Effect of diets enriched in Delta6 desaturated fatty acids (18:3n-6 and 18:4n-3), on growth, fatty acid composition and highly unsaturated fatty acid synthesis in two populations of Arctic charr (Salvelinus alpinus L.)

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
Douglas R TocherJ Gordon Bell

Abstract

This study aimed to test the hypothesis that diets containing relatively high amounts of the Delta6 desaturated fatty acids stearidonic acid (STA, 18:4n-3) and gamma-linolenic acid (GLA, 18:3n-6), may be beneficial in salmonid culture. The rationale being that STA and GLA would be better substrates for highly unsaturated fatty acid (HUFA) synthesis as their conversion does not require the activity of the reputed rate-limiting enzyme, fatty acid Delta6 desaturase. Duplicate groups of two Arctic charr (Salvelinus alpinus L.) populations with different feeding habits, that had been reported previously to show differences in HUFA biosynthetic capacity, were fed for 16 weeks on two fish meal based diets containing 47% protein and 21% lipid differing only in the added lipid component, which was either fish oil (FO) or echium oil (EO). Dietary EO had no detrimental effect on growth performance and feed efficiency, mortalities, or liver and flesh lipid contents in either population. The proportions of 18:2n-6, 18:3n-3, 18:3n-6, 18:4n-3, 20:3n-6 and 20:4n-3 in total lipid in both liver and flesh were increased by dietary EO in both populations. However, the percentages of 20:5n-3 and 22:6n-3 were reduced by EO in both liver and flesh in...Continue Reading

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Citations

Dec 18, 2008·Nutrition Research Reviews·Matthew R MillerChris G Carter
Sep 29, 2009·Plant Physiology·Tom E Clemente, Edgar B Cahoon
Nov 1, 2012·Lipids in Health and Disease·Claudia StrobelKatrin Kuhnt
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Mar 15, 2016·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Stefan de GelderMarc H G Berntssen
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Jan 13, 2010·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Mercedes Díaz-LópezCovadonga Rodríguez

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