ANTIMICROBIAL SUSCEPTIBILITY OF VIRULENTS AEROMONAS ISOLATED FROM DISEASED FARMED TILAPIA OREOCHROMISNILOTICUS (LINNAEUS, 1758)

Bacterial isolates were collected from diseased farmed tilapia fish of the Microbiology Laboratory, Department of Fisheries and Aquaculture, Nangui Abrogoua University in Cote dIvoire. The isolated bacterial strains were identified by using biochemical identification kit API NE (Bio Merieux,France).Elevenanti microbial agentsviz.,chloramphenicol doxycycline, streptomycin, trimethoprim, nitrofurantoin, azithromycin, erythromycin,cefalexin, ampicillin, oxytetracycline and chlortetracyclin were tested by disc diffusion method. The result showed that the majority of the isolated bacteria was Aeromonashydrophila (51,3%). Regarding the sensitivity, all of the Aeromonashydrophila isolates were found sensitive to6 antimicrobial agents(chloramphenicol, doxycycline, streptomycin, trimethoprim, nitrofurantoin, azithromycin). But, 81,8% of the isolates were found moderately sensitive to oxytetracycline. In addition, 100% isolates exhibited resistance to ampicillin and cefalexin. It is notable that there were large numbers of antimicrobial agents sensitive fish pathogenic bacteria in tilapia fish, which showed that the antimicrobial agents represent the weapon of choice against bacterial infections.The use of antimicrobial agentsshould take place under well-defined conditions approved by the relevant public health body.