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	Provedor de dados ArchiMer (2) Autor Brehmer, Patrice (2) Gerlotto, François (2) Achury, Alina (1) Buestel, Dominique (1) Cotel, Pascal (1) Guennegan, Yvon (1) Guillard, Joelle (1) Laurent, Charline (1) Samb, Birane (1) Sanguinede, Fabien (1) Mais... Palavra-chave Artificial reef (1) Behaviour (1) Diel cycle (1) Echo type (1) Ecosystem (1) Fish school (1) In situ observations (1) Monitoring (1) Multibeam sonar (1) Mussel longline (1) Phenotypic expression (1) Schooling (1) Small pelagic fish (1) Mais... Tipo do documento Text (2) Ano 2007 (1) 2003 (1) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Schooling behaviour of small pelagic fish: phenotypic expression of independent stimuli ArchiMer Brehmer, Patrice; Gerlotto, François; Laurent, Charline; Cotel, Pascal; Achury, Alina; Samb, Birane. We compared echo sounder measurements of fish schools on Venezuelan and Senegalese coastal shelves. In both areas Sardinella aurita was the predominant aggregative species; the stocks are known to be genetically independent. Persistent school typology is described by analysing 7 acoustic surveys in Venezuela and comparing with pioneer observations in Senegal. The echo types encountered in both countries were comparable, with S. aurita and their associated species having comparable schooling behaviour. School morphology appears to be more related to species than to global characteristics of their ecosystems, as fish school descriptors were similar for both stocks. Nevertheless, S. aurita may adopt different school morphologies. Differentiation between day... Tipo: Text Palavras-chave: Small pelagic fish; Schooling; Phenotypic expression; In situ observations; Echo type; Diel cycle; Behaviour. Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2536.pdf New applications of hydroacoustic methods for monitoring shallow water aquatic ecosystems: the case of mussel culture grounds ArchiMer Brehmer, Patrice; Gerlotto, François; Guillard, Joelle; Sanguinede, Fabien; Guennegan, Yvon; Buestel, Dominique. The development of acoustics tools and methods for monitoring anthropized ecosystems represents a new field for the application of acoustics. Monitoring such an environment was not possible with single vertical echo sounders, due to the fact that the artificial structures and the natural targets were not distinguishable. Monitoring data were collected along the French Mediterranean coastline, during five short surveys of mussel culture longline areas. Both the Reson Seabat 6012 multibeam sonar (455 kHz) and the Simrad SR 240 omnidirectional sonar (23.75 kHz) were used for target detection. The former tools allow accurate allocation of the different types of echoes to artefacts, fish schools and scattered fish. The school characteristics collected included... Tipo: Text Palavras-chave: Ecosystem; Artificial reef; Mussel longline; Fish school; Monitoring; Multibeam sonar. Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-574.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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