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The paper reports the first records of non-indigenous Ponto-Caspian gammarid species: Pontogammarus robustoides (G. O. Sars, 1894), Obesogammarus crassus (G. O. Sars, 1894), Dikerogammarus haemobaphes (Eichwald, 1841) and the latest colonizer - Dikerogammarus villosus (Sowinsky, 1894) - in the Gulf of Gdańsk (southern Baltic Sea).
This communication reports on the occurrence of non-indigenous gammarid species of Ponto-Caspian and of North American origin - in the lower course of the River Vistula, in its Delta and in the Vistula Lagoon.
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