Size selection of Greenland halibut (Reinhardtius hippoglossoides) in the Norwegian bottom trawl fishery with a newly developed double grid system
Source at https://doi.org/10.2960/J.v49.m715 . Greenland halibut ( Reinhardtius hippoglossoides ) 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...
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Northwest Atlantic Fisheries Organization (NAFO)
2017
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Online Access: | https://hdl.handle.net/10037/13566 https://doi.org/10.2960/J.v49.m715 |
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ftunivtroemsoe:oai:munin.uit.no:10037/13566 2023-05-15T16:23:35+02:00 Size selection of Greenland halibut (Reinhardtius hippoglossoides) in the Norwegian bottom trawl fishery with a newly developed double grid system Larsen, Roger B. Herrmann, Bent Sistiaga, Manu Berrondo Grimaldo, Eduardo Brinkhof, Jesse Tatone, Ivan 2017 https://hdl.handle.net/10037/13566 https://doi.org/10.2960/J.v49.m715 eng eng Northwest Atlantic Fisheries Organization (NAFO) Journal of Northwest Atlantic Fishery Science info:eu-repo/grantAgreement/RCN/MARINFORSK/243627/Norway/Managing trawl catches by improving the hydrodynamic performance of sorting grid sections and codends// Larsen, 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.m715 FRIDAID 1537297 doi:10.2960/J.v49.m715 0250-6408 1813-1859 https://hdl.handle.net/10037/13566 openAccess VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 Sorting grid Grid selectivity Greenland halibut Trawl fishery VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 Journal article Tidsskriftartikkel Peer reviewed 2017 ftunivtroemsoe https://doi.org/10.2960/J.v49.m715 2021-06-25T17:55:37Z Source at https://doi.org/10.2960/J.v49.m715 . Greenland halibut ( Reinhardtius hippoglossoides ) 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. Article in Journal/Newspaper Greenland Northeast Atlantic University of Tromsø: Munin Open Research Archive Greenland Journal of Northwest Atlantic Fishery Science 49 39 48 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 Sorting grid Grid selectivity Greenland halibut Trawl fishery VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 |
spellingShingle |
VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 Sorting grid Grid selectivity Greenland halibut Trawl fishery VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 Larsen, Roger B. Herrmann, Bent Sistiaga, Manu Berrondo Grimaldo, Eduardo Brinkhof, Jesse Tatone, Ivan Size selection of Greenland halibut (Reinhardtius hippoglossoides) in the Norwegian bottom trawl fishery with a newly developed double grid system |
topic_facet |
VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 Sorting grid Grid selectivity Greenland halibut Trawl fishery VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 |
description |
Source at https://doi.org/10.2960/J.v49.m715 . Greenland halibut ( Reinhardtius hippoglossoides ) 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. |
format |
Article in Journal/Newspaper |
author |
Larsen, Roger B. Herrmann, Bent Sistiaga, Manu Berrondo Grimaldo, Eduardo Brinkhof, Jesse Tatone, Ivan |
author_facet |
Larsen, Roger B. Herrmann, Bent Sistiaga, Manu Berrondo Grimaldo, Eduardo Brinkhof, Jesse Tatone, Ivan |
author_sort |
Larsen, Roger B. |
title |
Size selection of Greenland halibut (Reinhardtius hippoglossoides) in the Norwegian bottom trawl fishery with a newly developed double grid system |
title_short |
Size selection of Greenland halibut (Reinhardtius hippoglossoides) in the Norwegian bottom trawl fishery with a newly developed double grid system |
title_full |
Size selection of Greenland halibut (Reinhardtius hippoglossoides) in the Norwegian bottom trawl fishery with a newly developed double grid system |
title_fullStr |
Size selection of Greenland halibut (Reinhardtius hippoglossoides) in the Norwegian bottom trawl fishery with a newly developed double grid system |
title_full_unstemmed |
Size selection of Greenland halibut (Reinhardtius hippoglossoides) in the Norwegian bottom trawl fishery with a newly developed double grid system |
title_sort |
size selection of greenland halibut (reinhardtius hippoglossoides) in the norwegian bottom trawl fishery with a newly developed double grid system |
publisher |
Northwest Atlantic Fisheries Organization (NAFO) |
publishDate |
2017 |
url |
https://hdl.handle.net/10037/13566 https://doi.org/10.2960/J.v49.m715 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Northeast Atlantic |
genre_facet |
Greenland Northeast Atlantic |
op_relation |
Journal of Northwest Atlantic Fishery Science info:eu-repo/grantAgreement/RCN/MARINFORSK/243627/Norway/Managing trawl catches by improving the hydrodynamic performance of sorting grid sections and codends// Larsen, 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.m715 FRIDAID 1537297 doi:10.2960/J.v49.m715 0250-6408 1813-1859 https://hdl.handle.net/10037/13566 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.2960/J.v49.m715 |
container_title |
Journal of Northwest Atlantic Fishery Science |
container_volume |
49 |
container_start_page |
39 |
op_container_end_page |
48 |
_version_ |
1766011837282779136 |