Sex-linked differences in fatty acid composition of rainbow trout (Oncorhynchus mykiss) liver oil

Fatty acid analysis of the liver oil of male and female farmed rainbow trout (Oncorhynchus mykiss) was carried out by gas-liquid chromatography with flame ionization detection (FID). The polyunsaturated fatty acid fraction was much higher in males than in females, while the opposite was true for the mono-unsaturated fatty acid fraction. − 3 series fatty acid content is greater than the n − 6 series fatty acid content. Docosahexaenoic acid (DHA) appears, in both types of sample, in greater amounts than eicosapentaenoic acid (EPA). In general, values found for female samples are in line with those reported in the literature. Male samples, although they followed the same pattern, showed significant differences (P < 0.05) from females. gh DHAEPA ratios found in rainbow trout liver oil make it suitable for industrial uses, such as infant formula supplementation.