Effect of stream regulation on population parameters of atlantic salmon [ Salmo salar L.] in the river Lærdalselva, western Norway
Abstract The river Lærdalselva, West Norway, was regulated in the autumn of 1974. Regulation led to an increase in winter flow and a decrease in summer flow in a section where there was natural production of salmon. A slight decrease in summer temperature was also recorded in the uppermost part of t...
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crwiley:10.1002/rrr.3450040403 2024-06-02T08:03:31+00:00 Effect of stream regulation on population parameters of atlantic salmon [ Salmo salar L.] in the river Lærdalselva, western Norway Brooks, R. J. Nielsen, P. S. Saltveit, S. J. 1989 http://dx.doi.org/10.1002/rrr.3450040403 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frrr.3450040403 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rrr.3450040403 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Regulated Rivers: Research & Management volume 4, issue 4, page 347-354 ISSN 0886-9375 1099-1646 journal-article 1989 crwiley https://doi.org/10.1002/rrr.3450040403 2024-05-03T11:16:08Z Abstract The river Lærdalselva, West Norway, was regulated in the autumn of 1974. Regulation led to an increase in winter flow and a decrease in summer flow in a section where there was natural production of salmon. A slight decrease in summer temperature was also recorded in the uppermost part of this section. No data existed on juvenile Atlantic salmon before regulation and the regulation effect on juvenile fish population parameters is therefore based on samples taken from adult salmon in the period 1969 to 1984. No differences in growth, smolt age, and smolt size which could be related to the regulation of the river were found. The smallest mean sizes of yearlings (0+) were found in 1964 and 1967. After regulation the mean size was never lower than before. Mean smolt age was between 3–1 and 3–9 years, but after regulation never exceeded that found before. River growth was slow, three year old smolts growing faster than four year old smolts. However, there were no differences in river growth before and after regulation. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Norway Regulated Rivers: Research & Management 4 4 347 354 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The river Lærdalselva, West Norway, was regulated in the autumn of 1974. Regulation led to an increase in winter flow and a decrease in summer flow in a section where there was natural production of salmon. A slight decrease in summer temperature was also recorded in the uppermost part of this section. No data existed on juvenile Atlantic salmon before regulation and the regulation effect on juvenile fish population parameters is therefore based on samples taken from adult salmon in the period 1969 to 1984. No differences in growth, smolt age, and smolt size which could be related to the regulation of the river were found. The smallest mean sizes of yearlings (0+) were found in 1964 and 1967. After regulation the mean size was never lower than before. Mean smolt age was between 3–1 and 3–9 years, but after regulation never exceeded that found before. River growth was slow, three year old smolts growing faster than four year old smolts. However, there were no differences in river growth before and after regulation. |
format |
Article in Journal/Newspaper |
author |
Brooks, R. J. Nielsen, P. S. Saltveit, S. J. |
spellingShingle |
Brooks, R. J. Nielsen, P. S. Saltveit, S. J. Effect of stream regulation on population parameters of atlantic salmon [ Salmo salar L.] in the river Lærdalselva, western Norway |
author_facet |
Brooks, R. J. Nielsen, P. S. Saltveit, S. J. |
author_sort |
Brooks, R. J. |
title |
Effect of stream regulation on population parameters of atlantic salmon [ Salmo salar L.] in the river Lærdalselva, western Norway |
title_short |
Effect of stream regulation on population parameters of atlantic salmon [ Salmo salar L.] in the river Lærdalselva, western Norway |
title_full |
Effect of stream regulation on population parameters of atlantic salmon [ Salmo salar L.] in the river Lærdalselva, western Norway |
title_fullStr |
Effect of stream regulation on population parameters of atlantic salmon [ Salmo salar L.] in the river Lærdalselva, western Norway |
title_full_unstemmed |
Effect of stream regulation on population parameters of atlantic salmon [ Salmo salar L.] in the river Lærdalselva, western Norway |
title_sort |
effect of stream regulation on population parameters of atlantic salmon [ salmo salar l.] in the river lærdalselva, western norway |
publisher |
Wiley |
publishDate |
1989 |
url |
http://dx.doi.org/10.1002/rrr.3450040403 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frrr.3450040403 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rrr.3450040403 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Regulated Rivers: Research & Management volume 4, issue 4, page 347-354 ISSN 0886-9375 1099-1646 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/rrr.3450040403 |
container_title |
Regulated Rivers: Research & Management |
container_volume |
4 |
container_issue |
4 |
container_start_page |
347 |
op_container_end_page |
354 |
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1800748073228435456 |