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|Title:||Manipulation of fatty acid composition of Nile tilapia (Oreochromis niloticus) fillets with flaxseed oil|
|Author:||De Souza, N.E.|
De Oliveira, C.C.
|Abstract:||Nile tilapia (Oreochromis niloticus) is one of the most consumed species among freshwater fish reared in Brazil. However, studies show low levels of n-3 fatty acids in freshwater fish reared in captivity in comparison with those reared in their natural habitats. The Nile tilapia used in this study were raised in captivity for a period of 5 months and fed varying amounts (0, 1.25, 2.5, 3.75 and 5%) of flaxseed oil as a substitute for sunflower oil (control). No significant differences (P > 0.05) in total lipid (TL) content were found between fillets of tilapia fed the different diets. TL analysis of fatty acid methyl esters by capillary gas chromatography revealed a total of 50 components common to all treatments studied. The major fatty acids present were linoleic acid (18:2n-6), oleic acid (18:1n-9) and palmitic acid (16:0). All treatments led to significant % increases in α-linolenic acid (18:3n-3), eicosapentaenoic acid (20:5n-3) and docosahexaenoic acid (22:6n-3). Increases in both total n-3 fatty acids and total polyunsaturated fatty acids were observed concomitantly with decreases in total n-6 fatty acids, resulting in increases in n-3/n-6 ratio, with increasing level of flaxseed oil in the feed. Thus feed supplementation with flaxseed oil contributed greatly to raising the nutritional lipid value of Nile tilapia fillets.|
|Subject:||Tilápia do Nilo|
Óleo de linhaça
|Editor:||John Wiley & Sons|
|Appears in Collections:||FEA - Artigos e Outros Documentos|
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