Ly S. auteur aut IRD Mansal F. auteur aut IRD Balde M. auteur aut IRD Nguyen Huu Tri auteur aut IRD Auger Pierre auteur aut IRD text journalArticle eng text/pdf born digital access We present a mathematical model of a fishery on several sites with a variable price. The model takes into account the evolution during the time of the resource, fishes and boats movements between the different it sites, fishing effort and price that varies with respect to supply and demand. We suppose that boats and fishes movements as well as prices variations occur at a fast time scale. NW use methods of aggregation of variables in order to reduce the number of variables and we derive a reduced model governing two global variables, respectively the biomass of the resource and the fishing effort of the whole fishery. We look for the existence of equilibria of the aggregated model. We show that the aggregated model can have I, 2 or 3 non trivial equilibria. We show that a variation of the total number of sites can induce a switch from over-exploitation to sustainable fisheries. specialized dynamical system multi-site fishery variable price demand function equilibrium stability optimum capture 040 020 8 6 130-142 2013 0973-5348 https://www.documentation.ird.fr/hor/fdi:010061333 10.1051/mmnp/20138609 0973-5348 [F B010061333] https://www.documentation.ird.fr/hor/fdi:010061333 https://www.documentation.ird.fr/intranet/publi/2013/12/010061333.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2013-12-23 2017-08-23 fdi:010061333 fre