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Susceptibility of six bacterial pathogens of channel catfish to six antibiotics






Journal of Aquatic Animal Health 7(3): 211-217

Susceptibility of six bacterial pathogens of channel catfish to six antibiotics

Two hundred eight bacterial isolates from diseased channel catfish Ictalurus punctatus were screened for susceptibility to apramycin, enrofloxacin, cephalothin, oxytetracycline, sulfadimethoxine-ormetoprim, and tilmicosin by the Kirby-Bauer disk diffusion method. Bacteria evaluated were Edwardsiella ictaluri, E. tarda, Acromonas sp., A. hydrophila, A. sobria, and Pseudomonas sp. All bacteria were most susceptible to enrofloxacin (99.0%) and apramycin (97.6%), but only 86.5% were susceptible to sulfadimethoxine-ormetoprim, 84.1% to oxytetracycline, and 75.5% to cephalothin. Edwardsiella ictaluri, E. tarda, A. hydrophila, and A. sobria were 100% susceptible to enrofloxacin. Aeromonas sp., E. ictaluri and E. tarda were 100% susceptible to apramycin. Resistance was detected in all bacterial species to cephalothin, oxytetracycline, sulfadimethoxine-ormetoprim, and tilmicosin. Testing E. ictaluri against sulfadimethoxine-ormetoprim gave larger zones of inhibition on Mueller-Hinton medium than on brain-heart infusion agar.

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Accession: 002973374

DOI: 10.1577/1548-8667(1995)007<0211:sosbpo>2.3.co;2



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