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dc.contributor.authorBez, Nicholas
dc.contributor.authorReid, David
dc.contributor.authorNeville, Suzanna
dc.contributor.authorVérin, Yves
dc.contributor.authorHjellvik, Vidar
dc.contributor.authorGerritsen, Hans D.
dc.date.accessioned2007-06-06T11:44:18Z
dc.date.issued2007
dc.identifier.issn0706-652X
dc.identifier.urihttp://hdl.handle.net/11250/108701
dc.descriptionjournal home page: http://www.nrcresearchpress.com/en
dc.description.abstractAcoustic data are often collected during bottom trawl surveys. Their use can potentially improve the precision and accuracy of fish abundance estimates if acoustic data collected between trawl stations are consistent with those collected during trawling operations. This question is addressed here through the analysis of 20 bottom trawl surveys (three survey areas and five different survey series) with coincident acoustic measurements during and between trawl stations. Firstly, on-station and underway acoustic data were compared using statistics computed globally over each survey (average vertical profiles, global indices of collocations, and spatial structures) for various combinations of depth layers. Secondly, we focussed on underway acoustic data recorded in the vicinity of stations, distinguishing between data recorded before and after the tows. On-station and underway acoustic data were highly consistent, and no systematic perturbation of the acoustic sign due to the presence of the gear a few hundred metres behind the vessel was observed.en
dc.format.extent799945 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.subjectcoden
dc.subjecttorsken
dc.titleAcoustic data collected during and between bottom trawl stations: consistency and common trendsen
dc.typeJournal articleen
dc.typePeer reviewed
dc.source.pagenumber166-180en
dc.source.volume64en
dc.source.journalCanadian Journal of Fisheries and Aquatic Sciencesen
dc.source.issue1
dc.identifier.doihttp://dx.doi.org/10.1139/f06-174


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