Ecological Risk Screening Summary - Bloody Red Shrimp (Hemimysis anomala) - High Risk

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.

Hemimysis anomala, the Bloody Red Shrimp, is a crustacean that is native to the nearshore habitats in the Ponto-Caspian region. It has spread widely throughout Europe through deliberate
introductions to support fisheries, accidental transport in ship ballast, and dispersal through canal systems. This species has been introduced to the Great Lakes via ballast water. The states of New
York and Wisconsin have prohibited possession of this species. The History of Invasiveness for Hemimysis anomala is classified as High due to multiple negative impacts of its introduction
documented in Europe including changes in zooplankton communities and changes in food webs. The climate matching analysis for the contiguous United States indicates establishment
concern for this species. The climate match was highest in the area surrounding the Great Lakes basins, where the species has already been documented. The Certainty of Assessment for this
ERSS is classified as High. The Overall Risk Assessment Category for Hemimysis anomala in the contiguous United States is High.