Abstract
This study aimed at assessing the effect of short-chain fructooligosaccharides (scFOS), xylooligosaccharides (XOS), and galactooligosaccharides (GOS) on European sea bass juveniles gut microbiota. Four practical diets were formulated with fish meal (FM) and plant feedstuffs (PF) as protein sources (circa 30:70 of protein from FM:PF) and to include 1% of α-cellulose (control diet, CTR), or 1% of scFOS, XOS, or GOS (diets FOS, XOS, and GOS, respectively). Triplicate groups of fish with 79 g were fed with the experimental diets during 30 days. Gut content was sampled at days 7 and 30 for allochthonous microbiota characterization. Lactobacillus, Pseudomonas, Vibrio, and Burkholderia were the main genera found in fish gut. Gut allochthonous microbiota presented an increased number of operational taxonomic units (OTUs) and a higher Margalef index of bacterial richness in fish fed scFOS and XOS. Gut allochthonous microbial OTUs, Margalef species richness index, Shannon’s diversity index, and SIMPER similarity were unaffected by sampling day. In conclusion, scFOS and XOS modulated European sea bass gut microbial community and this effect persisted throughout time. These changes in gut microbiota composition contribute to explain the positive effects on growth performance, immune status, and lipid and glucose metabolism previously reported in European sea bass fed with scFOS and XOS.
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Acknowledgements
We would like to express our thanks to P. Correia for the assistance during the trial. Authors would also thank Jefo Species-specific additives France, for providing the scFOS.
Funding
This work was partially funded by Projects AQUAIMPROV (reference NORTE-07-0124-FEDER-000038) and Pest-C/MAR/LA0015/2013 and UID/Multi/04423/2013, co-financed by the North Portugal Regional Operational Programme (ON.2-O Novo Norte), under the National Strategic Reference Framework (NSRF), through the European Regional Development Fund (ERDF), and through the COMPETE-Operational Competitiveness Programme and national funds through FCT-Foundation for Science and Technology, respectively. I. Guerreiro and P. Enes were supported by FCT grants (SFRH/BD/76139/2011 and BPD/39688/2007, respectively). C. Serra was recipient of a grant within the Project AQUAIMPROV (NORTE-07-0124-FEDER-000038).
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Guerreiro, I., Serra, C.R., Oliva-Teles, A. et al. Short communication: gut microbiota of European sea bass (Dicentrarchus labrax) is modulated by short-chain fructooligosaccharides and xylooligosaccharides. Aquacult Int 26, 279–288 (2018). https://doi.org/10.1007/s10499-017-0220-4
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DOI: https://doi.org/10.1007/s10499-017-0220-4