Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends?
Shortening codend lastridge ropes can be an effective fishing gear modification to improve the size selection properties in diamond mesh codends. Lastridge ropes attached to codend selvedges withstand the longitudinal forces created by the catch building up and therefore, prevent the codend meshes f...
Published in: | Fisheries Research |
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Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2023
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Online Access: | https://orbit.dtu.dk/en/publications/c4b951d7-8339-4fed-927c-75bf05eb5d29 https://doi.org/10.1016/j.fishres.2023.106671 https://backend.orbit.dtu.dk/ws/files/310493049/1_s2.0_S0165783623000644_main.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/c4b951d7-8339-4fed-927c-75bf05eb5d29 2024-09-15T17:58:00+00:00 Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? Sistiaga, Manu Herrmann, Bent Brinkhof, Jesse Larsen, Roger B. Santos, Juan Stepputtis, Daniel Brinkhof, Ilmar Jacques, Nadine Cerbule, Kristine Petetta, Andrea Cuende, Elsa Kvalvik, Liz 2023 application/pdf https://orbit.dtu.dk/en/publications/c4b951d7-8339-4fed-927c-75bf05eb5d29 https://doi.org/10.1016/j.fishres.2023.106671 https://backend.orbit.dtu.dk/ws/files/310493049/1_s2.0_S0165783623000644_main.pdf eng eng https://orbit.dtu.dk/en/publications/c4b951d7-8339-4fed-927c-75bf05eb5d29 info:eu-repo/semantics/openAccess Sistiaga , M , Herrmann , B , Brinkhof , J , Larsen , R B , Santos , J , Stepputtis , D , Brinkhof , I , Jacques , N , Cerbule , K , Petetta , A , Cuende , E & Kvalvik , L 2023 , ' Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? ' , Fisheries Research , vol. 262 , 106671 . https://doi.org/10.1016/j.fishres.2023.106671 Shortened lastridge rope Size selectivity Codend Trawl Demersal finfish fishery /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2023 ftdtupubl https://doi.org/10.1016/j.fishres.2023.106671 2024-08-13T00:03:06Z Shortening codend lastridge ropes can be an effective fishing gear modification to improve the size selection properties in diamond mesh codends. Lastridge ropes attached to codend selvedges withstand the longitudinal forces created by the catch building up and therefore, prevent the codend meshes from closing. However, the extent to which the lastridge ropes should be shortened to maximize the effect of this measure is unclear. Besides opening codend meshes, shortening lastridge ropes can also lead to net folding, which can potentially have negative consequences for size selectivity. In the present study, we tested the size selective properties of a 129 mm diamond mesh codend in three different configurations: 0 %, 15 % and 30 % shortened lastridge ropes. Selectivity data were collected for cod ( Gadus morhua ), haddock ( Melanogrammus aeglefinus ) and redfish ( Sebastes spp.) in the Barents Sea gadoid bottom trawl fishery. Shortening the lastridge ropes by 15 % had a significant effect on the release efficiency of haddock between 35 and 50 cm, whereas to obtain a similar result for cod, the lastridge ropes had to be shortened by 30 %. However, the use of shortened lastridge ropes significantly increased the retention of fish below 35 cm for both species, especially when the lastridge ropes were shortened from 15 % to 30 %. The effect on redfish size selectivity was in general limited. Exploitation pattern indicators showed that there was no added benefit from shortening them further from 15 % to 30 % for any of the three species. This study concludes that, while shortening lastridge ropes can contribute to improved size selection of diamond mesh codends, reducing them beyond 15 % is not recommended because it can substantially increase the retention of undersized fish, probably due to net folding. Article in Journal/Newspaper Barents Sea Gadus morhua Technical University of Denmark: DTU Orbit Fisheries Research 262 106671 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Shortened lastridge rope Size selectivity Codend Trawl Demersal finfish fishery /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
