Origin of Atlantic salmon (Salmo salar) at sea in Icelandic waters
Abstract The origin and life history of 186 Atlantic salmon caught at sea within Icelandic waters were investigated using microsatellites to assess the origin and scales and otoliths to assess freshwater and sea age. A total of 184 samples were aged using scales or otolithes or both. Most of the sam...
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Oxford University Press (OUP)
2015
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsv176 http://academic.oup.com/icesjms/article-pdf/73/6/1525/31230005/fsv176.pdf |
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croxfordunivpr:10.1093/icesjms/fsv176 2024-09-15T17:55:58+00:00 Origin of Atlantic salmon (Salmo salar) at sea in Icelandic waters Olafsson, Kristinn Einarsson, Sigurdur M. Gilbey, John Pampoulie, Christophe Hreggvidsson, Gudmundur O. Hjorleifsdottir, Sigridur Gudjonsson, Sigurdur 2015 http://dx.doi.org/10.1093/icesjms/fsv176 http://academic.oup.com/icesjms/article-pdf/73/6/1525/31230005/fsv176.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 73, issue 6, page 1525-1532 ISSN 1095-9289 1054-3139 journal-article 2015 croxfordunivpr https://doi.org/10.1093/icesjms/fsv176 2024-07-22T04:23:28Z Abstract The origin and life history of 186 Atlantic salmon caught at sea within Icelandic waters were investigated using microsatellites to assess the origin and scales and otoliths to assess freshwater and sea age. A total of 184 samples were aged using scales or otolithes or both. Most of the samples were from individuals in their first year at sea (72.8%). The freshwater age varied from 1 to 5 years with an average of 2.6 years. The most common freshwater age was 2 years (42%), with a further substantial proportion of 3-year-old fish (28%). Genetic assignment of individual fish to their most likely population of origin was performed using Bayesian genetic individual assignments with a baseline consisting of 284 Eastern Atlantic rivers and 466 sample sites genotyped at the 14 microsatellite. A total of 186 samples of salmon caught at sea were assigned to their origin. Eight samples, from post-smolts and caught close to land, were assigned as having come from Iceland. Of the remaining 178 samples, 121 individuals (68%) were from the Southern Group, i.e. from mainland Europe, the UK, and Ireland, 53 individuals (30%) were from the Northern Group, i.e. Scandinavia and Northern Russia, and 4 individuals were from Iceland (2%). Stock mixture proportions were estimated for four periods using ONCOR and cBAYES. Stock mixture analysis generally supported the individual assignments, but did not suggest a seasonal component to the distribution of salmon stocks. These results indicate that the sea south and east of Iceland are important as feeding areas for migrating Atlantic salmon, particularly for salmon originating in the UK, Ireland, and southern Europe. Furthermore, the lack of adult Icelandic fish so close to Iceland is remarkable and suggests that Atlantic salmon from Icelandic stocks are using different feeding grounds. Article in Journal/Newspaper Atlantic salmon Iceland Salmo salar Oxford University Press ICES Journal of Marine Science 73 6 1525 1532 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
Abstract The origin and life history of 186 Atlantic salmon caught at sea within Icelandic waters were investigated using microsatellites to assess the origin and scales and otoliths to assess freshwater and sea age. A total of 184 samples were aged using scales or otolithes or both. Most of the samples were from individuals in their first year at sea (72.8%). The freshwater age varied from 1 to 5 years with an average of 2.6 years. The most common freshwater age was 2 years (42%), with a further substantial proportion of 3-year-old fish (28%). Genetic assignment of individual fish to their most likely population of origin was performed using Bayesian genetic individual assignments with a baseline consisting of 284 Eastern Atlantic rivers and 466 sample sites genotyped at the 14 microsatellite. A total of 186 samples of salmon caught at sea were assigned to their origin. Eight samples, from post-smolts and caught close to land, were assigned as having come from Iceland. Of the remaining 178 samples, 121 individuals (68%) were from the Southern Group, i.e. from mainland Europe, the UK, and Ireland, 53 individuals (30%) were from the Northern Group, i.e. Scandinavia and Northern Russia, and 4 individuals were from Iceland (2%). Stock mixture proportions were estimated for four periods using ONCOR and cBAYES. Stock mixture analysis generally supported the individual assignments, but did not suggest a seasonal component to the distribution of salmon stocks. These results indicate that the sea south and east of Iceland are important as feeding areas for migrating Atlantic salmon, particularly for salmon originating in the UK, Ireland, and southern Europe. Furthermore, the lack of adult Icelandic fish so close to Iceland is remarkable and suggests that Atlantic salmon from Icelandic stocks are using different feeding grounds. |
format |
Article in Journal/Newspaper |
author |
Olafsson, Kristinn Einarsson, Sigurdur M. Gilbey, John Pampoulie, Christophe Hreggvidsson, Gudmundur O. Hjorleifsdottir, Sigridur Gudjonsson, Sigurdur |
spellingShingle |
Olafsson, Kristinn Einarsson, Sigurdur M. Gilbey, John Pampoulie, Christophe Hreggvidsson, Gudmundur O. Hjorleifsdottir, Sigridur Gudjonsson, Sigurdur Origin of Atlantic salmon (Salmo salar) at sea in Icelandic waters |
author_facet |
Olafsson, Kristinn Einarsson, Sigurdur M. Gilbey, John Pampoulie, Christophe Hreggvidsson, Gudmundur O. Hjorleifsdottir, Sigridur Gudjonsson, Sigurdur |
author_sort |
Olafsson, Kristinn |
title |
Origin of Atlantic salmon (Salmo salar) at sea in Icelandic waters |
title_short |
Origin of Atlantic salmon (Salmo salar) at sea in Icelandic waters |
title_full |
Origin of Atlantic salmon (Salmo salar) at sea in Icelandic waters |
title_fullStr |
Origin of Atlantic salmon (Salmo salar) at sea in Icelandic waters |
title_full_unstemmed |
Origin of Atlantic salmon (Salmo salar) at sea in Icelandic waters |
title_sort |
origin of atlantic salmon (salmo salar) at sea in icelandic waters |
publisher |
Oxford University Press (OUP) |
publishDate |
2015 |
url |
http://dx.doi.org/10.1093/icesjms/fsv176 http://academic.oup.com/icesjms/article-pdf/73/6/1525/31230005/fsv176.pdf |
genre |
Atlantic salmon Iceland Salmo salar |
genre_facet |
Atlantic salmon Iceland Salmo salar |
op_source |
ICES Journal of Marine Science volume 73, issue 6, page 1525-1532 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1093/icesjms/fsv176 |
container_title |
ICES Journal of Marine Science |
container_volume |
73 |
container_issue |
6 |
container_start_page |
1525 |
op_container_end_page |
1532 |
_version_ |
1810432182475292672 |