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The stone moroko (Pseudorasbora parva), 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 (0.79 to 2.95 in) long.
Stone moroko has a superior mouth Topmouth Gudeons may have varying colors in the spawning season