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	Provedor de dados ArchiMer (2) Autor Doray, Mathieu (1) Petitgas, Pierre (1) Palavra-chave Geostatistics (2) Géostatistique (2) Abondance (1) Abundance estimation (1) Acoustique (1) Advection diffusion models (1) Aggregation (1) Aggregative behaviour (1) Agrégation (1) Comportement agrégatif (1) DCP (1) Distribution spatiale (1) Echosounding (1) Estimation (1) FAD (1) Hierarchy (1) Hiérarchie (1) Lesser Antilles (1) Martinique (1) Micronecton (1) Mais... Tipo do documento Text (2) Ano 2006 (1) 1993 (1) País France (2) Idioma Francês (1) Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última L'agrégation de thons de sub-surface au sein du système [DCP ancré - macronecton - environnement - pêche] en Martinique : étude hiérarchique par méthodes acoustiques, optiques et halieutiques ArchiMer Doray, Mathieu. Artificial Fish Aggregating Devices (FADs) are known to concentrate tropical tunas. This aggregative behaviour drastically increases the vulnerability of these species to fishing. Alternatively, FADs can be used as oceanic observatories to study the aggregative behaviour of large pelagic fish. We conducted sea surveys in Martinique (Lesser Antilles) to i) establish a typology of the pelagic fish aggregations found around moored FADs ii) study their relations with their biotic and abiotic environment and the local fishery. The mean biomass of large pelagic fish aggregations was also estimated to provide scientific inputs to achieve a sustainable management of the moored FAD fishery. The first part presents the background of the study. We introduce the... Tipo: Text Palavras-chave: Martinique; Lesser Antilles; Hierarchy; Advection diffusion models; Geostatistics; Micronekton; Tuna/environment relationships; Aggregative behaviour; Tuna; Underwater video; Echosounding; FAD; Martinique; Petites Antilles; Hiérarchie; Modèles d'advection diffusion; Géostatistique; Micronecton; Relation thon/environnement; Comportement agrégatif; Thon; Vidéo sous marine; Acoustique; DCP. Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-1735.pdf Use of a disjunctive kriging to model areas of high pelagic fish density in acoustic fisheries surveys ArchiMer Petitgas, Pierre. Schooling fish may aggregate in very high densities covering very small areas. Thus the probability of hitting such high-density spots during a large-scale sampling is very low. The sampling fluctuations of the tail of the histogram are thought to be very significant. The stock biomass estimate and its precision rely greatly on how precisely the tail of the histogram can be sampled. In order to acquire elements for improving survey designs and abundance estimators wc study here the relation in space that the high values have with the other values. A disjunctive kriging approach is used. Different quantiles of the histogram are coded by indicators. The spatial structure of each indicator and its spatial covariation with the others are studied by computing... Tipo: Text Palavras-chave: Distribution spatiale; Agrégation; Abondance; Estimation; Géostatistique; Échantillonnage; Spatial distribution; Aggregation; Abundance estimation; Geostatistics; Sampling. Ano: 1993 URL: http://archimer.ifremer.fr/doc/00190/30076/28564.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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