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dc.contributor.authorMelli, Valentina
dc.contributor.authorKrag, L.A.
dc.contributor.authorHerrmann, Bent
dc.contributor.authorKarlsen, J.D.
dc.date.accessioned2019-03-31T18:28:26Z
dc.date.available2019-03-31T18:28:26Z
dc.date.created2018-12-02T21:21:33Z
dc.date.issued2018-03
dc.identifier.citationFisheries Research. 2018, 211 282-290.nb_NO
dc.identifier.issn0165-7836
dc.identifier.urihttp://hdl.handle.net/11250/2592569
dc.description.abstractA promising design to improve selectivity in the Nephrops-directed trawl fishery is the horizontally divided trawl codend. Previous studies have succeeded in separating the majority of fish from Nephrops; however, cod (Gadus morhua), juvenile roundfish and flatfish still enter the lower compartment in relative high proportions. In this study we investigated if and to which extent it is possible to improve the vertical separation of fish from Nephrops by adding active behaviour stimulators. These stimulators are designed to exploit fish avoidance behaviour and lead them into the upper compartment while Nephrops move into the lower compartment. We tested two types of behaviour stimulators: a chain curtain at the entrance of the lower compartment at the point of separation and a set of rising float-lines inserted ahead of the point of separation. The length-dependent vertical separation of five important commercial fish species and Nephrops was analysed in comparison to the horizontally divided trawl codend with no stimulator, towed in parallel to the test trawl. The results showed that fish’s vertical separation can be partially improved by the addition of stimulators, without complicating fishing operations or increasing the proportion of Nephrops that enters the upper compartment. However, the improvement was limited and none of the two active stimulators tested managed to simultaneously improve the separation of cod, juvenile roundfish and flatfish.nb_NO
dc.language.isoengnb_NO
dc.publisherElseviernb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.subjectHorizontally divided codendnb_NO
dc.subjectBehavioural stimulatorsnb_NO
dc.subjectVertical separationnb_NO
dc.subjectNephropsnb_NO
dc.subjectBycatchnb_NO
dc.titleCan active behaviour stimulators improve fish separation from Nephrops (Nephrops norvegicus) in a horizontally divided trawl codend?nb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber282-290nb_NO
dc.source.volume211nb_NO
dc.source.journalFisheries Researchnb_NO
dc.identifier.doi10.1016/j.fishres.2018.11.027
dc.identifier.cristin1638223
cristin.unitcode7566,2,0,0
cristin.unitnameSjømatteknologi
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal