Improving tilapia (Oreochromis mossambicus) resistance to streptococcal disease by improving the gut biome through administration of the microorganisms Bacillus subtilis and Enterococcus faecalis

Abstract

The destruction of microbial communities within the gut of farmed tilapia (Oreochromis mossambicus) by Streptococcus agalactiae infection can result in considerable impacts to the health of the host. It is necessary to find a more effective treatment to improve the gut biome of farmed tilapia. We applied a tilapia culture method incorporating microorganisms in the diet and tracked gut bacteria over a 15-week period. A model of S. agalactiae infected individuals was constructed by detecting blood parameters and actual observation. Good’s coverage index (> 0.98) and 60 %) were higher than CGs. The application of the combined microorganisms within the diet of cultured O. mossambicus may therefore benefit their health by promoting a gut microbiome of greater diversity and increasing their resistance to disease.

Keywords

• Tilapia (Oreochromis mossambicus)
• Microorganisms
• Gut microbiome
• Streptococcus agalactiae