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The invasive amphipod Pontogammarus robustoides G.O. Sars, 1894 was first recorded in Lake Ladoga in August 2006 during an expedition by the Institute of Limnology Russian Academy of Sciences to investigate the lake’s littoral zone. The species was found associated with another alien amphipod, Gmelinoides fasciatus, in a shallow littoral area of the Volkhov Bay. The biomass of the two amphipod species was 25.2% and 15%, respectively of the total macrobenthos, with 1456 and 864 mg WW m -2 . The appearance of P. robustoides in Lake Ladoga is of great concern as this new invader may alter the ecological balance in the littoral zone of the largest European lake.