Abstract: The present product (“invention”) corresponds to a new strain of Bacillus subtilis NRRLB-50213 which produces secondary metabolites, bioactive substances and biodegrading enzymes. This strain of bacteria and/or its derivatives has/have the capacity to form functional feeds with high starch and/or soy flour content, as well as inhibiting the growth of pathogenic microorganisms. Functional feeds formulated with the NRRLB-50213 strain and high concentrations of vegetable flours have the capacity to generate growth, weight gain and survival equal to or greater than those generated by feeds which contain high fish flour or other animal protein content. Included in this invention are methods and formulas which increase growth, weight gain and survival percentage, since the decomposition and assimilation of formulated functional nutrients based on vegetable flour and the NRRLB-50213 strain of Bacillus subtilis are improved and maximized.