External damage to trawl-caught Northeast arctic cod (Gadus morhua): Effect of codend design
Accepted manuscript version, licensed CC BY-NC-ND 4.0. Published version available at https://doi.org/10.1016/j.fishres.2019.02.009 . The purpose of this study was to investigate the extent of external damage (gear marks, pressure injuries, ecchymosis and skin abrasion) present on trawl-caught cod (...
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Online Access: | https://hdl.handle.net/10037/15031 https://doi.org/10.1016/j.fishres.2019.02.009 |
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ftunivtroemsoe:oai:munin.uit.no:10037/15031 2023-05-15T14:26:58+02:00 External damage to trawl-caught Northeast arctic cod (Gadus morhua): Effect of codend design Tveit, Guro Møen Sistiaga, Manu Berrondo Herrmann, Bent Brinkhof, Jesse 2019-02-22 https://hdl.handle.net/10037/15031 https://doi.org/10.1016/j.fishres.2019.02.009 eng eng Elsevier Fisheries Research info:eu-repo/grantAgreement/RCN/MARINFORSK/268388/Norway/Ethical capture and killing methods in trawl fisheries// Tveit, G.M., Sistiaga, M.B., Herrmann, B. & Brinkhof, J. (2019). External damage to trawl-caught Northeast arctic cod ( Gadus morhua ): Effect of codend design. Fisheries Research, 214 , 136-147. https://doi.org/10.1016/j.fishres.2019.02.009 FRIDAID 1678507 doi:10.1016/j.fishres.2019.02.009 0165-7836 1872-6763 https://hdl.handle.net/10037/15031 openAccess VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 4-panel construction Bottom trawl Cod Fish injuries Knotless codend Journal article Tidsskriftartikkel Peer reviewed 2019 ftunivtroemsoe https://doi.org/10.1016/j.fishres.2019.02.009 2021-06-25T17:56:26Z Accepted manuscript version, licensed CC BY-NC-ND 4.0. Published version available at https://doi.org/10.1016/j.fishres.2019.02.009 . The purpose of this study was to investigate the extent of external damage (gear marks, pressure injuries, ecchymosis and skin abrasion) present on trawl-caught cod (Gadus morhua) and to examine whether the extent of damage could be reduced by introducing changes in the gear. We tested whether changing the 2-panel knotted codend used by the Norwegian trawler fleet operating in the Barents Sea today to a 2-panel knotless codend or a 4-panel knotless codend could decrease the extent of external damage to the fish in the catch. We evaluated 720 fish over 12 hauls carried out with a twin trawl setup and found that the probability for cod to be without any external damage was 9.4% (4.7%–15.8%) with the codend used in the fishery today. Thus, most fish in these catches are likely to have slight or moderate damage. Gear marks were the most frequent type of damage, with only 11.5% (6.0%–18.9%) of the cod being free of this type of injury. When gear marks were not considered in the analysis, 68.4% (58.8%–78.3%) of the fish was estimated to be flawless. Replacing the knotted netting in the codend increased the probability of obtaining fish without gear marks to 15.5% (6.2%–28.0%). However, the confidence intervals were wide, and this effect was not statistically significant. For the other three damage types, the estimated effects of changing the design of the codend were small and not statistically significant. Changing from a 2- to 4-panel codend was estimated to reduce the probability for gear marks by a further 1.7% (−13.4%–16.8%). However, this increase was not significant. Overall, the two codend design changes tested in this study did not significantly decrease the external damage present on trawl-caught cod. Article in Journal/Newspaper Arctic Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod University of Tromsø: Munin Open Research Archive Arctic Barents Sea Fisheries Research 214 136 147 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 4-panel construction Bottom trawl Cod Fish injuries Knotless codend |
spellingShingle |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 4-panel construction Bottom trawl Cod Fish injuries Knotless codend Tveit, Guro Møen Sistiaga, Manu Berrondo Herrmann, Bent Brinkhof, Jesse External damage to trawl-caught Northeast arctic cod (Gadus morhua): Effect of codend design |
topic_facet |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 4-panel construction Bottom trawl Cod Fish injuries Knotless codend |
description |
Accepted manuscript version, licensed CC BY-NC-ND 4.0. Published version available at https://doi.org/10.1016/j.fishres.2019.02.009 . The purpose of this study was to investigate the extent of external damage (gear marks, pressure injuries, ecchymosis and skin abrasion) present on trawl-caught cod (Gadus morhua) and to examine whether the extent of damage could be reduced by introducing changes in the gear. We tested whether changing the 2-panel knotted codend used by the Norwegian trawler fleet operating in the Barents Sea today to a 2-panel knotless codend or a 4-panel knotless codend could decrease the extent of external damage to the fish in the catch. We evaluated 720 fish over 12 hauls carried out with a twin trawl setup and found that the probability for cod to be without any external damage was 9.4% (4.7%–15.8%) with the codend used in the fishery today. Thus, most fish in these catches are likely to have slight or moderate damage. Gear marks were the most frequent type of damage, with only 11.5% (6.0%–18.9%) of the cod being free of this type of injury. When gear marks were not considered in the analysis, 68.4% (58.8%–78.3%) of the fish was estimated to be flawless. Replacing the knotted netting in the codend increased the probability of obtaining fish without gear marks to 15.5% (6.2%–28.0%). However, the confidence intervals were wide, and this effect was not statistically significant. For the other three damage types, the estimated effects of changing the design of the codend were small and not statistically significant. Changing from a 2- to 4-panel codend was estimated to reduce the probability for gear marks by a further 1.7% (−13.4%–16.8%). However, this increase was not significant. Overall, the two codend design changes tested in this study did not significantly decrease the external damage present on trawl-caught cod. |
format |
Article in Journal/Newspaper |
author |
Tveit, Guro Møen Sistiaga, Manu Berrondo Herrmann, Bent Brinkhof, Jesse |
author_facet |
Tveit, Guro Møen Sistiaga, Manu Berrondo Herrmann, Bent Brinkhof, Jesse |
author_sort |
Tveit, Guro Møen |
title |
External damage to trawl-caught Northeast arctic cod (Gadus morhua): Effect of codend design |
title_short |
External damage to trawl-caught Northeast arctic cod (Gadus morhua): Effect of codend design |
title_full |
External damage to trawl-caught Northeast arctic cod (Gadus morhua): Effect of codend design |
title_fullStr |
External damage to trawl-caught Northeast arctic cod (Gadus morhua): Effect of codend design |
title_full_unstemmed |
External damage to trawl-caught Northeast arctic cod (Gadus morhua): Effect of codend design |
title_sort |
external damage to trawl-caught northeast arctic cod (gadus morhua): effect of codend design |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/15031 https://doi.org/10.1016/j.fishres.2019.02.009 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod |
op_relation |
Fisheries Research info:eu-repo/grantAgreement/RCN/MARINFORSK/268388/Norway/Ethical capture and killing methods in trawl fisheries// Tveit, G.M., Sistiaga, M.B., Herrmann, B. & Brinkhof, J. (2019). External damage to trawl-caught Northeast arctic cod ( Gadus morhua ): Effect of codend design. Fisheries Research, 214 , 136-147. https://doi.org/10.1016/j.fishres.2019.02.009 FRIDAID 1678507 doi:10.1016/j.fishres.2019.02.009 0165-7836 1872-6763 https://hdl.handle.net/10037/15031 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.fishres.2019.02.009 |
container_title |
Fisheries Research |
container_volume |
214 |
container_start_page |
136 |
op_container_end_page |
147 |
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1766300518372605952 |