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 |
---|---|
Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2023
|
Subjects: | |
Online Access: | https://hdl.handle.net/10037/29857 https://doi.org/10.1016/j.fishres.2023.106671 |
id |
ftunivtroemsoe:oai:munin.uit.no:10037/29857 |
---|---|
record_format |
openpolar |
spelling |
ftunivtroemsoe:oai:munin.uit.no:10037/29857 2023-09-05T13:18:26+02:00 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 Beate Kolstad 2023-02-21 https://hdl.handle.net/10037/29857 https://doi.org/10.1016/j.fishres.2023.106671 eng eng Elsevier Fisheries Research Sistiaga, Herrmann, Brinkhof, Larsen, Santos, Stepputtis, Brinkhof, Jacques, Cerbule, Petetta, Cuende, Kvalvik. Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends?. Fisheries Research. 2023;262:106671:1-13 FRIDAID 2134131 doi:10.1016/j.fishres.2023.106671 0165-7836 1872-6763 https://hdl.handle.net/10037/29857 Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2023 ftunivtroemsoe https://doi.org/10.1016/j.fishres.2023.106671 2023-08-16T23:06:45Z 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 University of Tromsø: Munin Open Research Archive Barents Sea Fisheries Research 262 106671 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
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 Beate Kolstad |
spellingShingle |
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 Beate Kolstad Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends? |
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 Beate Kolstad |
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? |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://hdl.handle.net/10037/29857 https://doi.org/10.1016/j.fishres.2023.106671 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Gadus morhua |
genre_facet |
Barents Sea Gadus morhua |
op_relation |
Fisheries Research Sistiaga, Herrmann, Brinkhof, Larsen, Santos, Stepputtis, Brinkhof, Jacques, Cerbule, Petetta, Cuende, Kvalvik. Is there a limit to the potential effects of shortening lastridge ropes on the size selectivity of diamond mesh codends?. Fisheries Research. 2023;262:106671:1-13 FRIDAID 2134131 doi:10.1016/j.fishres.2023.106671 0165-7836 1872-6763 https://hdl.handle.net/10037/29857 |
op_rights |
Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.1016/j.fishres.2023.106671 |
container_title |
Fisheries Research |
container_volume |
262 |
container_start_page |
106671 |
_version_ |
1776199388346974208 |