Effects of reducing dietary fishmeal with yeast supplementations on Litopenaeus vannamei growth, immune response and disease resistance against Vibrio harveyi

Effect of yeast hydrolysate supplementation on the resistance of Pacific white shrimp, Litopenaeus vannamei , challenged with low salinity stress

“…Although the SOD activity was reduced, it was higher than that of the YH0 group at 0 h. Yeast hydrolysate contains immunostimulants such as β-glucan, mannan oligosaccharides and yeast nucleotides, which has a positive effect on the non-specific immunity of L. vannamei. In the previous studies, dietary yeast hydrolysate could increase the PO and SOD activities of L. vannamei (Chi et al, 2016) and diet with yeast supplementations improved the resistance of shrimp to Vibrio harveyi (Ayiku et al, 2020). Our results indicated that yeast hydrolysate might have a positive effect on SOD activities of L. vannamei and thus enhance the resistance to low salinity stress.…”

“…In the previous studies, dietary yeast hydrolysate could increase the PO and SOD activities of L . vannamei (Chi et al, 2016) and diet with yeast supplementations improved the resistance of shrimp to Vibrio harveyi (Ayiku et al, 2020). Our results indicated that yeast hydrolysate might have a positive effect on SOD activities of L .…”

Dietary yeast culture facilitates the growth, immune response, digestive enzyme activity, intestinal microbiota and disease resistance against Vibrio harveyi of hybrid grouper ( Epinephelus fuscoguttatus ♀ × Epinephelus lanceolatus ♂)

“…When hepatocytes are damaged, hepatocyte membrane permeability is increased, inducing the release of ALT and AST into the bloodstream and thus causing significant serum enzyme activity changes (Hassaan et al, 2018). The present study demonstrated that the addition of YC to the diet decreased the activities of AST and ALT, indicating that YC exerted a protective effect on the liver against free radical damage, which was consistent with existing studies’ findings (Ayiku et al, 2020a,2020b).…”

“…Therefore, it was suggested that improving feed utilization could be one of the important ways for YC to promote the growth of hybrid groupers. Accumulating studies have shown that the addition of 2% YC to the feed can significantly reduce the FCR of Litopenaeus vannamei (Ayiku et al, 2020b), and moreover, the addition of 1% and 2% brewer's yeast feed notably improves the feed efficiency of bass ( Morone chrysops × Morone saxatilis ) (Li et al, 2004), which may be due to the contribution of yeast cells and extracellular metabolites (proteins, amino acids, vitamins, nutrient metabolites and enzymes) in YC. These substances can enhance the activity of digestive enzymes and facilitate the absorption and metabolism of nutrients, thus promoting growth (Ayiku et al, 2020a; Gao et al, 2008).…”

“…The liquid fermentation broth was mixed with the solid medium seeded with Aspergillus niger, and the fermentation product was dried to produce a yeast culture. The YC used in the present study was the same as that used by Ayiku et al (2020b). The nutrient composition was given with reference to the literature of Ayiku et al (2020b).…”