Ecological Risk Screening Summary - Northern Redbelly Dace (Chrosomus eos)

Species that are considered uncertain risk need a more in-depth assessment beyond the Ecological Risk Screening Summary to better define the species’ risk to U.S. environments.

Chrosomus eos, Northern Redbelly Dace, is a fish native to the northeastern and north central United States, and southeastern, central, and northwestern Canada. Chrosomus eos is known to hybridize with other species within Chrosomus. There is a history of Chrosomus eos being sold in the bait trade as a contaminant of fathead minnow stocks. There is also some evidence for Chrosomus eos in the aquarium trade. Introductions outside of the species’ native range in the United States have occurred but none have resulted in a known established population. No information was found regarding any impacts from those introductions. The History of Invasiveness for Chrosomus eos is classified as No Known Nonnative Population due to the lack of information supporting the existence of an established nonnative population. The climate matching analysis for the contiguous United States indicates establishment concern for this species outside its native range. Climate matching found areas of high and medium climate match extending south and west from the native range of Chrosomus eos into the Great Basin and Southeast. The Certainty of Assessment for this ERSS is classified as Low due to lack of information needed to evaluate the species’ history of invasiveness. The Overall Risk Assessment Category for Chrosomus eos in the contiguous United States is Uncertain.