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	Provedor de dados 5 (3) Autor Doray, Mathieu (3) Chantrel, Josselin (2) Reynal, Lionel (2) Gervain, P (1) Gervain, Paul (1) Josse, E (1) Josse, Erwan (1) Mais... Palavra-chave Aggregative behaviour (3) Lesser Antilles (3) Tuna (3) Acoustics (2) Underwater video (2) Acoustique (1) Advection diffusion models (1) Comportement agrégatif (1) DCP (1) Echosounding (1) FAD (1) Fish Aggregating Device (1) Fish aggregating device (1) Geostatistics (1) Géostatistique (1) Hierarchy (1) Hiérarchie (1) Large pelagic fish (1) Martinique (1) Micronecton (1) Mais... Tipo do documento Text (3) Ano 2007 (1) 2006 (2) País France (3) Idioma Inglês (2) Francês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Joint use of echosounding, fishing and video techniques to assess the structure of fish aggregations around moored Fish Aggregating Devices in Martinique (Lesser Antilles) 5 Doray, Mathieu; Josse, E; Gervain, P; Reynal, Lionel; Chantrel, Josselin. From April 2003 to April 2004 monthly sea surveys were conducted around 2 fish aggregating devices (FADs) moored at 2000 and 2500 m depth in Martinique (Lesser Antilles). The use of a dual frequency splitbeam echosounder combined with an underwater camera and fishing methods allowed assessment of average space and time distribution of pelagic fish aggregated beneath the FADs, as well as identification of their overall size and species composition. At daytime, 4 fish aggregations were identified at each FAD, representing 4 distinct types: i) an aggregation of small juvenile tuna (mean fork length, FL: 30 cm) observed very close to the surface in 25% of daytime periods; ii) a small surface aggregation dominated by carangids, Caranx crysos, present in 65% of... Tipo: Text Palavras-chave: Lesser Antilles; Tuna; Aggregative behaviour; Small scale fishery; Underwater video; Acoustics; Fish aggregating device. Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3634.pdf Acoustic characterisation of pelagic fish aggregations around moored fish aggregating devices in Martinique (Lesser Antilles) 5 Doray, Mathieu; Josse, Erwan; Gervain, Paul; Reynal, Lionel; Chantrel, Josselin. Sea cruises were conducted for 57 days over 16 months to characterise pelagic fish aggregations around 2 moored fish aggregating devices (FADs) in Martinique (Lesser Antilles). Echosounder surveys run in a star pattern were used in conjunction with obliquely beamed sonar observations. An echo-integration-by-shoal algorithm was implemented to isolate pelagic fish shoals from sound scattering layers and to compute mean morphometric, positional and density parameters. Tree regressions were used to select and classify pelagic fish Target Strengths (TS), with reference to their spatial and temporal characteristics. The main type of pelagic fish aggregation was a large sub-surface aggregation. It was observed during all daytime periods within a radius of 400 m... Tipo: Text Palavras-chave: Lesser Antilles; Tuna; Large pelagic fish; Aggregative behaviour; Shoal density; Target Strength; Acoustics; Fish Aggregating Device. Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1734.pdf 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 5 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 Registros recuperados: 3 Primeira ... 1 ... Última

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