Short sea migration and precocious maturation in reared Atlantic salmon post-smolts in the northern Baltic Sea
Abstract Atlantic salmon (Salmo salar L.) display significant variation in life history traits, including migration patterns and age at maturity. Hatchery rearing has been shown to affect the life history, and rearing-induced changes may include unfavourable consequences, e.g. shortened sea migratio...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsx213 http://academic.oup.com/icesjms/article-pdf/75/3/1063/31237584/fsx213.pdf |
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croxfordunivpr:10.1093/icesjms/fsx213 2024-03-03T08:42:47+00:00 Short sea migration and precocious maturation in reared Atlantic salmon post-smolts in the northern Baltic Sea Orell, Panu Erkinaro, Jaakko Kiljunen, Mikko Torniainen, Jyrki Sutela, Tapio Jaukkuri, Mikko Mäki-Petäys, Aki Anderson, Emory 2017 http://dx.doi.org/10.1093/icesjms/fsx213 http://academic.oup.com/icesjms/article-pdf/75/3/1063/31237584/fsx213.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 3, page 1063-1070 ISSN 1054-3139 1095-9289 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2017 croxfordunivpr https://doi.org/10.1093/icesjms/fsx213 2024-02-05T10:33:33Z Abstract Atlantic salmon (Salmo salar L.) display significant variation in life history traits, including migration patterns and age at maturity. Hatchery rearing has been shown to affect the life history, and rearing-induced changes may include unfavourable consequences, e.g. shortened sea migration period and smaller size at maturity. We report on a new phenomenon of life history of reared Atlantic salmon in the Baltic Sea area: small-sized salmon returning to freshwater only a few months after release as smolts. These “one-sea-summer (1SS)” salmon were ca. 35 cm in length and weighed ca. 400 g, being clearly larger than smolts, but substantially smaller than one-sea-winter (1SW) salmon from the same cohorts. Almost all 1SS salmon were mature males and, at release, had been longer than the overall mean. Stable isotope analysis suggested that the 1SS salmon had been feeding in different sea areas than 1SW and multi-sea-winter salmon, likely in nearby Bothnian Bay, which is typically not a salmon feeding area. If an increasing proportion of the released salmon are not undertaking a normal marine migration (≥1SW) and are returning to estuaries and rivers as 1SS fish, the success and profitability of the reared salmon releases will decline even more than the reduced post-smolt survival is suggesting. We suggest that alternative rearing practices (e.g. enriched rearing environments and advanced diets) should be considered in hatchery production for shaping the reared smolts towards a closer resemblance to wild smolts. Article in Journal/Newspaper Atlantic salmon Salmo salar Oxford University Press ICES Journal of Marine Science 75 3 1063 1070 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Orell, Panu Erkinaro, Jaakko Kiljunen, Mikko Torniainen, Jyrki Sutela, Tapio Jaukkuri, Mikko Mäki-Petäys, Aki Short sea migration and precocious maturation in reared Atlantic salmon post-smolts in the northern Baltic Sea |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Atlantic salmon (Salmo salar L.) display significant variation in life history traits, including migration patterns and age at maturity. Hatchery rearing has been shown to affect the life history, and rearing-induced changes may include unfavourable consequences, e.g. shortened sea migration period and smaller size at maturity. We report on a new phenomenon of life history of reared Atlantic salmon in the Baltic Sea area: small-sized salmon returning to freshwater only a few months after release as smolts. These “one-sea-summer (1SS)” salmon were ca. 35 cm in length and weighed ca. 400 g, being clearly larger than smolts, but substantially smaller than one-sea-winter (1SW) salmon from the same cohorts. Almost all 1SS salmon were mature males and, at release, had been longer than the overall mean. Stable isotope analysis suggested that the 1SS salmon had been feeding in different sea areas than 1SW and multi-sea-winter salmon, likely in nearby Bothnian Bay, which is typically not a salmon feeding area. If an increasing proportion of the released salmon are not undertaking a normal marine migration (≥1SW) and are returning to estuaries and rivers as 1SS fish, the success and profitability of the reared salmon releases will decline even more than the reduced post-smolt survival is suggesting. We suggest that alternative rearing practices (e.g. enriched rearing environments and advanced diets) should be considered in hatchery production for shaping the reared smolts towards a closer resemblance to wild smolts. |
author2 |
Anderson, Emory |
format |
Article in Journal/Newspaper |
author |
Orell, Panu Erkinaro, Jaakko Kiljunen, Mikko Torniainen, Jyrki Sutela, Tapio Jaukkuri, Mikko Mäki-Petäys, Aki |
author_facet |
Orell, Panu Erkinaro, Jaakko Kiljunen, Mikko Torniainen, Jyrki Sutela, Tapio Jaukkuri, Mikko Mäki-Petäys, Aki |
author_sort |
Orell, Panu |
title |
Short sea migration and precocious maturation in reared Atlantic salmon post-smolts in the northern Baltic Sea |
title_short |
Short sea migration and precocious maturation in reared Atlantic salmon post-smolts in the northern Baltic Sea |
title_full |
Short sea migration and precocious maturation in reared Atlantic salmon post-smolts in the northern Baltic Sea |
title_fullStr |
Short sea migration and precocious maturation in reared Atlantic salmon post-smolts in the northern Baltic Sea |
title_full_unstemmed |
Short sea migration and precocious maturation in reared Atlantic salmon post-smolts in the northern Baltic Sea |
title_sort |
short sea migration and precocious maturation in reared atlantic salmon post-smolts in the northern baltic sea |
publisher |
Oxford University Press (OUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1093/icesjms/fsx213 http://academic.oup.com/icesjms/article-pdf/75/3/1063/31237584/fsx213.pdf |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
ICES Journal of Marine Science volume 75, issue 3, page 1063-1070 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/fsx213 |
container_title |
ICES Journal of Marine Science |
container_volume |
75 |
container_issue |
3 |
container_start_page |
1063 |
op_container_end_page |
1070 |
_version_ |
1792498240557416448 |