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Enteric redmouth disease caused by the bacterial pathogen  Yersinia ruckeri  is the main reason for antimicrobial prescription, and a cause of substantial economic losses and decreased animal welfare in aquaculture. Given the importance of the intestinal microbiota in digestion and disease, our aim was to investigate whether synbiotic feed supplementation strategies could improve feed performance and disease resistance. Four experimental synbiotic feeds formulated with pre- and probiotics were tested against a commercially available probiotic control feed. Each experimental feed was evaluated for feed performance, effects on gross as well as intestinal morphometrics, and finally their effect on resistance against a waterborne experimental infection with  Yersinia ruckeri  serotype O1, biotype 2. While co-supplementing  Pediococcus acidilactici  with citrus flavonoids or bacterial paraprobiotics significantly improved utilization of feed lipid content relative to the control group, a decrease in lipid utilization was observed for feeds that combined  P. acidilactici  with yeast paraprobiotics. No significant improvements on disease resistance were observed. Still, synbiotic formulations including  P. acidilactici  led to reduced risks relative to that of the control group, while an increased relative risk was observed for a  Bacillus -based formulation. In conclusion, two of the synbiotic supplements significantly improved lipid utilization and contributed to minor increases in disease resistance.

scientific reports

Synbiotic feed supplementation significantly improves lipid utilization and shows discrete effects on disease resistance in rainbow trout (Oncorhynchus mykiss)