Shortened lastridge rope Size selectivity Codend Trawl Demersal finfish fishery /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Sistiaga, Manu Herrmann, Bent Brinkhof, Jesse Larsen, Roger B. Santos, Juan Stepputtis, Daniel Brinkhof, Ilmar Jacques, Nadine Cerbule, Kristine Petetta, Andrea Cuende, Elsa Kvalvik, Liz Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? |
topic_facet |
Shortened lastridge rope Size selectivity Codend Trawl Demersal finfish fishery /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
Shortening codend lastridge ropes can be an effective fishing gear modification to improve the size selection properties in diamond mesh codends. Lastridge ropes attached to codend selvedges withstand the longitudinal forces created by the catch building up and therefore, prevent the codend meshes from closing. However, the extent to which the lastridge ropes should be shortened to maximize the effect of this measure is unclear. Besides opening codend meshes, shortening lastridge ropes can also lead to net folding, which can potentially have negative consequences for size selectivity. In the present study, we tested the size selective properties of a 129 mm diamond mesh codend in three different configurations: 0 %, 15 % and 30 % shortened lastridge ropes. Selectivity data were collected for cod ( Gadus morhua ), haddock ( Melanogrammus aeglefinus ) and redfish ( Sebastes spp.) in the Barents Sea gadoid bottom trawl fishery. Shortening the lastridge ropes by 15 % had a significant effect on the release efficiency of haddock between 35 and 50 cm, whereas to obtain a similar result for cod, the lastridge ropes had to be shortened by 30 %. However, the use of shortened lastridge ropes significantly increased the retention of fish below 35 cm for both species, especially when the lastridge ropes were shortened from 15 % to 30 %. The effect on redfish size selectivity was in general limited. Exploitation pattern indicators showed that there was no added benefit from shortening them further from 15 % to 30 % for any of the three species. This study concludes that, while shortening lastridge ropes can contribute to improved size selection of diamond mesh codends, reducing them beyond 15 % is not recommended because it can substantially increase the retention of undersized fish, probably due to net folding. |
format |
Article in Journal/Newspaper |
author |
Sistiaga, Manu Herrmann, Bent Brinkhof, Jesse Larsen, Roger B. Santos, Juan Stepputtis, Daniel Brinkhof, Ilmar Jacques, Nadine Cerbule, Kristine Petetta, Andrea Cuende, Elsa Kvalvik, Liz |
author_facet |
Sistiaga, Manu Herrmann, Bent Brinkhof, Jesse Larsen, Roger B. Santos, Juan Stepputtis, Daniel Brinkhof, Ilmar Jacques, Nadine Cerbule, Kristine Petetta, Andrea Cuende, Elsa Kvalvik, Liz |
author_sort |
Sistiaga, Manu |
title |
Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? |
title_short |
Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? |
title_full |
Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? |
title_fullStr |
Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? |
title_full_unstemmed |
Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? |
title_sort |
is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? |
publishDate |
2023 |
url |
https://orbit.dtu.dk/en/publications/c4b951d7-8339-4fed-927c-75bf05eb5d29 https://doi.org/10.1016/j.fishres.2023.106671 https://backend.orbit.dtu.dk/ws/files/310493049/1_s2.0_S0165783623000644_main.pdf |
genre |
Barents Sea Gadus morhua |
genre_facet |
Barents Sea Gadus morhua |
op_source |
Sistiaga , M , Herrmann , B , Brinkhof , J , Larsen , R B , Santos , J , Stepputtis , D , Brinkhof , I , Jacques , N , Cerbule , K , Petetta , A , Cuende , E & Kvalvik , L 2023 , ' Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? ' , Fisheries Research , vol. 262 , 106671 . https://doi.org/10.1016/j.fishres.2023.106671 |
op_relation |
https://orbit.dtu.dk/en/publications/c4b951d7-8339-4fed-927c-75bf05eb5d29 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.fishres.2023.106671 |
container_title |
Fisheries Research |
container_volume |
262 |
container_start_page |
106671 |
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1810434214841024512 |