Ecological Risk Screening Summary - Flathead Chub (Platygobio gracilis) - Uncertain Risk

Platygobio gracilis, the Flathead Chub, is a fish native to central and western drainages in the United States and Canada. An opportunistic invertivore, P. gracilis has been found to eat aquatic and terrestrial insects and algae. P. gracilis is found in turbid flowing waters in main channels of small to large rivers. Although it has been introduced via bait bucket releases, there is no further information on P. gracilis use in trade. The History of Invasiveness for P. gracilis is classified as Data Deficient due to a lack of information regarding negative impacts of its introduction. The climate matching analysis for the contiguous United States indicates establishment concern for this species outside its native range. The areas of highest match were generally found in the central United States where this species is native. The Certainty of Assessment is classified as Low due to a lack of information on impacts of P. gracilis where it has been introduced. The Overall Risk Assessment Category for P. gracilis in the contiguous United States is Uncertain.