Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/466
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dc.contributor.authorPratoomyot, Jarunanen_UK
dc.contributor.authorBendiksen, Eldar Asgarden_UK
dc.contributor.authorBell, J Gordonen_UK
dc.contributor.authorTocher, Douglas Ren_UK
dc.date.accessioned2013-10-08T01:52:31Z-
dc.date.available2013-10-08T01:52:31Z-
dc.date.issued2008-08-01en_UK
dc.identifier.urihttp://hdl.handle.net/1893/466-
dc.description.abstractReplacement of fish oil with sustainable alternatives, such as vegetable oil, in aquaculture diets has to be achieved without compromising the nutritional quality, in terms of n-3 highly unsaturated fatty acid (HUFA) content, of the product. This may be possible if the level of replacement is not too high and oil blends are chosen carefully but, if high levels of fish oil are substituted, a fish oil finishing diet prior to harvest would be required to restore n-3HUFA. However, a decontaminated fish oil would be required to avoid increasing undesirable contaminants. Here we test the hypotheses that blending of rapeseed and soybean oils with southern hemisphere fish oil will have a low impact upon tissue n-3HUFA levels, and that decontamination of fish oil will have no major effect on the nutritional quality of fish oil as a feed ingredient for Atlantic salmon. Salmon (initial weight ~0.8 kg) were fed for 10 weeks with diets in which 60% of fish oil was replaced with blends of soybean, rapeseed and southern hemisphere fish oil (SVO) or 100% decontaminated northern fish oil (DFO) in comparison with a standard northern fish oil diet (FO). Decontamination of the oil was a two-step procedure that included treatment with activated carbon followed by thin film deodorisation. Growth performance and feed efficiency were unaffected by either the SVO or DFO diets despite these having lower gross nutrient and fatty acid digestibilities than the FO diet. There were also no effects on the gross composition of the fish. Liver and, to a lesser extent flesh, lipid levels were lower in fish fed the SVO blends, due to lower proportions of neutral lipids, specifically triacylglycerol. Tissue lipid levels were not affected in fish fed the DFO diet. Reflecting the diet, flesh eicosapentaenoic acid (EPA) and total n-3 fatty acids were higher, and 18:1n-9 lower, in fish fed DFO than FO, whereas there were no differences in liver fatty acid compositions. Flesh EPA levels were only slightly reduced from about 6% to 5% although docosahexaenoic acid (DHA) was reduced more severely from around 13% to about 7% in fish fed the SVO diets. In contrast, the liver fatty acid compositions showed higher levels of n-3 HUFA, with DHA only reduced from 21% to about 18% and EPA increased from under 8% to 9-10% in fish fed the SVO diets. The evidence suggested that increased liver EPA (and arachidonic acid) was not simply retention, but also conversion of dietary 18:3n-3 and 18:2n-6. Increased HUFA synthesis was supported by increased hepatic expression of fatty acyl desaturases in fish fed the SVO diets. Flesh n-3HUFA levels and desaturase expression was significantly higher in fish fed soybean oil than in fish fed rapeseed oil. In conclusion, partial replacement of fish oil with blends of vegetable oils and southern hemisphere fish oil had minimal impact on HUFA levels in liver, but a greater effect on flesh HUFA levels. Despite lower apparent digestibility, decontamination of fish oil did not significantly impact its nutritional quality for salmon.en_UK
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.relationPratoomyot J, Bendiksen EA, Bell JG & Tocher DR (2008) Comparison of effects of vegetable oils blended with southern hemisphere fish oil and decontaminated northern hemisphere fish oil on growth performance, composition and gene expression in Atlantic salmon (Salmo salar L.). Aquaculture, 280 (1-4), pp. 170-178. https://doi.org/10.1016/j.aquaculture.2008.04.028en_UK
dc.rightsPublished in Aquaculture by Elsevieren_UK
dc.subjectFsh oilen_UK
dc.subjectVegetable oilen_UK
dc.subjectDecontaminationen_UK
dc.subjectGrowth performanceen_UK
dc.subjectFatty acid compositionen_UK
dc.subjectContaminantsen_UK
dc.subjectAtlantic salmonen_UK
dc.subjectVegetable oilsen_UK
dc.subjectFishes Feeding and feedsen_UK
dc.subjectFishes Qualityen_UK
dc.subjectFishes Qualityen_UK
dc.subjectFishes Nutrition Requirmentsen_UK
dc.subjectAtlantic salmonen_UK
dc.titleComparison of effects of vegetable oils blended with southern hemisphere fish oil and decontaminated northern hemisphere fish oil on growth performance, composition and gene expression in Atlantic salmon (Salmo salar L.)en_UK
dc.typeJournal Articleen_UK
dc.identifier.doi10.1016/j.aquaculture.2008.04.028en_UK
dc.citation.jtitleAquacultureen_UK
dc.citation.issn0044-8486en_UK
dc.citation.volume280en_UK
dc.citation.issue1-4en_UK
dc.citation.spage170en_UK
dc.citation.epage178en_UK
dc.citation.publicationstatusPublisheden_UK
dc.citation.peerreviewedRefereeden_UK
dc.type.statusAM - Accepted Manuscripten_UK
dc.author.emaild.r.tocher@stir.ac.uken_UK
dc.contributor.affiliationUniversity of Stirlingen_UK
dc.contributor.affiliationBioMar ASen_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
dc.contributor.affiliationInstitute of Aquacultureen_UK
dc.identifier.isiWOS:000258965200026en_UK
dc.identifier.scopusid2-s2.0-47249123588en_UK
dc.identifier.wtid836790en_UK
dc.contributor.orcid0000-0002-8603-9410en_UK
dcterms.dateAccepted2008-08-01en_UK
dc.date.filedepositdate2008-10-08en_UK
rioxxterms.typeJournal Article/Reviewen_UK
rioxxterms.versionAMen_UK
local.rioxx.authorPratoomyot, Jarunan|en_UK
local.rioxx.authorBendiksen, Eldar Asgard|en_UK
local.rioxx.authorBell, J Gordon|en_UK
local.rioxx.authorTocher, Douglas R|0000-0002-8603-9410en_UK
local.rioxx.projectInternal Project|University of Stirling|https://isni.org/isni/0000000122484331en_UK
local.rioxx.freetoreaddate2008-10-08en_UK
local.rioxx.licencehttp://www.rioxx.net/licenses/all-rights-reserved|2008-10-08|en_UK
local.rioxx.filenamePratoomyot et al2008.pdfen_UK
local.rioxx.filecount1en_UK
local.rioxx.source0044-8486en_UK
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