Table 1. Composition of each feed group used in the experimental setup.

Group designation	Content
Control-Base feed	48% protein, 23% fat, 20 MJ/kg, 35% marine content, 26% fishmeal
β-glucan	Base feed supplemented with β-glucans, vitamins C + E and nucleotides
β-glucan + OA	Base feed supplemented with β-glucans and organic acids, vitamins C + E and nucleotides
CF	Base feed supplemented with citrus flavonoids, vitamins C + E and nucleotides
YCW	Base feed supplemented with yeast cell wall extract vitamins C + E and nucleotides