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The 'n-3 LC-PUFA sparing effect' of modified dietary n-3 LC-PUFA content and DHA to EPA ratio in Atlantic salmon smolt

journal contribution
posted on 2023-05-17, 14:38 authored by Mohamed CodabaccusMohamed Codabaccus, Christopher CarterChristopher Carter, Andrew Bridle, Nichols, PD
n−3 Long-chain (≥C20) polyunsaturated fatty acids (LC-PUFA) are used extensively by fish via β-oxidation when in dietary surplus. Therefore it is of interest to optimize n−3 LC-PUFA deposition in fish via a reduction in β-oxidation which may be induced by manipulation of dietary fatty acids. This study tested whether Atlantic salmon smolt fed a dietwith a higher docosahexaenoic acid (DHA):eicosapentaenoic acid (EPA) ratio and a lower content of n−3 LC-PUFA to that of fish oil (FO) based diets would enhance deposition of n−3 LC-PUFA in fish tissues. Comparisons were made between fish fed: a FO diet, a blend of 50% rapeseed and 50% tuna oil diet (model oil, MO 1), a blend of 50% rapeseed, 25% tuna and 25% FO diet (MO 2), and a blend of 50% FO and 50% chicken fat diet (FO/CF). The dietary DHA:EPA ratio was in the order MO 1>MO 2>FO/CF~FO. Dietary n−3 LC-PUFA content was approximately 2-fold lower in fish fed the MO 1, MO 2 and FO/CF diets compared to the FO diet. There were comparable amounts of n−3 LC-PUFA in the muscle of FO,MO1 and FO/CF fed fish. Our findings indicate that the right balance in both absolute and relative amounts of EPA and DHA can promote n−3 LC-PUFA retention.


Publication title









Institute for Marine and Antarctic Studies


Elsevier Science Bv

Place of publication

Po Box 211, Amsterdam, Netherlands, 1000 Ae

Rights statement

Copyright 2012 Elsevier B.V.

Repository Status

  • Restricted

Socio-economic Objectives

Aquaculture fin fish (excl. tuna)

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