Factors affecting marine production of Atlantic salmon ( Salmo salar)
This paper reviews recent advances in our understanding of factors influencing the marine production of wild Atlantic salmon (Salmo salar). Population abundance has declined during the last 30 years because of decreased marine growth rate, survival-rate, and production of multi-sea-winter fish. Mort...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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2004
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Online Access: | http://dx.doi.org/10.1139/f04-215 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-215 |
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crcansciencepubl:10.1139/f04-215 2024-06-23T07:51:18+00:00 Factors affecting marine production of Atlantic salmon ( Salmo salar) Jonsson, Bror Jonsson, Nina 2004 http://dx.doi.org/10.1139/f04-215 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-215 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 61, issue 12, page 2369-2383 ISSN 0706-652X 1205-7533 journal-article 2004 crcansciencepubl https://doi.org/10.1139/f04-215 2024-05-30T08:13:50Z This paper reviews recent advances in our understanding of factors influencing the marine production of wild Atlantic salmon (Salmo salar). Population abundance has declined during the last 30 years because of decreased marine growth rate, survival-rate, and production of multi-sea-winter fish. Mortality appears density-independent, indicating that the marine abundance is beneath the carrying capacity for the species. Correlations between the North Atlantic Oscillation winter index for the post-smolt year and production variables indicate that unfavourable climatic conditions are partly responsible for the decline. Low sea temperature may be the ultimate reason for the poor salmon production, whereas predation is one proximate mortality factor, which is probably both size and temperature dependent. Low growth rate during cold years was associated with low sea age at maturity and small salmon, contrary to the common observation that fast growth leads to young age at maturity. It is suggested that low water temperature may stimulate lipid storage relative to protein production and that the energy density needed to attain sexual maturity is lower in small than in large salmon. Future research should focus on the relationships between smolt age and (or) size and adult age and (or) size, and the association among water temperature, growth rate, growth efficiency, and age at sexual maturity. Article in Journal/Newspaper Atlantic salmon North Atlantic North Atlantic oscillation Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 61 12 2369 2383 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
This paper reviews recent advances in our understanding of factors influencing the marine production of wild Atlantic salmon (Salmo salar). Population abundance has declined during the last 30 years because of decreased marine growth rate, survival-rate, and production of multi-sea-winter fish. Mortality appears density-independent, indicating that the marine abundance is beneath the carrying capacity for the species. Correlations between the North Atlantic Oscillation winter index for the post-smolt year and production variables indicate that unfavourable climatic conditions are partly responsible for the decline. Low sea temperature may be the ultimate reason for the poor salmon production, whereas predation is one proximate mortality factor, which is probably both size and temperature dependent. Low growth rate during cold years was associated with low sea age at maturity and small salmon, contrary to the common observation that fast growth leads to young age at maturity. It is suggested that low water temperature may stimulate lipid storage relative to protein production and that the energy density needed to attain sexual maturity is lower in small than in large salmon. Future research should focus on the relationships between smolt age and (or) size and adult age and (or) size, and the association among water temperature, growth rate, growth efficiency, and age at sexual maturity. |
format |
Article in Journal/Newspaper |
author |
Jonsson, Bror Jonsson, Nina |
spellingShingle |
Jonsson, Bror Jonsson, Nina Factors affecting marine production of Atlantic salmon ( Salmo salar) |
author_facet |
Jonsson, Bror Jonsson, Nina |
author_sort |
Jonsson, Bror |
title |
Factors affecting marine production of Atlantic salmon ( Salmo salar) |
title_short |
Factors affecting marine production of Atlantic salmon ( Salmo salar) |
title_full |
Factors affecting marine production of Atlantic salmon ( Salmo salar) |
title_fullStr |
Factors affecting marine production of Atlantic salmon ( Salmo salar) |
title_full_unstemmed |
Factors affecting marine production of Atlantic salmon ( Salmo salar) |
title_sort |
factors affecting marine production of atlantic salmon ( salmo salar) |
publisher |
Canadian Science Publishing |
publishDate |
2004 |
url |
http://dx.doi.org/10.1139/f04-215 http://www.nrcresearchpress.com/doi/pdf/10.1139/f04-215 |
genre |
Atlantic salmon North Atlantic North Atlantic oscillation Salmo salar |
genre_facet |
Atlantic salmon North Atlantic North Atlantic oscillation Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 61, issue 12, page 2369-2383 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f04-215 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
61 |
container_issue |
12 |
container_start_page |
2369 |
op_container_end_page |
2383 |
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1802642359852204032 |