International eel symposium, 2003 - Quebec August 11, 2003
Oral Presentation

A Matrix Model for the Inland Part of the European Eel Population Dynamics

Lambert, P.* Cemagref, Unité Ressources Aquatiques Continentales, F-33612 Cestas Cedex FRANCE
Feunteun, E. Université de La Rochelle, Laboratoire de Biologie Marine, F-17042 La Rochelle FRANCE
Rochard, E. Cemagref, Unité Ressources Aquatiques Continentales, F-33612 Cestas Cedex FRANCE

Presenter email address: patrick.lambert AT Bordeaux.Cemagref.fr

Abstract Text: We propose a matrix model for the inland part of the European eel population dynamics based on an ecological pattern issued from literature knowledge. It simulates ageing, recruitment, sexual differentiation, silvering, moving and natural mortality. This model shows that it possible to simulate the defined pattern according to density dependant mortality, density dependant sexual determination and only diffusive movements. This model illustrates how an eel stock could get organised within a watershed. The simulated stock exhibit particularities which are discussed comparatively to cases described in the literature. Eels remain concentrated in the downstream compartments of the basin. Maximum pre-spawner escapement is obtained with a lower recruitment for females than for males. Female silver eel production seems to be less sensitive to recruitment variations.Consequences of this putative working are analysed in terms of i) field studies requirements (model validation) and ii) management strategies.