Eels are fish that can be found in both salt and fresh water.
There are more than 400 species of eels, including the electric eel.
Eels have long bodies, sharp teeth and gills.
Eels like to hide in rocks and small caves in the sea.
Eels can grow up to 4 metres in length.
Eels have poor eyesight so if you feed one, it may accidentally bite your finger.
Eels are often mistaken for sea snakes.