Water discharge affects Atlantic salmon Salmo salarsmolt production: a 27 year study in the River Orkla, Norway
A model that explains 48% of the annual variation in Atlantic salmon Salmo salar smolt production in the River Orkla, Norway, has been established. This variation could be explained by egg deposition, minimum daily discharge during the previous winter and minimum weekly discharge during the summer 3...
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Online Access: | http://dx.doi.org/10.1111/jfb.12542 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfb.12542 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.12542 |
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crwiley:10.1111/jfb.12542 2024-06-23T07:51:19+00:00 Water discharge affects Atlantic salmon Salmo salarsmolt production: a 27 year study in the River Orkla, Norway Hvidsten, N. A. Diserud, O. H. Jensen, A. J. Jensås, J. G. Johnsen, B. O. Ugedal, O. Norwegian Concession Fund the Norwegian Environment Agency the Norwegian Institute for Nature Research Orkla Fellesforvaltning the Norwegian Water Resources and Electricity Board the Norwegian Electricity Industry 2014 http://dx.doi.org/10.1111/jfb.12542 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfb.12542 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.12542 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 86, issue 1, page 92-104 ISSN 0022-1112 1095-8649 journal-article 2014 crwiley https://doi.org/10.1111/jfb.12542 2024-06-11T04:42:53Z A model that explains 48% of the annual variation in Atlantic salmon Salmo salar smolt production in the River Orkla, Norway, has been established. This variation could be explained by egg deposition, minimum daily discharge during the previous winter and minimum weekly discharge during the summer 3 years before smolt migration. All coefficients in the model were positive, which indicates that more eggs and higher minimum discharge levels during the winter before smolt migration and the summer after hatching benefit smolt production. Hence, when the spawning target of the river is reached, the minimum levels of river discharge, in both winter and summer, are the main bottlenecks for the parr survival, and hence for smolt production. The River Orkla was developed for hydropower production in the early 1980s by the construction of four reservoirs upstream of the river stretch accessible to S. salar . Although no water has been removed from the catchment, the dynamics of water flow has been altered, mainly by increasing discharges during winter and reducing spring floods. In spite of the higher than natural winter discharges, minimum winter discharge is still a determinant of smolt production. Hence, in regulated rivers, the maintenance of discharges to ensure that they are as high as possible during dry periods is an important means of securing high S. salar smolt production. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Norway Orkla ENVELOPE(9.831,9.831,63.311,63.311) Journal of Fish Biology 86 1 92 104 |
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Open Polar |
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Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
A model that explains 48% of the annual variation in Atlantic salmon Salmo salar smolt production in the River Orkla, Norway, has been established. This variation could be explained by egg deposition, minimum daily discharge during the previous winter and minimum weekly discharge during the summer 3 years before smolt migration. All coefficients in the model were positive, which indicates that more eggs and higher minimum discharge levels during the winter before smolt migration and the summer after hatching benefit smolt production. Hence, when the spawning target of the river is reached, the minimum levels of river discharge, in both winter and summer, are the main bottlenecks for the parr survival, and hence for smolt production. The River Orkla was developed for hydropower production in the early 1980s by the construction of four reservoirs upstream of the river stretch accessible to S. salar . Although no water has been removed from the catchment, the dynamics of water flow has been altered, mainly by increasing discharges during winter and reducing spring floods. In spite of the higher than natural winter discharges, minimum winter discharge is still a determinant of smolt production. Hence, in regulated rivers, the maintenance of discharges to ensure that they are as high as possible during dry periods is an important means of securing high S. salar smolt production. |
author2 |
Norwegian Concession Fund the Norwegian Environment Agency the Norwegian Institute for Nature Research Orkla Fellesforvaltning the Norwegian Water Resources and Electricity Board the Norwegian Electricity Industry |
format |
Article in Journal/Newspaper |
author |
Hvidsten, N. A. Diserud, O. H. Jensen, A. J. Jensås, J. G. Johnsen, B. O. Ugedal, O. |
spellingShingle |
Hvidsten, N. A. Diserud, O. H. Jensen, A. J. Jensås, J. G. Johnsen, B. O. Ugedal, O. Water discharge affects Atlantic salmon Salmo salarsmolt production: a 27 year study in the River Orkla, Norway |
author_facet |
Hvidsten, N. A. Diserud, O. H. Jensen, A. J. Jensås, J. G. Johnsen, B. O. Ugedal, O. |
author_sort |
Hvidsten, N. A. |
title |
Water discharge affects Atlantic salmon Salmo salarsmolt production: a 27 year study in the River Orkla, Norway |
title_short |
Water discharge affects Atlantic salmon Salmo salarsmolt production: a 27 year study in the River Orkla, Norway |
title_full |
Water discharge affects Atlantic salmon Salmo salarsmolt production: a 27 year study in the River Orkla, Norway |
title_fullStr |
Water discharge affects Atlantic salmon Salmo salarsmolt production: a 27 year study in the River Orkla, Norway |
title_full_unstemmed |
Water discharge affects Atlantic salmon Salmo salarsmolt production: a 27 year study in the River Orkla, Norway |
title_sort |
water discharge affects atlantic salmon salmo salarsmolt production: a 27 year study in the river orkla, norway |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/jfb.12542 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfb.12542 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.12542 |
long_lat |
ENVELOPE(9.831,9.831,63.311,63.311) |
geographic |
Norway Orkla |
geographic_facet |
Norway Orkla |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Journal of Fish Biology volume 86, issue 1, page 92-104 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/jfb.12542 |
container_title |
Journal of Fish Biology |
container_volume |
86 |
container_issue |
1 |
container_start_page |
92 |
op_container_end_page |
104 |
_version_ |
1802642377508126720 |