Abstract
AbstractIn the soupfin shark the iodine value of the liver oil of the mature fish tends to increase with increase in the oil content of the liver. Determination of the component fatty acids of a composite sample of liver oil from females in fat condition and another from thin (gravid) females showed that this effect is due to the greater degree of unsaturation of the C16, C18, C20 and C22 acids in the fat fish. The component fatty acids of a composite sample of foetus liver oil were also examined. It is suggested that there may be a transference of highly unsaturated C18, C20 and C22 acids from the female to the foetus during gestation. The unsaponifiable fractions of five soupfin shark liver oils were quantitatively examined. In the mature fish, vitamin A, α‐glyceryl ethers and sterols are major components of the unsaponifiable fraction, whereas in the foetus, sterols predominate. Evidence for the presence of fatty alcohols in the unsaponifiable fraction of the liver oils from both the foetus and the mature fish is presented.
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