This is a big eel. 
This eel is very heavy. 
The European conger is a very big eel. 
Congers like to hide in rocky holes. They are nocturnal, which means they hunt at night. They eat fish and crabs. They also eat dead fish.
When eels grow up, their bodies change. Their teeth fall out. Their bones also get smaller. This happens so they can make babies. Females grow much larger than males. They lay millions of eggs. After they lay eggs, the eels die. The tiny babies swim to shallow water. They grow up and start the cycle again. Young eels live near the coast. Adults move to deeper water. They can live very deep in the sea.
The European conger is a very special fish. It belongs to the family Congridae. This eel is the heaviest eel in the world. It lives in the northeast Atlantic Ocean. You can also find it in the Mediterranean Sea. It lives in the Black Sea too. These eels are very important to study. They show us how big an eel can grow.
This eel has a very long body. It does not have any scales. Most congers are grey or blackish. Their bellies are white. You might see small white spots on their sides. These spots follow a line on their body. They have a round snout and big gill openings. They use their teeth to eat. Their teeth are shaped like cones.
Congers have a busy way of life. They like to hide in rocky holes. Some people call these holes eel pits. They often come out at night to hunt. This means they are nocturnal. They eat fish and crabs. They also eat things like cephalopods. Sometimes they eat dead or rotting fish. They can even be aggressive to divers.
These eels grow to amazing sizes. An average adult is about 175 centimeters long. Some can reach 275 centimeters. They can weigh about 25 kilograms. Some might even reach 100 kilograms. This makes them the heaviest eels. Females are much larger than males. A female might be 150 centimeters at maturity. A male might only be 75 centimeters.
When eels get older, their bodies change. This happens between 5 and 15 years old. Their reproductive organs grow much larger. Their bones actually lose mass. Even their teeth fall out. Then they swim to spawning areas. Females lay millions of eggs. Both parents die after they spawn. The tiny babies swim to shallow water. They grow up and start the cycle again.
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. 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. 
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.

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.

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