Species that are considered high risk have a well-documented history of invasiveness in at least one location globally, and a high or medium climate match to the contiguous United States.
Establishment of S. erythrophthalmus is occurring in the United States, Canada, and Eurasia. Climate match is high, so there is a high likelihood that S. erythrophthalmus will establish itself in new waterways, if allowed to invade them. The species is known to change macrophyte communities through selective grazing, which has sometimes contributed to regime shifts in the lakes it has invaded. Overall risk for this species is high.
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High Risk
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