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Open AccessArticle

Mannanoligosaccharides as a Carbon Source in Biofloc Boost Dietary Plant Protein and Water Quality, Growth, Immunity and Aeromonas hydrophila Resistance in Nile Tilapia (Oreochromis niloticus)

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Department of Nutrition and Clinical Nutrition, Faculty of Veterinary Medicine, Zagazig University, Al Sharqia Governorate 44519, Egypt
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Departments of Microbiology, Faculty of Veterinary Medicine, Zagazig University, Al Sharqia Governorate 44519, Egypt
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Department of Biomedical and Diagnostic Sciences, University of Tennessee, Knoxville, TN 37996, USA
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Department of Pharmacology, Faculty of Veterinary Medicine, Zagazig University, Al Sharqia Governorate 44519, Egypt
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Department of Clinical Pathology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44519, Egypt
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Department of Fish Health and Management, Central Laboratory for Aquaculture Research, Agriculture Research Center, Abo Hammad 44519, Egypt
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Department of Fish Diseases and Management, Faculty of Veterinary Medicine, Zagazig University, Al Sharqia Governorate 44519, Egypt
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Department of Botany and Microbiology, Faculty of Science, Alexandria University, Moharram baik, Alexandria 21515, Egypt
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Bioproducts Research Chair, Zoology Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
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Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef 62511, Egypt
*
Authors to whom correspondence should be addressed.
Animals 2020, 10(10), 1724; https://doi.org/10.3390/ani10101724
Received: 28 July 2020 / Revised: 16 September 2020 / Accepted: 16 September 2020 / Published: 23 September 2020
(This article belongs to the Special Issue Emerging issues in Aquaculture)
Biofloc technology (BFT), offers some potential advantages for improvements in water quality and growth of farmed fish reared in recirculation systems. One practical disadvantage of implementing a BFT system to culture fish is the need to add organic carbon to maintain a C:N ratio above 10. The present study evaluated the effect of using mannan oligosaccharides as a carbon source in a biofloc system with cultivated tilapia. MOS resulted in increased lactic acid bacterial count in the water and the intestinal tract, modulated immune response and resistance against Aeromonus hydrophila and improved the survival and growth of reared Nile tilapia (Oreochromis niloticus L.)
The aim of the present study was to evaluate mannan oligosaccharides (MOS) or glycerol (GLY) as a carbon source on biofloc systems of Nile tilapia (O. niloticus) juveniles. Fish (n = 750) were reared in open flow (Controls) or biofloc systems (B-GLY and B-MOS) fed with a plant or fish protein source over a period of twelve weeks. Total ammonia nitrogen and nitrate decreased in the biofloc groups, while biofloc volume increased in B-MOS. Compared to the controls, B-MOS and B-GLY exhibited higher weight gain and improved feed conversion, irrespectively of the diet. Serum level of C-reactive protein was reduced, while IgM and lysozyme activity was higher in the B-MOS fish, compared to other groups. Intestinal Bacillus spp. count was increased, whereas Vibrio, Aeromonas and Pseudomonas spp. counts decreased in B-MOS reared groups, compared to the other groups. The proinflammatory cytokine (IL-8 and IFN-γ) transcript expression was upregulated in B-MOS more than B-GLY reared groups. Compared to the controls, the virulence of Aeromonas hydrophila was decreased in the B-MOS and B-GLY groups. The results indicate several benefits of using MOS as a carbon source in a biofloc Nile tilapia system; a cost benefit analysis is required to assess the economic viability of this. View Full-Text
Keywords: biofloc; Nile tilapia; carbon sources; plant protein; fish protein; mannanoligosaccharides; Aeromonas hydrophila; virulence gene biofloc; Nile tilapia; carbon sources; plant protein; fish protein; mannanoligosaccharides; Aeromonas hydrophila; virulence gene
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Kishawy, A.T.; Sewid, A.H.; Nada, H.S.; Kamel, M.A.; El-Mandrawy, S.A.; Abdelhakim, T.M.; El-Murr, A.E.I.; Nahhas, N.E.; Hozzein, W.N.; Ibrahim, D. Mannanoligosaccharides as a Carbon Source in Biofloc Boost Dietary Plant Protein and Water Quality, Growth, Immunity and Aeromonas hydrophila Resistance in Nile Tilapia (Oreochromis niloticus). Animals 2020, 10, 1724.

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