Snouck-Hurgronje J. E. auteur aut IRD Kaplan David auteur aut IRD Chassot Emmanuel auteur aut IRD Maufroy A. auteur aut IRD Gaertner Daniel auteur aut IRD text journalArticle eng text/pdf born digital access Fishing on floating objects (FOBs) dominates catch in tropical tuna purse seine fisheries. One frequently cited advantage of deploying GPS-monitored FOBs is that the position information can be used for directed fishing to reduce search time for tuna. However, purse seiners also fish on foreign objects for which position information is not available. It is critical to quantify the prevalence of fishing on GPS-monitored versus unmonitored FOBs to understand how they impact fishing effort and catch per unit effort. We analyzed French commercial, observer, and FOB trajectory data in the Atlantic and Indian oceans to determine how often purse seine vessels fish on GPS-monitored FOBs. Only 2.7%-20.4% of French FOB fishing sets over 2007-2013 in both oceans were made on GPS-monitored FOBs. Though increasing over time, the low percentage suggests that French vessels do not primarily use GPS-monitored FOBs to reduce search time for tuna. We hypothesize that fishery-wide FOB deployments have important collective consequences for overall fishing effort and recommend that future effort metrics should be based on fishery-wide FOB activities. specialized ATLANTIQUE OCEAN INDIEN FRANCE ZONE TROPICALE 040 126 75 11 1849-1858 2018 0706-652X https://www.documentation.ird.fr/hor/fdi:010074347 10.1139/cjfas-2017-0152 0706-652X [F B010074347] https://www.documentation.ird.fr/hor/fdi:010074347 https://www.documentation.ird.fr/intranet/publi/2018/11/010074347.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2018-12-06 2023-07-11 fdi:010074347 fre