A multi-region nonlinear age-size structured fish population model /Faugeras, Blaise /Maury, Olivier population dynamics age size structure system of partial differential equations initial boundary value problem variational formulation positivity 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. 2005 text https://www.documentation.ird.fr/hor/fdi:010042250 fdi:010042250 Faugeras Blaise, Maury Olivier. A multi-region nonlinear age-size structured fish population model. 2005, 6 (3), 447-460 EN