LIPID CONTENT AND FATTY ACID COMPOSITION OF ARCTIC CHARR (SALVELINUS ALPINUS L.) REARED AT DIFFERENT STOCKING DENSITIES

Abstract

ABSTRACT The total lipid content and lipid fatty acid composition of fillets of Arctic charr, stocked at 40, 50 and 75 kg/m 3 , were determined. Lipid contents of fish fillets increased during the 24 weeks of rearing period, but were unaffected by stocking density (r =−0.7030). Lipid fatty acid composition of Arctic charr fillets remained relatively unchanged from week 8 of feeding, thus reflecting a turn‐over period of less than 8 weeks for intramuscular inclusion of dietary lipids. Among density groups, content of individual fatty acids of fish flesh were similar. Unsaturated fatty acids were dominant in charr flesh and accounted for up to 75% of the total amounts. The contents of saturated and monounsaturated fatty acids were inversely related to stocking density (r =−0.9914 and −0.9963, respectively), whereas those of polyunsaturated fatty acids were directly related to stocking density (r = 0.9984).

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