Adult recaptures of farmed Atlantic salmon post-smolts allowed to escape during summer
The influence of time of escape on survival to adulthood was tested in farmed Atlantic salmon Salmo salar smolt and post-smolts. Escape events were simulated in a small fjord in western Norway during and after the natural period of smolt migration by releasing 6 groups of individually tagged smolts...
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Language: | English |
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Inter Research
2010
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Online Access: | http://hdl.handle.net/11250/117036 https://doi.org/10.3354/aei00017 |
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ftimr:oai:imr.brage.unit.no:11250/117036 2023-05-15T15:31:45+02:00 Adult recaptures of farmed Atlantic salmon post-smolts allowed to escape during summer Skilbrei, Ove 2010-12-21 application/pdf http://hdl.handle.net/11250/117036 https://doi.org/10.3354/aei00017 eng eng Inter Research urn:issn:1869-215X urn:issn:1869-7534 http://hdl.handle.net/11250/117036 http://dx.doi.org/10.3354/aei00017 147-153 1 Aquaculture Environment Interactions 2 farmed fish escape fiskerømning migration patterns vandringsmønster recapture gjenfangst VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 Journal article Peer reviewed 2010 ftimr https://doi.org/10.3354/aei00017 2021-09-23T20:16:05Z The influence of time of escape on survival to adulthood was tested in farmed Atlantic salmon Salmo salar smolt and post-smolts. Escape events were simulated in a small fjord in western Norway during and after the natural period of smolt migration by releasing 6 groups of individually tagged smolts and post-smolts (~2000 fish in each group) every second week from 27 May to 5 August 2005. With the exception of a lower return rate of the first released group (0.31%), the recapture rates were very similar (0.85 to 1.05%) and did not vary significantly with time of release. Of the 100 recaptures, 57% were 1-sea-winter (1SW) salmon, 25% were 2SW and 18% returned as 3SW salmon. Release date did not influence the sea age but affected the weights of the recaptured adults moderately. Fifty-four percent of the fish were recaptured in the vicinity of the release site, most of them in the freshwater effluent from a hydropower plant. The rest were spread along the coast of Norway and in rivers (26% of the distant recaptures) over distances of 100s of kilometres. The present study shows that farmed salmon escaped during their first summer in sea cages—after the natural time for smolt migration in spring—are still capable of adopting the marine migratory pattern of their wild conspecifics. This suggests that escapes at this time of the year are a hazard to the conservation of wild salmon populations. Article in Journal/Newspaper Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR Norway Aquaculture Environment Interactions 1 2 147 153 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
farmed fish escape fiskerømning migration patterns vandringsmønster recapture gjenfangst VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 |
spellingShingle |
farmed fish escape fiskerømning migration patterns vandringsmønster recapture gjenfangst VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 Skilbrei, Ove Adult recaptures of farmed Atlantic salmon post-smolts allowed to escape during summer |
topic_facet |
farmed fish escape fiskerømning migration patterns vandringsmønster recapture gjenfangst VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Aquaculture: 922 |
description |
The influence of time of escape on survival to adulthood was tested in farmed Atlantic salmon Salmo salar smolt and post-smolts. Escape events were simulated in a small fjord in western Norway during and after the natural period of smolt migration by releasing 6 groups of individually tagged smolts and post-smolts (~2000 fish in each group) every second week from 27 May to 5 August 2005. With the exception of a lower return rate of the first released group (0.31%), the recapture rates were very similar (0.85 to 1.05%) and did not vary significantly with time of release. Of the 100 recaptures, 57% were 1-sea-winter (1SW) salmon, 25% were 2SW and 18% returned as 3SW salmon. Release date did not influence the sea age but affected the weights of the recaptured adults moderately. Fifty-four percent of the fish were recaptured in the vicinity of the release site, most of them in the freshwater effluent from a hydropower plant. The rest were spread along the coast of Norway and in rivers (26% of the distant recaptures) over distances of 100s of kilometres. The present study shows that farmed salmon escaped during their first summer in sea cages—after the natural time for smolt migration in spring—are still capable of adopting the marine migratory pattern of their wild conspecifics. This suggests that escapes at this time of the year are a hazard to the conservation of wild salmon populations. |
format |
Article in Journal/Newspaper |
author |
Skilbrei, Ove |
author_facet |
Skilbrei, Ove |
author_sort |
Skilbrei, Ove |
title |
Adult recaptures of farmed Atlantic salmon post-smolts allowed to escape during summer |
title_short |
Adult recaptures of farmed Atlantic salmon post-smolts allowed to escape during summer |
title_full |
Adult recaptures of farmed Atlantic salmon post-smolts allowed to escape during summer |
title_fullStr |
Adult recaptures of farmed Atlantic salmon post-smolts allowed to escape during summer |
title_full_unstemmed |
Adult recaptures of farmed Atlantic salmon post-smolts allowed to escape during summer |
title_sort |
adult recaptures of farmed atlantic salmon post-smolts allowed to escape during summer |
publisher |
Inter Research |
publishDate |
2010 |
url |
http://hdl.handle.net/11250/117036 https://doi.org/10.3354/aei00017 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
147-153 1 Aquaculture Environment Interactions 2 |
op_relation |
urn:issn:1869-215X urn:issn:1869-7534 http://hdl.handle.net/11250/117036 http://dx.doi.org/10.3354/aei00017 |
op_doi |
https://doi.org/10.3354/aei00017 |
container_title |
Aquaculture Environment Interactions |
container_volume |
1 |
container_issue |
2 |
container_start_page |
147 |
op_container_end_page |
153 |
_version_ |
1766362270542069760 |