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ARTICLE INFO A study was conducted to investigate the pathogenicity and the median lethal dose (LD50) of Aeromonas hydrophila isolated from clinically diseased catfish against apparently healthy homologous fish to evaluate the lethality of extra-cellular products (ECPs) of the isolated strain in vivo. For pathogenicity experiment, five different concentrations of Aeromonas hydrophila strain BNS 01614 including 3× 10 8 , 1.5 × 10 8 , 1.5 × 10 7 , 1.5 × 10 6 and 1.5 × 10 5 CFU/fish used via intra peritoneal. The results revealed that pathogenicity of BNS 01614 was confirmed by the mortality of 30 % to 100 % of all tested fish within 4 to 12 days with LD50 1.5 × 10 7 CFU/fish. The Concentrated extracellular products (ECPs) of the selected bacterium were prepared and confirmed to be toxic in Clarias garipineus with LC50 of 20μg. Article history:

journal of veterinary medical research/journal of veterinary medical research 

Pathogenicity of Aeromonas hydrophila isolated from diseased sharp teeth catfish, Clarias gariepinus, with special reference to the lethality of its extracellular products