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<p>While the substitution of plant oils has been widely studied in controlled environments, few trials have assessed their impact in large-scale real-world settings. This study evaluated the effects of replacing rapeseed oil with linseed oil, rich in alpha-linolenic acid (ALA), on growth performance, plasma biomarkers, and fatty acid composition in Atlantic salmon (<i>Salmo salar</i>) during the grow-out phase under commercial farming conditions. Fish (Control: 1027 ± 15&#xa0;g; Low linseed oil: 1034 ± 154&#xa0;g; High linseed oil: 977 ± 43&#xa0;g) were fed diets containing 0%, 6.7%, or 13.4% linseed oil, all formulated to cover 6% eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) of total fatty acids. Fish were fed experimental diets for 25&#xa0;weeks, with a start sampling in Week 0, followed by samplings in Week 15 and Week 25. Growth, mortality, fillet pigmentation, and plasma biochemistry were not significantly affected by linseed oil inclusion, confirming its suitability as a sustainable lipid source. Tissue fatty acid profiles reflected dietary ALA increases as well as increases in intermediate metabolites, especially eicosatetraenoic acid (ETA). However, no significant rise in EPA or DHA levels was observed, suggesting limited biosynthesis under commercial conditions. These findings validate the robustness of Atlantic salmon physiology and support the practical use of linseed oil in aquafeeds, provided essential long-chain polyunsaturated fatty acids (LC-PUFA) requirements are met.</p>

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Effects of dietary inclusion of low and high doses of linseed oil on fatty acid composition, growth, and blood biochemistry in commercially farmed Atlantic salmon post-smolt

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Frederike Keitel-Gröner,
  • Ingunn Stubhaug,
  • Eirik Hoel,
  • David Knudsen,
  • Kjetil Berge

摘要

While the substitution of plant oils has been widely studied in controlled environments, few trials have assessed their impact in large-scale real-world settings. This study evaluated the effects of replacing rapeseed oil with linseed oil, rich in alpha-linolenic acid (ALA), on growth performance, plasma biomarkers, and fatty acid composition in Atlantic salmon (Salmo salar) during the grow-out phase under commercial farming conditions. Fish (Control: 1027 ± 15 g; Low linseed oil: 1034 ± 154 g; High linseed oil: 977 ± 43 g) were fed diets containing 0%, 6.7%, or 13.4% linseed oil, all formulated to cover 6% eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) of total fatty acids. Fish were fed experimental diets for 25 weeks, with a start sampling in Week 0, followed by samplings in Week 15 and Week 25. Growth, mortality, fillet pigmentation, and plasma biochemistry were not significantly affected by linseed oil inclusion, confirming its suitability as a sustainable lipid source. Tissue fatty acid profiles reflected dietary ALA increases as well as increases in intermediate metabolites, especially eicosatetraenoic acid (ETA). However, no significant rise in EPA or DHA levels was observed, suggesting limited biosynthesis under commercial conditions. These findings validate the robustness of Atlantic salmon physiology and support the practical use of linseed oil in aquafeeds, provided essential long-chain polyunsaturated fatty acids (LC-PUFA) requirements are met.