Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod ( Gadus morhua )
Fish pots have lower catch efficiency than gillnets and trwls and, therefore, are rarely used for catching Atlantic cod ( Gadus morhua ) and similar species. Fish-retention devices (FRDs), non-return devices that permit fish to enter the pot while impending exit, reduce the pot exit rate and therefo...
Published in: | ICES Journal of Marine Science |
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2021
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Online Access: | https://orbit.dtu.dk/en/publications/86d85bc8-7d63-4b0a-8d5b-7da849b18606 https://doi.org/10.1093/icesjms/fsaa214 https://backend.orbit.dtu.dk/ws/files/222795780/ICESJMS_2020_373_Proof_hi.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/86d85bc8-7d63-4b0a-8d5b-7da849b18606 2024-06-23T07:51:04+00:00 Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod ( Gadus morhua ) Chladek, Jérôme Stepputtis, Daniel Hermann, Andreas Ljungberg, Peter Rodriguez-Tress, Paco Santos, Juan Svendsen, Jon Christian 2021 application/pdf https://orbit.dtu.dk/en/publications/86d85bc8-7d63-4b0a-8d5b-7da849b18606 https://doi.org/10.1093/icesjms/fsaa214 https://backend.orbit.dtu.dk/ws/files/222795780/ICESJMS_2020_373_Proof_hi.pdf eng eng https://orbit.dtu.dk/en/publications/86d85bc8-7d63-4b0a-8d5b-7da849b18606 info:eu-repo/semantics/openAccess Chladek , J , Stepputtis , D , Hermann , A , Ljungberg , P , Rodriguez-Tress , P , Santos , J & Svendsen , J C 2021 , ' Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod ( Gadus morhua ) ' , ICES Journal of Marine Science , vol. 78 , no. 1 , fsaa214 , pp. 199-219 . https://doi.org/10.1093/icesjms/fsaa214 Catch efficiency Fish-gear interaction Fish pots Fish-retention device Passive fishing gear Pot entry-to-exit ratio article 2021 ftdtupubl https://doi.org/10.1093/icesjms/fsaa214 2024-06-11T14:55:44Z Fish pots have lower catch efficiency than gillnets and trwls and, therefore, are rarely used for catching Atlantic cod ( Gadus morhua ) and similar species. Fish-retention devices (FRDs), non-return devices that permit fish to enter the pot while impending exit, reduce the pot exit rate and therefor can increase catches. Conventional FRDs, however, also reduce entry rate and may not improve catches. To increase pot-catch efficiency, we developed and tested a new trigger-type FRD, made of transparent acrylic glass, which we named acrylic fingers (AFs). AFs are almost invisible underwater and offer little resistance to entering cod. We compared AFs with Neptune fingers (NFs), a conventional trigger-type FRD with a distinct visual outline, by observing cod entry and exit rates through both triggertypes rigged to a pot in a net pen. Both trigger types significantly reduced exit rates compared with a funnel without triggers; however, NFs also reduced entry rates by visually deterring od. Specifically, AFs have higher entry-to-exit ratios and therefore improve catch efficiency. Combining AFs with funnels further increased catch efficiency. Thus, transparent acrylic triggers present a promising new approach to increasing pot-catch efficiency and may increase the uptake of the cod pot, an environmentally low-impact gear. Article in Journal/Newspaper atlantic cod Gadus morhua Technical University of Denmark: DTU Orbit ICES Journal of Marine Science 78 1 199 219 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Catch efficiency Fish-gear interaction Fish pots Fish-retention device Passive fishing gear Pot entry-to-exit ratio |
spellingShingle |
Catch efficiency Fish-gear interaction Fish pots Fish-retention device Passive fishing gear Pot entry-to-exit ratio Chladek, Jérôme Stepputtis, Daniel Hermann, Andreas Ljungberg, Peter Rodriguez-Tress, Paco Santos, Juan Svendsen, Jon Christian Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod ( Gadus morhua ) |
topic_facet |
Catch efficiency Fish-gear interaction Fish pots Fish-retention device Passive fishing gear Pot entry-to-exit ratio |
description |
Fish pots have lower catch efficiency than gillnets and trwls and, therefore, are rarely used for catching Atlantic cod ( Gadus morhua ) and similar species. Fish-retention devices (FRDs), non-return devices that permit fish to enter the pot while impending exit, reduce the pot exit rate and therefor can increase catches. Conventional FRDs, however, also reduce entry rate and may not improve catches. To increase pot-catch efficiency, we developed and tested a new trigger-type FRD, made of transparent acrylic glass, which we named acrylic fingers (AFs). AFs are almost invisible underwater and offer little resistance to entering cod. We compared AFs with Neptune fingers (NFs), a conventional trigger-type FRD with a distinct visual outline, by observing cod entry and exit rates through both triggertypes rigged to a pot in a net pen. Both trigger types significantly reduced exit rates compared with a funnel without triggers; however, NFs also reduced entry rates by visually deterring od. Specifically, AFs have higher entry-to-exit ratios and therefore improve catch efficiency. Combining AFs with funnels further increased catch efficiency. Thus, transparent acrylic triggers present a promising new approach to increasing pot-catch efficiency and may increase the uptake of the cod pot, an environmentally low-impact gear. |
format |
Article in Journal/Newspaper |
author |
Chladek, Jérôme Stepputtis, Daniel Hermann, Andreas Ljungberg, Peter Rodriguez-Tress, Paco Santos, Juan Svendsen, Jon Christian |
author_facet |
Chladek, Jérôme Stepputtis, Daniel Hermann, Andreas Ljungberg, Peter Rodriguez-Tress, Paco Santos, Juan Svendsen, Jon Christian |
author_sort |
Chladek, Jérôme |
title |
Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod ( Gadus morhua ) |
title_short |
Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod ( Gadus morhua ) |
title_full |
Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod ( Gadus morhua ) |
title_fullStr |
Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod ( Gadus morhua ) |
title_full_unstemmed |
Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod ( Gadus morhua ) |
title_sort |
development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for atlantic cod ( gadus morhua ) |
publishDate |
2021 |
url |
https://orbit.dtu.dk/en/publications/86d85bc8-7d63-4b0a-8d5b-7da849b18606 https://doi.org/10.1093/icesjms/fsaa214 https://backend.orbit.dtu.dk/ws/files/222795780/ICESJMS_2020_373_Proof_hi.pdf |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Chladek , J , Stepputtis , D , Hermann , A , Ljungberg , P , Rodriguez-Tress , P , Santos , J & Svendsen , J C 2021 , ' Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod ( Gadus morhua ) ' , ICES Journal of Marine Science , vol. 78 , no. 1 , fsaa214 , pp. 199-219 . https://doi.org/10.1093/icesjms/fsaa214 |
op_relation |
https://orbit.dtu.dk/en/publications/86d85bc8-7d63-4b0a-8d5b-7da849b18606 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/icesjms/fsaa214 |
container_title |
ICES Journal of Marine Science |
container_volume |
78 |
container_issue |
1 |
container_start_page |
199 |
op_container_end_page |
219 |
_version_ |
1802642058454761472 |