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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...
In October 2007 an invasive alien species, the Chinese sleeper, Perccottus glenii Dybowski, 1877 (known also as the Amur sleeper), was recorded in carp ponds in Kraków-Mydlniki (southern part of Vistula River drainage). As far as we know, this is the uppermost site in the Polish part of the Vistula River drainage. Thirty-six individuals of P. glenii were collected during fishery works. Basic morphometric...
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