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.
Ballerus sapa is a cyprinid fish that is widespread in many large rivers in Europe and Asia in drainages of the Black Sea, Caspian Sea, and Aral Sea. It has established in several locations in Europe outside its native range; spread has occurred primarily through man-made canals. Climate match with the United States is high, with the Great Lakes basin being the most likely habitat for this species. More research on the impacts from introductions of this species is needed; the absence of this research makes the certainty of this assessment low. Overall risk posed by this species is uncertain.
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Uncertain Risk
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