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Prebiotic (A-Max) and Growth of Juvenile Rainbow Trout (Oncorhynchus mykiss)

A 48-d feeding experiment was conducted to evaluate the effects of the commercial prebiotic A-Max, a mixture of mannan oligosaccharides, fructo oligosaccharides, and β glucan, on the growth performance, survival, body composition, stress resistance, and serum biochemical parameters of juvenile rainbow trout, Oncorhynchus mykiss. A basal diet was supplemented with 0 (control), 0.5, 1.0, and 1.5 g kg−1 A-Max. Juveniles fed 1.5 g kg−1 A-Max displayed significantly higher final weight (FW), weight gain (WG), protein efficiency ratio (PER), biomass gain, and significantly lower feed conversion ratio (FCR) compared with the control group (P < 0.05). There was no significant difference in survival rate among groups (P > 0.05). At the end of the trial, lipid carcass was significantly lower in 1.0 g kg−1 A-Max (P < 0.05); body protein was not affected by diet (P > 0.05). Survival of alkalinity (P < 0.05) challenges was highest in fish fed the diet supplemented with 1.5 g kg−1 A-Max. Serum total protein, albumin, and glucose were not significantly affected by dietary A-Max (P > 0.05).