Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/29939
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Endogenous production of n-3 long-chain PUFA from first feeding and the influence of dietary linoleic acid and the α-linolenic:linoleic ratio in Atlantic salmon (Salmo salar)
Author(s): Sprague, Matthew
Xu, Gong
Betancor, Monica B
Olsen, Rolf Erik
Torrissen, Ole
Glencross, Brett D
Tocher, Douglas R
Contact Email: m.b.betancor@stir.ac.uk
Keywords: Arachidonic acid
Biosynthesis
Desaturation
Docosahexaenoic acid
Eicosapentaenoic acid
Elongation Running title
Issue Date: 28-Nov-2019
Citation: Sprague M, Xu G, Betancor MB, Olsen RE, Torrissen O, Glencross BD & Tocher DR (2019) Endogenous production of n-3 long-chain PUFA from first feeding and the influence of dietary linoleic acid and the α-linolenic:linoleic ratio in Atlantic salmon (Salmo salar). British Journal of Nutrition, 122 (10), pp. 1090-1102. https://doi.org/10.1017/S0007114519001946
Abstract: Atlantic salmon (Salmo salar) possess enzymes required for the endogenous biosynthesis of n-3 long-chain polyunsaturated fatty acids (LC-PUFA), eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), from a-linolenic acid (ALA). Linoleic acid (LA) competes with ALA for LC-PUFA biosynthesis enzymes leading to the production of n-6 LC-PUFA, including arachidonic acid (ARA). We aimed to quantify the endogenous production of EPA and DHA from ALA in salmon fed from first feeding on diets that contain no EPA and DHA, and to determine the influence of dietary LA and ALA:LA ratio on LC-PUFA production. Salmon were fed from first feeding for 22 weeks with three diets formulated with linseed and sunflower oils to provide ALA:LA ratios of approximately 3:1, 1:1 and 1:3. Endogenous production of n-3 LC-PUFA was 5.9, 4.4 and 2.8 mg per g fish and that of n-6 LC-PUFA was 0.2, 0.5 and 1.4 mg per g of fish in salmon fed diets with ALA:LA ratios of 3:1, 1:1 and 1:3, respectively. The ratio of n-3:n-6 LC-PUFA production decreased from 27.4 to 2.0, and DHA:EPA ratio increased and EPA:ARA and DHA:ARA ratios decreased, as dietary ALA:LA ratio decreased. In conclusion, with a dietary ALA:LA ratio of 1, salmon fry/parr produced around 28 μg n-3 LC-PUFA per g of fish per day, with a DHA:EPA ratio of 3.4. Production of n-3 LC-PUFA exceeded that of n-6 LC-PUFA by almost 9-fold. Reducing the dietary ALA:LA ratio reduced n-3 LC-PUFA production, and EPA:ARA and DHA:ARA ratios, and increased n-6 LC-PUFA production, and DHA:EPA ratio.
DOI Link: 10.1017/S0007114519001946
Rights: This article has been published in a revised form in British Journal of Nutrition http://doi.org/10.1017/S0007114519001946. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. © The Authors 2019.

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