Can dietary lipid source circadian alternation improve omega-3 deposition in rainbow trout?

Brown, Thomas D., Francis, David S. and Turchini, Giovanni.M. 2010, Can dietary lipid source circadian alternation improve omega-3 deposition in rainbow trout?, Aquaculture, vol. 300, no. 1-4, pp. 148-155.

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Title Can dietary lipid source circadian alternation improve omega-3 deposition in rainbow trout?
Author(s) Brown, Thomas D.
Francis, David S.
Turchini, Giovanni.M.
Journal name Aquaculture
Volume number 300
Issue number 1-4
Start page 148
End page 155
Publisher Elsevier Scientific
Place of publication Amsterdam, The Netherlands
Publication date 2010-02-27
ISSN 0044-8486
1873-5622
Keyword(s) fish oil replacement
fatty acid deposition
omega-3
circadian patterns
aquaculture
canola oil
rapeseed oil
Summary With the salmonid industry currently exploiting the vast majority of globally available fish oil, there is the need to optimise fish oil utilisation by increasing its efficiency in terms of transferring the health-promoting long chain omega-3 fatty acids (n−3 LC-PUFA) into farmed fish flesh. The aim of this study was to evaluate if dietary fatty acid deposition is affected by the time of feeding, and hence identify possible innovative feeding strategies towardsmore efficient use of dietary fish oil. Over a period of 12 weeks, three diets with different lipid sources, canola oil (CO), fish oil (FO) or a 50/50 blend of the two oils (Mix), were alternated daily and fed to rainbow trout (Oncorhynchus mykiss). Six treatments were administered to fish, reference treatment (REF, continuously fed FO), control treatment (CT, continuously fed Mix), am canola oil ration (amCOR), pm canola oil ration (pmCOR), am canola oil satiation (amCOS) and pm canola oil satiation (pmCOS). Fish received either the CO diet in the am or pm feeds and received the FO diet at the opposite time. A significant increase in growth and feed consumption was noted in the pmCOS treatment. Fillet fatty acid profile was modified by associated feeding schedules and was generally reflective of dietary fatty acid profile. No significant increases in n−3 LCPUFA deposition were observed. However, both linoleic acid (18:2n−6) and α-linolenic acid (18:3n−3) contents were significantly higher in pmCOR compared to amCOR and CT. The results of the present study suggest the existence of cyclical circadian patterns in fatty acid deposition in rainbow trout.
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
HERDC collection year 2010
Copyright notice ©2010, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30029475

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