Understanding the release efficiency of Atlantic cod (Gadus morhua) from trawls with a square mesh panel: effects of panel area, panel position, and stimulation of escape response
Based on size selectivity data for more than 25 000 cod (Gadus morhua) collected during experimental trawl fishing with six different codends, all of which included a square mesh panel, we investigated the effect on cod-release efficiency based on the size of the square mesh panel area, position of...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2015
|
Subjects: | |
Online Access: | https://doi.org/10.1093/icesjms/fsu124 https://www.openagrar.de/receive/timport_mods_00029912 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029912/dn053652.pdf |
id |
ftopenagrar:oai:www.openagrar.de:timport_mods_00029912 |
---|---|
record_format |
openpolar |
spelling |
ftopenagrar:oai:www.openagrar.de:timport_mods_00029912 2024-09-15T17:55:34+00:00 Understanding the release efficiency of Atlantic cod (Gadus morhua) from trawls with a square mesh panel: effects of panel area, panel position, and stimulation of escape response Herrmann, Bent Wienbeck, Harald Karlsen, Junita Stepputtis, Daniel Dahm, Erdmann Moderhak, Waldemar 2015 https://doi.org/10.1093/icesjms/fsu124 https://www.openagrar.de/receive/timport_mods_00029912 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029912/dn053652.pdf eng eng ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/DOI:10.1093/icesjms/fsu124 https://www.openagrar.de/receive/timport_mods_00029912 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029912/dn053652.pdf only signed in user info:eu-repo/semantics/restrictedAccess article Text BACOMA cod (Gadus morhua) escape behaviour escape efficiency square mesh panels stimulation of escape article Text doc-type:article 2015 ftopenagrar https://doi.org/10.1093/icesjms/fsu124 2024-07-08T23:56:24Z Based on size selectivity data for more than 25 000 cod (Gadus morhua) collected during experimental trawl fishing with six different codends, all of which included a square mesh panel, we investigated the effect on cod-release efficiency based on the size of the square mesh panel area, position of the square mesh panel, and stimulation of the escape response. Based on the results, we were able to explain why the BACOMA codend, applied in the Baltic Sea cod directed trawl fishery, releases juvenile cod efficiently, whereas other designs, including a square mesh panel with similar mesh size, are less efficient. Our main findings reveal that the release efficiency of the square mesh panel in the BACOMA codend depends largely on the overlap of the square mesh panel and the catch-accumulation zone in the codend, where cod do not have the option of just drifting further back in the trawl when proximate to the panel. On the contrary, the reduction in panel size by 50% did not significantly affect the release efficiency when the panel overlapped with the catch-accumulation zone. It was possible to stimulate an escape response for cod to achieve a release through a square mesh panel positioned away from the catch-accumulation zone. Our findings demonstrated that this release was as efficient as for a panel mounted in the catch-accumulation zone of the codend. Devices that stimulate behaviour may improve the release efficiency of cod through square mesh panels in other fisheries where this is a problem. Article in Journal/Newspaper atlantic cod Gadus morhua OpenAgrar (OA) ICES Journal of Marine Science 72 2 686 696 |
institution |
Open Polar |
collection |
OpenAgrar (OA) |
op_collection_id |
ftopenagrar |
language |
English |
topic |
article Text BACOMA cod (Gadus morhua) escape behaviour escape efficiency square mesh panels stimulation of escape |
spellingShingle |
article Text BACOMA cod (Gadus morhua) escape behaviour escape efficiency square mesh panels stimulation of escape Herrmann, Bent Wienbeck, Harald Karlsen, Junita Stepputtis, Daniel Dahm, Erdmann Moderhak, Waldemar Understanding the release efficiency of Atlantic cod (Gadus morhua) from trawls with a square mesh panel: effects of panel area, panel position, and stimulation of escape response |
topic_facet |
article Text BACOMA cod (Gadus morhua) escape behaviour escape efficiency square mesh panels stimulation of escape |
description |
Based on size selectivity data for more than 25 000 cod (Gadus morhua) collected during experimental trawl fishing with six different codends, all of which included a square mesh panel, we investigated the effect on cod-release efficiency based on the size of the square mesh panel area, position of the square mesh panel, and stimulation of the escape response. Based on the results, we were able to explain why the BACOMA codend, applied in the Baltic Sea cod directed trawl fishery, releases juvenile cod efficiently, whereas other designs, including a square mesh panel with similar mesh size, are less efficient. Our main findings reveal that the release efficiency of the square mesh panel in the BACOMA codend depends largely on the overlap of the square mesh panel and the catch-accumulation zone in the codend, where cod do not have the option of just drifting further back in the trawl when proximate to the panel. On the contrary, the reduction in panel size by 50% did not significantly affect the release efficiency when the panel overlapped with the catch-accumulation zone. It was possible to stimulate an escape response for cod to achieve a release through a square mesh panel positioned away from the catch-accumulation zone. Our findings demonstrated that this release was as efficient as for a panel mounted in the catch-accumulation zone of the codend. Devices that stimulate behaviour may improve the release efficiency of cod through square mesh panels in other fisheries where this is a problem. |
format |
Article in Journal/Newspaper |
author |
Herrmann, Bent Wienbeck, Harald Karlsen, Junita Stepputtis, Daniel Dahm, Erdmann Moderhak, Waldemar |
author_facet |
Herrmann, Bent Wienbeck, Harald Karlsen, Junita Stepputtis, Daniel Dahm, Erdmann Moderhak, Waldemar |
author_sort |
Herrmann, Bent |
title |
Understanding the release efficiency of Atlantic cod (Gadus morhua) from trawls with a square mesh panel: effects of panel area, panel position, and stimulation of escape response |
title_short |
Understanding the release efficiency of Atlantic cod (Gadus morhua) from trawls with a square mesh panel: effects of panel area, panel position, and stimulation of escape response |
title_full |
Understanding the release efficiency of Atlantic cod (Gadus morhua) from trawls with a square mesh panel: effects of panel area, panel position, and stimulation of escape response |
title_fullStr |
Understanding the release efficiency of Atlantic cod (Gadus morhua) from trawls with a square mesh panel: effects of panel area, panel position, and stimulation of escape response |
title_full_unstemmed |
Understanding the release efficiency of Atlantic cod (Gadus morhua) from trawls with a square mesh panel: effects of panel area, panel position, and stimulation of escape response |
title_sort |
understanding the release efficiency of atlantic cod (gadus morhua) from trawls with a square mesh panel: effects of panel area, panel position, and stimulation of escape response |
publishDate |
2015 |
url |
https://doi.org/10.1093/icesjms/fsu124 https://www.openagrar.de/receive/timport_mods_00029912 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029912/dn053652.pdf |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/DOI:10.1093/icesjms/fsu124 https://www.openagrar.de/receive/timport_mods_00029912 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029912/dn053652.pdf |
op_rights |
only signed in user info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1093/icesjms/fsu124 |
container_title |
ICES Journal of Marine Science |
container_volume |
72 |
container_issue |
2 |
container_start_page |
686 |
op_container_end_page |
696 |
_version_ |
1810431842267955200 |