While Salmon and Sea Trout migrate from the sea to spawn in freshwaters, European Eels do the reverse – living in freshwaters and spawning in the Sargasso Sea area. A long black snake-like species usually sold live, they grow up to 1m long (1.2kg), and wriggle furiously – even when beheaded. Not to be confused with the Conger Eel - a different species, not found in freshwaters. Elvers are baby Eels between 5 and 10cm long.