Assessing the occurrence of egg stranding for trout and salmon in a regulated river
A key challenge in many regulated rivers is to define adequate flow levels to protect aquatic organisms. Provisioning of suitable flow can be pivotal bottlenecks for fishes such as salmon and trout that use the riverbed as an incubation habitat. Additionally, the locations where females spawn will d...
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Language: | English |
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Online Access: | https://hdl.handle.net/11250/3087938 https://doi.org/10.1002/rra.4099 |
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ftnorce:oai:norceresearch.brage.unit.no:11250/3087938 2023-10-09T21:49:56+02:00 Assessing the occurrence of egg stranding for trout and salmon in a regulated river Skoglund, Helge Vollset, Knut Wiik Wiers, Tore Barlaup, Bjørn Torgeir 2023 application/pdf https://hdl.handle.net/11250/3087938 https://doi.org/10.1002/rra.4099 eng eng Rivers Research and Applications: an international journal devoted to river research and management. 2023, 39 (4), 768-776. urn:issn:1535-1459 https://hdl.handle.net/11250/3087938 https://doi.org/10.1002/rra.4099 cristin:2134558 Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no © Author(s) 2023 Rivers Research and Applications: an international journal devoted to river research and management 39 4 768-776 Peer reviewed Journal article 2023 ftnorce https://doi.org/10.1002/rra.4099 2023-09-13T22:49:53Z A key challenge in many regulated rivers is to define adequate flow levels to protect aquatic organisms. Provisioning of suitable flow can be pivotal bottlenecks for fishes such as salmon and trout that use the riverbed as an incubation habitat. Additionally, the locations where females spawn will define the probability that embryos will be dewatered during the incubation period in a regulated flow regime. We investigated the water flow, dewatering, and incubation mortality in Atlantic salmon and brown trout in natural nests over 19 years in the regulated Bjoreio River in western Norway. During the study period, different flow strategies were applied to mitigate the dewatering of incubating salmon and trout embryos. Average survival in nests sampled in late winter ranged from 54% to 92% among years and was significantly correlated with the minimum water flow occurring during the incubation period. Mortality was significantly higher in nests in shallow areas, reflecting nests exposed to dewatering. The results demonstrate a strong link between incubation mortality and managed flow regimes for river spawning salmonids. Using detailed information on the nest location and incubation mortality, we estimate minimum flow requirements for this river and demonstrate an approach to effectively mitigate the impact of river regulations on embryo survival in Atlantic salmon and brown trout. publishedVersion Article in Journal/Newspaper Atlantic salmon NORCE vitenarkiv (Norwegian Research Centre) Norway River Research and Applications 39 4 768 776 |
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Open Polar |
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NORCE vitenarkiv (Norwegian Research Centre) |
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ftnorce |
language |
English |
description |
A key challenge in many regulated rivers is to define adequate flow levels to protect aquatic organisms. Provisioning of suitable flow can be pivotal bottlenecks for fishes such as salmon and trout that use the riverbed as an incubation habitat. Additionally, the locations where females spawn will define the probability that embryos will be dewatered during the incubation period in a regulated flow regime. We investigated the water flow, dewatering, and incubation mortality in Atlantic salmon and brown trout in natural nests over 19 years in the regulated Bjoreio River in western Norway. During the study period, different flow strategies were applied to mitigate the dewatering of incubating salmon and trout embryos. Average survival in nests sampled in late winter ranged from 54% to 92% among years and was significantly correlated with the minimum water flow occurring during the incubation period. Mortality was significantly higher in nests in shallow areas, reflecting nests exposed to dewatering. The results demonstrate a strong link between incubation mortality and managed flow regimes for river spawning salmonids. Using detailed information on the nest location and incubation mortality, we estimate minimum flow requirements for this river and demonstrate an approach to effectively mitigate the impact of river regulations on embryo survival in Atlantic salmon and brown trout. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Skoglund, Helge Vollset, Knut Wiik Wiers, Tore Barlaup, Bjørn Torgeir |
spellingShingle |
Skoglund, Helge Vollset, Knut Wiik Wiers, Tore Barlaup, Bjørn Torgeir Assessing the occurrence of egg stranding for trout and salmon in a regulated river |
author_facet |
Skoglund, Helge Vollset, Knut Wiik Wiers, Tore Barlaup, Bjørn Torgeir |
author_sort |
Skoglund, Helge |
title |
Assessing the occurrence of egg stranding for trout and salmon in a regulated river |
title_short |
Assessing the occurrence of egg stranding for trout and salmon in a regulated river |
title_full |
Assessing the occurrence of egg stranding for trout and salmon in a regulated river |
title_fullStr |
Assessing the occurrence of egg stranding for trout and salmon in a regulated river |
title_full_unstemmed |
Assessing the occurrence of egg stranding for trout and salmon in a regulated river |
title_sort |
assessing the occurrence of egg stranding for trout and salmon in a regulated river |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3087938 https://doi.org/10.1002/rra.4099 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Rivers Research and Applications: an international journal devoted to river research and management 39 4 768-776 |
op_relation |
Rivers Research and Applications: an international journal devoted to river research and management. 2023, 39 (4), 768-776. urn:issn:1535-1459 https://hdl.handle.net/11250/3087938 https://doi.org/10.1002/rra.4099 cristin:2134558 |
op_rights |
Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no © Author(s) 2023 |
op_doi |
https://doi.org/10.1002/rra.4099 |
container_title |
River Research and Applications |
container_volume |
39 |
container_issue |
4 |
container_start_page |
768 |
op_container_end_page |
776 |
_version_ |
1779312982983966720 |