Ecological Risk Screening Summary - Grayling (Thymallus thymallus) - Uncertain Risk

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

The history of invasiveness is not documented. No records of actual impacts from an introduction were found. Also, many records of introduction were contradicted in other sources that would list Thymallus thymallus as native to the area in question. The climate match was high, 0.248. The certainty of the assessment is medium, mainly due to the confusion in the native or invasive status of the species in many countries. The overall risk category is uncertain.