Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/23417
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Assessment of a land-locked Atlantic salmon (Salmo salar L.) population as a potential genetic resource with a focus on long-chain polyunsaturated fatty acid biosynthesis
Authors: Betancor, Monica
Olsen, Rolf E
Solstorm, David
Skulstad, Ole Fredrik
Tocher, Douglas R
Contact Email: m.b.betancor@stir.ac.uk
Keywords: omega-3 long chain polyunsaturated fatty acids
Atlantic salmon
land-locked
desaturases
elongases
Issue Date: Mar-2016
Publisher: Elsevier
Citation: Betancor M, Olsen RE, Solstorm D, Skulstad OF & Tocher DR (2016) Assessment of a land-locked Atlantic salmon (Salmo salar L.) population as a potential genetic resource with a focus on long-chain polyunsaturated fatty acid biosynthesis, Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism, 1861 (3), pp. 227-238.
Abstract: The natural food for Atlantic salmon (Salmo salar) in freshwater has relatively low levels of omega-3 (n-3) long-chain polyunsaturated fatty acids (LC-PUFA), whereas post-smolt salmon in seawater have a diet naturally rich in n-3 LC-PUFA. Land-locked salmon such as the Gullspång population feed exclusively on freshwater type lipids during its entire life cycle, a successful adaptation derived from divergent evolution. Studying land-locked populations may provide insights into the molecular and genetic control mechanisms that determine and regulate n-3 LC-PUFA biosynthesis and retention in Atlantic salmon. A two factorial study was performed comparing land-locked and farmed salmon parr fed diets formulated with fish or rapeseed oil for 8 weeks. The land-locked parr had higher capacity to synthesise n-3 LC-PUFA as indicated by higher expression and activity of desaturase and elongase enzymes. The data suggested that the land-locked salmon had reduced sensitivity to dietary fatty acid composition and that dietary docosahexaenoic acid (DHA) did not appear to suppress expression of LC-PUFA biosynthetic genes or activity of the biosynthesis pathway, probably an evolutionary adaptation to a natural diet lower in DHA. Increased biosynthetic activity did not translate to enhanced n-3 LC-PUFA contents in the flesh and diet was the only factor affecting this parameter. Additionally, high lipogenic and glycolytic potentials were found in land-locked salmon, together with decreased lipolysis which in turn could indicate increased use of carbohydrates as an energy source and a sparing of lipid.
Type: Journal Article
URI: http://hdl.handle.net/1893/23417
DOI Link: http://dx.doi.org/10.1016/j.bbalip.2015.12.015
Rights: This item has been embargoed for a period. During the embargo 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. Accepted refereed manuscript of: Betancor M, Olsen RE, Solstorm D, Skulstad OF & Tocher DR (2016) Assessment of a land-locked Atlantic salmon (Salmo salar L.) population as a potential genetic resource with a focus on long-chain polyunsaturated fatty acid biosynthesis, Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism, 1861 (3), pp. 227-238. DOI: 10.1016/j.bbalip.2015.12.015 © 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Affiliation: Aquaculture
Matre Aquaculture Research Station
Institute of Marine Research (IMR)
Matre Aquaculture Research Station
Aquaculture

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