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Freshwater zooplankton, which is commonly used as a starting fish feed, has a low content of essential compounds such as carotenoids. The possibility of increasing the productivity of carotenogenic yeast,  Rhodotorula glutinis , for further bioencapsulation of zooplankton  Daphnia magna  is shown. An association of a UV irradiated yeast strain with lactic acid bacteria was cultivated for this purpose. This permitted intensifying the carotenogenesis of yeast, and the content of â-carotene increased by 1.7 times, and that of torularodine by 2.3 times compared with the native monoculture. The use of the association of microorganisms as a feed substrate in the cultivation of  Daphnia magna  provided both an increase in the carotenoid content in the investigated crustaceans more than 8 times, and their biomass by 2.5 times compared with the standard feed of  Saccharomyces cerevisiae .

Application of an association of yeast and lactic acid bacteria to bioencapsulate carotenoids in Daphnia magna (Straus, 1820)