Ecological Risk Screening Summary - Serrasalmus nalseni (a piranha, no common name) - Uncertain Risk

Species that are considered uncertain risk need a more in-depth assessment beyond the Risk Summary to better define the species’ risk to U.S. environments.

Serrasalmus nalseni is a species of piranha native to the Amazon and Orinoco River basins in Colombia and Venezuela. Very little is known about this species. No introductions of S. nalseni have been reported in the United States or elsewhere outside its native range. There was no evidence of trade in S. nalseni in the United States, but numerous states prohibit the possession or trade of piranhas. History of invasiveness is classified as No Known Nonnative Population. Certainty of assessment was low due to the limited number of georeferenced locations available for the climate match and lack of introductions. The climate match with the contiguous United States was low, with medium matches found only in southern Florida and southern Texas. Overall risk posed by S. nalseni is uncertain.