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Characterization of the skin and gill microbiomes of the farmed seabass (Dicentrarchus labrax) and seabream (Sparus aurata)

Rosado, Daniela, Perez-Losada, Marcos, Severino, Ricardo, Cable, Joanne and Xavier, Raquel 2019. Characterization of the skin and gill microbiomes of the farmed seabass (Dicentrarchus labrax) and seabream (Sparus aurata). Aquaculture 500 , pp. 57-64.

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There is substantial evidence showing that the microbiome of teleosts plays a key role in host health and wellbeing. Aquaculture practices increase the risk of dysbiosis (i.e. microbial imbalance), which is known to facilitate pathogen infections. The skin and gills are the primary defense organs against pathogens, thus, characterizing their microbiome composition in farmed fish is pivotal for detecting potential alterations that may lead to disease susceptibility. Here, we assessed the skin and gill microbiomes of two of the most important adult fish species farmed in southern Europe, the seabass and the seabream, during winter months. We coupled next-generation sequencing (MiSeq) of the 16S rRNA V4 region with the DADA2 bioinformatic pipeline to assess microbial composition and structure. Variation in microbial alpha-diversity (intra-sample) and taxa proportions were assessed using analysis of variance. Differences in beta-diversity (between-sample) were tested using permutational multivariate analysis of variance. Microbiomes of both tissues (n = 30 per species) identified 19 bacteria phyla, dominated by the phyla Proteobacteria (44–68%) and Bacteroidetes (15–37%); the families Flavobacteriaceae (11–28%), Rhodobacteraeae (4–8%) and Vibrionaceae (2–17%); and the genera Rubritalea (4–13%), Pseudomonas (4–8%) and the NS3a marine group (4–12%). Mean relative proportion of these taxa, some alpha-diversity indices and all beta-diversity distances varied significantly between tissues within and between species. ASVs belonging to the genera Polaribacter and Vibrio, which include several species that are pathogenic, were detected in the core microbiomes of seabass or seabream.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Elsevier
ISSN: 0044-8486
Date of First Compliant Deposit: 2 October 2018
Date of Acceptance: 28 September 2018
Last Modified: 17 Oct 2019 15:39

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