Faugeras Blaise auteur aut IRD Maury Olivier auteur aut IRD text journalArticle eng The goal of this paper is to present a generic multi-region nonlinear age-size structured fish population model, and to assess its mathematical well-posedness. An initial-boundary-value problem is formulated. Existence and uniqueness of a positive weak solution is proved. Eventually, a comparison result is derived: the population of all regions decreases as the mortality rate increases in at least one region. (c) 2004 Elsevier Ltd. All rights reserved. specialized population dynamics age size structure system of partial differential equations initial boundary value problem variational formulation positivity 040 6 3 447-460 2005 1468-1218 https://www.documentation.ird.fr/hor/fdi:010042250 10.1016/j.nonrwa.2004.09.005 1468-1218 [F B010042250] https://www.documentation.ird.fr/hor/fdi:010042250 IRD - Base Horizon / Pleins textes 2006-03-29 2017-08-23 fdi:010042250 fre