Antibiotic Resistance of Bacterial Species Isolated from Diseased Goldfish, Carassius auratus

Abstract

The antibiotic resistance test of bacterial species isolated from diseased goldfish, Carassius auratus was determined by disk diffusion method. Total 41 strains were identified into 5 species including Aeromonas hydrophila, Erwinia spp., Pasteurella pneumotropica, Pantoea spp. and Proteus panneri. Twelve antibiotics were investigated namely amoxycillin, ampicillin, chloramphenicol, ciprofloxacin, erythromycin, enrofloxacin, novobiocin, norfloxacin, oxytetracyline, oxolinic acid, doxycycline and tetracycline. Thirty strains of A. hydrophila were resistant to amoxycillin and ampicillin (100%), novobiocin (83.33%), erythromycin and oxolinic acid (66.67%), oxytetracyline and tetracycline (50%), chloramphenicol and doxycycline (33.33%), ciprofloxacin and norfloxacin (16.67%), and enrofloxacin (13.33%, respectively. Erwinia spp. and P. panneri were resistant to all antibiotics. Furthermore, Pantoes spp. and P. pneumotropica were highly resistant patterns against antibiotics. However, enrofloxacin was an effective drug against A. hydrophila, Erwinia spp. and P. panneri. From this result, it could be concluded that all bacterial strains isolated from diseased goldfish showed multi-resistance to antibiotics.