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dc.contributor.authorHandegard, Nils Olav
dc.contributor.authorTjøstheim, Dag
dc.date.accessioned2007-06-06T07:33:57Z
dc.date.issued2005
dc.identifier.issn0706-652X
dc.identifier.urihttp://hdl.handle.net/11250/108691
dc.description.abstractThe reaction of individual gadoids to a bottom-trawling vessel has been observed in situ in the Barents Sea using a free-floating buoy and acoustic target-tracking methods. More than 20 000 tracks were analysed in terms of velocity changes in vertical, athwarthship, and alongship direction relative to the vessel, the warps, and the trawl, respectively. The fish starts diving about 15 min before vessel passing. This coincides with the time the trawl is running and not with the gradual increase in vessel noise caused by the approaching vessel. The change in horizontal movement is more gradual and is directed away from the vessel in the alongship direction, but towards the vessel in the athwarthship direction. The strongest and sharpest response is related to the trawl warps. A strong herding in front of the warps is seen. Closer to the bottom, an athwarthship herding reaction is seen away from the trawl doors or possibly the lower parts of the warps. There were only minor differences when grouping the tracks according to light level, fish size, and fish density.en
dc.format.extent647003 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.publisherNRC Research Press
dc.subjectcoden
dc.subjecttorsken
dc.subjecttrawlingen
dc.subjecttråling
dc.titleWhen fish meet a trawling vessel: examining the behaviour of gadoids using a free-floating buoy and acoustic split-beam trackingen
dc.typeJournal articleen
dc.typePeer reviewed
dc.source.pagenumber2409-2422en
dc.source.volume62
dc.source.journalCanadian Journal of Fisheries and Aquatic Sciences
dc.source.issue10
dc.identifier.doihttp://dx.doi.org/10.1139/F05-131


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