Simple lipids include fatty acids and triacylglycerols. Fish
typically require fatty acids of the omega 3 and 6 (n-3 and
n-6) families. Fatty acids can be: a) saturated fatty acids
(SFA, no double bonds), b) polyunsaturated fatty acids
(PUFA, >2 double bonds), or c) highly unsaturated fatty
acids (HUFA; > 4 double bonds). Marine fish oils are naturally
high (>30%) in omega 3 HUFA, and are excellent
sources of lipids for the manufacture of fish diets. Lipids
from these marine oils also can have beneficial effects on
human cardiovascular health.