The contents of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in the tissues of fishery products in Hokkaido prefecture were investigated with open-tubular gas-chromatography.

The major components of fatty acids of the present samples were 14 : 0, 16 : 0, 16 : 1(n-7), 18 : 0, 18: 1(n-9)1, 8: 1(n-7)1, 8: 2(n-6)1, 8: 4(n-3)2, 0: 1(n-11)2,0 : 1(n-9)2, 0 I (n-7) ,20: 5(n-3)2, 2: 1(n-ll,n-13), 22 : l(n-9), 22 : 5(n-3) and 22: 6(n-3).

The liver of the Japanese flying squid is rich in EPA and DHA. The contents of EPA and DHA were more than 4g and 5g per 100g of wet tissues, respectively. Therefore, it is expected that Japanese flying squid liver will be useful from which to extract EPA and DHA.