The topmouth gudgeon, Pseudorasbora parva, originating from eastern Asia, was accidentally introduced in European waters (1961) with stocking material of imported herbivorous fishes. In Poland it was first recorded in 1990 in the Barycz R. system – Fish Farm Stawno (SW, Poland); it probably came from Hungary with imported fry of Aristichthys nobilis. It was presumably from that region of Poland that it spread to other fish farms and then rapidly penetrated into rivers and other water bodies. At present 51 localities are known, mainly in the lowlands of Poland. The species still shows an expansion tendency which is favoured by stocking open waters with material containing an admixture of the topmouth gudgeon, using it as a bait-fish and by some aspects of its biology and ecology.
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