European eel

The European eel ("Anguilla anguilla") is a species of eel, a snake-like, catadromous fish. They are normally around 60–80 cm (2.0–2.6 ft) and rarely reach more than 1 m (3 ft 3 in), but can reach a length of up to 1.5 m (4 ft 11 in) in exceptional cases.
Description.
The European eel is a fish that resembles a serpent. It is a critically endangered species. Since the 1970s, the numbers of eels reaching Europe is thought to have declined by around 90% (possibly even 98%).