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.
Serresalmus nigricauda is a piranha native to Argentina. Although there is no evidence of trade of this species in the United States, possession or trade of piranhas is prohibited by many U.S. States. No reported occurrences, either within or beyond the native range, have been documented since the original identification of the species. There is some disagreement about whether S nigricauda is a valid species. The history of invasiveness is classified as No Known Nonnative Population. The climate match to the contiguous United States was low overall, with high matches in parts of Texas and Florida. However, the climate match was based on a verbal description of the type locality since no georeferenced points were available. Certainty of assessment is low given the taxonomic uncertainties and lack of georeferenced occurrences for a climate match. Given these factors, the overall risk assessment for Serrasalmus nigricauda is Uncertain.
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Uncertain Risk
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