Lipid characteristics of two subtropical Seriola fishes, Seriola dumerili and Seriola rivoliana, with differences between cultured and wild varieties.

The lipid and fatty acid compositions of the muscle and liver of two subtropical Seriola fish species, Seriola dumerili and Seriola rivoliana, were investigated. The lipid levels of cultured S. dumerili were significantly higher than were those of the wild ones. Triacylglycerols and phospholipids were the dominant lipids of both the cultured and wild. In both species, the major fatty acids in the muscle and liver triacylglycerols were 14:0 (cultured), 16:0, 18:0, 16:1n-7, 18:1n-7, 18:1n-9, 18:2n-6 (linoleic acid: LA, cultured), 20:5n-3, and 22:6n-3. In spite of similar levels of many of the fatty acids between cultured and wild triacylglycerols, the cultured samples had markedly higher levels of LA with trace levels of 20:4n-6 (arachidonic acid: ARA) and 22:5n-6, while the wild ones had very low 18:2n-6 levels with small levels of ARA and 22:5n-6. The ratio (R(LA/ARA)) of LA to ARA in the cultured samples was markedly higher than were those of the wild samples.