Several eco-friendly natural substances can enhance the shrimp immune defence system therby acting as a prophylactic agent in feed additives. Agents such as (1, 3)-(1, 6)-D β-glucan and complex mannan-oligosaccharides located in yeast cell walls present such immunomodulatory and potential prebiotic properties. The aim of our study was to evaluate the effect of a commercial yeast cell wall extract (YCW) on shrimp performance and health status, and influence on gut microbiota. Juvenile Penaeus vannamei (Boone, 1931) were raised at an intensive shrimp farm and fed with two different diet inclusions levels of YCW, that is, 0.5% and 1.0%, in addition to a yeast free control group. After 102 days, animals were sampled, and standard nutrition performance parameters were measured. Additionally, the phylogenetic profile and composition of shrimp gut microbiota were evaluated. Animal performance, including growth and survival, was significantly better on animals fed with YCW than the control group. Furthermore, beneficial bacteria phylotypes were stimulated by the presence of YCW, positively modulating the gut microbiota, with emphasis on 1.0% YCW treatment. Therefore, YCW can be regarded as a prophylactic functional agent in the intensive rearing of juvenile P. vannamei thus improving animal performance and contributing to a healthy intestinal microbiota.

中文翻译：

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通过膳食添加功能性酵母细胞壁添加剂调节太平洋白虾（南美白对虾，1931）肠道微生物群

几种生态友好的天然物质可以增强虾的免疫防御系统，从而在饲料添加剂中充当预防剂。位于酵母细胞壁中的诸如 (1, 3)-(1, 6)-D β-葡聚糖和复合甘露寡糖等试剂具有此类免疫调节和潜在的益生元特性。我们研究的目的是评估商业酵母细胞壁提取物 (YCW) 对虾性能和健康状况的影响，以及对肠道微生物群的影响。少年南美白对虾(Boone, 1931) 在集约化养虾场饲养，除了无酵母对照组外，还饲喂两种不同的 YCW 日粮含量，即 0.5% 和 1.0%。102 天后，对动物进行取样，并测量标准营养性能参数。此外，还评估了虾肠道微生物群的系统发育谱和组成。喂食 YCW 的动物的表现，包括生长和存活率，明显优于对照组。此外，YCW 的存在刺激了有益细菌的系统发育，积极调节肠道微生物群，重点是 1.0% YCW 处理。因此，YCW 可被视为集约化养殖南美白对虾幼鱼的预防功能剂。 从而改善动物的性能并有助于健康的肠道微生物群。