Ecological Risk Screening Summary - Melanotaenia nigrans (a fish, no common name) - 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.

Melanotaenia nigrans is a tetra (fish) endemic to tropical Australia. The history of invasiveness is No Known Nonnative Population. M. nigrans has been reported in Illinois and Philippines. The population in Illinois did not become established and no information on impacts of introduction have been reported. The status of the introduction in the Philippines is unknown. This fish is found in the aquarium trade but it is unclear as to what extent. The climate match for the contiguous United States is medium. Arizona, Florida, New Mexico, and Texas had individually high climate scores while California and Georgia had medium climate scores. The certainty of assessment is low. The overall risk assessment category for Melanotaenia nigrans is uncertain.