Abstract

The Ponto–Caspian predatory cladoceran Evadne anonyx G.O. Sars, 1897 was first recorded in the eastern Gulf of Finland in the zooplankton samples collected during summer 2000. Most likely, E. anonyx invaded the gulf in the late 1990s from the Caspian Sea via the Volga–Baltic waterway through the transport of ballast water of ships. Between 2000 and 2004, the population densities of E. anonyx increased in the eastern Gulf of Finland more than 10-fold, indicating successful establishment of the new Ponto-Caspian invader in the Baltic Sea.

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