Growth and Antibiotic Sensitivity Status of Bacillus spp. associated with Abalone (Haliotis asinina) as Probiotic Candidate Selection

The use of probiotics is an innovation in effort to increase production and fight pathogens aquaculture cultivation environments. Probiotic candidate microorganisms are selected selectively ensure that the used safe provide benefits for host environment. This study aims select probiotic candidates based on aspects growth sensitivity antibiotics from 4 isolates Bacillus abalone (Haliotis asinina). Growth observations were carried out by turbidimetric method using a spectrophotometer at wavelength 600 nm SWC media, antibiotic was tested Rifampicin, Gentamicin, Kanamycin, Erythromycin well-diffusion agar method. analysis described curve OD value, susceptibility diameter inhibition zone. results showed four spp. had short lag phase, ranging 1-2 hours, exponential phase 15 hours B. pumilus SLK1 licheniformis SLK2 isolates, 12 coagulans CaK1 CaK6 isolates. Antibiotic sensitive all antibiotics, while SLK2, only Rifampicin Gentamicin antibiotics. ideal isolate with good does not have resistance properties, this has potential as