The conversion of linoleic acid and linolenic acid to longer chain polyunsaturated fatty acids by Tilapia (Oreochromis) nilotica in vivo |
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| Authors: | R E Olsen R J Henderson B J McAndrew |
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| Institution: | 1. Holt Agricultural Research Station, P. O. Box 100, N-9001, Troms?, Norway
3. Institute of Aquaculture, University of Stirling, Stirling, FK9 4LA, UK
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| Abstract: | Tilapia (Oreochromis) nilotica were fed either a commercial diet containing 2.2% (n-3) and 0.5% (n-6) polyunsaturated fatty acids (PUFA), or a diet containing
1.0% methyl linoleate as the only PUFA. The fatty acid composition of tissue lipids generally reflected that of the diet.
Fish from both dietary groups were injected intraperitoneally with 14C-labelled linoleic acid, 18:2 (n-6), or linolenic acid, 18:3 (n-3), and the distribution of radioactivity in tissue lipids
examined. The conversion of both 18:2 (n-6) and 18:3 (n-3) to longer chain PUFA was lower in fish fed the commercial diet
than in those fed the diet containing only 18:2 (n-6). Half of the radioactivity from both substrates recovered in liver polar
lipids was present in C20 and C22 PUFA with fish maintained on the experimental diet. It is concluded that T. nilotica is capable of elongating and desaturating both 18:2 (n-6) and 18:3 (n-3), but that this conversion is suppressed by dietary
longer chain PUFA.
NERC Unit of Aquatic Biochemistry |
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| Keywords: | tilapia polyunsaturated fatty acids lipids desaturation diet |
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