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ANIMAL BEHAVIOUR, 2004, 67, 319e326 doi:10.1016/j.anbehav.2003.07.007 FAD: Fish Aggregating Device or Fish Attracting Device? A new analysis of yellowfin tuna movements around floating objects CHARLOTTE GIRARD*, SIMON BENHAMOU † LAURENT DAGORN* ´ ´ *Institut de Recherche pour le Developpement, UR 061 ACTIVE, La Reunion yCentre d’Ecologie Fonctionnelle et Evolutive, CNRS, Montpellier (Received 17 September 2002; initial acceptance 18 October 2002; final acceptance 6 July 2003; MS. number: 7469R) Tropical tuna are known to associate with floating objects. Because fish are easier to detect and to catch when around these objects, fishermen have extensively deployed a large number of artificial floating objects in the tropical oceans. Although such objects are referred to as Fish Aggregating Devices (FADs), there is yet no strong evidence that fish do show an aggregative behaviour around them. The high probability of finding tuna around FADs may be the result of an aggregation process (high density of fish because fish stay for a long time around FADs) as well as an attraction process (high flow of fish through FADs). We analysed the movements of 14 yellowfin tuna, Thunnus albacares, in relation to FADs moored in the Indian and Pacific Oceans (corresponding to all the published tracking data) to determine whether the observed movement patterns resulted from an aggregation or an attractio