Evaluation of the culture conditions in a stirred tank bioreactor and the probiotic potential of a Lactococcus lactisstrain isolated from the gastrointestinal tract of Nile tilapia (Oreochromis niloticus)

Abstract

En la aquicultura han adoptado un papel muy importante los probióticos, pero su producción contiene grandes retos. El objetivo de este trabajo fue evaluar el efecto del estrés hidrodinámico del potencial probiótico Lactococcus lactis para su uso en acuicultura de tilapina nilótica (Oreaochromis niloticus)

Fisheries have adopted an important role in food production due to the high productivity and quality of products. Nowadays, Tilapia is the second most farmed fish in the world, but diseases due to intensive farming have generated a lot of economic losses. These diseases have been traditionally treated with antibiotics, but this is not sustainable over time, hence leading to the investigation of new alternatives, such as probiotics, and the microorganisms present in the host’s gut are of high interest given that specific species of microorganisms adapt to the appropriate host. The research group “Grupo de Investigación de procesos agroindustriales” (GIPA) has isolated the microorganism Lactococcus lactis A12 from the gastrointestinal tract of commercial tilapia. Lactococcus lactis has shown in some investigations to be of interest for its use as probiotic in aquaculture. The purpose of this study was to establish the best culture conditions for L. lactis A12 growth with its probiotic activity active. For this, tests were carried out to determine the effect of hydrodynamic stress on the production of viable biomass and on the probiotic activity of the microorganism.