Effects of dietary β-glucan and glycyrrhizin on non-specific immunity and disease resistance of white shrimp, Litopenaeus vannamei (Boone) challenged with Vibrio alginolyticus

The white shrimp Litopenaeus vannamei, fed immunostimulant-free, 0.2%β-glucan and 0.06% glycyrrhizin diets for 18 days, respectively, were challenged with Vibrio alginolyticus at 6.4 × 104 CFU shrimp−1. The total haemocyte count (THC), phenoloxidase (PO) activity, respiratory burst (RB) and superoxide dismutase (SOD) activity changes for a 120-h period were investigated, and shrimp mortality was also recorded. The results showed that PO...