How we detect Topmouth gudgeon
Occurrence density
Where Topmouth gudgeon has been recorded
Aggregated occurrence records across its known range.
The stone moroko, also known as the topmouth gudgeon, is a species of freshwater ray-finned fish belonging to the family Gobionidae, the gudgeons. This species is native to Asia, but has been introduced and is now considered an invasive species in Europe and North America. The fish's size is rarely above 8 cm, and usually 2 to 7.5 cm long.