Stephanie Mahévas

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We propose a new method to obtain bounds of dependability, performance or performability measures concerning complex systems modeled by a large Markov model. Its extends previous published techniques mainly designed to the analysis of dependability measures only, and working under more restrictive conditions. Our approach allows to obtain tight bounds of(More)
his paper deals with the design of modelling tools suitable for investigating the consequences of alternative policies on the dynamics of resources and fisheries, such as the evaluation of marine protected areas (MPA). We first review the numerous models that have been developed for this purpose, and compare them from several standpoints: population(More)
In order to provide reliable scientific advice and support for fisheries management, it is necessary to evaluate the biological and economic sustainability of complex fisheries, such as multi-species multifleet fisheries. Existing policy-screening modelling tools are not fully suitable in this purpose due to either an over-simplified description of(More)
The scope of this paper is to describe, evaluate, and forecast fishing trip choices of the Bay of Biscay pelagic fleet using random utility modeling (RUM). First, alternative fishing trip choices of this fleet were identified using multivariate statistical methods based on species landings weighted by value and defined as distinct fishing activity or(More)
In this paper, we present an approach to compare the impact of different management options on the dynamics of a mixed fishery. We used ISIS-Fish, a simulation tool aimed at evaluating the impact of spatial and seasonal management measures on the dynamics of mixed fisheries. The French Nephrops norvegicus (Norway lobster) – Merluccius merluccius (hake)(More)
Spatio-seasonal explicit simulation models can predict the impact of spatial management measures on marine fish populations and fishing activities. As fisheries are complex systems, fisheries simulation models are often complex, with many uncertain parameters. Here, the methodology is provided to deliver fishery diagnostics within an uncertainty context(More)
Despite an abundant literature, hake growth and migration remain poorly understood. A recent tagging campaign and an analysis of the growth increments on juvenile hake otoliths demonstrate that the growth rate has probably been largely underestimated. Migration rates have been studied through qualitative analysis of catch rate, but have not been confirmed(More)
Abstrad: The authors describe and solve a Markov model or the lealey bucket ATM generic 110w control mechanism. The model has a space carclinality which grows quiclely with its parameters and is challenging to solve. Exploiting the cyclic nature of the model, the authors develop a methoclology which allows them to enïciently solve instances of the mocle!(More)