Seasonal changes in the body composition of young riverine Atlantic salmon and brown trout
The body composition of protein and fat in Atlantic salmon Salmo salar and brown trout Salmo trutta before and after winter was investigated in a temperate, small river, normally ice covered from the middle of November until the end of March. Fat, protein and specific energy declined greatly in wint...
Published in: | Journal of Fish Biology |
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Online Access: | http://dx.doi.org/10.1111/j.1095-8649.1998.tb00971.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1998.tb00971.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1998.tb00971.x |
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crwiley:10.1111/j.1095-8649.1998.tb00971.x 2024-06-23T07:51:14+00:00 Seasonal changes in the body composition of young riverine Atlantic salmon and brown trout Berg, O. K. Bremset, G. 1998 http://dx.doi.org/10.1111/j.1095-8649.1998.tb00971.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1998.tb00971.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1998.tb00971.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 52, issue 6, page 1272-1288 ISSN 0022-1112 1095-8649 journal-article 1998 crwiley https://doi.org/10.1111/j.1095-8649.1998.tb00971.x 2024-05-31T08:13:53Z The body composition of protein and fat in Atlantic salmon Salmo salar and brown trout Salmo trutta before and after winter was investigated in a temperate, small river, normally ice covered from the middle of November until the end of March. Fat, protein and specific energy declined greatly in winter but were replenished rapidly in spring. Rates of decline were slower for the smallest fish, which also had the lowest specific content of fat, protein, and energy, while the differences in absolute amounts were greatest for the largest fish. The mean specific fat content was reduced by 45–70% during winter, relative to the pre‐winter period (September). Mean daily reductions in specific enegy of the larger size groups of brown trout (3·7 × 10 −3 kJ g −1 day −1 ) were almost half of the corresponding values for the largest Atlantic salmon (6·3 × 10 −3 kJ g −1 day −1 ) during winter. A minor reduction in protein content was found during winter, with mean reductions of 6–10% in comparison to those in September. During spring the fat content was replenished rapidly, particularly for the smallest salmon fry (a threefold increase from April to June). Fat content in the larger salmon and trout increased by about 1·8 times. Based on estimated metabolic rates, digested energy during wintertime may contribute about two‐thirds of the brown trout fry's energy demand. For Atlantic salmon, the corresponding value is about 50%. The winter period put considerable stress on the young salmonids living in lotic environments, in particular for the smallest fry with the lowest energy content before winter and the largest losses during winter. This should make the fry more vulnerable to adverse abiotic and biotic factors. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Journal of Fish Biology 52 6 1272 1288 |
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Wiley Online Library |
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English |
description |
The body composition of protein and fat in Atlantic salmon Salmo salar and brown trout Salmo trutta before and after winter was investigated in a temperate, small river, normally ice covered from the middle of November until the end of March. Fat, protein and specific energy declined greatly in winter but were replenished rapidly in spring. Rates of decline were slower for the smallest fish, which also had the lowest specific content of fat, protein, and energy, while the differences in absolute amounts were greatest for the largest fish. The mean specific fat content was reduced by 45–70% during winter, relative to the pre‐winter period (September). Mean daily reductions in specific enegy of the larger size groups of brown trout (3·7 × 10 −3 kJ g −1 day −1 ) were almost half of the corresponding values for the largest Atlantic salmon (6·3 × 10 −3 kJ g −1 day −1 ) during winter. A minor reduction in protein content was found during winter, with mean reductions of 6–10% in comparison to those in September. During spring the fat content was replenished rapidly, particularly for the smallest salmon fry (a threefold increase from April to June). Fat content in the larger salmon and trout increased by about 1·8 times. Based on estimated metabolic rates, digested energy during wintertime may contribute about two‐thirds of the brown trout fry's energy demand. For Atlantic salmon, the corresponding value is about 50%. The winter period put considerable stress on the young salmonids living in lotic environments, in particular for the smallest fry with the lowest energy content before winter and the largest losses during winter. This should make the fry more vulnerable to adverse abiotic and biotic factors. |
format |
Article in Journal/Newspaper |
author |
Berg, O. K. Bremset, G. |
spellingShingle |
Berg, O. K. Bremset, G. Seasonal changes in the body composition of young riverine Atlantic salmon and brown trout |
author_facet |
Berg, O. K. Bremset, G. |
author_sort |
Berg, O. K. |
title |
Seasonal changes in the body composition of young riverine Atlantic salmon and brown trout |
title_short |
Seasonal changes in the body composition of young riverine Atlantic salmon and brown trout |
title_full |
Seasonal changes in the body composition of young riverine Atlantic salmon and brown trout |
title_fullStr |
Seasonal changes in the body composition of young riverine Atlantic salmon and brown trout |
title_full_unstemmed |
Seasonal changes in the body composition of young riverine Atlantic salmon and brown trout |
title_sort |
seasonal changes in the body composition of young riverine atlantic salmon and brown trout |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1998.tb00971.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1998.tb00971.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1998.tb00971.x |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Journal of Fish Biology volume 52, issue 6, page 1272-1288 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1998.tb00971.x |
container_title |
Journal of Fish Biology |
container_volume |
52 |
container_issue |
6 |
container_start_page |
1272 |
op_container_end_page |
1288 |
_version_ |
1802642259556958208 |