Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage
Abstract Atlantic salmon smolts are sensitive to disturbance during their migration and negative effects experienced in freshwater may carry over into the marine environment. In this study, smolts were PIT‐tagged and detected during their subsequent spawning migration. A generalized linear model fit...
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Online Access: | http://dx.doi.org/10.1111/fme.12628 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fme.12628 |
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crwiley:10.1111/fme.12628 2024-06-02T08:03:32+00:00 Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage Haraldstad, Tormod Johansen, Kurt Vollset, Knut Wiik 2023 http://dx.doi.org/10.1111/fme.12628 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fme.12628 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Fisheries Management and Ecology volume 30, issue 4, page 353-359 ISSN 0969-997X 1365-2400 journal-article 2023 crwiley https://doi.org/10.1111/fme.12628 2024-05-03T11:25:38Z Abstract Atlantic salmon smolts are sensitive to disturbance during their migration and negative effects experienced in freshwater may carry over into the marine environment. In this study, smolts were PIT‐tagged and detected during their subsequent spawning migration. A generalized linear model fitted to the return data predicted a return probability of 0.091 ± 0.0061 (±SE) for smolt that was released downstream of a hydropower dam. The additional effect of migrating through a Kaplan turbine associated with hydroelectric generation did not significantly reduce return rates, while the additional effect of being handled twice in a trap was significant and lowered the predicted return probability to 0.057 ± 0.0079 (±SE; model predictions from logistic regression). Catch‐mark‐recapture methods such as those using physical recapture of fish should be applied with great care to avoid multiple handling stress that may lead to reduced marine survival and biasing estimates intended to help monitor population statuses. Moreover, similar return rates in turbine and bypass migrating smolts emphasize that more knowledge is needed when evaluating mitigation actions for migratory fish at hydropower plants. Article in Journal/Newspaper Atlantic salmon Wiley Online Library Fisheries Management and Ecology 30 4 353 359 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Atlantic salmon smolts are sensitive to disturbance during their migration and negative effects experienced in freshwater may carry over into the marine environment. In this study, smolts were PIT‐tagged and detected during their subsequent spawning migration. A generalized linear model fitted to the return data predicted a return probability of 0.091 ± 0.0061 (±SE) for smolt that was released downstream of a hydropower dam. The additional effect of migrating through a Kaplan turbine associated with hydroelectric generation did not significantly reduce return rates, while the additional effect of being handled twice in a trap was significant and lowered the predicted return probability to 0.057 ± 0.0079 (±SE; model predictions from logistic regression). Catch‐mark‐recapture methods such as those using physical recapture of fish should be applied with great care to avoid multiple handling stress that may lead to reduced marine survival and biasing estimates intended to help monitor population statuses. Moreover, similar return rates in turbine and bypass migrating smolts emphasize that more knowledge is needed when evaluating mitigation actions for migratory fish at hydropower plants. |
format |
Article in Journal/Newspaper |
author |
Haraldstad, Tormod Johansen, Kurt Vollset, Knut Wiik |
spellingShingle |
Haraldstad, Tormod Johansen, Kurt Vollset, Knut Wiik Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage |
author_facet |
Haraldstad, Tormod Johansen, Kurt Vollset, Knut Wiik |
author_sort |
Haraldstad, Tormod |
title |
Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage |
title_short |
Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage |
title_full |
Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage |
title_fullStr |
Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage |
title_full_unstemmed |
Handling of wild Atlantic salmon smolts reduced marine survival more than hydropower turbine passage |
title_sort |
handling of wild atlantic salmon smolts reduced marine survival more than hydropower turbine passage |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/fme.12628 https://onlinelibrary.wiley.com/doi/pdf/10.1111/fme.12628 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Fisheries Management and Ecology volume 30, issue 4, page 353-359 ISSN 0969-997X 1365-2400 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/fme.12628 |
container_title |
Fisheries Management and Ecology |
container_volume |
30 |
container_issue |
4 |
container_start_page |
353 |
op_container_end_page |
359 |
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1800748083722584064 |