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.
Eastern Mosquitofish (Gambusia holbrooki) is native to the eastern United States. The history of invasiveness of Gambusia holbrooki is high. Invasion and establishment of the mosquitofish is occurring in the United States and around the world. Significant adverse impacts are also occurring in invaded waterways and risk of this species moving to new waterways is high. This species has been responsible or partially responsible for negative impacts, including extirpation, on Threatened and Endangered species. The climate match is high, indicating there are suitable areas within the United States for this species to expand into that are outside of the species’ native range. The certainty of assessment is high. The overall risk assessment category is high.
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High Risk
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