This figure is the Japanese eel (nihon unagi in Japan), Anguilla japonica, model sculpt 23 and number 8 from the second series. This is the only freshwater eel found in Japan, although it is found throughout Eastern Asia as far south as Vietnam. Like many other freshwater eels, the Japanese Eel is catadromous, spawning and hatching at sea but living much of their life in freshwater habitats and brackish estuaries.
