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.
N. fluviatilis has invaded continental Europe and established new populations through diffusion and likely also shipping pathways. The species has become abundant in some locations. However, data on what impacts this invader might have on local ecosystems are extremely limited, and multiple studies have failed to find impacts among measured variables. Most of the concern surrounding this species comes from related species, such as the round goby (N. melanostomus), whose ability to invade and alter ecosystems is well known. N. fluviatilis exhibits high climate match to the contiguous U.S., particularly in the Great Lakes region and Interior West. Overall risk for this species is uncertain.
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Uncertain Risk
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