Abstract

The influence of different diets on cholesterol content of liver and muscle of European eel (Anguilla anguilla) was studied for the first time. In control eel, cholesterol constituted near 7.5% of total lipids in liver and about 1% in muscle. Feeding herring meal-55% diet produced a drastic increase in hepatic cholesterol after a 30 d period. In muscle, cholesterol content also increased after any dietary treatment. Free cholesterol represented about 34% of total cholesterol in liver and about 50% in muscle. In both tissues, these percentages increased after any experimental condition assayed. The n-3/n-6 ratio in the fatty acid composition was manifestly low in herring meal-55% diet, mainly due to the minimal amount of total n-3 fatty acids. This fact may account for the increase in liver cholesterol, bearing in mind the hypocholesterolemic effect of the polyunsaturated n-3 fatty acids.

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