Variable trends in the distribution of Atlantic cod (Gadus morhua) in the Celtic seas
Publication history: Accepted - 20 February 2024; Published online - 12 March 2024. Despite decades of active fisheries management, many stocks of Atlantic cod in its southern range are in a depleted state and mortality estimates remain high. Recovery of these stocks, as defined by management areas,...
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ftafbinst:oai:afbi.dspacedirect.org:20.500.12518/682 2024-04-21T07:56:40+00:00 Variable trends in the distribution of Atlantic cod (Gadus morhua) in the Celtic seas Ellis, Jonathan V. Schuchert, Pia Scantlebury, D. Michael Marshall, C. Tara Fernandes, Paul G. Fisheries and Aquatic Ecosystems 2024-03-12 application/pdf https://hdl.handle.net/20.500.12518/682 https://doi.org/10.1111/jfb.15715 en eng Wiley https://hdl.handle.net/20.500.12518/682 Ellis, J.V., Schuchert, P., Scantlebury, D.M., Marshall, C.T. and Fernandes, P.G. (2024) ‘Variable trends in the distribution of Atlantic cod (Gadus morhua) in the Celtic seas’, Journal of Fish Biology. Wiley. Available at: https://doi.org/10.1111/jfb.15715. 0022-1112 1095-8649 (electronic) https://doi.org/10.1111/jfb.15715 © 2024 The Authors. Journal of Fish Biology published by John Wiley & Sons Ltd on behalf of Fisheries Society of the British Isles. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Atlantic cod Celtic seas distribution shifts stock decline Article 2024 ftafbinst https://doi.org/20.500.12518/68210.1111/jfb.15715 2024-03-26T18:02:54Z Publication history: Accepted - 20 February 2024; Published online - 12 March 2024. Despite decades of active fisheries management, many stocks of Atlantic cod in its southern range are in a depleted state and mortality estimates remain high. Recovery of these stocks, as defined by management areas, could be confounded by cod distributions shifting outside of these areas. Here, we assess data from internationally coordinated trawl surveys to investigate the distribution of three cod stocks in the Celtic Seas ecoregion, Irish Sea, Celtic Sea, and West of Scotland, from 1985 to 2021. We mapped cod densities, analyzed trends in mean weighted depth and bottom temperature, and calculated the center of gravity and equivalent area of the stocks. The distribution of the West of Scotland stock shifted north and east, spilling into the North Sea, while the Irish Sea and Celtic Sea stocks shifted west. Each stock showed decreasing trends in equivalent area, but there were no clear trends in the average depth occupied by the fish. There was no apparent relationship between temperature and the distribution of cod, as bottom temperature varied little from 1993 to 2021. Although Irish Sea cod showed a shift into warmer water, this was due to changes in survey distribution. The shift in distribution of the West of Scotland cod stock towards the North Sea whilst impairing local recovery provides further justification for the recent definition of its incorporation into a larger stock unit that includes the northwest of the North Sea. The Irish Sea and Celtic Sea cod stocks are neither shifting northwards, nor into deeper waters, but remained within current boundaries. This suggests that recent temperature conditions did not affect their distribution, but this may change as temperatures increase towards the limit for reproduction. This research was supported by a Department of Agriculture, Environment and Rural Affairs for Northern Ireland postgraduate studentship. Article in Journal/Newspaper atlantic cod Gadus morhua AFBI Repository (Agri-Food and Biosciences Institute) Journal of Fish Biology |
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Open Polar |
collection |
AFBI Repository (Agri-Food and Biosciences Institute) |
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language |
English |
topic |
Atlantic cod Celtic seas distribution shifts stock decline |
spellingShingle |
Atlantic cod Celtic seas distribution shifts stock decline Ellis, Jonathan V. Schuchert, Pia Scantlebury, D. Michael Marshall, C. Tara Fernandes, Paul G. Variable trends in the distribution of Atlantic cod (Gadus morhua) in the Celtic seas |
topic_facet |
Atlantic cod Celtic seas distribution shifts stock decline |
description |
Publication history: Accepted - 20 February 2024; Published online - 12 March 2024. Despite decades of active fisheries management, many stocks of Atlantic cod in its southern range are in a depleted state and mortality estimates remain high. Recovery of these stocks, as defined by management areas, could be confounded by cod distributions shifting outside of these areas. Here, we assess data from internationally coordinated trawl surveys to investigate the distribution of three cod stocks in the Celtic Seas ecoregion, Irish Sea, Celtic Sea, and West of Scotland, from 1985 to 2021. We mapped cod densities, analyzed trends in mean weighted depth and bottom temperature, and calculated the center of gravity and equivalent area of the stocks. The distribution of the West of Scotland stock shifted north and east, spilling into the North Sea, while the Irish Sea and Celtic Sea stocks shifted west. Each stock showed decreasing trends in equivalent area, but there were no clear trends in the average depth occupied by the fish. There was no apparent relationship between temperature and the distribution of cod, as bottom temperature varied little from 1993 to 2021. Although Irish Sea cod showed a shift into warmer water, this was due to changes in survey distribution. The shift in distribution of the West of Scotland cod stock towards the North Sea whilst impairing local recovery provides further justification for the recent definition of its incorporation into a larger stock unit that includes the northwest of the North Sea. The Irish Sea and Celtic Sea cod stocks are neither shifting northwards, nor into deeper waters, but remained within current boundaries. This suggests that recent temperature conditions did not affect their distribution, but this may change as temperatures increase towards the limit for reproduction. This research was supported by a Department of Agriculture, Environment and Rural Affairs for Northern Ireland postgraduate studentship. |
author2 |
Fisheries and Aquatic Ecosystems |
format |
Article in Journal/Newspaper |
author |
Ellis, Jonathan V. Schuchert, Pia Scantlebury, D. Michael Marshall, C. Tara Fernandes, Paul G. |
author_facet |
Ellis, Jonathan V. Schuchert, Pia Scantlebury, D. Michael Marshall, C. Tara Fernandes, Paul G. |
author_sort |
Ellis, Jonathan V. |
title |
Variable trends in the distribution of Atlantic cod (Gadus morhua) in the Celtic seas |
title_short |
Variable trends in the distribution of Atlantic cod (Gadus morhua) in the Celtic seas |
title_full |
Variable trends in the distribution of Atlantic cod (Gadus morhua) in the Celtic seas |
title_fullStr |
Variable trends in the distribution of Atlantic cod (Gadus morhua) in the Celtic seas |
title_full_unstemmed |
Variable trends in the distribution of Atlantic cod (Gadus morhua) in the Celtic seas |
title_sort |
variable trends in the distribution of atlantic cod (gadus morhua) in the celtic seas |
publisher |
Wiley |
publishDate |
2024 |
url |
https://hdl.handle.net/20.500.12518/682 https://doi.org/10.1111/jfb.15715 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
https://hdl.handle.net/20.500.12518/682 Ellis, J.V., Schuchert, P., Scantlebury, D.M., Marshall, C.T. and Fernandes, P.G. (2024) ‘Variable trends in the distribution of Atlantic cod (Gadus morhua) in the Celtic seas’, Journal of Fish Biology. Wiley. Available at: https://doi.org/10.1111/jfb.15715. 0022-1112 1095-8649 (electronic) https://doi.org/10.1111/jfb.15715 |
op_rights |
© 2024 The Authors. Journal of Fish Biology published by John Wiley & Sons Ltd on behalf of Fisheries Society of the British Isles. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_doi |
https://doi.org/20.500.12518/68210.1111/jfb.15715 |
container_title |
Journal of Fish Biology |
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1796938591706808320 |