Fish
Conger Eel
Conger conger · also called congers
By day a conger eel stays coiled out of sight inside a rocky crevice or the hull of an old wreck, easy to miss entirely. After dark it emerges to hunt, and given enough years, it grows into one of the largest true eels in the ocean, patient for most of its life and capable of a genuinely powerful bite if that patience runs out.
Overview
The conger eel, Conger conger, is a large, nocturnal predator native to rocky coastal waters of the eastern Atlantic and Mediterranean. It shelters by day in reefs and wrecks, emerging at night to hunt fish, crustaceans, and cephalopods.
One long journey, one chance to breed
Rather than breeding repeatedly across its life, a conger eel saves everything for a single deep-ocean spawning migration at the very end, a one-shot reproductive strategy shared with a handful of other eel species that closes out a long, mostly hidden life.
Status
Least Concern — widespread and stable across suitable rocky coastal habitat throughout the eastern Atlantic and Mediterranean.
Conger Eel: common questions
How big can a conger eel actually get?
The conger eel can grow to a considerable length and weight, making it one of the largest species within the true eel order, substantially larger than many more familiar freshwater eel species, a size that has made it a genuinely popular target for recreational sport anglers in parts of Europe.
Is a conger eel dangerous to humans?
A conger eel is not generally aggressive toward humans without provocation, but it is capable of delivering a powerful, hard bite if threatened, cornered, or handled carelessly, so anglers and divers are generally advised to exercise caution and proper handling technique when encountering one.
Does a conger eel breed more than once in its life?
No, a conger eel undertakes a single, long migration to deep ocean spawning grounds at the very end of its life and breeds only once before dying, a reproductive strategy called semelparity that is shared with several other eel species rather than the repeated annual breeding seen in many other fish.
When is the best time to see a conger eel?
A conger eel typically spends daylight hours hidden within rocky crevices, reefs, or shipwrecks, emerging mainly at night to actively hunt, so divers and anglers are considerably more likely to encounter an active conger eel after dark than during a typical daytime dive or fishing trip.