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 trawls 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 impeding exit, reduce the pot exit rate and therefore...
Published in: | ICES Journal of Marine Science |
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ftopenagrar:oai:www.openagrar.de:openagrar_mods_00073754 2023-05-15T15:27:19+02:00 Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod (Gadus morhua) Chladek, Jerome-Christoph Stepputtis, Daniel Hermann, Andreas Ljungberg, Peter Rodriguez-Tress, Paco Santos, Juan Svendsen, Jon Christian 2021 https://doi.org/10.1093/icesjms/fsaa214 https://www.openagrar.de/receive/openagrar_mods_00073754 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00041359/dn063250.pdf eng eng ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/10.1093/icesjms/fsaa214 https://www.openagrar.de/receive/openagrar_mods_00073754 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00041359/dn063250.pdf only signed in user all rights reserved info:eu-repo/semantics/openAccess Text ddc:570 catch efficiency -- fish-gear interaction -- fish pots -- fish-retention device -- passive fishing gear -- pot entry-to-exit ratio article Text 2021 ftopenagrar https://doi.org/10.1093/icesjms/fsaa214 2023-03-06T00:08:57Z Fish pots have lower catch efficiency than gillnets and trawls 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 impeding exit, reduce the pot exit rate and therefore 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 trigger types 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 cod. 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 OpenAgrar (OA) ICES Journal of Marine Science 78 1 199 219 |
institution |
Open Polar |
collection |
OpenAgrar (OA) |
op_collection_id |
ftopenagrar |
language |
English |
topic |
Text ddc:570 catch efficiency -- fish-gear interaction -- fish pots -- fish-retention device -- passive fishing gear -- pot entry-to-exit ratio |
spellingShingle |
Text ddc:570 catch efficiency -- fish-gear interaction -- fish pots -- fish-retention device -- passive fishing gear -- pot entry-to-exit ratio Chladek, Jerome-Christoph 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 |
Text ddc:570 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 trawls 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 impeding exit, reduce the pot exit rate and therefore 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 trigger types 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 cod. 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, Jerome-Christoph Stepputtis, Daniel Hermann, Andreas Ljungberg, Peter Rodriguez-Tress, Paco Santos, Juan Svendsen, Jon Christian |
author_facet |
Chladek, Jerome-Christoph Stepputtis, Daniel Hermann, Andreas Ljungberg, Peter Rodriguez-Tress, Paco Santos, Juan Svendsen, Jon Christian |
author_sort |
Chladek, Jerome-Christoph |
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://doi.org/10.1093/icesjms/fsaa214 https://www.openagrar.de/receive/openagrar_mods_00073754 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00041359/dn063250.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/10.1093/icesjms/fsaa214 https://www.openagrar.de/receive/openagrar_mods_00073754 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00041359/dn063250.pdf |
op_rights |
only signed in user all rights reserved 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_ |
1766357762835480576 |