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The quantitative requirement for α-tocopherol by juvenile African catfish, Clarias gariepinus Burchell

Published online by Cambridge University Press:  02 September 2010

R. T. M. Baker  and
S. J. Davies
R. T. M. Baker
Affiliation:
Department of Biological Sciences, University of Plymouth, Plymouth PL4 8AA
S. J. Davies
Affiliation:
Department of Biological Sciences, University of Plymouth, Plymouth PL4 8AA
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Abstract

Employing practical-type diets containing graded levels of all-rac-α-tocopheryl acetate (0, 5, 15, 30, 45, 60, 75 or 100 mg/kg), the quantitative requirement for a-tocopherol by juvenile African catfish (Clarias gariepinus Burchell) was investigated. Diets, defined with respect to selenium, fatty acid and ascorbate inclusion, were offered for 12 weeks during which catfish grew from 10 g to 120 g. Dietary regime had no significant effect on growth (P > 0·05), although haematocrit values increased with increasing tocopherol dose above 15 mg/kg (assayed) (R2 = 0·71, P < 0·05). Tissue accretion of the vitamin increased concomitant with dietary dose (P < 0·001). Employing a colorimetric assay for thiobarbituric acid reactive substances (TBARS) it was evident that concentration ofTBARS in muscle and liver reflected tissue oxidation status, in that elevated dietary vitamin E resulted in decreased assayed TBARS (P < 0·05). By broken-line analysis the requirement for this species to suppress lipid peroxidation was estimated as 30 to 40 mg all-rac-a-tocopheryl acetate per kg dry diet and this agrees with published requirements of many fish species.

Keywords

Clarias gariepinusfishesα-tocopherolvitamin E
Type
Research Article
Information
Animal Science , Volume 65 , Issue 1 , August 1997 , pp. 135 - 142
Copyright
Copyright © British Society of Animal Science 1997

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