Composition of n-3 oils from some great lakes freshwater fish

Abstract

Lipids from Salvelinus namaycush siscowet (siscowet lake trout), S. namaycush namaycush (lake trout), and S. fontinalus (brook trout) from the Great Lakes showed similar fatty acid profiles. The Salvelinus sp. oils contained about 4% eicosapentanenoic acid (EPA; C 20:5n3) and between 5.9 and 9.6%n docosahexaenoic acid (DHA; C 22:60). Siscowet lake trout contained 36% fat (wet wt) and 31% of the lipid fraction was oleic acid while other trout contained from 7 to 10% fat of which 17–26% was oleic acid. Siscowet lake trout oil contained 26 ppm Aroclor 1260 polychlorinated biphenyls (PCB), and only one-half to two-thirds of this was removed by steam deodorization. Alewife ( Alosa pseudoharengus) oil contained 8.6% EPA (C 20:5n3) and 8.6% DHA (C 22:60). Oil rendered from Lake Michigan whitefish ( Coregonus clupeaformis offal contained 7.8% EPA (C 20:5n3) and 2.9% DHA (C 22:6n3) and less than 0.1% ppm of PCB.