Ecological Risk Screening Summary - Cherry Shrimp (Neocaridina davidi) - High Risk

Species that are considered high risk have a well-documented history of invasiveness in at least one location globally and are of establishment concern for the contiguous United States based on a climate matching analysis.

Neocaridina davidi, Cherry Shrimp, is a small shrimp native to China, Korea, Taiwan, and Vietnam. It has been transported around the world via the aquarium trade as one of its most popular ornamental shrimp species. N. davidi is now established outside its native range in Hawaii, Canada, France, Germany, Hungary, Poland, Slovakia, Reunion, Japan, and China, with introductions also reported in Brazil and Ukraine. However, the population in Canada and many of those in Europe are restricted to thermal or thermally polluted waters. N. davidi alters meiofaunal communities through predation, and there is some evidence of displacement of native shrimp in multiple locations where Neocaridina davidi has been introduced. The History of Invasiveness for Neocaridina davidi is classified as High due to these established populations and negative impacts of introduction. The climate matching analysis for the contiguous United States indicates establishment concern for this species. The climate match results yielded a high match in the Great Lakes region, north-central New Mexico, peninsular Florida, the southern Great Plains, and scattered through the Rocky Mountains. Confusion regarding unresolved taxonomy of the genus Neocaridina reduced confidence in the accuracy of the reported distribution of N. davidi. Based on this uncertainty and the limited information available on negative impacts of introduction, the Certainty of Assessment for Neocaridina davidi is classified as Low. The Overall Risk Assessment Category for Neocaridina davidi in the contiguous United States is High.