Ecological Risk Screening Summary - Redtail Notho (Nothobranchius guentheri) - 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.

Redtail Notho (Nothobranchius guentheri) is a fish native to Tanzania. Nico and Neilson (2019) lists Nothobranchius guentheri as introduced in California, Hawaii, Turkey, Solomon Islands, and India due to mosquito control. The introductions have failed and do not indicate an established population therefore the history of invasiveness is classified as “No Known Nonnative Population.” The climate match for the contiguous United States is low, with small patches of medium match in southern Texas and Florida. All states received individually low climate scores except for Florida, which had an individually medium climate score. The certainty of assessment is low. The overall risk assessment category for Nothobranchius guentheri is uncertain.