Escalle L. auteur aut IRD Gaertner Daniel auteur aut IRD Chavance Pierre auteur aut IRD de Molina A. D. auteur aut IRD Ariz J. auteur aut IRD Merigot B. auteur aut IRD text journalArticle eng text/pdf born digital access Time-area regulations have been introduced to manage stocks of tropical tuna, given the increased use of drifting fish aggregation devices (FADs). However, the consequences in terms of changes in fishing strategies and effort reallocation may not always be as expected. For instance, in the eastern Pacific Ocean, previous studies have highlighted that the increase use of FAD-fishing following the demand for tuna caught without dolphin mortality has raised concerns about the bycatch and the capture of juvenile tuna. In the tropical eastern Atlantic and western Indian Oceans, this study aimed to (1) assess, using before-after analysis, the consequences of previous time-area regulations on FAD sets on the fishing effort allocated to megafauna associated sets, and (2) evaluate through Monte Carlo simulations the potential effect of new regulations banning whale or/and whale shark associated sets. Firstly, we showed that previous time-area regulations, which were mainly implemented during seasons with few whale and whale shark associated sets, generally had thus little effect on the number of megafauna associated sets. Secondly, some simulations, particularly when both whale and whale shark associated sets were banned, predicted consequences of changes in fishing strategy. Indeed, these types of ban could lead to an increase in the number of FAD and free school sets but no change in the tuna catch, as well as a slight decrease in bycatch. These results indicate that an ecosystem approach to fisheries, by taking into account megafauna associated sets and bycatch, should thus be adopted when implementing management or conservation measures. specialized Before-after analysis Time-area regulation Monte Carlo simulation Marine megafauna Purse-seine fishery ATLANTIQUE EST OCEAN INDIEN OUEST ZONE TROPICALE 040 25 9 1637-1659 2016 0960-3115 https://www.documentation.ird.fr/hor/fdi:010067687 10.1007/s10531-016-1146-2 0960-3115 [F B010067687] https://www.documentation.ird.fr/hor/fdi:010067687 https://www.documentation.ird.fr/intranet/publi/2016/08/010067687.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-09-05 2017-08-23 fdi:010067687 fre