Stream Habitats and Behavioral Interactions of Underyearling and Yearling Atlantic Salmon ( Salmo salar )
From an examination of over 20 yr of data from the Northwest Miramichi River and some additional data from small tributaries to the Nashwaak River, highest densities of 100 underyearling and 80 yearling or older Atlantic salmon (Salmo salar) per 100 m 2 were found at sites where water velocities ave...
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1978
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crcansciencepubl:10.1139/f78-029 2023-12-17T10:27:15+01:00 Stream Habitats and Behavioral Interactions of Underyearling and Yearling Atlantic Salmon ( Salmo salar ) Symons, P. E. K. Heland, M. 1978 http://dx.doi.org/10.1139/f78-029 http://www.nrcresearchpress.com/doi/pdf/10.1139/f78-029 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Journal of the Fisheries Research Board of Canada volume 35, issue 2, page 175-183 ISSN 0015-296X General Medicine journal-article 1978 crcansciencepubl https://doi.org/10.1139/f78-029 2023-11-19T13:39:30Z From an examination of over 20 yr of data from the Northwest Miramichi River and some additional data from small tributaries to the Nashwaak River, highest densities of 100 underyearling and 80 yearling or older Atlantic salmon (Salmo salar) per 100 m 2 were found at sites where water velocities averaged 50–65 cm/s. At sites with lower or higher water velocities maximum observed densities decreased. Experiments in laboratory streams demonstrated that underyearling Atlantic salmon < 7 cm (total length) occurred in shallow (10–15 cm) pebbly (1.6–6.4 cm diam) riffles of natural streams by choice. As they grew they began to prefer deeper (> 30 cm) riffles with boulders (> 25.6 cm diam). Yearlings > 10 cm reduced the numbers of underyearlings < 6 cm in these deeper habitats by chasing them, and occasionally by catching and eating them. Social interactions, such as displays used in territorial defence, did not occur between yearlings and underyearlings until the latter exceeded 6.5 cm, the size at which they began to move to deeper riffles. Planting densities for hatchery-reared salmon recommended in the literature were refined, taking the space and habitat requirements of different-sized juvenile salmon into account. Key words: spatial relations, rearing capacity, stocking density, stream ecology Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing (via Crossref) Journal of the Fisheries Research Board of Canada 35 2 175 183 |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
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English |
topic |
General Medicine |
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General Medicine Symons, P. E. K. Heland, M. Stream Habitats and Behavioral Interactions of Underyearling and Yearling Atlantic Salmon ( Salmo salar ) |
topic_facet |
General Medicine |
description |
From an examination of over 20 yr of data from the Northwest Miramichi River and some additional data from small tributaries to the Nashwaak River, highest densities of 100 underyearling and 80 yearling or older Atlantic salmon (Salmo salar) per 100 m 2 were found at sites where water velocities averaged 50–65 cm/s. At sites with lower or higher water velocities maximum observed densities decreased. Experiments in laboratory streams demonstrated that underyearling Atlantic salmon < 7 cm (total length) occurred in shallow (10–15 cm) pebbly (1.6–6.4 cm diam) riffles of natural streams by choice. As they grew they began to prefer deeper (> 30 cm) riffles with boulders (> 25.6 cm diam). Yearlings > 10 cm reduced the numbers of underyearlings < 6 cm in these deeper habitats by chasing them, and occasionally by catching and eating them. Social interactions, such as displays used in territorial defence, did not occur between yearlings and underyearlings until the latter exceeded 6.5 cm, the size at which they began to move to deeper riffles. Planting densities for hatchery-reared salmon recommended in the literature were refined, taking the space and habitat requirements of different-sized juvenile salmon into account. Key words: spatial relations, rearing capacity, stocking density, stream ecology |
format |
Article in Journal/Newspaper |
author |
Symons, P. E. K. Heland, M. |
author_facet |
Symons, P. E. K. Heland, M. |
author_sort |
Symons, P. E. K. |
title |
Stream Habitats and Behavioral Interactions of Underyearling and Yearling Atlantic Salmon ( Salmo salar ) |
title_short |
Stream Habitats and Behavioral Interactions of Underyearling and Yearling Atlantic Salmon ( Salmo salar ) |
title_full |
Stream Habitats and Behavioral Interactions of Underyearling and Yearling Atlantic Salmon ( Salmo salar ) |
title_fullStr |
Stream Habitats and Behavioral Interactions of Underyearling and Yearling Atlantic Salmon ( Salmo salar ) |
title_full_unstemmed |
Stream Habitats and Behavioral Interactions of Underyearling and Yearling Atlantic Salmon ( Salmo salar ) |
title_sort |
stream habitats and behavioral interactions of underyearling and yearling atlantic salmon ( salmo salar ) |
publisher |
Canadian Science Publishing |
publishDate |
1978 |
url |
http://dx.doi.org/10.1139/f78-029 http://www.nrcresearchpress.com/doi/pdf/10.1139/f78-029 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Journal of the Fisheries Research Board of Canada volume 35, issue 2, page 175-183 ISSN 0015-296X |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f78-029 |
container_title |
Journal of the Fisheries Research Board of Canada |
container_volume |
35 |
container_issue |
2 |
container_start_page |
175 |
op_container_end_page |
183 |
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1785579051336859648 |