|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|
Olsen, Rolf E
Skulstad, Ole Fredrik
Tocher, Douglas R
|Keywords:||omega-3 long chain polyunsaturated fatty acids|
|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.|
|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/|
|Betancor et al 2016 BBA.pdf||1.05 MB||Adobe PDF||Under Embargo until 1/3/2017 Request a copy|
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