Aeromonas septicemia and columnaris disease are major bacterial diseases in grass carp; however. the drugs currently used to control these diseases pose environmental and health risks. This study aimed to screen for a probiotic Bacillus strain with antagonistic activity to prevent and control bacterial diseases in grass carp and to evaluate the antimicrobial activities. biosafety. https://unitedssports.shop/product-category/goalie-chest-protectors-junior/