Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/2798

Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Effects of dietary polyunsaturated fatty acid/vitamin E (PUFA/tocopherol) ratio on antioxidant defence mechanisms of juvenile gilthead sea bream (Sparus aurata L., Osteichthyes, Sparidae)
Authors: Mourente, Gabriel
Diaz, Esther
Tocher, Douglas R
Bell, J Gordon
Contact Email: drt1@stir.ac.uk
Keywords: Gilthead seabream
Sparus aurata
Fish oil
Oxidised oil
Polyunsaturated fatty acids
Vitamin E
Alpha-tocopherol
PUFA/Vitamin E Ratio
Lipid peroxidation
Antioxidant defence enzymes
MDA
Isoprostanes
Issue Date: Nov-2000
Publisher: Springer
Citation: Mourente G, Diaz E, Tocher DR & Bell JG (2000) Effects of dietary polyunsaturated fatty acid/vitamin E (PUFA/tocopherol) ratio on antioxidant defence mechanisms of juvenile gilthead sea bream (Sparus aurata L., Osteichthyes, Sparidae), Fish Physiology and Biochemistry, 23 (4), pp. 337-351.
Abstract: Lipid peroxidation, specifically polyunsaturated fatty acid (PUFA) oxidation is highly deleterious, resulting in damage to cellular biomembranes, and may be a principal cause of several diseases in fish including jaundice and nutritional muscular dystrophy. Tissue lipid PUFA content and composition are critical factors in lipid peroxidation, as is the level of endogenous antioxidant molecules such as vitamin E. The primary objective of the present study was the characterization of antioxidant systems in a cultured juvenile marine fish, gilthead sea bream (Sparus aurata) with the underlying aim to understand how to avoid oxidation problems that may cause pathologies and disease and so to enhance growth and quality of early ongrowing stages. Juvenile sea bream were fed diets having either high or low levels of fish oil and supplemented or basal levels of vitamin E with PUFA/vitamin E ratios ranging from 117 ± 12 in the diet with low PUFA supplemented with vitamin E to 745 ± 48 in the diet with high PUFA with no additional vitamin E. None of the diets had serious deliterious effects on growth or survival of the fish, but the different dietary regimes were effective in significantly altering the PUFA/vitamin E ratios in the fish livers with values ranging from 5.7 ± 0.4 in fish fed the diet with low PUFA supplemented with vitamin E to 91.1 ± 13.2 in fish fed the diet with high PUFA with no additional vitamin E. This had effects on the peroxidation status of the fish as indicated by the significantly altered levels of in vivo lipid peroxidation products measured in liver, with fish fed the diet rich in PUFA and low in vitamin E showing significantly higher values of thiobarbituric acid reactive substances (TBARS) and isoprostanes. The isoprostane levels generally followed the same pattern as the TBARS levels supporting its value as an indicator of in vivo oxidative stress in fish, as it is in mammals. However, few significant effects on antioxidant enzyme activities were observed suggesting that more severe conditions may be required to affect these activities such as increasing the PUFA/vitamin E ratio or by increasing peroxidative stress through the feeding of oxidized oils.
Type: Journal Article
URI: http://hdl.handle.net/1893/2798
URL: http://www.springerlink.com/content/0920-1742/
DOI Link: http://dx.doi.org/10.1023/A:1011128510062
Rights: Published in Fish Physiology and Biochemistry by Springer.; The original publication is available at www.springerlink.com
Affiliation: University of Cadiz
University of Cadiz
Aquaculture
Aquaculture

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