Vitamin A and carotenoids in certain invertebrates. III. Euphausiacea

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Abstract
Our published work has shown that the northern euphausiids, Meganyctiphanes norvegica, Thysanoessa raschii and T. inermis, contain much higher concentrations of vitamin A than we have found in any other marine Crustacea (Kon & Thompson, 1949a; Batham, Fisher, Henry, Kon & Thompson, 1951; Fisher, Kon & Thompson, 1952, 1953, 1954). In the antarctic species, Euphausia superba, the concentration of vitamin A in samples taken from the alimentary canals of baleen whales (Thompson, Ganguly & Kon, 1949; Kon & Thompson, 1949b) was similar to that found in Meganyctiphanes norvegica from the gut of arctic baleen whales (Fisher et al., 1952), but both were very much lower than in free-swimming M. norvegica. No corresponding free-swimming specimens of Euphausia superba had been analysed.