Fatty Acid Composition and ω3/ω6 Ratios in the Muscle of Wild and Reared Oncorhynchus mykiss

The fatty acid composition and ω3/ω6 ratios in the muscle of wild and reared Oncorhynchus mykiss (rainbow trout) in the Tohma River (Sivas, Turkey) were determined by gas chromatography. There were quantitative differences between some fatty acids in the muscles of wild and reared rainbow trout. The most abundant fatty acids in both wild and reared fish were palmitic acid (16:0), stearic acid (18:0), oleic acid (18:1 ω9), and docosahexaenoic acid (22:6 ω3). The levels of ω3 series and ω6 series fatty acids in wild fish muscle were higher than in the reared fish. The ω3/ω6 ratios in muscle were found to be 1.92 (reared fish) and 2.28 (wild fish). The higher ω3/ω6 ratio in the wild fish might be a result of the season and the richer feeding conditions in the river under natural conditions. However, daily and continuously reared fish might be turned into more beneficial food for human consumption.