Aquafeed Vol 13 Issue 4 2021

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Yeast probiotics to boost fish gut health and improve feed efficiency Otavio Serino Castro, Nadège Richard, Phileo by Lesaffre

Gut health results from interactions of host-specific intrinsic characteristics with several factors such as environment microbiome, nutritional status, feed quality, biotic and abiotic stress. Disturbances can be hard to predict and are observed as an acute occurrence or generated after long exposure to a single or a combination of stress factors. Aquatic animals under farming conditions are constantly being exposed to stressors, with the risk to have gut health disrupted by dysbiosis caused by pathogenic bacteria, parasites, mucosa inflammatory process and impaired gut function induced by antinutritional factors, stress due to low water quality, pollutants, etc. In aquaculture, yeast postbiotics rich in bioactive compounds such as mannooligosaccharides, beta-glucans and nucleotides were subject of intense research in the past few decades, with a well-documented mode of action and benefits, especially targeting to improve innate immunity and increase disease resistance. On the other hand, feed supplementation with live yeast as a probiotic and its benefits on gut health has received less attention

A

SBM14

SBM14 + Actisaf

SBM28

SBM28 + Actisaf

Figure 1. Nile tilapia final body weight after 48 days of feeding. Means with different letter differ significantly (p < 0.05). Source: Ran et al., 2015.

and remains an area with great potential to be furthered explored.

Yeast as a probiotic Saccharomyces yeast is commonly found in marine and freshwater aquaculture environments in water, soil, plants, animals, or microorganisms. They can play different roles supporting aquatic environmental balance such as reducing ammonia, removal of toxic

B

C

Figure 2. mRNA gene expression in Nile tilapia hindgut. (A) Heat shock protein 70 (Hsp70) expression; (B) Interleukin 1 beta (il1β) expression; (C) Transforming growth factor-β expression (tgfβ). Means with different letter differ significantly (p < 0.05). Source: Ran et al., 2015.

Aquafeed: Advances in Processing & Formulation Vol 13 Issue 4 2021


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