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An accidental discovery of mannan-oligosaccharide’s protection effect against air exposure and its potential mechanism in hybrid grouper (Epinephelus lanceolatus ♂ × Epinephelus fuscoguttatus ♀)

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Abstract

The original objective was to explore the potential benefiting effects of three prebiotics in hybrid grouper (Epinephelus lanceolatus♂ × Epinephelus fuscoguttatus♀). Therefore, three experimental diets (basal diet + 1% fructooligosaccharide, Diet F; basal diet + 1% inulin, Diet I; basal diet + 0.3% mannan-oligosaccharide, Diet M) and one basal diet (Diet C) were prepared and a feeding trial was conducted. However, at the end of the fourth week into the feeding experiment, a water-leaking accident occurred and fishes of all groups went through an unexpected air exposure event. Surprisingly, different prebiotic-supplemented groups showed significantly different air exposure tolerance: the mortality of M group was significantly lower (P ≤ 0.05) than all the other groups. Examination of antioxidant, non-specific immunity, and stress parameters revealed that comparing to control group, M group showed significantly increased catalase (CAT), acid phosphatase (ACP), and alkaline phosphatase (AKP) activities, decreased superoxide dismutase (SOD) activity, and similar cortisol level (P ≤ 0.05). Real-time PCR experiment revealed that M group significantly increased the expression of CAT, glutathione peroxidase (GPx), and manganese superoxide dismutase (MnSOD) genes in head kidney (P ≤ 0.05). Overall, M exhibited the best anti-air exposure/antioxidative stress effects among the three prebiotics and could be considered a promising feed additive to relieve air exposure/oxidative stress in hybrid grouper culture.

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All data generated or analyzed during this study are included in this article and its supplementary information files. Raw data are available from the authors upon reasonable request.

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Funding

This study was funded by the National Natural Science Foundation of China (No. 31860739, 42066007), Major Science and Technology Projects in Hainan Province (No. ZDKJ2019011).

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SW and LT designed and carried out majority of the experiments and drafted the article. YW participated in aquaculture experiment, sample collecting. BG participated in aquaculture experiment, and sample collecting. YC helped design the experiments, provided funding support and was involved in writing-review and editing. JL participated in data collecting and analyzing. YZ provided funding and was involved in writing-review and editing. All authors read and approved the final manuscript.

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Correspondence to Yan Cai.

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This animal experiment was reviewed and approved by the Hainan University Institutional Animal Use and Care Committee, China (approval number: HNUAUCC-2020–00011). The animal experiments strictly abide by the principles of experimental animal welfare ethics, and accept the supervision and inspection of the Hainan University Institutional Animal Use and Care Committee.

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The authors declare no competing interests.

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Wang, S., Tian, L., Wu, Y. et al. An accidental discovery of mannan-oligosaccharide’s protection effect against air exposure and its potential mechanism in hybrid grouper (Epinephelus lanceolatus ♂ × Epinephelus fuscoguttatus ♀). Fish Physiol Biochem 48, 1285–1297 (2022). https://doi.org/10.1007/s10695-022-01118-9

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  • DOI: https://doi.org/10.1007/s10695-022-01118-9

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