Robert M. auteur aut IRD Dagorn Laurent auteur aut IRD Lopez J. auteur aut IRD Moreno G. auteur aut IRD Deneubourg J. L. auteur aut IRD text journalArticle eng text/pdf born digital access Tropical tunas associate with objects floating at the surface of the ocean, a behavior widely exploited by fishers. However, the respective roles played by environmental variables and behavioral processes (e.g., social behavior) in the formation of these aggregations remain elusive. To investigate the role of social behavior in the dynamics of such aggregations, we used the binary choice approach. The experimental design comprised two close and identical anchored fish aggregating devices (FADS) equipped with an echo sounder buoy to monitor the aggregated biomass of tuna under each device. Analysis of the results entailed characterizing whether the aggregated biomass is distributed asymmetrically (indicative of social behavior playing a role in the dynamics) or symmetrically between the two close and identical FADs, and comparing the results with theoretical distributions based on different definitions of basic units (individual fish or small schools). The results suggest that social interactions underlie aggregation processes, which represents a major advance in our understanding of these aggregations, a priority for science-based fishery management. While recognizing the logistical and technical constraints, we encourage the development of experimental studies (e.g., in which animals are presented with controlled situations) to enhance our understanding of the behavior of large pelagic fish. specialized Aggregation Binary choice FADs Social behavior Tuna 034 040 440 238-243 2013 0022-0981 https://www.documentation.ird.fr/hor/fdi:010060743 10.1016/j.jembe.2013.01.005 0022-0981 [F B010060743] https://www.documentation.ird.fr/hor/fdi:010060743 https://www.documentation.ird.fr/intranet/publi/2013/04/010060743.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2013-05-02 2017-08-23 fdi:010060743 fre