European Conger

Overview

The European conger is a large, powerful marine eel known for its snake-like appearance and nocturnal habits. It is a widespread predator that inhabits rocky and sandy environments, often seeking shelter in crevices, wrecks, or artificial structures during the day.

Distribution & habitat

This species is found throughout the northeastern Atlantic, ranging from Norway and Iceland down to Senegal, as well as in the Mediterranean and Black Seas. While juveniles often stay in shallower coastal waters, adults typically move to deeper environments, with the species found from the shoreline down to depths of over 1,000 meters.

Appearance

Conger eels have a long, cylindrical, and scaleless body that is typically slate-blue, grey, or blackish, with a lighter, often white or pale golden, underside. Their dorsal, tail, and anal fins are fused into a continuous fringe around the body, and they possess a large head with a wide mouth, thick lips, and strong teeth. Two tube-like nostrils are clearly visible on the tip of the snout.

Biology & behavior

Primarily nocturnal, these eels remain hidden in holes or rocky crevices during the day, often leaving only their heads visible. They are solitary and can be territorial, sometimes engaging in aggressive encounters with other eels. As a semelparous species, they reproduce only once in their lifetime; upon reaching maturity, they migrate to deep offshore waters to spawn before dying.

Feeding

As opportunistic carnivores, they emerge at night to hunt. Their diet consists of a wide variety of prey, including fish, crustaceans, and cephalopods like octopuses.