Dietary beta-glucan and nucleotide effect on growth, survival and immune responses on Pacific white shrimp, Litopenaeus vannamei.

摘要

Effects of dietary supplementation of o-glucans and nucleotides on growth, survival and immune responses of the Pacific white shrimp (Litopenaeus vannamei) at a low salinity (5 ppt) were evaluated during a 30 d feeding trial. Final mean weight of shrimp fed nucleotides at 0.5% was highest and significantly different from those fed the basal diet or diets supplemented with o-glucans. Survival was significantly higher for shrimp fed the diet with 0.2% o-glucans compared to all other diets and was lowest for shrimp fed the basal diet. Shrimp fed diets containing o-glucans and nucleotides had generally better immune responses than shrimp fed the basal diet with higher total hemocyte count (THC) recorded for shrimp fed 0.2% o-glucans followed by those fed 0.2% nucleotides. Shrimp fed diets with 0.2% and 0.5% nucleotides and 0.2% o-glucans had significantly higher respiratory burst values than shrimp fed the basal diet. These results indicated that dietary supplementation of either nucleotides or o-glucans has beneficial effects in improving shrimp performance when cultured at low salinity.