Figure 2

The lactic acid concentration in fresh chyme along the gastrointestinal tract of Nile tilapia. (a) The main effect of probiotics supplementation on the lactic acid concentration. (b) The main effect of enzyme supplementation on the lactic acid concentration. Error bars indicate standard error of means; *P < 0.05; **P < 0.01. CON-PRO, probiotics added; ENZ-CON, enzymes added; ENZ-PRO, enzymes and probiotics added.