Electric eel

The electric eel is a fish.

It lives in South America. It can give a big shock. This helps it catch food.

These fish can breathe air. They swim to the top to get it. They mostly come out at night. The males are bigger than the females. They keep growing as they live.

It is a very amazing fish.

The electric eel is a special fish from South America.

Even though they have "eel" in their name, they are not true eels. They are actually knifefish. They are related to catfish.

These fish use electricity to survive. They have three electric organs. These organs are made of cells called electrocytes. These cells are like tiny batteries. The eel stacks many electrocytes in a row to make a big shock. One species can make a shock of 860 volts! This helps them stun prey like other fish.

Electric eels have poor vision. To find things, they use electrolocation. This is a way to sense things using electricity. They have small pits on their skin to help.

They also breathe air. They swim to the surface to get oxygen. They mostly come out at night. Males grow larger than females. They also grow more bones as they live.

The electric eel is a fascinating fish from South America.

Even though they have "eel" in their name, they are not true eels. They belong to a group called knifefish. They are actually more closely related to catfish. These animals live in muddy river bottoms and dark swamps. They mostly come out at night to hunt for food. They can even live in water with very little oxygen. This is because they swim to the surface to breathe air.

These fish use electricity to find food and protect themselves. They have three special electric organs in their bodies. These organs are made of tiny cells called electrocytes. You can think of these cells like small batteries. To make a big shock, the eel stacks about 6,000 electrocytes in a long row.

This stacking helps them create a very high voltage. One species can reach 860 volts! This strong shock helps them stun prey like other fish.

Scientists have studied these amazing fish for a long time. Carl Linnaeus first described them in 1766. He noted they lived in the rivers of Surinam. Later, in 1864, Theodore Gill gave them their own name, Electrophorus. This name means "electricity bearer" in Greek. Studying these fish even helped humans invent the electric battery in 1800.

For a long time, people thought there was only one species. However, in 2019, scientists found there are actually three different species. These are E. electricus, E. voltai, and E. varii.

Each species has its own special traits and homes. The species E. voltai is the strongest electricity maker in nature. It lives in southern areas like the Brazilian shield. E. electricus lives further north in the Guiana Shield. The third species, E. varii, lives in the central lowlands. These fish have very long bodies with many bones. They can have as many as 300 vertebrae in their spines.

Males in these groups usually grow larger than the females.

Electric eels use their senses in a very clever way. They have small eyes and cannot see very well. Instead, they use electrolocation to find things in the dark.

They have tiny pits on their skin called electroreceptors. These help them sense the electricity of other living things. They also use a special system of bones to hear. This helps them stay aware of their surroundings in the water. It is a wonderful way to live in a dark, muddy home.

Electric eels are a genus of neotropical freshwater fish found in South America. They belong to the family Gymnotidae and the subfamily Electrophorinae.

Despite their common name, they are not true eels from the order Anguilliformes. Instead, they are members of the knifefish order Gymnotiformes. This group is actually more closely related to catfish than to true eels. These fish are famous for their ability to generate powerful electrical shocks. They use this electricity to stun prey and navigate their dark environments.

To create electricity, the eel uses three specialized electric organs. These are arranged longitudinally along its body. They are called the main organ, Hunter's organ, and Sachs' organ. These organs are made of modified muscle cells known as electrocytes. To produce a high-voltage shock, the eel stacks approximately 6,000 electrocytes in a series. This means they are lined up one after another in long columns. The main organ contains about 35 of these stacks in parallel on each side of the body. This arrangement allows the eel to reach very high voltages. Because freshwater has high electrical resistance, the eel must produce high voltage to deliver a strong shock.

There are three distinct species within the genus Electrophorus. For a long time, scientists believed the genus was monotypic, meaning it had only one species. However, research in 2019 divided the group into three species based on DNA and anatomy. The first is Electrophorus electricus, which has a U-shaped head and a flattened skull. The second is Electrophorus voltai, which has an egg-shaped head. This species is the strongest bioelectricity generator in nature, capable of reaching 860 volts. The third is Electrophorus varii, which has a thicker skull and a more variable head shape. These species live in different parts of northern South America. E. electricus lives in the Guiana Shield, E. voltai lives in the Brazilian shield, and E. varii lives in the central lowlands.

Humans have been studying these fish for centuries. Carl Linnaeus first described the fish in 1766. He originally named it Gymnotus electricus after studying specimens from Surinam. In 1864, Theodore Gill moved the fish to its own genus, Electrophorus. This name comes from Greek words meaning "electricity bearer." In 1872, Gill also established the family Electrophoridae. The study of these fish has had a major impact on human technology. Research into their electrical capabilities in 1775 contributed to the invention of the electric battery in 1800.

Electric eels possess unique biological features that help them survive. They are nocturnal animals that live on muddy river bottoms or in swamps. They are obligate air-breathers, which means they must breathe air to survive. They use a process called buccal pumping to take in air. They hold the air in a buccal cavity lined with a frilled mucosa. This specialized tissue allows for gas exchange between the air and the blood. This ability lets them live in water that has very low oxygen levels.

Their bodies are also quite unique, containing as many as 300 vertebrae. This is much more than other knifefish, which may have only 51.

Because they have poor vision, electric eels rely on other senses to hunt. They use electrolocation to find prey in dark or murky water.

Tiny pits on their head and body contain electroreceptors. These receptors detect electrical signals from other living things. They also have a mechanosensory lateral line to sense water movements. To hear, they use a Weberian apparatus. This is a system of tiny bones that connects the inner ear to the swim bladder. These combined senses allow them to hunt fish and other animals effectively in total darkness.

These fish play a specific role in their ecosystem. E. voltai often hunts in packs to target schools of fish. They have been observed herding tetras and launching joint strikes.

Other species, like E. varii, prey on armored catfishes and cichlids. Their biological complexity connects to many fields of study. Their electrocytes provide insight into cell biology and protein functions. Their ability to generate electricity is a key example of extreme evolutionary adaptation. This makes the electric eel a vital subject for understanding how animals interact with their physical environment.