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BackgroundFreshwater zooplankton is an important component of the ecological communities of inland water bodies. It acts as an important part of the food web and participates in the self-purification processes of aquatic ecosystems. To study the abundance and distribution of species, a sampling event dataset was compiled and then published through GBIF. The aim of the work was to describe the current zooplankton fauna (  Rotifera  ,   Cladocera   and   Copepoda  ) and its abundance, based on a recently published dataset. The research was conducted from 2015 to 2022. Zooplankton samples were collected by vertical towing a plankton net (70 μm mesh) from the bottom to the water surface or by filtering through a net, the water being collected with a measuring bucket. The samples were concentrated to 100 ml and fixed with a final concentration of 4% formalin solution. For each sampling event, the coordinates of the location, number of individuals and date were recorded.New informationThe dataset contains information on 259 taxа, including 257 species and subspecies of zooplankton from 36 families found in the tributaries of the Cheboksary Reservoir. The families   Chydoridae   (35 species),   Brachionidae   (31) and   Cyclopidae   (27) were the most species-rich. Four invasive species were found:    Kellicottia   bostoniensis    (Rousselet, 1908),    Acanthocyclops   americanus    (Marsh, 1893),    Ilyocryptus   spinifer    Herrick, 1882 and    Thermocyclops   taihokuensis    Harada, 1931.

Biodiversity of zooplankton ( Rotifera , Cladocera and Copepoda ) in the tributaries of Cheboksary Reservoir (Middle Volga, Russia)