Document Detail

Fatty acid metabolism (desaturation, elongation and beta-oxidation) in rainbow trout fed fish oil- or linseed oil-based diets.
MedLine Citation:
PMID:  19123959     Owner:  NLM     Status:  MEDLINE    
In consideration of economical and environmental concerns, fish oil (FO) substitution in aquaculture is the focus of many fish nutritionists. The most stringent drawback of FO replacement in aquafeeds is the consequential modification to the final fatty acid (FA) make-up of the fish fillet. However, it is envisaged that a solution may be achieved through a better understanding of fish FA metabolism. Therefore, the present study investigated the fate of individual dietary FA in rainbow trout (Oncorhynchus mykiss) fed a FO-based diet (rich in 20 : 5n-3) or a linseed oil-based diet (LO; rich in 18 : 3n-3). The study demonstrated that much of the 18 : 3n-3 content from the LO diet was oxidised and, despite the significantly increased accretion of Delta-6 and Delta-5 desaturated FA, a 2- and 3-fold reduction in the fish body content of 20 : 5n-3 and 22 : 6n-3, respectively, compared with the FO-fed fish, was recorded. The accretion of longer-chain FA was unaffected by the dietary treatments, while there was a greater net disappearance of FA provided in dietary surplus. SFA and MUFA recorded a net accretion of FA produced ex novo. In the fish fed the FO diet, the majority of dietary 20 : 5n-3 was accumulated (53.8 %), some was oxidised (14.7 %) and a large proportion (31.6 %) was elongated and desaturated up to 22 : 6n-3. In the fish fed the LO diet, the majority of dietary 18 : 3n-3 was accumulated (58.1 %), a large proportion was oxidised (29.5 %) and a limited amount (12.4 %) was bio-converted to longer and more unsaturated homologues.
Giovanni M Turchini; David S Francis
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-01-05
Journal Detail:
Title:  The British journal of nutrition     Volume:  102     ISSN:  1475-2662     ISO Abbreviation:  Br. J. Nutr.     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-07-06     Completed Date:  2009-08-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372547     Medline TA:  Br J Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  69-81     Citation Subset:  IM    
School of Life & Environmental Sciences, Deakin University, PO Box 423, Warrnambool, VIC, Australia.
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MeSH Terms
Animal Feed*
Body Weight
Fatty Acids, Omega-3 / analysis,  metabolism*
Fish Oils / administration & dosage*
Linseed Oil / administration & dosage*
Oncorhynchus mykiss / growth & development,  metabolism*
Reg. No./Substance:
0/Fatty Acids, Omega-3; 0/Fish Oils; 8001-26-1/Linseed Oil

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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