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Abstract

During austral summer phytoplankton is the main component of food of E. superba postlarval stages. Diatomeae: Thalassiosira spp., Nitzschia spp. and tiny Pennatae constitue 98% of all consumed food particles. 91% of algae consumed were of 8—40 μm, and their mean size is 21.4 μm. The mean amount of algae found in of Euphausia superba was about 1700 per individual. The differences in species composition and the size of algae eaten by juvenes, preadult and adult individuals decrease the food competition between particular age groups of E. superba.
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Abstract

In adults of both sexes of Euphausia superba analysed in total without alimentary tract there were identified with help of chromatographic and spectrophotometric methods: β-carotene, free and ester astaxanthine, cantaxanthine, β-cryptoxanthine. lutein and dihydroxy-ζ-carotene, and additionally in females zeaxanthine and flavoxanthine. However, particular parts of body (with an exception of eyes, legs and trunk) and especially the exosceleton cotain less carotenoids, mainly carotene and astaxanthine.
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