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Whole-body in vivo enzyme activity of fatty acid metabolism in barramundi,Lates calcarifer

Whole-body in vivo enzyme activity of fatty acid metabolism ...

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The 14th International Symposium on Fish Nutrition & Feeding

作者： Ramez Alhazzaa Andrew Bridle Peter Nichols Chris Carter ncmcrs University of TasmaniaLocked Bag 1370LauncestonTAS 7250Australia TAFI University of TasmaniaPrivate Bag 49HobartTAS 7001Australia Food Futures Flagship CSIRO Marine & Atmospheric ResearchCastray EsplanadeHobartTAS 7000Australia

Fish oil(FO) supply is strongly dependent on the availability and sustainability of wild fisheries and is under pressure from increasing demand of the expanding agricultural and pharmaceutical *** plant oils are rich in polyunsaturated fatty acids(PUFA) and emerging as practical replacements for *** fish on different precursors ofω3 long chain (≥C) PUFA(LC-PUFA) to increase LC-PUFA content in flesh is of potential interest in *** test the preferential utilisation of dietary fatty acids and capacity of barramundi to synthesise LC-PUFA from shorter(C) precursors,three identical diets differing only in lipid source were fed to juvenile fish raised in freshwater and seawater for 8 *** from Echium plantagineum(EO),rich in SDA(18:4ω3),and from canola(CO),containing ALA(18:3ω3),were compared with a FO diet rich in EPA+DHA(20:5ω3 &(22:6ω3),.FA mass balance showed no significant effects for varied salinity on FA *** enzymes involved in FA biosynthesis varied in apparent in vivo activity depending on dietary ***-fed fish,containing SDA to bypass the rate-limiting△-6 FA desaturase(FAD6) step within PUFA synthesis pathway,did not show activity for this enzyme,while CO inclusion in diets increased FAD6 and to a less extent when feeding on *** activity was shown by the downstream△5 FA desaturase(FAD5) enzyme needed to synthesise de novoω-3 LC-PUFA products in EO-fed fish compared to FO and ***-fed fish accumulated oleic acid and showed significantly higher apparent activity for△9 FA desaturase(FAD9) compared with the EO and CO ***β-oxidation of total dietary and de novo fatty acids recorded the greatest rates in fish fed on FO compared with plant *** prefer to accumulate most of the dietary SFA,MUFA and utilise PUFA by elongation and desaturation to the more beneficial *** biosynthesis did not produce excess amounts of the final products and catabolised LC-PUFA preferentially from

关键词： Lates calcarifer lipid metabolism fatty acid mass balance

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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...

引用

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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