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Directive Cadre sur l’Eau : Cartographie des herbiers de Zostera marina du Bassin d'Arcachon ArchiMer
Trut, Gilles; Auby, Isabelle; Rigouin, Loic; Oger-jeanneret, Helene; Ganthy, Florian; Cognat, Mathis; Noel, Claire; Marchetti, Simon; Bauer, Eric.
Ce document présente les résultats du suivi surfacique des herbiers infralittoraux de zostères marines du bassin d’Arcachon opéré en juin 2016. Comme en 2008 (Dalloyau et al., 2009), la méthode utilisée, dite DIVA (Détection & Inspection Verticale Acoustique), permet de générer une information de présence/absence, par superposition de signaux issus d’un sonar latéral GEOSWATH et d’un sondeur acoustique mono-faisceau de grande précision. Ces données sont couplées à des observations de terrain obtenues à l’aide de caméras vidéo sous-marines GoPro, reliées à un système de positionnement sub-métrique. Les opérations de terrain ont été réalisées en juin 2016. En outre, ce rapport traite de l'évolution temporelle de la surface occupée par les herbiers de...
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Ano: 2018 URL: http://archimer.ifremer.fr/doc/00444/55526/57114.pdf
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High-Resolution Acoustic Cameras Provide Direct and Efficient Assessments of Large Demersal Fish Populations in Extremely Turbid Waters ArchiMer
Artero, Celine; Marchetti, Simon; Bauer, Eric; Viala, Christophe; Noël, Claire; Koenig, Christopher; Berzins, Rachel; Lampert, Luis.
Monitoring fish species populations in very turbid environments is challenging. Acoustic cameras allow work in very poor visibility but are often deployed as a fixed observation point, limiting the scope of the survey. A BlueView P900-130 acoustic camera was deployed in rocky marine habitats off the coast of French Guiana in order to assess the total abundance, size structure and spatial distribution of a demersal fish population. The relevancy of using an acoustic camera to achieve these three objectives was evaluated by comparing acoustic data to those obtained from fishing surveys. The detection and identification of large demersal fish species were possible with the shape and size of the acoustic signal and acoustic shadow silhouette as well as...
Tipo: Text Palavras-chave: Fish stock survey; Turbid waters; Acoustic camera; Demersal fish; Distribution; Detectability.
Ano: 2021 URL: https://archimer.ifremer.fr/doc/00687/79907/82809.pdf
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