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The aim of this research was to assess the distribution, abundance and growth of thenon-native topmouth gudgeon Pseudorasbora parva that was recorded for thefirst time in the Tiber River Basin (central Italy) in 1994. The competitive interactionof P. parva with four native fish species was also investigated. Thestudy area comprised 92 watercourses of the Umbrian section of the Tiber River Basin.Demographic and environmental data were collected during the period 1990−2014 in 171 sampling sites. The results ofthis study showed a wide distribution of P. parva in the study area, withrecords from 23.39% of all sampling sites (40 out of 171). This species inhabits thedownstream reaches, where the presence of many non-native species and the poorenvironmental quality are associated with a decrease in native fish species. A total of5570 specimens of P. parva were collected and five age classes(0+ to4+) wereidentified. The equation for the total length-weight relationship of P. parvawas W =0.021TL2.673±0.015.For the chub Squalius squalus, the Tiber barbel, Barbustyberinus, and the roach, Rutilus rubilio, the average valuesof the relative weight were significantly higher in the sites where P. parvawas absent. The results of the present study suggest the need to undertake properstrategies for native biodiversity conservation

Status ofPseudorasbora parvain the Tiber River Basin (Umbria, central Italy) 20 years after its introduction