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dc.contributor.authorBrinkhof, Jesse
dc.contributor.authorLarsen, Roger B.
dc.contributor.authorHerrmann, Bent
dc.contributor.authorSistiaga, Manu
dc.date.accessioned2020-08-25T11:29:46Z
dc.date.available2020-08-25T11:29:46Z
dc.date.issued2020-07-28
dc.description.abstractThis study investigated the size selectivity and catch efficiency in the North-east Atlantic demersal trawl fishery targeting cod (<i>Gadus morhua</i>) and haddock (<i>Melanogrammus aeglefinus</i>). The use of a sorting grid followed by a size selective codend is compulsory in this fishery. Experimental fishing was conducted with a commercially rigged trawl, flexigrid section, and diamond-mesh codend. The flexigrid section is a dual sorting system and all fish that escaped from the two grids in the flexigrid system and the codend were retained in separate covers. This allowed us to estimate the combined size selectivity of the system, as well as the separate contributions from the first grid, second grid, and codend. The catch efficiencies for cod and haddock below and above the minimum reference length (MRL) were quantified by estimating the values for a set of exploitation pattern indicators. The results showed that most fish escaped from the flexigrid section. Only a few fish below the MRL entered the codend and nearly all of them subsequently escaped through the codend meshes. The probability of retaining undersized cod and haddock was low with the combined system. Furthermore, the results showed that the probability of escape was high through the second grid in the system for fish above the MRL, and this finding was supported by the exploitation pattern indicators. In particular, the estimated exploitation pattern indicators showed that using the current MRL and the fish size distributions encountered during the trials, no haddock and only 2.3 % of cod below the MRL were retained by the gear. However, 77.4 % of the haddock and 16.0 % of the cod above the MRL were found to escape, thereby indicating poor catch efficiency, especially for haddock. These results demonstrate the importance of supplementing size selectivity research with estimates of the actual catch efficiency using the gear employed, which were quantified using exploitation pattern indicators in this study.en_US
dc.identifier.citationBrinkhof J, Larsen RBL, Herrmann B, Sistiaga MB. Size selectivity and catch efficiency of bottom trawl with a double sorting grid and diamond mesh codend in the North-east Atlantic gadoid fishery. Fisheries Research. 2020;231en_US
dc.identifier.cristinIDFRIDAID 1824728
dc.identifier.doi10.1016/j.fishres.2020.105647
dc.identifier.issn0165-7836
dc.identifier.issn1872-6763
dc.identifier.urihttps://hdl.handle.net/10037/19150
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalFisheries Research
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2020 The Author(s)en_US
dc.subjectVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920en_US
dc.subjectVDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920en_US
dc.titleSize selectivity and catch efficiency of bottom trawl with a double sorting grid and diamond mesh codend in the North-east Atlantic gadoid fisheryen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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