File(s) under permanent embargo
Can dietary lipid source circadian alternation improve omega-3 deposition in rainbow trout?
journal contribution
posted on 2010-02-27, 00:00 authored by Thomas Brown, David FrancisDavid Francis, Giovanni TurchiniGiovanni TurchiniWith 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.
History
Journal
AquacultureVolume
300Issue
1-4Pagination
148 - 155Publisher
Elsevier ScientificLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0044-8486eISSN
1873-5622Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2010, Elsevier B.V.Usage metrics
Categories
Keywords
fish oil replacementfatty acid depositionomega-3circadian patternsaquaculturecanola oilrapeseed oilScience & TechnologyLife Sciences & BiomedicineFisheriesMarine & Freshwater BiologyFATTY-ACID-COMPOSITIONMIXED FEEDING SCHEDULESSALMO-SALAR L.MACCULLOCHELLA-PEELII-PEELIIFISH-OILMURRAY CODVEGETABLE-OILGROWTH-PERFORMANCENILE TILAPIAOREOCHROMIS-NILOTICUSZoology
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC