Eel is a type of fish that can be found in both salt and fresh water. The five letter solution ELVER refers to the juvenile stage of the eel, which is also known as an ELVER. MORAY is another five letter solution, which refers to a type of eel that is found in tropical and temperate waters. CONGER is a six letter solution, which is a type of eel that is found in the Atlantic Ocean. LAMPREY is a seven letter solution, which is a type of eel that has a jawless, eel-like body. Finally, GRIG is a four letter solution, which is a type of small eel found in Europe.