Gadoin E. auteur aut IRD Desnues C. auteur aut IRD D'Orbcastel E. R. auteur aut IRD Bouvier T. auteur aut IRD Auguet J. C. auteur aut IRD Dagorn Laurent auteur aut IRD Moroh J. L. auteur aut IRD Adingra A. auteur aut IRD Bettarel Yvan auteur aut IRD text journalArticle eng text/pdf born digital access Although tunas represent a significant part of the global fish economy and a major nutritional resource worldwide, their microbiome still remains poorly documented. Here, we conducted an analysis of the taxonomic composition of the bacterial communities inhabiting the gut, skin, and liver of two most consumed tropical tuna species (skipjack and yellowfin), from individuals caught in the Atlantic and Indian oceans. We hypothesized that each organ harbors a specific microbial assemblage whose composition might vary according to different biotic (sex, species) and/or abiotic (environmental) factors. Our results revealed that the composition of the tuna microbiome was totally independent of fish sex, regardless of the species and ocean considered. Instead, the main determinants of observed diversity were (i) tuna species for the gut and (ii) sampling site for the skin mucus layer and (iii) a combination of both parameters for the liver. Interestingly, 4.5% of all amplicon sequence variants (ASV) were shared by the three organs, highlighting the presence of a core-microbiota whose most abundant representatives belonged to the genera Mycoplasma, Cutibacterium, and Photobacterium. Our study also revealed the presence of a unique and diversified bacterial assemblage within the tuna liver, comprising a substantial proportion of potential histamine-producing bacteria, well known for their pathogenicity and their contribution to fish poisoning cases. These results indicate that this organ is an unexplored microbial niche whose role in the health of both the host and consumers remains to be elucidated. specialized Microbiome Bacteria Histamine Tuna Liver ATLANTIQUE OCEAN INDIEN COTE D'IVOIRE REUNION ZONE TROPICALE 040 034 084 [Early access] [14 ] 2022 0095-3628 https://www.documentation.ird.fr/hor/fdi:010085984 10.1007/s00248-022-02096-4 0095-3628 [F B010085984] https://www.documentation.ird.fr/hor/fdi:010085984 https://www.documentation.ird.fr/intranet/publi/2022-09/010085984.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2022-09-28 2025-02-24 fdi:010085984 fre