The European conger (Conger conger) is a species of conger of the family Congridae. It is the heaviest eel in the world and native to the northeast Atlantic, including the Mediterranean Sea. European congers have an average adult length of 1.5 m (5 ft), a maximum known length of around 2.133 m (7 ft) (possibly up to 3 metres (9.8 ft) for the largests specimens), and maximum weight of roughly 72 kg (159 lb), making them the largest eels in the world by weight. They can be rivaled or marginally exceeded in length by the largest species of moray eel but these tend to be slenderer and thus weigh less than the larger congers. Average specimens caught will weigh only 2.5 to 25 kg (5.5 to 55.1 lb). Females, with an average length at sexual maturity of 2 m (6 ft 7 in), are much larger than males, with an average length at sexual maturity of 1.2 m (3 ft 11 in). The body is very long, anguilliform, without scales. The color is usually grey, but can also be blackish. The belly is white. A row of small white spots is aligned along the lateral line. The head is almost conical and slightly depressed. The snout is rounded and prominent, with lateral olfactory holes. The large gill openings are in the lateral position. The conical teeth are arranged in rows on the jaws. The dorsal and anal fins are confluent with the caudal fin. Pectoral fins are present, while ventral fins are absent. Conger conger and a Mediterranean moray eel in one hole, at the Protected Marine Area of Portofino Conger eels have habits similar to moray eels. They usually live amongst rocks in holes, or \\\\\\\\\\\\\\\"eel pits\\\\\\\\\\\\\\\", sometimes in one hole together with moray eels. They come out from their holes at night to hunt. These nocturnal predators mainly feed on fish, cephalopods, and crustaceans, although they are thought to scavenge on dead and rotting fish, as well as actively hunt live fish. Congers can be aggressive to humans, and large specimens can pose a danger to divers. Distribution This species can be found in the eastern Atlantic from Norway and Iceland to Senegal, and also in the Mediterranean and Black Sea at 0–500 m of depth, although they may reach depths of 3600 m during their migrations. It is sometimes seen in very shallow water by the shore, but can also go down to 1,170 m (3,840 ft). It is usually present on rough, rocky, broken ground, close to the coast when young, moving to deeper waters when adult. Migration and reproduction When conger eels are between 5 and 15 years old, their bodies undergo a transformation, with the reproductive organs of both males and females increasing in size and the skeleton reducing in mass and the teeth falling out. Female conger eels appear to increase in weight and size more than males. Conger eels then make migrations to spawning areas in the Mediterranean and the Atlantic, \\\\\\\\\\\\\\\"although the existence of one or multiple spawning grounds for the species remains uncertain\\\\\\\\\\\\\\\". The female conger eels produce several million eggs, and both the females and males die after spawning. Once hatched, the larval conger eels begin to swim back to shallower waters, where they live until they reach maturity. They then migrate to repeat the cycle.
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