Who is fishing on what stock: population-of-origin of individual cod (Gadus morhua) in commercial and recreational fisheries
Abstract Atlantic cod (Gadus morhua) in Skagerrak are structured into distinct ecotypes or stock components that have been severely depleted over the past decades. To improve our understanding of how local commercial and recreational fisheries influence cod stocks, we investigated whether these user...
Published in: | ICES Journal of Marine Science |
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Format: | Article in Journal/Newspaper |
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2018
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsy080 http://academic.oup.com/icesjms/article-pdf/75/6/2153/31237698/fsy080.pdf |
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croxfordunivpr:10.1093/icesjms/fsy080 2024-09-15T17:55:32+00:00 Who is fishing on what stock: population-of-origin of individual cod (Gadus morhua) in commercial and recreational fisheries Jorde, Per Erik Kleiven, Alf Ring Sodeland, Marte Olsen, Esben Moland Ferter, Keno Jentoft, Sissel Knutsen, Halvor Grant, W Stewart Norwegian Research Council Sørlandet Knowledge Foundation European Regional Development Fund 2018 http://dx.doi.org/10.1093/icesjms/fsy080 http://academic.oup.com/icesjms/article-pdf/75/6/2153/31237698/fsy080.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model ICES Journal of Marine Science volume 75, issue 6, page 2153-2162 ISSN 1054-3139 1095-9289 journal-article 2018 croxfordunivpr https://doi.org/10.1093/icesjms/fsy080 2024-08-12T04:25:06Z Abstract Atlantic cod (Gadus morhua) in Skagerrak are structured into distinct ecotypes or stock components that have been severely depleted over the past decades. To improve our understanding of how local commercial and recreational fisheries influence cod stocks, we investigated whether these user groups target different stock components of cod. Cod were sampled from the recreational rod and line fishery and from commercial shrimp trawlers catching cod as by-catch. Based on a large set of single nucleotide polymorphisms (SNPs), we defined a subset of 27 semi-diagnostic SNPs designed to discriminate between two cod stock components: “inner fjord” cod and “North Sea” cod, designated by their dominant habitat preferences. Genetic assignments of fishery-caught cod indicated that 4% of individuals caught by shrimp trawlers belonged to the inner fjord cod component and 96% to the North Sea, whereas among cod caught by recreational fishers, the estimated percentages were 11.8 and 88.2%, respectively. Our findings confirm the existence of two sympatric cod stock components in coastal Skagerrak, indicating that existing management units are biologically inappropriate and should be reconsidered. Furthermore, more attention should be given to recreational angling to reduce fishing mortality on the depleted inner fjord cod component. Article in Journal/Newspaper atlantic cod Gadus morhua Oxford University Press ICES Journal of Marine Science 75 6 2153 2162 |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
Abstract Atlantic cod (Gadus morhua) in Skagerrak are structured into distinct ecotypes or stock components that have been severely depleted over the past decades. To improve our understanding of how local commercial and recreational fisheries influence cod stocks, we investigated whether these user groups target different stock components of cod. Cod were sampled from the recreational rod and line fishery and from commercial shrimp trawlers catching cod as by-catch. Based on a large set of single nucleotide polymorphisms (SNPs), we defined a subset of 27 semi-diagnostic SNPs designed to discriminate between two cod stock components: “inner fjord” cod and “North Sea” cod, designated by their dominant habitat preferences. Genetic assignments of fishery-caught cod indicated that 4% of individuals caught by shrimp trawlers belonged to the inner fjord cod component and 96% to the North Sea, whereas among cod caught by recreational fishers, the estimated percentages were 11.8 and 88.2%, respectively. Our findings confirm the existence of two sympatric cod stock components in coastal Skagerrak, indicating that existing management units are biologically inappropriate and should be reconsidered. Furthermore, more attention should be given to recreational angling to reduce fishing mortality on the depleted inner fjord cod component. |
author2 |
Grant, W Stewart Norwegian Research Council Sørlandet Knowledge Foundation European Regional Development Fund |
format |
Article in Journal/Newspaper |
author |
Jorde, Per Erik Kleiven, Alf Ring Sodeland, Marte Olsen, Esben Moland Ferter, Keno Jentoft, Sissel Knutsen, Halvor |
spellingShingle |
Jorde, Per Erik Kleiven, Alf Ring Sodeland, Marte Olsen, Esben Moland Ferter, Keno Jentoft, Sissel Knutsen, Halvor Who is fishing on what stock: population-of-origin of individual cod (Gadus morhua) in commercial and recreational fisheries |
author_facet |
Jorde, Per Erik Kleiven, Alf Ring Sodeland, Marte Olsen, Esben Moland Ferter, Keno Jentoft, Sissel Knutsen, Halvor |
author_sort |
Jorde, Per Erik |
title |
Who is fishing on what stock: population-of-origin of individual cod (Gadus morhua) in commercial and recreational fisheries |
title_short |
Who is fishing on what stock: population-of-origin of individual cod (Gadus morhua) in commercial and recreational fisheries |
title_full |
Who is fishing on what stock: population-of-origin of individual cod (Gadus morhua) in commercial and recreational fisheries |
title_fullStr |
Who is fishing on what stock: population-of-origin of individual cod (Gadus morhua) in commercial and recreational fisheries |
title_full_unstemmed |
Who is fishing on what stock: population-of-origin of individual cod (Gadus morhua) in commercial and recreational fisheries |
title_sort |
who is fishing on what stock: population-of-origin of individual cod (gadus morhua) in commercial and recreational fisheries |
publisher |
Oxford University Press (OUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1093/icesjms/fsy080 http://academic.oup.com/icesjms/article-pdf/75/6/2153/31237698/fsy080.pdf |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
ICES Journal of Marine Science volume 75, issue 6, page 2153-2162 ISSN 1054-3139 1095-9289 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/icesjms/fsy080 |
container_title |
ICES Journal of Marine Science |
container_volume |
75 |
container_issue |
6 |
container_start_page |
2153 |
op_container_end_page |
2162 |
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1810431809605861376 |