimens harbored the bacteria with antibacterial abilities. An average of 2.1% of tested strains exhibited antibacterial activity against the four target strains, but the activity varied with fish species, intestinal segments and sampling times, along with taxonomic groups of tested bacteria. The target strains were inhibited mainly by the predominant microflora of fish intestines: 3.2-10.3% of strains belonging to Bacteroides type A and other Bacteroidaceae inhibited the growth of A. salmonicida ATCC 33658 while 3.1-7.4% of strains of genus Aeromonas exhibited the inhibitory effect against E. coli IAM 1264 and S. aureus ATCC 25923. These results may suggest that these bacteria affect the composition of intestinal microflora of river fish, to some extent, by producing antibacterial substances.

Journal

  • Fisheries science

    Fisheries science 63 (3), 378-383, 1997

    The Japanese Society of Fisheries Science

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