Short-term food deprivation before a fish oil finishing strategy improves the deposition of n-3 LC-PUFA, but not the washing-out of C18 PUFA in rainbow trout

Thanuthong, T., Francis, D. S., Senadheera, S. P. S. D., Jones, P. L. and Turchini, G. M. 2012, Short-term food deprivation before a fish oil finishing strategy improves the deposition of n-3 LC-PUFA, but not the washing-out of C18 PUFA in rainbow trout, Aquaculture nutrition, vol. 18, no. 4, pp. 441-456.

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Title Short-term food deprivation before a fish oil finishing strategy improves the deposition of n-3 LC-PUFA, but not the washing-out of C18 PUFA in rainbow trout
Formatted title Short-term food deprivation before a fish oil finishing strategy improves the deposition of n-3 LC-PUFA, but not the washing-out of C18 PUFA in rainbow trout
Author(s) Thanuthong, T.
Francis, D. S.
Senadheera, S. P. S. D.
Jones, P. L.
Turchini, G. M.
Journal name Aquaculture nutrition
Volume number 18
Issue number 4
Start page 441
End page 456
Total pages 16
Publisher Wiley - Blackwell Publishing Ltd
Place of publication Oxford, England
Publication date 2012-08
ISSN 1353-5773
1365-2095
Keyword(s) aquaculture
dietary change
feed management
finishing
fish oil replacement
wash-out
Summary This study aimed to test the hypothesis that the efficiency of a finishing period can be improved by reducing the initial fat content of fish fillets, by means of a period of food deprivation. Two groups of rainbow trout (Oncorhynchus mykiss) were fed for an 18-week grow-out period on a vegetable oil-based diet (VO) or a fish oil-based diet (FO). VO fed fish were then split into two sub groups: one (VO/FO) was shifted to the FO diet for 8 weeks, whilst the other (UF/FO) was deprived of food (unfed) for 2 weeks and then fed the FO diet for the remaining 6 weeks. The control treatment (FO/FO) was represented by fish continuously fed FO. The subsequent reduction of total fat in the UF/FO treatment was then responsible for a much faster recovery towards a FO-like fatty acid profile, validating the proposed hypothesis. However, the modification of the fatty acid composition of fish fillets during the feed withholding period, coupled with the postponement of the finishing diet, resulted in only minor beneficial effects of this strategy, and the loss of potential weight gain. However, the n-3 LC-PUFA content in UF/VO fish fillets was significantly higher than fish subjected to the VO/FO treatment.
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, Blackwell Publishing Ltd
Persistent URL http://hdl.handle.net/10536/DRO/DU:30046959

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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