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Fatty acid metabolism in European sea bass (Dicentrarchus labrax): effects of n-6 PUFA and MUFA in fish oil replaced diets

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Abstract

Monounsaturated fatty acids (MUFA)-rich and n-6 polyunsaturated fatty acid (n-6 PUFA)-rich vegetable oils are increasingly used as fish oil replacers for aquafeed formulation. The present study investigated the fatty acid metabolism in juvenile European sea bass (Dicentrarchus labrax, 38.4 g) fed diets containing fish oil (FO, as the control treatment) or two different vegetable oils (the MUFA-rich canola/rapeseed oil, CO; and the n-6 PUFA-rich cottonseed oil, CSO) tested individually or as a 50/50 blend (CO/CSO). The whole-body fatty acid balance method was used to deduce the apparent in vivo fatty acid metabolism. No effect on growth performance and feed utilization was recorded. However, it should be noted that the fish meal content of the experimental diets was relatively high, and thus the requirement for n-3 long-chain polyunsaturated fatty acid (n-3 LC-PUFA) may have likely been fulfilled even if dietary fish oil was fully replaced by vegetable oils. Overall, relatively little apparent in vivo fatty acid bioconversion was recorded, whilst the apparent in vivo β-oxidation of dietary fatty acid was largely affected by the dietary lipid source, with higher rate of β-oxidation for those fatty acids which were provided in dietary surplus. The deposition of 20:5n-3 and 22:6n-3, as % of the dietary intake, was greatest for the fish fed on the CSO diet. It has been shown that European sea bass seems to be able to efficiently use n-6 PUFA for energy substrate, and this may help in minimizing the β-oxidation of the health benefiting n-3 LC-PUFA and thus increase their deposition into fish tissues.

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Acknowledgments

This study was supported by The Scientific & Technological Research Council of Turkey (TÜBİTAK) (project 106O195) and part of a PhD thesis of A.H.Y. who was granted by the Research Fund (SUF2011D1) of University of Çukurova. The authors also express their acknowledgments to Dr. Oğuz Taşbozan for his support in formulation of the diets.

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Authors and Affiliations

  1. Department of Aquaculture, Faculty of Fisheries, Çukurova University, 01330, Adana, Turkey

    Tufan O. Eroldoğan, Asuman H. Yılmaz & Pınar Mumoğullarında

  2. School of Life and Environmental Sciences, Deakin University, P.O. Box 423, Warrnambool, VIC, 3280, Australia

    Giovanni M. Turchini

  3. Department of Aquaculture, Faculty of Fisheries, Atatürk University, Erzurum, Turkey

    Murat Arslan

  4. Department of Agricultural Biotechnology, Faculty of Agriculture, Atatürk University, Erzurum, Turkey

    Necdet A. Sirkecioğlu

  5. Department of Aquaculture, Faculty of Fisheries, Mersin University, Yenişehir Campus, Mersin, Turkey

    Kenan Engin

  6. Feke Vocational School, Çukurova University, Adana, Turkey

    Ilgin Özşahinoğlu

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  1. Tufan O. Eroldoğan
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  2. Asuman H. Yılmaz
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  8. Pınar Mumoğullarında
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Correspondence to Tufan O. Eroldoğan.

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Eroldoğan, T.O., Yılmaz, A.H., Turchini, G.M. et al. Fatty acid metabolism in European sea bass (Dicentrarchus labrax): effects of n-6 PUFA and MUFA in fish oil replaced diets. Fish Physiol Biochem 39, 941–955 (2013). https://doi.org/10.1007/s10695-012-9753-7

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  • DOI: https://doi.org/10.1007/s10695-012-9753-7

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