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dc.contributor.authorLarsen, Roger B.
dc.contributor.authorHerrmann, Bent
dc.contributor.authorSistiaga, Manu Berrondo
dc.contributor.authorGrimaldo, Eduardo
dc.contributor.authorBrinkhof, Jesse
dc.contributor.authorTatone, Ivan
dc.date.accessioned2018-08-23T07:21:19Z
dc.date.available2018-08-23T07:21:19Z
dc.date.issued2017
dc.description.abstractGreenland halibut (<i>Reinhardtius hippoglossoides</i>) is a commercially important species in the northeast Atlantic trawl fishery. However, direct fishing for it is not allowed and it can only be harvested as bycatch. We investigated for the first time the size selection of Greenland halibut in a newly developed double steel grid system designed for the cod and haddock bottom trawl fishery. In this sorting system the first grid (lower grid) replaced the lifting panel present in the traditional Sort-V single grid system often applied in the fishery. Thus, it contributed to the fish sorting process and simultaneously guided fish to the second grid (upper grid). However, the results showed that nearly all Greenland halibut escapees left through the second grid. The release efficiency of the first grid was estimated to be low, and only 11% of the Greenland halibut entering the grid zone made contact with this grid in a way that provided a size-dependent release probability. In contrast, the estimations showed that all Greenland halibut, still in the gear after the first grid, made contact with the second grid. However, this contact was suboptimal for size selection of most individuals, as the estimated 50% retention length (based on the morphology of Greenland halibut) was below the expected value. Comparison of the release efficiency of the new double grid system relative to that of the grid systems used in the fishery today revealed that the new system did not improve the release of undersized Greenland halibut. Moreover, we found that the existing Sort-V single grid system released significantly more Greenland halibut than the new double grid system.en_US
dc.descriptionSource at <a href=https://doi.org/10.2960/J.v49.m715> https://doi.org/10.2960/J.v49.m715</a>.en_US
dc.identifier.citationLarsen, R.B., Herrmann, B., Sistiaga, M.B., Grimaldo, E., Brinkhof, J. & Tatone, I. (2017). Size selection of Greenland halibut (Reinhardtius hippoglossoides) in the Norwegian bottom trawl fishery with a newly developed double grid system. Journal of Northwest Atlantic Fishery Science, 49, 39-48. https://doi.org/10.2960/J.v49.m715en_US
dc.identifier.cristinIDFRIDAID 1537297
dc.identifier.doi10.2960/J.v49.m715
dc.identifier.issn0250-6408
dc.identifier.issn1813-1859
dc.identifier.urihttps://hdl.handle.net/10037/13566
dc.language.isoengen_US
dc.publisherNorthwest Atlantic Fisheries Organization (NAFO)en_US
dc.relation.journalJournal of Northwest Atlantic Fishery Science
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/MARINFORSK/243627/Norway/Managing trawl catches by improving the hydrodynamic performance of sorting grid sections and codends//en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920en_US
dc.subjectSorting griden_US
dc.subjectGrid selectivityen_US
dc.subjectGreenland halibuten_US
dc.subjectTrawl fisheryen_US
dc.subjectVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920en_US
dc.titleSize selection of Greenland halibut (Reinhardtius hippoglossoides) in the Norwegian bottom trawl fishery with a newly developed double grid systemen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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