Antimicrobial Susceptibility of Flavobacterium psychrophilum Isolated from Rainbow Trout (Oncorhynchus mykiss)

This study was conducted to determine antibiotic susceptibility of Flavobacterium psychrophilum isolated in diseased rainbow trout (Oncorhynchus mykiss) from two hatcheries the Mediterranean region Turkey. The samples were taken kidney and spleen for bacteriology juveniles (weight 0.7-1 g) April isolates obtained on tryptone yeast extract salts (TYES) agar medium at 15°C 72 hours. Fourteen identified as F. using biochemical, physiological, morphological characteristics API ZYM test. Antibiotic sensitivities determined by disc diffusion method TYES agar, results evaluated according CLSI standards. Only one isolate each hatchery used antibiogram Both sensitive amoxicillin/clavulanic acid 2:1, penicillin, nitrofurantoin, florfenicol, amoxicillin, clindamycin, chloramphenicol, ampicillin, doxycycline, streptomycin, erythromycin; resistant sulfadiazine, sulfamethoxazole/trimethoprim, oxolinic acid, vancomycin, trimethoprim/sulfadiazine, gentamicin, kanamycin, nalidixic oxacillin, enrofloxacin, flumequine, tobramycin. show that isolating performing antimicrobial testing is important issue disease control.