Pathogenicity of the bacterial isolate Aeromonas hydrophila to catfishes, carps and perch

By M. Sarkar, M. Rashid. 2012

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Pathogenicity of a bacterial isolate Aeromonas hydrophila recovered from naturally diseased shing fish was investigated against catfishes (Heteropneustes fossilis and Clarias batrachus), carps (Labeo rohita, Catla catla and Cirrhinus cirrhosus) and perch (Anabas testudineus) of average body weight of 20.4 g for H. fossilis , 25.6 g for C.  Batrachus , 35.2 g for L. rohita , 25.7 g for C. catla , 30.5 g for C. cirrhosus and 20.3 g for A. testudineus . Two different  doses viz. 6.7 × 10 6 and 6.7 × 10 5 CFU/fish were injected intramuscularly. Pathogenicity of A. hydrophila was confirmed at water temperature of 30°C by mortality of 60% to 100% of all the tested fishes within 2-11 days. Injected  A. hydrophila was re-isolated from liver, kidney and intestine of all the tested fishes. The highest bacterial loads in catfishes were found to be 5.5 × 108 CFU/g in the liver of H. fossilis and 5.6 × 10 7 CFU/g in the intestine of C.  batrachus . The lowest bacterial loads were found to be 2.2 × 10 2 CFU/g in the kidney of H. fossilis and 2.4 × 10 3 CFU/g in the liver of C. batrachus . The highest bacterial loads in carps were found to be 4.9 × 10 9 CFU/g in the liver  of C. catla , 7.7 × 10 8 CFU/g in the intestine of L. rohita and 5.8 × 10 8 CFU/g in the intestine of C. cirrhosus . The   lowest bacterial loads were found to be 2.7 × 10 4 CFU/g in the kidney of C. catla , 3.0 ×10 4 CFU/g in the kidney of L   rohita and 5.6 × 10 3 CFU/g in the kidney of C. cirrhosus . The highest and lowest bacterial load in perch was found to  be 6.4 × 10' CFU/g and 1.6 × 10 2 CFU/g in the intestine and kidney of A. testudineus respectively. In all the cases of  intramuscular injection, external pathology was found. Reddish anal region and fm bases were observed. It was   understood that the isolate was a highly virulent pathogen for the challenged fishes. DOI: http://dx.doi.org/10.3329/jbau.v10i1.12108 J. Bangladesh Agril. Univ. 10(1): 157–161, 2012

Subfields: Endocrinology, Immunology, Molecular Biology

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