article · Aquaculture Reports
This study investigated the effects of dietary mannanoligosaccharide (MOS) on red sea bream over 60 days, using five different MOS levels. Supplementation significantly improved growth performance, including final body weight, weight gain, and specific growth rate, while reducing the feed conversion ratio, particularly at 1.5 g/kg. MOS also enhanced various immune parameters in the fish's serum and mucus, such as hematocrit, total serum protein, lysozyme, and bactericidal activity. Furthermore, it improved the fish's antioxidative response and increased tolerance to low salinity stress. The findings suggest that MOS, administered at 1.5–2 g/kg, can boost growth, immune function, and stress resistance in red sea bream.
This research is important for sustainable aquaculture, as it identifies a dietary supplement that can make farmed fish healthier and more resilient. By improving growth, immunity, and stress tolerance, MOS could help reduce losses, improve animal welfare, and increase the efficiency of red sea bream farming, benefiting producers and consumers.
This research indicates that mannanoligosaccharide (MOS) could be developed as a feed additive for the aquaculture industry. Fish farmers and feed manufacturers could use this to produce healthier, faster-growing red sea bream with enhanced disease resistance and stress tolerance. The findings are from an applied study, suggesting this technology is ready for further development and field trials to validate its efficacy in commercial farming conditions.
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The current study evaluated the effects of dietary mannanoligosaccharide (MOS) on red sea bream (Pagrus major) performances. Fish fed five dietary levels of MOS at 0, 0.5, 1, 1.5 or 2 g/kg for 60 days. The results showed that MOS supplementation significantly increased the final body weight, weight gain, and specific growth rate with decreased feed conversion ratio especially in fish fed 1.5 g per kg diet (P < 0.05). The hematocrit level was significantly increased in fish fed dietary MOS at 1.5 g/kg while, total serum protein increased in fish fed MOS at 1 or 1.5 g/kg in comparison with the control. However, glutamic pyruvic transaminase (GPT) was significantly decreased in fish fed dietary MOS at 0.5, 1 or 2 g/kg when compared to the other groups. The combined pattern of biological antioxidant potential (BAP) and reactive oxygen metabolites (d-ROMs) indicated that fish showed improved antioxidative response with higher BAP value in fish fed MOS at 0.5, 1 or 2 g/kg than the control group. The activities of lysozyme, bactericidal and peroxidase in serum and mucus of fish fed MOS diets increased over the control. Additionally, blood nitro blue tetrazolium assay (NBT) and alternative complement pathway (ACH50%) were increased significantly in fish fed on MOS over the control regime. Interestingly, fish fed MOS at 0.5, 1 or 2 g/kg exhibited higher tolerance against low salinity stress as compared to the control group. In conclusion, MOS administered as feed supplement at 1.5–2 g/kg enhances the growth performance, rises the levels of serum and skin mucus immune responses and increases the activity of antioxidant enzymes in red sea bream.
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DOI: 10.1016/j.aqrep.2020.100278
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