European Eel Identification Guide

Key identification features

• Elongated, cylindrical, snake-like body that tapers gently toward a fully finned tail
• Small pointed head with a slightly undershot lower jaw and small, forward-set eyes
• One continuous fin runs from the mid-back around the tail to the vent, with the dorsal fin starting notably behind the pectoral fins
• Skin appears smooth and scaleless, though tiny embedded scales are present
• Coloring changes with maturity: yellowish-brown "yellow eel" phase in freshwater, transitioning to a silvery, dark-backed "silver eel" phase before its spawning migration

Common look-alikes

• American eel: virtually identical in shape and color; range is the key separator, as European eel is found in Europe, the Mediterranean, and North Africa while American eel occupies the Western Atlantic
• Conger eel: bulkier and more muscular, with a dorsal fin starting much closer to the head and no small embedded scales, unlike the slimmer European eel
• Snake eels: end in a stiff, pointed, finless tail tip used for burrowing, whereas European eel's tail carries a continuous fin margin

Where you'll see one

European eel is catadromous, living in rivers, lakes, and estuaries across Europe, the Mediterranean basin, and North Africa, before making a long migration across the Atlantic to spawn in the Sargasso Sea.