| Summary: | Availability of water resources for the fisheries of the Lower Don River is considered. Abundance and biomass of the European anchovy (Engraulis encrasicolus) breeders in the North-Eastern Black Sea are assessed based on the data from ichthyoplankton surveys. Limiting factors of the abiotic environment and biological characteristics of important commercial migratory fish species of the Azov Sea are investigated. Distribution of the juveniles of common roach Rutilus rutilus, common bream Abramis brama, vimba bream Vimba vimba, and zander Sander lucioperca in the Lower Don in low-water year of 2017 is studied. Current state of zooplankton in Lake Urozero (the Republic of Karelia) and in the Chogray Reservoir is presented. Zooplankton species composition in the Lower Don is characterized. Seasonal variations at the stages of production and destruction succession in the microplankton off the Crimean Coast and deep waters of the Northern Black Sea on the basis of ATP and chlorophyll α analysis are estimated. Current state of aquatic biological resources in the Balkhash-Ili Basin (Kazakhstan) is investigated. Published
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