Short sea migration and precocious maturation in reared Atlantic salmon post-smolts in the northern Baltic Sea
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...
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Online Access: | http://jukuri.luke.fi/handle/10024/541255 |
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ftluke:oai:jukuri.luke.fi:10024/541255 2023-10-09T21:49:55+02:00 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 Department of Biological and Environmental Science, University of Jyväskylä Natural History Museum, University of Jyväskylä Luke / Luonnonvarat ja biotuotanto / Ekosysteemit ja ekologia / Vaelluskalojen ekologia (4100100314) 4100100314 Sekä painettu, että verkkojulkaisu 1063–1070 false http://jukuri.luke.fi/handle/10024/541255 eng eng International Council for the Exploration of the Sea, ICES ICES Journal of Marine Science doi:10.1093/icesjms/fsx213 1054-3139 3 75 http://jukuri.luke.fi/handle/10024/541255 life cycle migration rivers Salmo salar maturity life history regulated rivers sea-age at maturity stocking fi=A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä|sv=A1 Originalartikel i en vetenskaplig tidskrift|en=A1 Journal article (refereed), original research| ftluke https://doi.org/10.1093/icesjms/fsx213 2023-09-12T20:26:31Z 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. 2017 Article in Journal/Newspaper Atlantic salmon Salmo salar Natural Resources Institute Finland: Jukuri ICES Journal of Marine Science 75 3 1063 1070 |
institution |
Open Polar |
collection |
Natural Resources Institute Finland: Jukuri |
op_collection_id |
ftluke |
language |
English |
topic |
life cycle migration rivers Salmo salar maturity life history regulated rivers sea-age at maturity stocking |
spellingShingle |
life cycle migration rivers Salmo salar maturity life history regulated rivers sea-age at maturity stocking 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 |
life cycle migration rivers Salmo salar maturity life history regulated rivers sea-age at maturity stocking |
description |
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. 2017 |
author2 |
Department of Biological and Environmental Science, University of Jyväskylä Natural History Museum, University of Jyväskylä Luke / Luonnonvarat ja biotuotanto / Ekosysteemit ja ekologia / Vaelluskalojen ekologia (4100100314) 4100100314 |
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 |
International Council for the Exploration of the Sea, ICES |
url |
http://jukuri.luke.fi/handle/10024/541255 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
ICES Journal of Marine Science doi:10.1093/icesjms/fsx213 1054-3139 3 75 http://jukuri.luke.fi/handle/10024/541255 |
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_ |
1779312968263008256 |