The component fatty acids of some New Zealand fish oils

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Abstract
The compositions of the liver oils of red cod (Physiculus bachus) and the "English" hake (Merluccius gayi), and the head oil of the groper (Polyprion oxygeneios) conform generally to the typical North Sea fish oils. Groper liver oils, especially the samples taken during spring, were characterized by abnormally high proportions of palmitic and hexadecenoic acids, together with diminished proportions of C20- and C22-unsaturated acids. The spring and early and late winter groper liver oils contained, resp., a trace, 2.0 and 18.8% of phosphatide calculated as lecithin. The phosphatide fatty acids showed the typical increase in the proportions of C20- and C22-unsaturated acids as compared with those of the corresponding glyceride. On the basis of Lovern''s hypothesis of molecular filtration, the abnormal composition of groper liver oils might be associated with the relative impermeability of the liver, which in this case also was subordinate as a fat depot to the main fat depots in the head and body.

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