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Identifying macroplastic pathobiomes and antibiotic resistance in a subtropical fish farm

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Naudet, Jeanne | Roque d'Orbcastel, Emmanuelle | Bouvier, Thierry | Godreuil, Sylvain | Dyall, Sabrina | Bouvy, Simon | Rieuvilleneuve, Fabien | Restrepo-Ortiz, Claudia Ximena | Bettarel, Yvan | Auguet, Jean-Christophe

Edité par CCSD ; Elsevier -

International audience. Macroplastics are ubiquitous in aquaculture ecosystems. However, to date the potential role of plastics as a support for bacterial biofilm that can include potential human pathogenic bacteria (PHPB) and antibiotic-resistant bacteria (ARB) has been largely overlooked. In this study, we used a combination of metabarcoding and standard antibiotic susceptibility testing to study the pathobiome and resistome of macroplastics, fish guts and the environment in a marine aquaculture farm in Mauritius. Aquaculture macroplastics were found to be higher in PHPB, dominated by the Vibrionaceae family (0.34 % of the total community), compared with environmental samples. Moreover, isolates from aquaculture plastics showed higher significant multiple antibiotic resistance (MAR) compared to non-plastic samples of seawater, sediment and fish guts. These results suggest that plastics act as a reservoir and fomite of PHPB and ARB in aquaculture, potentially threatening the health of farmed fish and human consumers.

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