Ecological Risk Screening Summary - Common Nase (Chondrostoma nasus) - High Risk

Species that are considered high risk have a well-documented history of invasiveness in at least one location globally, and a high or medium climate match to the contiguous United States.

Chondrostoma nasus, the Common Nase, is a predominantly herbivorous/ detritivorous cyprinid that is native to medium and large rivers across much of Europe. There are some small variations in regards to its native range within Europe, but this is unlikely to have an effect on the overall climate match for the contiguous United States. Primary human uses of C. nasus include consumption and sport fishing, but neither appear to be a driver behind any of the introductions outside the native range. Reported introductions seem to have occurred largely through dispersion and via artificial canals and connections between basins. When introduced and established, C. nasus is reported to outcompete and eliminate native congeners which exist in a similar niche. Because of these detrimental effects on native cyprinids, the history of invasiveness is categorized as high. The climate match for the contiguous United States is also rated as high with a climate match score of 0.265. The certainty of assessment is high due to the quality and quantity of information available for this species. The overall risk assessment category is high.