Fixed mesh shape reduces variability in codend size selection
Diamond-mesh codends are the most commonly used in demersal trawls. However, mesh geometry tends to vary in these codends during fishing, which leads to a less well-defined size selection process. This leaves one questioning the rationality of regulating exploitation patterns based on mesh size when...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2022
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Online Access: | https://orbit.dtu.dk/en/publications/fe0a2438-f485-4443-95b2-85075ad344cf https://doi.org/10.1139/cjfas-2022-0049 https://backend.orbit.dtu.dk/ws/files/278426338/cjfas_2022_0049.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/fe0a2438-f485-4443-95b2-85075ad344cf 2024-06-23T07:51:05+00:00 Fixed mesh shape reduces variability in codend size selection Bak-Jensen, Zita Herrmann, Bent Santos, Juan Jacques, Nadine Melli, Valentina Feekings, Jordan P. 2022 application/pdf https://orbit.dtu.dk/en/publications/fe0a2438-f485-4443-95b2-85075ad344cf https://doi.org/10.1139/cjfas-2022-0049 https://backend.orbit.dtu.dk/ws/files/278426338/cjfas_2022_0049.pdf eng eng https://orbit.dtu.dk/en/publications/fe0a2438-f485-4443-95b2-85075ad344cf info:eu-repo/semantics/openAccess Bak-Jensen , Z , Herrmann , B , Santos , J , Jacques , N , Melli , V & Feekings , J P 2022 , ' Fixed mesh shape reduces variability in codend size selection ' , Canadian Journal of Fisheries and Aquatic Sciences , vol. 79 , no. 11 , pp. 1820-1829 . https://doi.org/10.1139/cjfas-2022-0049 Size selection Variability Codend Diamond-mesh Mesh geometry article 2022 ftdtupubl https://doi.org/10.1139/cjfas-2022-0049 2024-06-11T15:10:13Z Diamond-mesh codends are the most commonly used in demersal trawls. However, mesh geometry tends to vary in these codends during fishing, which leads to a less well-defined size selection process. This leaves one questioning the rationality of regulating exploitation patterns based on mesh size when size selection and/or variation between hauls is highly variable. While it has been speculated and theoretically investigated how much the variability in mesh geometry may contribute to the variability in size selection, it remained to be quantified experimentally. Therefore, we compared the size selectivity of a simple diamond-mesh codend, where meshes are subjected to variation in geometry, with a rigid diamond-mesh codend, where the geometry of the meshes were kept constant. For Atlantic cod (Gadus morhua) the simple diamond-mesh codend was found to have 45% more variation in size selection than the codend with constant mesh geometry. This confirms theoretical predictions and may guide research towards codend designs with more well-defined size selection properties. Article in Journal/Newspaper atlantic cod Gadus morhua Technical University of Denmark: DTU Orbit Canadian Journal of Fisheries and Aquatic Sciences 79 11 1820 1829 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Size selection Variability Codend Diamond-mesh Mesh geometry |
spellingShingle |
Size selection Variability Codend Diamond-mesh Mesh geometry Bak-Jensen, Zita Herrmann, Bent Santos, Juan Jacques, Nadine Melli, Valentina Feekings, Jordan P. Fixed mesh shape reduces variability in codend size selection |
topic_facet |
Size selection Variability Codend Diamond-mesh Mesh geometry |
description |
Diamond-mesh codends are the most commonly used in demersal trawls. However, mesh geometry tends to vary in these codends during fishing, which leads to a less well-defined size selection process. This leaves one questioning the rationality of regulating exploitation patterns based on mesh size when size selection and/or variation between hauls is highly variable. While it has been speculated and theoretically investigated how much the variability in mesh geometry may contribute to the variability in size selection, it remained to be quantified experimentally. Therefore, we compared the size selectivity of a simple diamond-mesh codend, where meshes are subjected to variation in geometry, with a rigid diamond-mesh codend, where the geometry of the meshes were kept constant. For Atlantic cod (Gadus morhua) the simple diamond-mesh codend was found to have 45% more variation in size selection than the codend with constant mesh geometry. This confirms theoretical predictions and may guide research towards codend designs with more well-defined size selection properties. |
format |
Article in Journal/Newspaper |
author |
Bak-Jensen, Zita Herrmann, Bent Santos, Juan Jacques, Nadine Melli, Valentina Feekings, Jordan P. |
author_facet |
Bak-Jensen, Zita Herrmann, Bent Santos, Juan Jacques, Nadine Melli, Valentina Feekings, Jordan P. |
author_sort |
Bak-Jensen, Zita |
title |
Fixed mesh shape reduces variability in codend size selection |
title_short |
Fixed mesh shape reduces variability in codend size selection |
title_full |
Fixed mesh shape reduces variability in codend size selection |
title_fullStr |
Fixed mesh shape reduces variability in codend size selection |
title_full_unstemmed |
Fixed mesh shape reduces variability in codend size selection |
title_sort |
fixed mesh shape reduces variability in codend size selection |
publishDate |
2022 |
url |
https://orbit.dtu.dk/en/publications/fe0a2438-f485-4443-95b2-85075ad344cf https://doi.org/10.1139/cjfas-2022-0049 https://backend.orbit.dtu.dk/ws/files/278426338/cjfas_2022_0049.pdf |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Bak-Jensen , Z , Herrmann , B , Santos , J , Jacques , N , Melli , V & Feekings , J P 2022 , ' Fixed mesh shape reduces variability in codend size selection ' , Canadian Journal of Fisheries and Aquatic Sciences , vol. 79 , no. 11 , pp. 1820-1829 . https://doi.org/10.1139/cjfas-2022-0049 |
op_relation |
https://orbit.dtu.dk/en/publications/fe0a2438-f485-4443-95b2-85075ad344cf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1139/cjfas-2022-0049 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
79 |
container_issue |
11 |
container_start_page |
1820 |
op_container_end_page |
1829 |
_version_ |
1802642075949203456 |