PRIOR to the War, the fish oil industry was successfully applying to problems of production the results of recent research, particularly with respect to vitamins A and D. The liver oils from some species possess extraordinary potency, thus the blue–fin tuna or horse mackerel yields oil containing up to 400,000 I.U./gm. of vitamin A and 60,000 I.U./gm. of vitamin D as compared with 800 I.U./gm. (A) and 100 I.U./gm. (D) for average cod liver oil. The soupfin shark liver contains 40–70 per cent of oil the vitamin A potency of which is frequently more than 100,000 I.U./gm., but on the other hand it is very poor in vitamin D, the potency being only about 20 I.U./gm. This oil is produced on a large scale in California at relatively small cost, and is probably the cheapest source of vitamin A in a highly competitive market.

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    1. 1

      Lovern, Edisbury and Morton, NATURE, 111, 234, 276.

    2. 2

      "The Chemistry and Technology of Marine Animal Oils with particular reference to those of Canada", Bull. 59, Fisheries Research Board of Canada, 1941.

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    FISH OILS. Nature 148, 292 (1941).

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