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Effect of feeding Atlantic salmon(Salmo salar L.) a diet enriched with stearidonic acid from parr to smolt on growth and n-3 LC-PUFA biosynthesis

Effect of feeding Atlantic salmon(Salmo salar L.) a diet enr...

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The 14th International Symposium on Fish Nutrition & Feeding

作者： Basseer M.Codabaccus Andrew R.Bridle Peter D.Nichols Chris G.Carter NCMCRS AMCUniversity of TasmaniaBag 1370LauncestonTAS 7250 Australia CSIRO Food Futures Flagship Marine and Atmospheric ResearchGPO Box 1538HobartTAS 7001Australia Marine Research Laboratories Tasmanian Aquaculture and Fisheries InstituteUniversity of TasmaniaPrivate Bag 49HobartTAS 7001Australia

Vegetable oils(VO) have become the predominant substitute for fish oil(FO) in aquafeeds, however,the resultant lower concentrations of(n-3) long-chain(>C) polyunsaturated fatty acids [(n-3) LC-PUFA]in fish has put their use under *** need to investigate new oil sources *** research tested the hypothesis that in Atlantic salmon a high intake of stearidonic acid (SDA) from echium oil(EO) would result in increased(n-3) LC-PUFA biosynthesis and deposition due to lower competition for A6 *** were made to diets containing canola oil (CO) and FO for 112 d in freshwater followed by 84 d in seawater after *** diet resulted in a higher eicosapentaenoic acid(EPA) than CO diet in *** acid mass balance of freshwater fish indicated higher biosynthesis of eicosatetraenoic acid(ETA) and EPA in EO fish compared to fish on the other diets with a 2 fold increase in the biosynthesis of(n-3) LC-PUFA due to dietary *** seawater,biosynthetic activity was markedly reduced in all treatments,but there was higher biosynthesis of ETA in EO fish and appearance of all desaturation and elongation products along the(n-3) *** the biosynthetic precursors of(n-3) LC-PUFA,present in both CO and EO fish,no additional dietary(n-3) LC-PUFA were required for *** enriched plant oils might be a more suitable FO substitutes than conventional VO due to higher SDA content,higher total(n-3) and improved(n-3)/(n-6) ratio.

关键词： echium oil Stearidonic acid Atlantic salmon Biosynthesis Fatty acid

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