Fish Active at night

European Conger

Conger conger

iNaturalist Wikipedia

The European Conger is the undisputed heavyweight of the eel world, a muscular nocturnal predator that haunts the shipwrecks and rocky reefs of the Northeast Atlantic. Growing up to three meters in length, these 'serpents of the sea' are as mysterious as they are massive.

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Quick Identification

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Size

Length up to 3 m (9.8 ft); weight up to 110 kg (242 lb)

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Colors

Greyish to blackish-grey dorsal side with a paler, whitish or silvery underside; fins often edged with a distinct black border

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Key Features

Extremely long, scaleless cylindrical body
Large head with a wide mouth and powerful jaws
Dorsal fin begins directly above or just behind the pectoral fins
Upper jaw is longer than the lower jaw

When You’ll See Them

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Activity pattern Active at night

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Peak hours 10 PM - 4 AM

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Season Year-round

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Diet A dominant carnivore that eats fish (such as pollack and cod), crustaceans (crabs and lobsters), and cephalopods (squid and octopus) using a powerful 'death roll' to tear prey.

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Habitat Coastal waters with rocky substrates, shipwrecks, piers, and deep crevices reaching depths of over 1,000 metres.

Behavior

The European Conger is a formidable, solitary predator that spends most of its daylight hours hidden within the safety of rocky crevices, underwater caves, or shipwrecks. As a nocturnal hunter, it emerges under the cover of darkness to prowl the seabed. Despite their fearsome reputation and impressive size, they are generally shy around humans unless provoked or cornered, though they are known to be extremely powerful and determined when hunting.

These eels have a fascinating life cycle characterized by a single, massive migration. After living for 5 to 15 years in coastal waters, adults undergo physiological changes and travel thousands of miles to deep-water spawning grounds in the Atlantic or Mediterranean. Once they spawn, having expended all their energy and ceased feeding, they die, leaving their transparent, leaf-like larvae (leptocephali) to drift back toward the coast on ocean currents.

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Camera Tips

To capture the elusive European Conger, you will need a specialized underwater camera setup or a high-quality action camera in a waterproof housing rated for significant depth. Since these eels are strictly nocturnal, your camera must have infrared or red-light capabilities; bright white lights often startle them and cause them to retreat immediately into their holes. Position your camera on a weighted tripod or secure it directly to a rocky ledge or pier piling about 1 to 2 feet off the seabed, facing a known crevice or 'hole' where an eel might reside.

Baiting is the most effective way to draw a Conger into your camera's field of view. Use a mesh bait bag filled with highly aromatic, oily fish like mackerel, herring, or squid. Secure the bait bag firmly to a heavy object or the camera mount itself, as a large Conger possesses immense strength and can easily swim off with unsecured bait—potentially taking your camera with it. Set your camera to record in high-frame-rate video bursts, as their strikes are lightning-fast despite their bulky size.

Placement is key: for those with coastal 'backyards,' look for areas near private jetties, sea walls, or rocky shorelines during high tide. The best time to capture activity is during the two hours surrounding high tide at night, especially during the darker phases of the moon. Ensure your housing is cleaned of salt and algae regularly to maintain clarity, and always use a safety tether to prevent your gear from being dragged into a deep, inaccessible crevice by a curious giant.

Similar Species

Species that look similar or are commonly confused with European Conger.

European Eel

Much smaller (usually under 1m) and the dorsal fin starts much further back along the body.

Mediterranean Moray

Features a mottled, 'marbled' color pattern and lacks pectoral fins, which the Conger possesses.

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Frequently Asked Questions

European Conger are strictly nocturnal, meaning they are most active during the middle of the night. They typically emerge from their rocky dens shortly after sunset to hunt and return before dawn.

The best way to attract them is by using high-scent baits like oily mackerel, squid, or crushed crabs placed in a mesh bag near a known rocky crevice. Ensure the bait is secured tightly as they are incredibly strong.

They are opportunistic carnivores that feed on a variety of marine life, including smaller fish like pouting and poor cod, as well as crabs, lobsters, and octopuses.

While not 'suburban' in the terrestrial sense, they are very common near man-made structures in coastal towns, such as harbor walls, piers, and breakwaters, which provide the crevices they need for shelter.

The European Conger is much larger and lacks scales entirely. Additionally, its dorsal fin begins much further forward (near the pectoral fins) compared to the common European Eel, whose dorsal fin starts much further down the back.

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