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Techniques géostatistiques au service de l'aménagement de la pêcherie céphalopodière marocaine

Abstract : The regulation of the cephalopod fishery off Morocco is mainly focused on catch limitation of the target specie, octopus (Octopus vulgaris). Its exploitable biomass is estimated by direct assessments through scientific surveys. These have to (i) provide a good estimator - unbiased and accurate – of the global abundance with its estimation variance and stock distribution maps, (ii) monitor the spatio-temporal dynamic of the octopus, whose knowledge is essential for management. To achieve this:
- The spatial features of the octopus densities are described and the conditions of stationarity are analyzed on the basis of historical data.
- Methods for global estimation - transitive and intrinsic - are applied taking into account the data characteristics, including non-stationarity on the probabilistic intrinsic approach and the uncontrolled sampling on the deterministic transitive approach.
- The spatial pattern of the octopus is described using geostatistical indicators. It is characterized by a widespread distribution of the spawning stock over the continental shelf and a coastal recruitment success.
Some important implications for management are discussed. Finally, this work is seen within larger context of the cephalopod fishery management and the new fishing policy. New perspectives for the application of the geostatistical techniques and the spatial statistics are considered for stock assessments, especially of the octopus.
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Submitted on : Wednesday, February 10, 2010 - 8:00:00 AM
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  • HAL Id : pastel-00005805, version 1


Abdelmalek Faraj. Techniques géostatistiques au service de l'aménagement de la pêcherie céphalopodière marocaine. Mathématiques [math]. École Nationale Supérieure des Mines de Paris, 2009. Français. ⟨NNT : 2009ENMP1663⟩. ⟨pastel-00005805⟩



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