A retrospective assessment of the flow regulation of the West Salmon River, Newfoundland, Canada
The Upper Salmon Hydroelectric Project in central Newfoundland, Canada, constructed in the early 1980s, affected the hydrology of the West Salmon River, a major spawning and juvenile rearing river for landlocked Atlantic salmon, Salmo salar L., and brook trout, Salvelinus fontinalis (Mitchill). A co...
Published in: | Fisheries Management and Ecology |
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crwiley:10.1046/j.1365-2400.1997.t01-1-00099.x 2024-06-02T08:03:42+00:00 A retrospective assessment of the flow regulation of the West Salmon River, Newfoundland, Canada SCRUTON, D. A. LEDREW, L. J. 1997 http://dx.doi.org/10.1046/j.1365-2400.1997.t01-1-00099.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2400.1997.t01-1-00099.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2400.1997.t01-1-00099.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Fisheries Management and Ecology volume 4, issue 6, page 467-480 ISSN 0969-997X 1365-2400 journal-article 1997 crwiley https://doi.org/10.1046/j.1365-2400.1997.t01-1-00099.x 2024-05-03T11:58:53Z The Upper Salmon Hydroelectric Project in central Newfoundland, Canada, constructed in the early 1980s, affected the hydrology of the West Salmon River, a major spawning and juvenile rearing river for landlocked Atlantic salmon, Salmo salar L., and brook trout, Salvelinus fontinalis (Mitchill). A controlled flow release strategy, based on Tennant’s Montana method, was developed to protect this habitat and prescribed a release of 40% of the mean annual flow (MAF) (2.6 m 3 s –1 ) between 1 June and 30 November and 20% of the MAF (1.3 m 3 s –1 ) from 1 December to 31 May. Studies were conducted to assess the impact of river regulation including: (1) a post‐impoundment evaluation of the anticipated geomorphic and sedimentary characteristics; (2) monitoring of juvenile fish populations under regulation; and (3) a retrospective IFIM (instream flow incremental methodology) assessment. Studies provided evidence of the initial stages of river aggradation. Biological monitoring found no apparent effects of sediment deposition on spawning and egg incubation. However, densities of older age classes (parr, 1+ and greater) declined under regulation, possibly related to poor overwintering conditions under the lower winter flow. IFIM study results supported these observations and indicated that the prescribed flow regimen provided habitat conditions that would benefit salmon fry more than older age classes. This retrospective assessment suggested that future proposals for flow regulation in Newfoundland should consider the need for more dynamic flow management as well as to provide overwintering habitat for resident fish. Habitat–hydraulic models are preferred to standard setting approaches owing to more detailed analysis of habitat trade‐offs as related to flow regulation. Article in Journal/Newspaper Atlantic salmon Newfoundland Salmo salar Wiley Online Library Canada Fisheries Management and Ecology 4 6 467 480 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The Upper Salmon Hydroelectric Project in central Newfoundland, Canada, constructed in the early 1980s, affected the hydrology of the West Salmon River, a major spawning and juvenile rearing river for landlocked Atlantic salmon, Salmo salar L., and brook trout, Salvelinus fontinalis (Mitchill). A controlled flow release strategy, based on Tennant’s Montana method, was developed to protect this habitat and prescribed a release of 40% of the mean annual flow (MAF) (2.6 m 3 s –1 ) between 1 June and 30 November and 20% of the MAF (1.3 m 3 s –1 ) from 1 December to 31 May. Studies were conducted to assess the impact of river regulation including: (1) a post‐impoundment evaluation of the anticipated geomorphic and sedimentary characteristics; (2) monitoring of juvenile fish populations under regulation; and (3) a retrospective IFIM (instream flow incremental methodology) assessment. Studies provided evidence of the initial stages of river aggradation. Biological monitoring found no apparent effects of sediment deposition on spawning and egg incubation. However, densities of older age classes (parr, 1+ and greater) declined under regulation, possibly related to poor overwintering conditions under the lower winter flow. IFIM study results supported these observations and indicated that the prescribed flow regimen provided habitat conditions that would benefit salmon fry more than older age classes. This retrospective assessment suggested that future proposals for flow regulation in Newfoundland should consider the need for more dynamic flow management as well as to provide overwintering habitat for resident fish. Habitat–hydraulic models are preferred to standard setting approaches owing to more detailed analysis of habitat trade‐offs as related to flow regulation. |
format |
Article in Journal/Newspaper |
author |
SCRUTON, D. A. LEDREW, L. J. |
spellingShingle |
SCRUTON, D. A. LEDREW, L. J. A retrospective assessment of the flow regulation of the West Salmon River, Newfoundland, Canada |
author_facet |
SCRUTON, D. A. LEDREW, L. J. |
author_sort |
SCRUTON, D. A. |
title |
A retrospective assessment of the flow regulation of the West Salmon River, Newfoundland, Canada |
title_short |
A retrospective assessment of the flow regulation of the West Salmon River, Newfoundland, Canada |
title_full |
A retrospective assessment of the flow regulation of the West Salmon River, Newfoundland, Canada |
title_fullStr |
A retrospective assessment of the flow regulation of the West Salmon River, Newfoundland, Canada |
title_full_unstemmed |
A retrospective assessment of the flow regulation of the West Salmon River, Newfoundland, Canada |
title_sort |
retrospective assessment of the flow regulation of the west salmon river, newfoundland, canada |
publisher |
Wiley |
publishDate |
1997 |
url |
http://dx.doi.org/10.1046/j.1365-2400.1997.t01-1-00099.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1365-2400.1997.t01-1-00099.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1365-2400.1997.t01-1-00099.x |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Atlantic salmon Newfoundland Salmo salar |
genre_facet |
Atlantic salmon Newfoundland Salmo salar |
op_source |
Fisheries Management and Ecology volume 4, issue 6, page 467-480 ISSN 0969-997X 1365-2400 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1365-2400.1997.t01-1-00099.x |
container_title |
Fisheries Management and Ecology |
container_volume |
4 |
container_issue |
6 |
container_start_page |
467 |
op_container_end_page |
480 |
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1800748312614141952 |