Anto Bact is a combination of highly concentrated microbial mixture which is specifically designed for vannamei hatchery. It contains selected effective strains of Bacillus Subtilis, B. coagulans, B. cereus, B. amyloliquefaciens, B. clausii, B. pumilus, B. licheniformis, B. polyfermenticus, Lactobacillus acidophilus, L. casei, L. lactis, L. rhamnosus, Bifidobacterium bifudum, B. animalis, Pediococcus acidilactici with suitable enzyme combinations. Anto Bact can multiply fast and produce exoenzymes which can help digestion, prevent pathogenic bacterial colonization. Anto Bact gives competitive inhibition by producing secondary metabolite that inhibits the growth of pathogen. It protects the gut environment and improves conversion.