Dupaix A. auteur aut IRD Dagorn Laurent auteur aut IRD Duparc Antoine auteur aut IRD Guillou Aurélie auteur aut IRD Deneubourg J. L. auteur aut IRD Capello Manuela auteur aut IRD text journalArticle eng text/pdf born digital access Human-induced habitat modifications can severely impact the biology and behavior of wild species. Drifting fish aggregating devices (DFADs), used by industrial purse-seine tropical tuna fisheries, significantly increased the number of floating objects found in the open ocean, with which tropical tuna associate. This habitat change has raised concerns over the risk of modifying the behavior and altering the biology of tuna and other associated species (the so-called ecological trap hypothesis). Relying on a time-series from 1987-2019 of more than 25000 length-weight samples collected in the western Indian Ocean, we reject the hypothesis that the body condition (Le Cren's relative condition factor, Kn) of yellowfin tuna Thunnus albacares decreased concurrently with the increased number of DFADs. This result suggests the absence of negative long-term impacts of DFADs on the condition of tuna. As other factors may have counteracted possible negative effects of DFADs, we recommend long-term monitoring of the habitat along with biological and behavioral parameters of tunas to detect any critical change. specialized Indicator log Relative condition factor Thunnus albacares Indian Ocean Industrial tuna fisheries Floating objects OCEAN INDIEN 040 034 711 121-127 2023 0171-8630 https://www.documentation.ird.fr/hor/fdi:010088410 10.3354/meps14313 0171-8630 [F B010088410] https://www.documentation.ird.fr/hor/fdi:010088410 https://www.documentation.ird.fr/intranet/publi/2023-07/010088410.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2023-07-06 2025-02-24 fdi:010088410 fre