| Summary: | Aeromonas salmonicida is a Gram-negative bacteria that are pathogenic to
fresh water and sea water fish, can cause furunculosis and mortality, impact on
economic losses. This study aimed to determine the sensitivity of the isolates of
Aeromonas salmonicida isolated from nile tilapia (Oreochromis niloticus) to some
of antibiotics.
Three isolates of Aeromonas salmonicida tested for its sensitivity level
using the Kirby-Bauer disk diffusion method on Mueller Hinton Agar as the
media. Ampicillin disk, doxycycline disk, eryhtromycin disk, enrofloxacin disk,
and gentamicin disk, using tweezers, positioned on the surface of bacterial culture,
and then incubated for 24 hours at 28oC. The diameter of zones of inhibition
around the antibiotic disk that formed being compared to the Kirby-Bauer
stanbard.
The result show that three isolates of Aeromonas salmonicida sensitive to
ampicillin (33,3%), doxycycline (33,3%), enrofloxacin (100%), and gentamicin
(100%), intermediet to doxycycline (66,7%) and erythromycin (100%), and
resistant to ampicillin (67,7%). Based on the zones of inhibition were formed,
enrofloxacin and gentamicin are effective for treating infections caused by
Aeromonas salmonicida in nile tilapia.
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