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Fish Physiology and Biochemistry

, Volume 39, Issue 6, pp 1631–1640 | Cite as

Dietary fish oil replacement with palm or poultry oil increases fillet oxidative stability and decreases liver glutathione peroxidase activity in barramundi (Lates calcarifer)

  • Wan A. R. Wan Ahmad
  • David A. J. Stone
  • Kathryn A. Schuller
Article

Abstract

Complete dietary fish oil replacement with palm or poultry oil in barramundi (Lates calcarifer) had no detrimental effects on growth or hepatosomatic index of juvenile fish up to an average size of ~50 g. However, it significantly decreased the omega-3 (n-3) long-chain polyunsaturated fatty acid content of the fish muscle (fillet) lipids. This was particularly true for eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) which are recognised for their health beneficial effects in the human diet. As a result of their decreased EPA and DHA content, the peroxidation index of the muscle lipids was also decreased. This was associated with increased simulated retail storage shelf life as indicated by decreased thiobarbituric acid reactive substances in muscle samples from fish fed the palm or poultry oil-based diets. Concomitantly, glutathione peroxidase (GPx) activity, but not glutathione S-transferase (GST) activity or reduced glutathione concentration, was significantly reduced in the liver of barramundi fed the palm or poultry oil-based diets as compared with the fish fed the fish oil-based diet. Furthermore, GPx and GST activity were very low in muscle, much lower than in gastrointestinal tract, liver or swim bladder. Therefore, we propose that liver GPx activity may be a good predictor of fillet shelf life in barramundi and other fish species.

Keywords

Fish oil replacement Palm oil Glutathione peroxidase Thiobarbituric reactive substances Lipid peroxidation 

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Wan A. R. Wan Ahmad
    • 1
  • David A. J. Stone
    • 1
    • 2
  • Kathryn A. Schuller
    • 1
  1. 1.School of Biological SciencesFlinders UniversityAdelaideAustralia
  2. 2.Aquatic SciencesSouth Australian Research and Development InstituteAdelaideAustralia

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