Ecological Risk Screening Summary - Silver Dollar Fish (Mylossoma duriventre) - Uncertain Risk

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.

Mylossoma duriventre, Silver Dollar Fish, is a fish native to the Paraguay, Parana, and Uruguay River Basins of central South America. It is an herbivorous fish found in freshwater floodplain habitats and is reported to be tolerant of low oxygen conditions. M. duriventre is a popular target for commercial and sport fishing in its native range and can be found for purchase online from aquarium retailers. The History of Invasiveness for Mylossoma duriventre is classified as No Known Nonnative Population due to the lack of known established populations outside its native range and limited available information on the true extent of its trade. The climate matching analysis for the contiguous United States indicates establishment concern for this species; high climate matches were found along the Gulf Coast, Atlantic Coast, and in the Southern Plains. The Certainty of Assessment for this ERSS is classified as Low due to limited information on introductions, impacts, and trade history, as well as the confusion caused by recent taxonomic work that narrowed the definition of the species. The Overall Risk Assessment Category for Mylossoma duriventre in the contiguous United States is Uncertain.