Dubuc A. auteur aut IRD Rummer J. L. auteur aut IRD Vigliola Laurent auteur aut IRD Lemonnier H. auteur aut IRD text journalArticle eng text/pdf born digital access The impact of eutrophication on wild fish individuals is rarely reported. We compared physiological and morphological traits of Siganus lineatus chronically exposed to aquaculture-induced eutrophication in the wild with individuals living at a control site. Eutrophication at the impacted site was confirmed by elevated organic matter (up to 150 % higher), phytoplankton (up to 7 times higher), and reduced oxygen (up to 60 % lower). Physiological and morphological traits of S. lineatus differed significantly between the two sites. Fish from the impacted site exhibited elevated hypoxia tolerance, increased gill surface area, shorter oxygen diffusion distances, and altered blood oxygen-carrying capacity. Elevated blood lactate and scope for anaerobic ATP production were observed, suggesting enhanced survival below critical oxygen levels. A significant 8.5 % increase in metabolic costs and altered allometric scaling, related to environmental degradation, were recorded. Our study underscores eutrophication's profound impact at the organism-level and the importance to mitigate it. specialized Coastal eutrophication Hypoxia tolerance Physiological plasticity Conservation physiology Oxygen uptake rates Allometry mass scaling 034 038 040 205 116599 [11 p.] 2024 0025-326X https://www.documentation.ird.fr/hor/fdi:010091027 10.1016/j.marpolbul.2024.116599 0025-326X [F B010091027] https://www.documentation.ird.fr/hor/fdi:010091027 https://www.documentation.ird.fr/intranet/publi/2024-08/010091027.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2024-08-28 2026-06-12 fdi:010091027 fre