Size selectivity of redfish (Sebastes spp.) in the Northeast Atlantic using grid-based selection systems for trawls
Using experimental data and a model to predict size selection based on morphological data, we investigated size selection of redfish (Sebastes spp.) in the grid-based selection systems used in Northeast Atlantic trawls. We found that not all redfish make physical contact with the spacing between the...
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Language: | English |
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2013
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Online Access: | https://hdl.handle.net/10037/5981 https://doi.org/10.1051/alr/2013051 |
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ftunivtroemsoe:oai:munin.uit.no:10037/5981 2023-05-15T17:41:15+02:00 Size selectivity of redfish (Sebastes spp.) in the Northeast Atlantic using grid-based selection systems for trawls Herrmann, Bent Sistiaga, Manu Berrondo Larsen, Roger B. Nielsen, Kåre Nolde 2013 https://hdl.handle.net/10037/5981 https://doi.org/10.1051/alr/2013051 eng eng EDP Sciences Aquatic Living Resources 26(2013) nr. 2 s. 109-120 FRIDAID 1048867 http://dx.doi.org/10.1051/alr/2013051 0990-7440 https://hdl.handle.net/10037/5981 URN:NBN:no-uit_munin_5675 openAccess VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920::Fiskeriteknologi: 924 Journal article Tidsskriftartikkel Peer reviewed 2013 ftunivtroemsoe https://doi.org/10.1051/alr/2013051 2021-06-25T17:53:51Z Using experimental data and a model to predict size selection based on morphological data, we investigated size selection of redfish (Sebastes spp.) in the grid-based selection systems used in Northeast Atlantic trawls. We found that not all redfish make physical contact with the spacing between the bars in the sorting grids while they pass in the direction of the codend, and therefore the escapement of some undersized redfish depends on size selection in the codend. We estimate that most of the escapement in the combined selection system (consisting of a 55-mm grid and a diamond mesh codend) happens through the grid. We demonstrated that for one of the two grid systems investigated the increase in size selection obtained experimentally by increasing grid-bar spacing is well in line with what could be expected based on the morphology of redfish. However, the size selection observed experimentally was significantly lower than the size-selective potential of the grids estimated based on the morphology of redfish. By computer simulations, we show that a possible explanation for this difference could be that not all redfish that attempt to escape through the grid make their attempt with an optimal angle of attack. Article in Journal/Newspaper Northeast Atlantic University of Tromsø: Munin Open Research Archive Aquatic Living Resources 26 2 109 120 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920::Fiskeriteknologi: 924 |
spellingShingle |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920::Fiskeriteknologi: 924 Herrmann, Bent Sistiaga, Manu Berrondo Larsen, Roger B. Nielsen, Kåre Nolde Size selectivity of redfish (Sebastes spp.) in the Northeast Atlantic using grid-based selection systems for trawls |
topic_facet |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920::Fiskeriteknologi: 924 |
description |
Using experimental data and a model to predict size selection based on morphological data, we investigated size selection of redfish (Sebastes spp.) in the grid-based selection systems used in Northeast Atlantic trawls. We found that not all redfish make physical contact with the spacing between the bars in the sorting grids while they pass in the direction of the codend, and therefore the escapement of some undersized redfish depends on size selection in the codend. We estimate that most of the escapement in the combined selection system (consisting of a 55-mm grid and a diamond mesh codend) happens through the grid. We demonstrated that for one of the two grid systems investigated the increase in size selection obtained experimentally by increasing grid-bar spacing is well in line with what could be expected based on the morphology of redfish. However, the size selection observed experimentally was significantly lower than the size-selective potential of the grids estimated based on the morphology of redfish. By computer simulations, we show that a possible explanation for this difference could be that not all redfish that attempt to escape through the grid make their attempt with an optimal angle of attack. |
format |
Article in Journal/Newspaper |
author |
Herrmann, Bent Sistiaga, Manu Berrondo Larsen, Roger B. Nielsen, Kåre Nolde |
author_facet |
Herrmann, Bent Sistiaga, Manu Berrondo Larsen, Roger B. Nielsen, Kåre Nolde |
author_sort |
Herrmann, Bent |
title |
Size selectivity of redfish (Sebastes spp.) in the Northeast Atlantic using grid-based selection systems for trawls |
title_short |
Size selectivity of redfish (Sebastes spp.) in the Northeast Atlantic using grid-based selection systems for trawls |
title_full |
Size selectivity of redfish (Sebastes spp.) in the Northeast Atlantic using grid-based selection systems for trawls |
title_fullStr |
Size selectivity of redfish (Sebastes spp.) in the Northeast Atlantic using grid-based selection systems for trawls |
title_full_unstemmed |
Size selectivity of redfish (Sebastes spp.) in the Northeast Atlantic using grid-based selection systems for trawls |
title_sort |
size selectivity of redfish (sebastes spp.) in the northeast atlantic using grid-based selection systems for trawls |
publisher |
EDP Sciences |
publishDate |
2013 |
url |
https://hdl.handle.net/10037/5981 https://doi.org/10.1051/alr/2013051 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
Aquatic Living Resources 26(2013) nr. 2 s. 109-120 FRIDAID 1048867 http://dx.doi.org/10.1051/alr/2013051 0990-7440 https://hdl.handle.net/10037/5981 URN:NBN:no-uit_munin_5675 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1051/alr/2013051 |
container_title |
Aquatic Living Resources |
container_volume |
26 |
container_issue |
2 |
container_start_page |
109 |
op_container_end_page |
120 |
_version_ |
1766142713171804160 |