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.
Ponticola ratan is a species of goby native to the Black Sea, Sea of Azov, and the Caspian Sea. This species has established a nonindigenous population in two inland reservoirs in Ukraine, possibly through shipping. No information is available on impacts of these introductions, so the history of invasiveness is classified as “none documented.” It does not appear that this species is in trade in the United States or elsewhere. The climate match with the contiguous United States is high overall, with the highest matches occurring in the Great Lakes region and the Interior West. Due to lack of information on impacts of introduction, the certainty of assessment is low. The overall risk posed by P. ratan is uncertain.
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Uncertain Risk
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