Hieu N. T. auteur aut IRD Brochier Timothée auteur aut IRD Tri N. H. auteur aut IRD Auger Pierre auteur aut IRD Brehmer Patrice auteur aut IRD text journalArticle eng text/pdf born digital access We consider a fishery model with two sites: (1) a marine protected area (MPA) where fishing is prohibited and (2) an area where the fish population is harvested. We assume that fish can migrate from MPA to fishing area at a very fast time scale and fish spatial organisation can change from small to large clusters of school at a fast time scale. The growth of the fish population and the catch are assumed to occur at a slow time scale. The complete model is a system of five ordinary differential equations with three time scales. We take advantage of the time scales using aggregation of variables methods to derive a reduced model governing the total fish density and fishing effort at the slow time scale. We analyze this aggregated model and show that under some conditions, there exists an equilibrium corresponding to a sustainable fishery. Our results suggest that in small pelagic fisheries the yield is maximum for a fish population distributed among both small and large clusters of school. specialized Optimal yield Small pelagic fish Fish school Clusters Marine protected area Aggregation of variables Three level system 040 036 020 62 3 339-353 2014 0001-5342 https://www.documentation.ird.fr/hor/fdi:010062476 10.1007/s10441-014-9220-1 0001-5342 [F B010062476] https://www.documentation.ird.fr/hor/fdi:010062476 https://www.documentation.ird.fr/intranet/publi/2014/09/010062476.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2014-10-02 2024-01-08 fdi:010062476 fre