Acheilognathus typus (species of bitterling-like cyprinid)
A freshwater fish native to Japan, similar to the bitterling. Typically written in katakana in biological contexts.
The Acheilognathus typus is a species endemic to Japan and is threatened with extinction.
The name ゼニタナゴ literally means 'coin bitterling', likely from the shape of the fish. The exact derivation is uncertain.