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    Echium oil is better than rapeseed oil in improving the response of barramundi to a disease challenge

    Access Status
    Fulltext not available
    Authors
    Alhazzaa, Ramez
    Bridle, A.
    Mori, T.
    Barden, A.
    Nichols, P.
    Carter, C.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Alhazzaa, R. and Bridle, A. and Mori, T. and Barden, A. and Nichols, P. and Carter, C. 2013. Echium oil is better than rapeseed oil in improving the response of barramundi to a disease challenge. Food Chemistry. 141 (2): pp. 1424-1432.
    Source Title
    Food Chemistry
    DOI
    10.1016/j.foodchem.2013.04.052
    ISSN
    0308-8146
    URI
    http://hdl.handle.net/20.500.11937/22999
    Collection
    • Curtin Research Publications
    Abstract

    Pathogen infection stimulates the fatty acid (FA) metabolism and the production of pro-inflammatory derivatives of FA. Barramundi, Lates calcarifer, was fed on a diet rich in preformed long-chain (=C20) polyunsaturated fatty acids (LC-PUFA) from fish oil (FO), to compare with diets containing high levels of C18 precursors for LC-PUFA - stearidonic (SDA) and ?-linolenic acid (GLA) - from Echium plantagineum (EO), or rapeseed oil (RO) rich in a-linolenic acid (ALA), but a poor source of LC-PUFA and their precursors. After 6 weeks, when growth rates were similar amongst the dietary treatments, a sub-lethal dose of Streptococcus iniae was administered to half of the fish, while the other half were maintained unchallenged and were pair-fed with the infected fish. Under a disease challenge situation, the tissue FA depots depleted at 3 days post-infection (DPI) and were then restored to their previous concentrations at 7 DPI. During the infection period, EO fish had a higher content of n3 and n6 PUFA in their tissues, higher n3:n6 PUFA ratio and reduced levels of the eicosanoids, TXB 2 and 6-keto-PGF1a, in their plasma compared with RO fish. Fish fed on FO and EO had a longer lasting and enduring response in their FA and eicosanoid concentrations, following a week of bacterial infection, compared with those fed on RO. EO, containing SDA and GLA and with a comparatively higher n3:n6 PUFA ratio, proved more effective than RO in compensating for immunity stress. © 2013 Elsevier Ltd.

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