Auger Pierre auteur aut IRD McHich R. auteur aut IRD Raissi N. auteur aut IRD Kooi B. W. auteur aut IRD text journalArticle eng text/pdf born digital access We present a dynamical model of a spatial fishery describing the time evolution of the fish stock, the fishing effort and the market price of the resource. The market price is fixed by the gap between the supply and the demand. Assuming two time scales, we use "aggregation of variables methods" in order to derive a reduced model governing fish density and fishing effort at a slow time scale. The bifurcation analysis of the reduced model is performed. According to parameters values, three main cases can occur: (i) a stable fishery free equilibrium, (ii) a stable persistent fishery equilibrium and (iii) coexistence of three strictly positive equilibria, two of them being stable separated by a saddle. In this last case, a stable equilibrium corresponds to a traditional fishery with large fish stock, small fishing effort and small market price. The second stable one corresponds to over-exploitation of the resource with small fish stock, large fishing effort and large market price. specialized Spatial fishery Market price Time scales Aggregated model Multi-stability Over-exploitation Traditional fishery 040 020 7 1 13-20 2010 1476-945X https://www.documentation.ird.fr/hor/fdi:010049410 10.1016/j.ecocom.2009.03.005 1476-945X [F B010049410] https://www.documentation.ird.fr/hor/fdi:010049410 https://www.documentation.ird.fr/intranet/publi/2010/04/010049410.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2010-05-03 2017-08-23 fdi:010049410 fre