Endogenous biosynthesis of n-3 long-chain PUFA in Atlantic salmon

A more efficient utilisation of marine derived sources of dietary omega-3 long-chain polyunsaturated fatty acids (n-3 LC PUFA) in cultured Atlantic salmon (Salmo salar L.) could be enhanced by nutritional strategies that maximise endogenous n-3 LC PUFA synthesis. The objective of the present study w...

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Bibliographic Details
Main Authors: Tom Mock, David Francis, Matt Jago, BD Glencross, RP Smullen, GM Turchini
Format: Article in Journal/Newspaper
Language:unknown
Published: 2019
Subjects:
Animal production not elsewhere classified
Food sciences not elsewhere classified
Nutrition and dietetics not elsewhere classified
Aquaculture
Bioconversion
Fatty acids
Fish oil
Metabolism
n-3 Fatty acids
n-3 long-chain PUFA
3005 Fisheries sciences
Atlantic salmon
Salmo salar
Online Access:http://hdl.handle.net/10536/DRO/DU:30120750
https://figshare.com/articles/journal_contribution/Endogenous_biosynthesis_of_n-3_long-chain_PUFA_in_Atlantic_salmon/20764216
Description
Summary:A more efficient utilisation of marine derived sources of dietary omega-3 long-chain polyunsaturated fatty acids (n-3 LC PUFA) in cultured Atlantic salmon (Salmo salar L.) could be enhanced by nutritional strategies that maximise endogenous n-3 LC PUFA synthesis. The objective of the present study was to quantify the extent of n-3 LC PUFA biosynthesis and the resultant effect on fillet nutritional quality in large fish. Four diets were manufactured providing altered levels of dietary omega-3 substrate, namely 18:3n-3, and end-products, namely, 20:5n-3 and 22:6n-3. After 283 days of feeding, fish grew to in excess of 3000g and no differences in growth performance or biometrical parameters were recorded. An analysis of fatty acid composition and in vivo metabolism revealed that endogenous production of n-3 LC PUFA in fish fed a diet containing no added fish oil resulted in fillet levels of n-3 LC PUFA comparable to fish fed a diet with added fish oil. However, this result was not consistent among all treatments. Another major finding of this study was the presence of abundant dietary omega-3 substrate with the addition of dietary omega-3 end- product (i.e. fish oil) served to increase final fillet levels of n-3 LC PUFA. Specifically, preferential oxidation of dietary C18 n-3 PUFA resulted in conservation of n-3 LC PUFA from catabolism. Ultimately, this study highlights the potential for endogenous synthesis of n-3 LC PUFA to, partially, support a substantial reduction in the amount of dietary fish oil in diets for Atlantic salmon reared in seawater.

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