Please find some interesting informations in litterature: Dietary supplementation with Bacillus subtilis, Saccharomyces cerevisiae and Aspergillus oryzae enhance immunity and disease resistance against Aeromonas hydrophila and Streptococcus iniae infection in juvenile tilapia Oreochromis niloticus. Fish Shellfish Immunol. 2015 Mar;43(1):60-6.Iwashita MK et al. 2015.
Check the direct link: https://www.ncbi.nlm.nih.gov/pubmed/25530581