The fatty acid compositions of liver and muscle of male and female Salmo trutta macrostigma, in the Tohma River, Turkey, were determined by gas chromatography. There were quantitative differences between individual fatty acids in the tissues investigated, depending on the sex. The most abundant fatty acids in both tissues of both sexes were palmitic acid (C16:0; 19.0-21.6%), stearic acid (C18:0; 5.32-11.3%), C18:1 omega-7 (5.65-9.38%), oleic acid (C18:1 omega-9; 15.6-22.4%), eicosapentaenoic acid (EPA; C20:5 omega-3; 6.34-7.88%) and docosahexaenoic acid (DHA; C22:6 omega-3; 7.38-15.6%). The omega-3/omega-6 ratio in tissues were found to be 2.89 (male) and 1.97 (female) in liver, and 2.59 (male) and 2.26 (female) in muscle. S. trutta macrostigma may be a valuable food for human consumption in terms of fatty acids. (C) 2008 Elsevier Ltd. All rights reserved.