Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/2930

Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Altered fatty acid compositions in Atlantic salmon (Salmo salar) fed diets containing linseed and rapeseed oils can be partially restored by a subsequent fish oil finishing diet
Authors: Bell, J Gordon
Tocher, Douglas R
Henderson, R James
Dick, James R
Crampton, Viv
Contact Email: drt1@stir.ac.uk
Keywords: Atlantic salmon
Salmo salar
Fish oil
Vegetable oil
Linseed oil
Rapeseed oil
Mixture design
Growth rate
Flesh
Lipid and fatty acid composition
Finishing diet
Issue Date: Sep-2003
Publisher: American Society for Nutritional Sciences
Citation: Bell JG, Tocher DR, Henderson RJ, Dick JR & Crampton V (2003) Altered fatty acid compositions in Atlantic salmon (Salmo salar) fed diets containing linseed and rapeseed oils can be partially restored by a subsequent fish oil finishing diet, Journal of Nutrition, 133 (9), pp. 2793-2801.
Abstract: Atlantic salmon post-smolts were fed ten experimental diets containing various blends of two vegetable oils, linseed (LO) and rapeseed oil (RO), and fish oil (FO) in a triangular trial design, for 50 weeks. After sampling, fish previously fed 100% FO, LO and RO were switched to a diet containing 100% FO and grown on for a further 20 weeks. Fatty acid compositions of flesh total lipid were linearly correlated with dietary fatty acid compositions (r = 0.99-1.00, P < 0.0001). Inclusion of vegetable oil at 33% of total oil resulted in a reduction in the concentrations of the highly unsaturated fatty acids, eicosapentaenoate [20:5(n-3)] and docosahexaenoate [22:6(n-3)], to around 70 and 75%, respectively, of the values in fish fed 100% FO. When vegetable oil was included at 100% of total dietary lipid the concentrations of 20:5(n-3) and 22:6(n-3) were reduced to around 30% and 36%, respectively, of the values in fish fed FO. Transfer of fish previously fed 100% vegetable oil to a 100% FO diet for 20 weeks, restored the concentrations of 20:5(n-3) and 22:6(n-3) to around 80% of the value in fish fed 100% FO for 70 weeks. However, concentrations of 18:2(n-6) remained about 1.5-fold higher, compared to fish fed 100% FO, in fish previously fed either 100% LO or RO. This study suggests that RO and LO can be used successfully to culture salmon through the seawater phase of their growth cycle although this will result in reductions in flesh 20:5(n-3) and 22:6(n-3) concentrations that can be partially restored by resuming a diet containing only marine FO for a period prior to harvest.
Type: Journal Article
URI: http://hdl.handle.net/1893/2930
URL: http://jn.nutrition.org/content/133/9/2793.abstract
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author; you can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Aquaculture
Aquaculture
University of Stirling
Aquaculture
EWOS Innovation

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