The cost of anadromy: marine and freshwater mortality rates in anadromous Arctic char and brown trout in the Arctic region of Norway
It is hypothesized that in diadromous fish, migrations may occur because of differences in the availability of food in marine and freshwater habitats. The benefits of migration to sea may be increased growth opportunities and reproductive output, while the costs may be increased mortality and increa...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Canadian Science Publishing
2019
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Online Access: | http://dx.doi.org/10.1139/cjfas-2018-0428 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2018-0428 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2018-0428 |
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crcansciencepubl:10.1139/cjfas-2018-0428 2024-09-15T18:33:06+00:00 The cost of anadromy: marine and freshwater mortality rates in anadromous Arctic char and brown trout in the Arctic region of Norway Jensen, Arne Johan Finstad, Bengt Fiske, Peder 2019 http://dx.doi.org/10.1139/cjfas-2018-0428 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2018-0428 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2018-0428 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 76, issue 12, page 2408-2417 ISSN 0706-652X 1205-7533 journal-article 2019 crcansciencepubl https://doi.org/10.1139/cjfas-2018-0428 2024-08-01T04:10:00Z It is hypothesized that in diadromous fish, migrations may occur because of differences in the availability of food in marine and freshwater habitats. The benefits of migration to sea may be increased growth opportunities and reproductive output, while the costs may be increased mortality and increased energy use. Here we examine mortality rates of anadromous Arctic char (Salvelinus alpinus) and brown trout (Salmo trutta) in fresh water and at sea over a 25-year period to test these hypotheses. Daily mortality rates were 5–15 times higher at sea than in fresh water, with highest rates for first-time migrants, inferring a clear trade-off between increased mass gain and mortality risk during the sea migration. Descending smolts were caught in a trap at the outlet of the river, individually tagged, and thereafter recorded each time they passed through the trap on their annual migration between the river and the sea. Brown trout females seemed to benefit to a higher degree from migrating to sea than did female Arctic char, probably because of the higher growth rate at sea, and hence higher reproductive output. Article in Journal/Newspaper Salvelinus alpinus Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 76 12 2408 2417 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
It is hypothesized that in diadromous fish, migrations may occur because of differences in the availability of food in marine and freshwater habitats. The benefits of migration to sea may be increased growth opportunities and reproductive output, while the costs may be increased mortality and increased energy use. Here we examine mortality rates of anadromous Arctic char (Salvelinus alpinus) and brown trout (Salmo trutta) in fresh water and at sea over a 25-year period to test these hypotheses. Daily mortality rates were 5–15 times higher at sea than in fresh water, with highest rates for first-time migrants, inferring a clear trade-off between increased mass gain and mortality risk during the sea migration. Descending smolts were caught in a trap at the outlet of the river, individually tagged, and thereafter recorded each time they passed through the trap on their annual migration between the river and the sea. Brown trout females seemed to benefit to a higher degree from migrating to sea than did female Arctic char, probably because of the higher growth rate at sea, and hence higher reproductive output. |
format |
Article in Journal/Newspaper |
author |
Jensen, Arne Johan Finstad, Bengt Fiske, Peder |
spellingShingle |
Jensen, Arne Johan Finstad, Bengt Fiske, Peder The cost of anadromy: marine and freshwater mortality rates in anadromous Arctic char and brown trout in the Arctic region of Norway |
author_facet |
Jensen, Arne Johan Finstad, Bengt Fiske, Peder |
author_sort |
Jensen, Arne Johan |
title |
The cost of anadromy: marine and freshwater mortality rates in anadromous Arctic char and brown trout in the Arctic region of Norway |
title_short |
The cost of anadromy: marine and freshwater mortality rates in anadromous Arctic char and brown trout in the Arctic region of Norway |
title_full |
The cost of anadromy: marine and freshwater mortality rates in anadromous Arctic char and brown trout in the Arctic region of Norway |
title_fullStr |
The cost of anadromy: marine and freshwater mortality rates in anadromous Arctic char and brown trout in the Arctic region of Norway |
title_full_unstemmed |
The cost of anadromy: marine and freshwater mortality rates in anadromous Arctic char and brown trout in the Arctic region of Norway |
title_sort |
cost of anadromy: marine and freshwater mortality rates in anadromous arctic char and brown trout in the arctic region of norway |
publisher |
Canadian Science Publishing |
publishDate |
2019 |
url |
http://dx.doi.org/10.1139/cjfas-2018-0428 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2018-0428 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2018-0428 |
genre |
Salvelinus alpinus |
genre_facet |
Salvelinus alpinus |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 76, issue 12, page 2408-2417 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2018-0428 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
76 |
container_issue |
12 |
container_start_page |
2408 |
op_container_end_page |
2417 |
_version_ |
1810474847633932288 |