Spawning migration of salmon and sea trout in the Tornionjoki river
In this collaborative project between the Natural Resources Institute (Luke) and the Swedish Agricultural University (SLU), the migratory behaviour and survival of Tornionjoki (Torneälv in Swedish) salmon and sea trout were studied between 2018‒2021 by the means of radiote-lemetry. Altogether, 227 a...
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Natural Resources Institute Finland (Luke)
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ftluke:oai:jukuri.luke.fi:10024/553204 2024-02-11T10:01:48+01:00 Spawning migration of salmon and sea trout in the Tornionjoki river Huusko, Riina Hellström, Gustav Jaukkuri, Mikko Palm, Stefan Romakkaniemi, Atso orcid:0000-0001-9696-117X 4100111210 Luonnonvarakeskus 53 p. true https://jukuri.luke.fi/handle/10024/553204 en eng Natural Resources Institute Finland (Luke) Natural resources and bioeconomy studies 2342-7647 29/2023 978-952-380-652-8 https://jukuri.luke.fi/handle/10024/553204 URN:ISBN:978-952-380-652-8 Spawning migration salmon health overwintering anadromous trout Baltic salmon arctic river publication fi=D4 Julkaistu kehittämis- tai tutkimusraportti taikka selvitys|sv=D4 Publicerad utvecklings eller forskningsrapport eller -utredning|en=D4 Published development or research report or study| ftluke 2024-01-25T00:07:14Z In this collaborative project between the Natural Resources Institute (Luke) and the Swedish Agricultural University (SLU), the migratory behaviour and survival of Tornionjoki (Torneälv in Swedish) salmon and sea trout were studied between 2018‒2021 by the means of radiote-lemetry. Altogether, 227 and 92 salmon were tagged at the Tornionjoki estuary and in the river, respectively. 114 sea trout were tagged in the river. Scale samples and fin clips for age-ing and genetic identification were taken from all the tagged specimens. The external condi-tion of the tagged specimen was also documented (wounds, skin colour, degree of haemor-rhage etc.). Moreover, a separate follow-up of the external condition of salmon caught in trap nets was conducted in 2020‒2021 at sea near the river mouth. The post-release behaviour of salmon tagged at the estuary was markedly different from that normally expected: a large majority (61% and 83% in 2018 and 2019, respectively) of the salmon which ascended the river after tagging aborted their riverine migration on the lower river and returned to the sea during the summer (i.e., before spawning season). Those salmon which stayed in the river until spawning time predominantly stayed on the lowermost 100 km of the river. More varying migration patterns were observed among the salmon tagged in the river. All specimens caught and tagged during the early summer of 2018 and 2019 started to drift downstream after their release and none of them was alive in the river at spawning time. However, about half of the specimens tagged in the river in early summer 2020 and 2021 continued their upstream migration and were alive in the river at spawning time. Salmon tagged in late summer 2018‒2020 stayed alive in the river and almost half of them also moved further upstream by spawning time. A large majority of salmon overwintered in the river after spawning and returned to the sea in spring. The majority of the salmon caught in the estuary had various external damages (wounds, scale losses, fin damages, ... Report Arctic Natural Resources Institute Finland: Jukuri Arctic Luke ENVELOPE(-94.855,-94.855,56.296,56.296) Tornionjoki ENVELOPE(24.153,24.153,65.813,65.813) |
institution |
Open Polar |
collection |
Natural Resources Institute Finland: Jukuri |
op_collection_id |
ftluke |
language |
English |
topic |
Spawning migration salmon health overwintering anadromous trout Baltic salmon arctic river |
spellingShingle |
Spawning migration salmon health overwintering anadromous trout Baltic salmon arctic river Huusko, Riina Hellström, Gustav Jaukkuri, Mikko Palm, Stefan Romakkaniemi, Atso Spawning migration of salmon and sea trout in the Tornionjoki river |
topic_facet |
Spawning migration salmon health overwintering anadromous trout Baltic salmon arctic river |
description |
In this collaborative project between the Natural Resources Institute (Luke) and the Swedish Agricultural University (SLU), the migratory behaviour and survival of Tornionjoki (Torneälv in Swedish) salmon and sea trout were studied between 2018‒2021 by the means of radiote-lemetry. Altogether, 227 and 92 salmon were tagged at the Tornionjoki estuary and in the river, respectively. 114 sea trout were tagged in the river. Scale samples and fin clips for age-ing and genetic identification were taken from all the tagged specimens. The external condi-tion of the tagged specimen was also documented (wounds, skin colour, degree of haemor-rhage etc.). Moreover, a separate follow-up of the external condition of salmon caught in trap nets was conducted in 2020‒2021 at sea near the river mouth. The post-release behaviour of salmon tagged at the estuary was markedly different from that normally expected: a large majority (61% and 83% in 2018 and 2019, respectively) of the salmon which ascended the river after tagging aborted their riverine migration on the lower river and returned to the sea during the summer (i.e., before spawning season). Those salmon which stayed in the river until spawning time predominantly stayed on the lowermost 100 km of the river. More varying migration patterns were observed among the salmon tagged in the river. All specimens caught and tagged during the early summer of 2018 and 2019 started to drift downstream after their release and none of them was alive in the river at spawning time. However, about half of the specimens tagged in the river in early summer 2020 and 2021 continued their upstream migration and were alive in the river at spawning time. Salmon tagged in late summer 2018‒2020 stayed alive in the river and almost half of them also moved further upstream by spawning time. A large majority of salmon overwintered in the river after spawning and returned to the sea in spring. The majority of the salmon caught in the estuary had various external damages (wounds, scale losses, fin damages, ... |
author2 |
orcid:0000-0001-9696-117X 4100111210 Luonnonvarakeskus |
format |
Report |
author |
Huusko, Riina Hellström, Gustav Jaukkuri, Mikko Palm, Stefan Romakkaniemi, Atso |
author_facet |
Huusko, Riina Hellström, Gustav Jaukkuri, Mikko Palm, Stefan Romakkaniemi, Atso |
author_sort |
Huusko, Riina |
title |
Spawning migration of salmon and sea trout in the Tornionjoki river |
title_short |
Spawning migration of salmon and sea trout in the Tornionjoki river |
title_full |
Spawning migration of salmon and sea trout in the Tornionjoki river |
title_fullStr |
Spawning migration of salmon and sea trout in the Tornionjoki river |
title_full_unstemmed |
Spawning migration of salmon and sea trout in the Tornionjoki river |
title_sort |
spawning migration of salmon and sea trout in the tornionjoki river |
publisher |
Natural Resources Institute Finland (Luke) |
url |
https://jukuri.luke.fi/handle/10024/553204 |
long_lat |
ENVELOPE(-94.855,-94.855,56.296,56.296) ENVELOPE(24.153,24.153,65.813,65.813) |
geographic |
Arctic Luke Tornionjoki |
geographic_facet |
Arctic Luke Tornionjoki |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Natural resources and bioeconomy studies 2342-7647 29/2023 978-952-380-652-8 https://jukuri.luke.fi/handle/10024/553204 URN:ISBN:978-952-380-652-8 |
_version_ |
1790597605019877376 |