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	Provedor de dados ArchiMer (2) Autor Brehmer, Patrice (2) Guennegan, Yvon (2) Buestel, Dominique (1) Gerlotto, François (1) Guillard, Jean (1) Guillard, Joelle (1) Sanguinede, Fabien (1) Sarré, Abdoulaye (1) Mais... Palavra-chave Fish school (2) Artificial reef (1) Boat noise (1) Ecosystem (1) Fish behavior (1) Fisheries acoustics (1) Monitoring (1) Multibeam sonar (1) Mussel longline (1) Small pelagic assessment (1) Vessel avoidance (1) Mais... Tipo do documento Text (2) Ano 2019 (1) 2003 (1) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última 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 Vessel Avoidance Response: A Complex Tradeoff Between Fish Multisensory Integration and Environmental Variables ArchiMer Brehmer, Patrice; Sarré, Abdoulaye; Guennegan, Yvon; Guillard, Jean. The avoidance reaction by fish in front of an approaching vessel is a major source of bias in direct biomass assessment and ecological studies based on fisheries acoustics data. An experiment was carried out to compare echosounder data obtained using a small speedboat and a research fisheries vessel generating significant higher noise above conventional reduced-noise standard. The results show that there was no significant difference between the individual fish target strength distributions, and the numbers of schools recorded by both boats, these schools having similar areas and perimeters. However, the schools detected by the noisier vessel were significantly deeper, and unexpectedly had a significantly higher energy level. These findings suggest that... Tipo: Text Palavras-chave: Vessel avoidance; Fish behavior; Fisheries acoustics; Small pelagic assessment; Fish school; Boat noise. Ano: 2019 URL: https://archimer.ifremer.fr/doc/00487/59906/63102.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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