Increasing dietary n-6 FA while keeping n-3 FA stable decreases EPA in polar lipids of farmed Atlantic salmon (Salmo salar)
There is an increased use of vegetable oils containing n-6 fatty acids (FA) in aquafeeds, and several trials indicate that there might be an increased requirement of EPA and DHA for Atlantic salmon when they are fed higher dietary n-6 FA. With a limited supply of EPA and DHA for production of aquafe...
Published in: | British Journal of Nutrition |
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Language: | English |
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Online Access: | https://hdl.handle.net/11250/2688504 https://doi.org/10.1017/S0007114520002494 |
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ftimr:oai:imr.brage.unit.no:11250/2688504 2023-05-15T15:31:04+02:00 Increasing dietary n-6 FA while keeping n-3 FA stable decreases EPA in polar lipids of farmed Atlantic salmon (Salmo salar) Hundal, Bjørg Kristine Liland, Nina Sylvia Rosenlund, Grethe Bou, Marta Stubhaug, Ingunn Sissener, Nini 2020 application/pdf https://hdl.handle.net/11250/2688504 https://doi.org/10.1017/S0007114520002494 eng eng Fiskeri- og havbruksnæringens forskningsfinansiering: 901282 Norges forskningsråd: 273215 British Journal of Nutrition. 2020, 1-16. urn:issn:0007-1145 https://hdl.handle.net/11250/2688504 https://doi.org/10.1017/S0007114520002494 cristin:1844814 1-16 British Journal of Nutrition Peer reviewed Journal article 2020 ftimr https://doi.org/10.1017/S0007114520002494 2021-09-23T20:16:16Z There is an increased use of vegetable oils containing n-6 fatty acids (FA) in aquafeeds, and several trials indicate that there might be an increased requirement of EPA and DHA for Atlantic salmon when they are fed higher dietary n-6 FA. With a limited supply of EPA and DHA for production of aquafeeds, it is important to know how to efficiently use these FA to maintain growth and health of the fish. In the present trial, three diets containing equal amounts of n-3 FA (about 7·7 % of total FA) and different n-6:n-3 FA ratios (about 1, 2 and 6), as well as one diet with n-6:n-3 FA ratio at about 1 but twice as much n-3 FA, were fed to Atlantic salmon. Despite constant dietary n-3, increasing dietary n-6 led to significantly reduced n-3 in tissue polar lipids. Interestingly, EPA was significantly reduced while DHA was not. Maintaining a stable n-3 content in the polar lipids when increasing dietary n-6 FA was only obtained by simultaneously increasing the dietary n-3 content and with this maintaining the same n-6:n-3 FA ratio. Polar lipid n-6 FA in tissues thus primarily reflected the dietary n-6:n-3 FA ratio and not the absolute dietary n-6 FA content. Neutral lipids, on the other hand, reflected the dietary absolute levels of both n-3 and n-6 FA. This study indicates that a better use of dietary EPA is achieved by keeping the dietary n-6:n-3 FA ratio low. publishedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR British Journal of Nutrition 125 1 10 25 |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
description |
There is an increased use of vegetable oils containing n-6 fatty acids (FA) in aquafeeds, and several trials indicate that there might be an increased requirement of EPA and DHA for Atlantic salmon when they are fed higher dietary n-6 FA. With a limited supply of EPA and DHA for production of aquafeeds, it is important to know how to efficiently use these FA to maintain growth and health of the fish. In the present trial, three diets containing equal amounts of n-3 FA (about 7·7 % of total FA) and different n-6:n-3 FA ratios (about 1, 2 and 6), as well as one diet with n-6:n-3 FA ratio at about 1 but twice as much n-3 FA, were fed to Atlantic salmon. Despite constant dietary n-3, increasing dietary n-6 led to significantly reduced n-3 in tissue polar lipids. Interestingly, EPA was significantly reduced while DHA was not. Maintaining a stable n-3 content in the polar lipids when increasing dietary n-6 FA was only obtained by simultaneously increasing the dietary n-3 content and with this maintaining the same n-6:n-3 FA ratio. Polar lipid n-6 FA in tissues thus primarily reflected the dietary n-6:n-3 FA ratio and not the absolute dietary n-6 FA content. Neutral lipids, on the other hand, reflected the dietary absolute levels of both n-3 and n-6 FA. This study indicates that a better use of dietary EPA is achieved by keeping the dietary n-6:n-3 FA ratio low. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Hundal, Bjørg Kristine Liland, Nina Sylvia Rosenlund, Grethe Bou, Marta Stubhaug, Ingunn Sissener, Nini |
spellingShingle |
Hundal, Bjørg Kristine Liland, Nina Sylvia Rosenlund, Grethe Bou, Marta Stubhaug, Ingunn Sissener, Nini Increasing dietary n-6 FA while keeping n-3 FA stable decreases EPA in polar lipids of farmed Atlantic salmon (Salmo salar) |
author_facet |
Hundal, Bjørg Kristine Liland, Nina Sylvia Rosenlund, Grethe Bou, Marta Stubhaug, Ingunn Sissener, Nini |
author_sort |
Hundal, Bjørg Kristine |
title |
Increasing dietary n-6 FA while keeping n-3 FA stable decreases EPA in polar lipids of farmed Atlantic salmon (Salmo salar) |
title_short |
Increasing dietary n-6 FA while keeping n-3 FA stable decreases EPA in polar lipids of farmed Atlantic salmon (Salmo salar) |
title_full |
Increasing dietary n-6 FA while keeping n-3 FA stable decreases EPA in polar lipids of farmed Atlantic salmon (Salmo salar) |
title_fullStr |
Increasing dietary n-6 FA while keeping n-3 FA stable decreases EPA in polar lipids of farmed Atlantic salmon (Salmo salar) |
title_full_unstemmed |
Increasing dietary n-6 FA while keeping n-3 FA stable decreases EPA in polar lipids of farmed Atlantic salmon (Salmo salar) |
title_sort |
increasing dietary n-6 fa while keeping n-3 fa stable decreases epa in polar lipids of farmed atlantic salmon (salmo salar) |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2688504 https://doi.org/10.1017/S0007114520002494 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
1-16 British Journal of Nutrition |
op_relation |
Fiskeri- og havbruksnæringens forskningsfinansiering: 901282 Norges forskningsråd: 273215 British Journal of Nutrition. 2020, 1-16. urn:issn:0007-1145 https://hdl.handle.net/11250/2688504 https://doi.org/10.1017/S0007114520002494 cristin:1844814 |
op_doi |
https://doi.org/10.1017/S0007114520002494 |
container_title |
British Journal of Nutrition |
container_volume |
125 |
container_issue |
1 |
container_start_page |
10 |
op_container_end_page |
25 |
_version_ |
1766361553226956800 |