European Conger

Fascinating facts about the European Conger

• At up to 3 m (9.8 ft) long and roughly 72 kg (159 lb) – with some reports as heavy as 160 kg (350 lb) – the European conger is the heaviest eel on Earth, showing how weight, not just length, defines the top spot among eels.
• A typical catch ranges from just 2.5 kg (5.5 lb) up to 25 kg (55.1 lb), yet females need to hit about 2 m (6 ft 7 in) to become sexually mature, while males mature at only 1.2 m (3 ft 11 in), highlighting a striking size gap between the sexes.
• These eels can be found from shallow coastal rocks to depths of 3,600 m (11,800 ft), and are also present at depths of 0–500 m (0–1,640 ft).
• Between ages 5 and 15, congers undergo a dramatic makeover: their skeleton lightens, teeth fall out, and reproductive organs swell, a transformation that prepares them for a one-time, fatal spawning journey.
• A single female can release several million eggs before dying, and the tiny larvae must swim back to shallower waters to grow, a life-cycle that links the deepest ocean layers to coastal habitats.

At a glance

About the European Conger

The European conger, Conger conger, is the heavyweight champion of eels, with most adults measuring about 1.5 m (5 ft) and the largest individuals reaching roughly 3 m (9.8 ft) and weighing up to 72 kg (159 lb), possibly even 160 kg (350 lb). Its long, scaleless, anguilliform body is a muted grey, sometimes blackish, with a white belly and a distinctive line of tiny white spots along the lateral line. The head is almost conical and slightly depressed, sporting a rounded snout, prominent lateral olfactory holes, and rows of conical teeth. Dorsal and anal fins merge seamlessly with the caudal fin, while pectoral fins are present and ventral fins are absent. Females mature at about 2 m (6 ft 7 in), far larger than the 1.2 m (3 ft 11 in) males, and both sexes undergo a dramatic transformation at ages 5-15, shedding teeth and lightening their skeletons before the final spawning migration. These nocturnal predators hide in rocky crevices or “eel pits,” sometimes sharing holes with morays, and emerge under cover of darkness to hunt fish, cephalopods, and crustaceans, even scavenging on carrion. Their range spans the eastern Atlantic from Norway and Iceland to Senegal, the Mediterranean, and the Black Sea, occupying depths from shallow coastal waters to 3,600 m (11,800 ft) during migrations. A surprising trait is their ability to migrate thousands of kilometres to uncertain spawning grounds, after which both males and females die, leaving the next generation to drift as larvae back toward the shallower nursery habitats, ready to repeat the cycle

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