Regional and temporal variation in escape history of Norwegian farmed Atlantic salmon
Abstract Each year thousands of farmed Atlantic salmon escape from seawater net pens, and introgression has been documented in a range of wild populations. Due to greater experience in the wild, escapees that have been on the run for a longer period, and successfully transitioned to a wild diet (cla...
Published in: | ICES Journal of Marine Science |
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Oxford University Press (OUP)
2023
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsad184 https://academic.oup.com/icesjms/article-pdf/81/1/119/56332565/fsad184.pdf |
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croxfordunivpr:10.1093/icesjms/fsad184 2024-06-23T07:51:16+00:00 Regional and temporal variation in escape history of Norwegian farmed Atlantic salmon Strand, Nina Glover, Kevin A Meier, Sonnich Ayllon, Fernando Wennevik, Vidar Madhun, Abdullah Skaala, Øystein Hamre, Kristin Fjelldal, Per Gunnar Hansen, Tom Niemelä, Eero Knutar, Sofie Fjeldheim, Per Tommy Solberg, Monica F Grant, Stewart W Norges Forskningsråd European Commission 2023 http://dx.doi.org/10.1093/icesjms/fsad184 https://academic.oup.com/icesjms/article-pdf/81/1/119/56332565/fsad184.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ ICES Journal of Marine Science volume 81, issue 1, page 119-129 ISSN 1054-3139 1095-9289 journal-article 2023 croxfordunivpr https://doi.org/10.1093/icesjms/fsad184 2024-06-11T04:22:01Z Abstract Each year thousands of farmed Atlantic salmon escape from seawater net pens, and introgression has been documented in a range of wild populations. Due to greater experience in the wild, escapees that have been on the run for a longer period, and successfully transitioned to a wild diet (classified: “early escapees”), could potentially have a higher spawning success and contribute more to introgression than those that have been on the run for a shorter period and/or have not transitioned to a wild diet (classified: “recent escapees”). This is the first study to examine how the escape history of farmed Atlantic salmon captured in multiple rivers and coastal fisheries, varies in time and space. During 2011–2021, adult farmed escaped salmon were captured in four rivers and at six coastal sites in Norway. The level of linoleic acid, a terrestrial fatty acid high in commercial salmon feeds but low in the natural diet of wild salmon, was used to classify the farmed salmon as early or recent escapees. We observed temporal declines in the relative proportions of escaped vs. wild salmon in the catches, and the relative proportion of early vs. recent escapees in the most southern river (driven by samples from 2011 to 2015). Overall, 14% of the escaped salmon caught in the period were classified as early escapees. The relative proportion of early escapees was lower in the two southernmost rivers (21.2% and 6.30%), as compared to the coastal fisheries (40.9%) and the northernmost river (77.6%). Both aquaculture–management regulations and production strategies have likely influenced these observations. Article in Journal/Newspaper Atlantic salmon Oxford University Press Norway ICES Journal of Marine Science |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract Each year thousands of farmed Atlantic salmon escape from seawater net pens, and introgression has been documented in a range of wild populations. Due to greater experience in the wild, escapees that have been on the run for a longer period, and successfully transitioned to a wild diet (classified: “early escapees”), could potentially have a higher spawning success and contribute more to introgression than those that have been on the run for a shorter period and/or have not transitioned to a wild diet (classified: “recent escapees”). This is the first study to examine how the escape history of farmed Atlantic salmon captured in multiple rivers and coastal fisheries, varies in time and space. During 2011–2021, adult farmed escaped salmon were captured in four rivers and at six coastal sites in Norway. The level of linoleic acid, a terrestrial fatty acid high in commercial salmon feeds but low in the natural diet of wild salmon, was used to classify the farmed salmon as early or recent escapees. We observed temporal declines in the relative proportions of escaped vs. wild salmon in the catches, and the relative proportion of early vs. recent escapees in the most southern river (driven by samples from 2011 to 2015). Overall, 14% of the escaped salmon caught in the period were classified as early escapees. The relative proportion of early escapees was lower in the two southernmost rivers (21.2% and 6.30%), as compared to the coastal fisheries (40.9%) and the northernmost river (77.6%). Both aquaculture–management regulations and production strategies have likely influenced these observations. |
author2 |
Grant, Stewart W Norges Forskningsråd European Commission |
format |
Article in Journal/Newspaper |
author |
Strand, Nina Glover, Kevin A Meier, Sonnich Ayllon, Fernando Wennevik, Vidar Madhun, Abdullah Skaala, Øystein Hamre, Kristin Fjelldal, Per Gunnar Hansen, Tom Niemelä, Eero Knutar, Sofie Fjeldheim, Per Tommy Solberg, Monica F |
spellingShingle |
Strand, Nina Glover, Kevin A Meier, Sonnich Ayllon, Fernando Wennevik, Vidar Madhun, Abdullah Skaala, Øystein Hamre, Kristin Fjelldal, Per Gunnar Hansen, Tom Niemelä, Eero Knutar, Sofie Fjeldheim, Per Tommy Solberg, Monica F Regional and temporal variation in escape history of Norwegian farmed Atlantic salmon |
author_facet |
Strand, Nina Glover, Kevin A Meier, Sonnich Ayllon, Fernando Wennevik, Vidar Madhun, Abdullah Skaala, Øystein Hamre, Kristin Fjelldal, Per Gunnar Hansen, Tom Niemelä, Eero Knutar, Sofie Fjeldheim, Per Tommy Solberg, Monica F |
author_sort |
Strand, Nina |
title |
Regional and temporal variation in escape history of Norwegian farmed Atlantic salmon |
title_short |
Regional and temporal variation in escape history of Norwegian farmed Atlantic salmon |
title_full |
Regional and temporal variation in escape history of Norwegian farmed Atlantic salmon |
title_fullStr |
Regional and temporal variation in escape history of Norwegian farmed Atlantic salmon |
title_full_unstemmed |
Regional and temporal variation in escape history of Norwegian farmed Atlantic salmon |
title_sort |
regional and temporal variation in escape history of norwegian farmed atlantic salmon |
publisher |
Oxford University Press (OUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1093/icesjms/fsad184 https://academic.oup.com/icesjms/article-pdf/81/1/119/56332565/fsad184.pdf |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
ICES Journal of Marine Science volume 81, issue 1, page 119-129 ISSN 1054-3139 1095-9289 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/icesjms/fsad184 |
container_title |
ICES Journal of Marine Science |
_version_ |
1802642310173818880 |