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European conger

life science Maturity 5-7 Next article →

The European conger, known scientifically as Conger conger, is a significant marine species. It belongs to the family Congridae. This eel is recognized as the heaviest eel species in the world.

Croncidae - Conger conger
Croncidae - Conger conger

It lives in the northeast Atlantic Ocean and the Mediterranean Sea. You can also find it in the Black Sea. These eels are important for understanding how large eels can grow in weight. While some moray eels may grow longer, they are much more slender. This makes the conger the heaviest eel by mass.

The physical body of a conger is very long and anguilliform, which means it is shaped like an eel. They do not have scales on their skin. Most congers are grey or blackish in color. Their bellies are white, and they have a row of small white spots. These spots align along the lateral line of the body. The head is almost conical and slightly depressed. They have a prominent, rounded snout with lateral olfactory holes. Their large gill openings are located on the sides. Their teeth are conical and arranged in rows on the jaws.

Croncidae - Conger conger
Croncidae - Conger conger

The dorsal and anal fins are confluent with the caudal fin. This means the fins flow together into the tail fin. They also have pectoral fins, but they lack ventral fins.

Conger eels have specific habits for living and hunting. They often reside in holes among rocks, which are sometimes called "eel pits." Interestingly, they sometimes share these holes with moray eels. These eels are nocturnal predators. This means they come out of their holes at night to hunt. They mainly eat fish, crustaceans, and cephalopods. They are also known to scavenge on dead or rotting fish. Because they are predators, they can be aggressive. Large specimens can even pose a danger to human divers.

The growth and size of the European conger vary greatly. An average adult reaches a length of 175 centimeters. Some individuals reach a maximum length of around 275 centimeters. In terms of weight, they average about 25 kilograms. However, they can reach a maximum weight of roughly 100 kilograms. This massive weight is a defining feature of the species. There is also a big difference between the sexes. Females are much larger than males. A female reaches sexual maturity at an average length of 150 centimeters. Males are smaller, reaching maturity at an average length of 75 centimeters.

Croncidae - Conger conger
Croncidae - Conger conger

The life cycle of the conger involves a major physical transformation. This change happens when the eels are between 5 and 15 years old. During this time, their reproductive organs increase in size. At the same time, their skeleton reduces in mass. Their teeth even fall out during this stage. Females tend to increase in size and weight more than males. After these changes, they migrate to spawning areas in the Atlantic or Mediterranean. The exact location of these spawning grounds is still uncertain to scientists.

Reproduction is a final and intense process for the conger. Female conger eels produce several million eggs. Once the spawning is complete, both the males and the females die. After the eggs hatch, the larval conger eels begin a journey. They swim back toward shallower waters. They live in these shallower areas until they reach maturity. Once they are adults, they migrate again to repeat the entire life cycle.

Croncidae - Conger conger
Croncidae - Conger conger

The distribution of the conger is quite wide across the ocean. They can be found in the eastern Atlantic from Iceland and Norway down to Senegal. They inhabit various depths in the sea. They are often found on rough, rocky, or broken ground near the coast when they are young. As adults, they move into deeper waters. They can live at depths of 1,000 meters. They may also reach depths of 2,000 meters during their migrations. However, they are sometimes seen in very shallow water near the shore.

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File:Croncidae - Conger conger.jpg
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