Echium oil provides no benefit over linseed oil for (n-3) long-chain PUFA biosynthesis in rainbow trout

Cleveland, Benjamin J., Francis, David S. and Turchini, Giovanni M. 2012, Echium oil provides no benefit over linseed oil for (n-3) long-chain PUFA biosynthesis in rainbow trout, Journal of nutrition, vol. 142, no. 8, pp. 1449-1455.

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Title Echium oil provides no benefit over linseed oil for (n-3) long-chain PUFA biosynthesis in rainbow trout
Author(s) Cleveland, Benjamin J.
Francis, David S.ORCID iD for Francis, David S.
Turchini, Giovanni M.ORCID iD for Turchini, Giovanni M.
Journal name Journal of nutrition
Volume number 142
Issue number 8
Start page 1449
End page 1455
Total pages 7
Publisher American Society for Nutrition
Place of publication Bethesda, Md.
Publication date 2012-08-01
ISSN 0022-3166
Keyword(s) animal experiment
controlled study
dietary intake
enzyme activity
enzyme substrate
fatty acid desaturation
growth rate
lipid composition
nutrient availability
rainbow trout
Summary The implementation of alternative lipid sources for use in aquaculture is of considerable interest globally. However, the possible benefit of using stearidonic acid (SDA)–rich fish oil (FO) alternatives has led to scientific confusion. Two hundred and forty rainbow trout (Oncorhynchus mykiss) were fed 1 of 4 diets (3 replicate tanks/treatment) containing either FO, linseed oil (LO), echium oil, or mixed vegetable oil (72% LO, 23% sunflower oil, and 6% canola oil) as the dietary lipid source (16.5%) for 73 d to investigate the competition and long-chain PUFA (LC-PUFA) biosynthesis between the fatty acid substrates α-linolenic acid (ALA) and SDA. SDA was more efficiently bioconverted to LC-PUFA compared with ALA. However, when the dietary lipid sources were directly compared, the increased provision of C18 PUFA within the LO diet resulted in no significant differences in (n-3) LC-PUFA content compared with fish fed the other diets. This study therefore shows that, rather than the previously speculated substrate competition, the limiting process in the apparent in vivo (n-3) LC-PUFA biosynthesis appears to be substrate availability. Rainbow trout fed the SDA- and ALA-rich dietary lipid sources subsequently had similar significant reductions in (n-3) LC-PUFA compared with fish fed the FO diet, therefore providing no additional dietary benefit on (n-3) LC-PUFA concentrations.
Language eng
Field of Research 070401 Aquaculture
Socio Economic Objective 830102 Aquaculture Fin Fish (excl. Tuna)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, American Society for Nutrition
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Document type: Journal Article
Collection: School of Life and Environmental Sciences
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