Fish Behaviour in Exploited Ecosystems

Dynamic Complexity in Exploited Marine Ecosystems

Marine ecosystems are increasingly recognized as exhibiting the principal hallmarks of complex systems, including the possibility of sudden shifts in state among alternative basins of attraction and both periodic and aperiodic dynamical behavior. Over the last several decades a well-defined theory of complexity has emerged, integrating earlier (and inter-related) concepts based on bifurcation t...

Are exploited fish populations stable?

A knowledge base for Exploited Marine Ecosystems

In 2008, IRD started to work on setting up a knowledge base (named Ecoscope) about Ecosystem Approach to Fisheries domain (EAF) in the context of a marine ecology laboratory studying Exploited Marine Ecosystems in different regions of the world. This application was meant to fit the needs of researchers by improving knowledge and related information resources management [14,12]. Among other goa...

Taylor's law and body size in exploited marine ecosystems

Taylor's law (TL), which states that variance in population density is related to mean density via a power law, and density-mass allometry, which states that mean density is related to body mass via a power law, are two of the most widely observed patterns in ecology. Combining these two laws predicts that the variance in density is related to body mass via a power law (variance-mass allometry)...

Stabilization of an Exploited Fish Population

Abstract. The purpose of the paper is to design a fishing strategy in order to regulate an exploited fish population. To this end, we use a stagestructured model of a harvested fish population that has been derived in [5]. We give a formula for the fishing effort as a feedback control that allows to stabilize the system. travail réalisé avec la contribution financière du CNCPRST (Maroc) et du C...