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.
Redeye Piranha (Serrasalmus rhombeus) is a species of piranha native to northern South America. It is present in the aquarium trade, including in the United States, and is a minor target for commercial fishing. S. rhombeus can be harmful to humans through its aggressive behavior and bioaccumulation of mercury (when caught in areas with mercury contamination and eaten). The species is host to numerous parasites. S. rhombeus has been introduced to Florida three times; one introduction resulted in an established population that was intentionally extirpated after 13 or 14 years, while the other two appear to have failed before establishment occurred. No other introductions have been reported, and the impacts of introduction are unknown. Numerous U.S. States prohibit the import of piranhas. History of invasiveness is classified as Data Deficient. Climate match to the contiguous United States was medium overall, with the highest match in southern Florida where the species was previously established. Certainty of assessment is low due to lack of information about impacts. Overall risk posed by S. rhombeus is Uncertain.
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Uncertain Risk
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