Naturalized in 1988. Established in Northern Italy, expanding in central Italy (Ref. 45688). Found in the River Po in 1990 as reported from FISH Magazine of the Institute of Fisheries Management, Nottingham UK. Introduced accidentally into the Po and Tevere basins (Ref. 27118), Tuscany (Ref. 97736). Recorded for the 1st time in the Grosseto Province, now established in the middle and lower courses of the Ombrone, Albegna and Fiora. Found at a wide size range. Is also locally abundant (Ref. 45688). Invasive in north, central, and southern Italy (Ref. 119201). Interferes with native cyprinids (Ref. 94493). Has been reported in the shallow marine waters of the Tyrrhenian Sea (Ref. 97736).