Is there a threshold size regulating seaward migration of brown trout and Atlantic salmon?
We investigated the influence of variation in body size and growth rate on age of smolting in Atlantic salmon and brown trout in four different Norwegian rivers. In Atlantic salmon smolt ages varied between 2 and 6 years, and in brown trout between 2 and 7 years. Smolt age was negatively correlated...
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Language: | English |
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1993
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Online Access: | http://dx.doi.org/10.1111/j.1095-8649.1993.tb00358.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1993.tb00358.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1993.tb00358.x |
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crwiley:10.1111/j.1095-8649.1993.tb00358.x 2024-09-09T19:30:05+00:00 Is there a threshold size regulating seaward migration of brown trout and Atlantic salmon? ØKland, F. Jonsson, B. Jensen, A. J. Hansen, L. P. 1993 http://dx.doi.org/10.1111/j.1095-8649.1993.tb00358.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1993.tb00358.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1993.tb00358.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 42, issue 4, page 541-550 ISSN 0022-1112 1095-8649 journal-article 1993 crwiley https://doi.org/10.1111/j.1095-8649.1993.tb00358.x 2024-08-13T04:18:52Z We investigated the influence of variation in body size and growth rate on age of smolting in Atlantic salmon and brown trout in four different Norwegian rivers. In Atlantic salmon smolt ages varied between 2 and 6 years, and in brown trout between 2 and 7 years. Smolt age was negatively correlated with parr growth, and positively correlated with smolt size. Age at smolting was more variable in the two northern than the two southern rivers. Smolt sizes and ages were also more variable in brown trout than in Atlantic salmon. Based on the observed variation in smolt size and age, we reject the hypothesis that a threshold size alone regulates age at smolting. Within populations smolt age depends on growth rate so that fast‐growing parr smolted younger and smaller than slow‐growing parr. We hypothesize that smolt size and age is a trade‐off between expected benefits and costs imposed by differences in individual growth rate. Article in Journal/Newspaper Atlantic salmon Wiley Online Library Journal of Fish Biology 42 4 541 550 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
We investigated the influence of variation in body size and growth rate on age of smolting in Atlantic salmon and brown trout in four different Norwegian rivers. In Atlantic salmon smolt ages varied between 2 and 6 years, and in brown trout between 2 and 7 years. Smolt age was negatively correlated with parr growth, and positively correlated with smolt size. Age at smolting was more variable in the two northern than the two southern rivers. Smolt sizes and ages were also more variable in brown trout than in Atlantic salmon. Based on the observed variation in smolt size and age, we reject the hypothesis that a threshold size alone regulates age at smolting. Within populations smolt age depends on growth rate so that fast‐growing parr smolted younger and smaller than slow‐growing parr. We hypothesize that smolt size and age is a trade‐off between expected benefits and costs imposed by differences in individual growth rate. |
format |
Article in Journal/Newspaper |
author |
ØKland, F. Jonsson, B. Jensen, A. J. Hansen, L. P. |
spellingShingle |
ØKland, F. Jonsson, B. Jensen, A. J. Hansen, L. P. Is there a threshold size regulating seaward migration of brown trout and Atlantic salmon? |
author_facet |
ØKland, F. Jonsson, B. Jensen, A. J. Hansen, L. P. |
author_sort |
ØKland, F. |
title |
Is there a threshold size regulating seaward migration of brown trout and Atlantic salmon? |
title_short |
Is there a threshold size regulating seaward migration of brown trout and Atlantic salmon? |
title_full |
Is there a threshold size regulating seaward migration of brown trout and Atlantic salmon? |
title_fullStr |
Is there a threshold size regulating seaward migration of brown trout and Atlantic salmon? |
title_full_unstemmed |
Is there a threshold size regulating seaward migration of brown trout and Atlantic salmon? |
title_sort |
is there a threshold size regulating seaward migration of brown trout and atlantic salmon? |
publisher |
Wiley |
publishDate |
1993 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1993.tb00358.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1993.tb00358.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1993.tb00358.x |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Journal of Fish Biology volume 42, issue 4, page 541-550 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1993.tb00358.x |
container_title |
Journal of Fish Biology |
container_volume |
42 |
container_issue |
4 |
container_start_page |
541 |
op_container_end_page |
550 |
_version_ |
1809899109512904704 |