Evaluation of the efficacies of selected antibiotics and medicinal plants on common bacterial fish pathogens

An experiment was conducted to compare the efficacies of some selected antibiotics and medicinal plants against common bacterial fish pathogens viz., Aeromonas hydrophila, Pseudomonas fluorescens and Edwardsiella tarda. Four different antibiotics viz., CFCIN (ciprofloxacin), Renamycin (oxytetracycline), DT-10 (doxycicline) and Sulfatrim (sulphadiazine + trimethoprim) were exposed in different doses (100, 75, 50 and 25 ppm) to the culture of freshly isolated bacteria under the in vitro condition for sensitivity test and minimum inhibitory dose (MID) was determined. Based on in vitro results, antibiotics were applied to the experimental infection of Thai silver barb, Barbonymus gonionotus. CFCIN showed the best result with 100% recoveries of challenged fish in prolonged bath treatment. Medicinal plants were selected on the basis of previous studies. Crude…