Fig. 2. Lysozyme activity in the skin mucus of Caspian white fish (Rutilus frisii kutum)
fry fed different levels (0% [control], 0.25%, 0.5, 1% and 2%) of dietary sodium propionate
for 7 weeks. Bars assigned with different superscripts are significantly different
(P < 0.05); Values are presented as the mean þ SE.