A n-3 PUFA depletion applied to rainbow trout fry (Oncorhynchus mykiss) does not modulate its subsequent lipid bioconversion capacity.
Br J Nutr
; 117(2): 187-199, 2017 01.
Article
em En
| MEDLINE
| ID: mdl-28112058
ABSTRACT
Nutritional strategies are currently developed to produce farmed fish rich in n-3 long-chain PUFA (LC-PUFA) whilst replacing fish oil by plant-derived oils in aquafeeds. The optimisation of such strategies requires a thorough understanding of fish lipid metabolism and its nutritional modulation. The present study evaluated the fatty acid bioconversion capacity of rainbow trout (Oncorhynchus mykiss) fry previously depleted in n-3 PUFA through a 60-d pre-experimental feeding period with a sunflower oil-based diet (SO) followed by a 36-d experimental period during which fish were fed either a linseed oil-based diet (LO) (this treatment being called SO/LO) or a fish oil-based diet (FO) (this treatment being called SO/FO). These treatments were compared with fish continuously fed on SO, LO or FO for 96 d. At the end of the 36-d experimental period, SO/LO and SO/FO fish recovered >80 % of the n-3 LC-PUFA reported for LO and FO fish, respectively. Fish fed on LO showed high apparent in vivo elongation and desaturation activities along the n-3 biosynthesis pathway. However, at the end of the experimental period, no impact of the fish n-3 PUFA depletion was observed on apparent in vivo elongation and desaturation activities of SO/LO fish as compared with LO fish. In contrast, the fish n-3 PUFA depletion negatively modulated the n-6 PUFA bioconversion capacity of fish in terms of reduced apparent in vivo elongation and desaturation activities. The effects were similar after 10 or 36 d of the experimental period, indicating the absence of short-term effects.
Palavras-chave
ALA α-linolenic acid; CD coefficient of distance; DGC daily growth coefficient; FE feed efficiency; FO fish oil-based diet; LA linoleic acid; LC-PUFA long-chain PUFA; LO linseed oil-based diet; SO sunflower oil-based diet; SO/FO SO until day 60 and then FO from days 6196; SO/LO SO until day 60 and then LO from days 6196; Fatty acid metabolism; Lipid bioconversion capacity; Plant-derived oils; Rainbow trout; Whole body fatty acid balance method
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Óleos de Plantas
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Óleo de Semente do Linho
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Ácidos Graxos Ômega-3
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Oncorhynchus mykiss
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Desnutrição
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Ácidos Graxos Ômega-6
/
Dieta
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article