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dc.contributor.authorUnderwood, Melanieeng
dc.contributor.authorRosen, Shaleeng
dc.contributor.authorEngås, Arilleng
dc.contributor.authorEriksen, Elenaeng
dc.date.accessioned2015-03-09T11:40:03Z
dc.date.available2015-03-09T11:40:03Z
dc.date.issued2014-11-13eng
dc.identifier.issn1932-6203en_US
dc.identifier.urihttp://hdl.handle.net/1956/9487
dc.description.abstractEcosystem surveys are carried out annually in the Barents Sea by Russia and Norway to monitor the spatial distribution of ecosystem components and to study population dynamics. One component of the survey is mapping the upper pelagic zone using a trawl towed at several depths. However, the current technique with a single codend does not provide finescale spatial data needed to directly study species overlaps. An in-trawl camera system, Deep Vision, was mounted in front of the codend in order to acquire continuous images of all organisms passing. It was possible to identify and quantify of most young-of-the-year fish (e.g. Gadus morhua, Boreogadus saida and Reinhardtius hippoglossoides) and zooplankton, including Ctenophora, which are usually damaged in the codend. The system showed potential for measuring the length of small organisms and also recorded the vertical and horizontal positions where individuals were imaged. Young-of-the-year fish were difficult to identify when passing the camera at maximum range and to quantify during high densities. In addition, a large number of fish with damaged opercula were observed passing the Deep Vision camera during heaving; suggesting individuals had become entangled in meshes farther forward in the trawl. This indicates that unknown numbers of fish are probably lost in forward sections of the trawl and that the heaving procedure may influence the number of fish entering the codend, with implications for abundance indices and understanding population dynamics. This study suggests modifications to the Deep Vision and the trawl to increase our understanding of the population dynamics.en_US
dc.language.isoengeng
dc.publisherPLoSen_US
dc.rightsAttribution CC BYeng
dc.rights.urihttp://creativecommons.org/licenses/by/4.0eng
dc.titleDeep vision: An in-trawl stereo camera makes a step forward in monitoring the pelagic communityen_US
dc.typePeer reviewed
dc.typeJournal article
dc.date.updated2015-03-06T07:30:10Z
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2014 Underwood et alen_US
dc.source.articlenumbere112304
dc.identifier.doihttps://doi.org/10.1371/journal.pone.0112304
dc.identifier.cristin1198133
dc.source.journalPLoS ONE
dc.source.409
dc.source.1411


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