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The fatty acid composition of the liver oil from the Black Sea dogfish Squalus acanthias , as well as its seasonal variations were determined. A scheme for concentration of polyunsaturated fatty acids from the dogfish liver oil by urea complexation was proposed. From 360g of free fatty acids a 48g concentrate was obtained, containing 7,8% C 20:4 , 16,4% C 20:5 . 9,2% C 22:5 and 49,7% C 22:6 .

Preparation of polyunsaturated fatty acid concentrates from the liver oil of dogfish (<i>Squalus acanthias</i>) from the Black Sea.