Wiktor Wise
Electric eels are a genus of neotropical freshwater fish from South America. They are known for their ability to stun their prey by generating electricity, delivering shocks of up to 860 volts. Despite their name, electric eels are not closely related to true eels, which mostly live in saltwater. Electric eels are found in the murky waters of the Amazon and Orinoco river basins, as well as in upland waters in the Guiana Shield and Brazilian Shield. They are mostly nocturnal and have poor vision, relying on low-level electrical pulses to navigate and locate prey.
| Characteristics | Values |
|---|---|
| Habitat | Freshwater areas in South America, including the Amazon and Orinoco river basins |
| Water Type | Murky water, pools, ponds, streams, and rivers |
| Diet | Amphibians, fish, crustaceans, crabs, shrimp, and other invertebrates |
| Behavior | Nocturnal, air-breathing, and able to produce electricity to stun prey and defend against predators |
| Lifespan | Average of 12 to 22 years in the wild, with some captive specimens living over 20 years |
| Classification | Electrophorus genus of neotropical freshwater fish in the family Gymnotidae, more closely related to catfish and carp than true eel families |
| Species | E. electricus, E. voltai, and E. varii |
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What You'll Learn
Electric eels are found in freshwaters in South America
Electric eels, despite their name, are not true eels. They are neotropical freshwater fish from South America and are the only members of the subfamily Electrophorinae. They were first described by Carl Linnaeus in 1766 as Gymnotus electricus, based on early field research in South America. They are now classified as Electrophorus electricus, with two additional species identified in 2019: E. voltai and E. varii.
Electric eels are found in the murky waters of the Amazon and Orinoco river basins in South America. They inhabit streams, ponds, and rivers, favouring muddy river bottoms and swamps with deep shade. They are air-breathing animals, so they need to surface frequently to breathe, and they have poor eyesight. To navigate their surroundings and locate prey, they rely on low-level electrical pulses, emitting currents of up to 860 volts to stun or kill their prey.
These eels have long, cylindrical bodies and can grow to enormous sizes, exceeding 8 feet in length and weighing up to 44-45 pounds. They are known for their ability to generate electricity, using it not only to hunt and defend themselves but also to communicate with other individuals in the water. They are top predators in their environment, with no known predators apart from humans.
Electric eels are sexually dimorphic, with males being larger and growing to lengths of over 3 feet, while females reach around 2 feet in length. They work together during the breeding season, with males constructing nests using their saliva and guarding the larvae. Females lay a large number of eggs, ranging from 1,200 to 1,700 during the dry season. The adults provide prolonged parental care for their young, which can last up to four months.
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They are not true eels
Electric eels are found in the muddy waters of the Amazon and Orinoco river basins in South America. They are nocturnal, obligate air-breathing animals with poor vision, which they compensate for by using low-level electrical pulses to navigate and explore their surroundings. They are also known as "electricity bearers", named after the Greek words "ḗlektron" (amber, a substance able to hold static electricity) and "phérō" (I carry).
Despite their name, electric eels are not true eels. They are, in fact, more closely related to carp and catfish. Electric eels are members of the electroreceptive knifefish order Gymnotiformes, while true eels belong to the order Anguilliformes. Electric eels have no dorsal fin and a long, extended anal fin that flutters like a ribbon, allowing them to move forward and backward with ease. They are also air breathers, surfacing about every ten minutes to breathe, unlike true eels, which can breathe underwater with gills.
The electric eel's unique characteristics have long been recognised. The first written mention of the electric eel or puraké ('the one that numbs' in Tupi) was in records by the Jesuit priest Fernão Cardim in 1583. Early experiments on the numbing discharges of electric eels were conducted in the 1760s by naturalists Bertrand Bajon and Ramón M. Termeyer. In 1775, the electric eel's electrical capabilities were studied, which later contributed to the invention of the electric battery in 1800.
In addition to their respiratory and visual differences, electric eels differ from true eels in their reproductive strategies. Electric eels exhibit prolonged parental care, with both males and females working together to protect their brood. The male makes a nest using his saliva, and the female deposits up to 1,700 eggs for fertilisation. After the eggs hatch, the parents die, and the larvae float to the surface of the water. The water current then carries them to new locations, which can take up to 17 months or more.
Electric eels are also distinct from true eels in their ability to produce electricity. They possess three electric organs containing cells called electrocytes, which create an electrical current of up to 600 volts when the eel senses prey or feels threatened. This current is strong enough to stun or kill prey and protect the eel from predators. While electric eels are known for their powerful shocks, it is rare for them to produce a shock with enough voltage to kill a human. However, multiple shocks could lead to respiratory or heart failure.
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They are nocturnal
Electric eels are nocturnal creatures, meaning they are most active at night. They inhabit the murky waters of the Amazon and Orinoco river basins in South America, where they rely on low-level electrical pulses to navigate their surroundings and locate prey. With poor eyesight, their nocturnal behaviour is well-adapted to their environment, enabling them to hunt effectively in low-light conditions.
The ability to generate electricity is a distinct advantage for electric eels when hunting at night. They emit two rapid electric pulses, known as a doublet, which causes the muscles of their prey to twitch involuntarily. This twitching helps the electric eel identify and locate its prey. The eel then releases a series of high-voltage pulses, up to 400 per second, to paralyse and consume its prey.
The nocturnal behaviour of electric eels may also be a strategy to avoid detection by potential threats. During the day, they are more vulnerable to predators as their poor vision can hinder their ability to detect danger. By being active at night, they reduce the risk of visual detection by potential threats in their surroundings.
Additionally, the nocturnal nature of electric eels could be influenced by the feeding habits of their prey. Their diet consists of amphibians, fish, crustaceans, and invertebrates such as crabs and shrimp. These prey species may also be more active during the night, making them more accessible to the electric eels under the cover of darkness.
The combination of their nocturnal behaviour and electrical capabilities makes electric eels highly effective predators in their murky freshwater habitats. Their ability to navigate, locate prey, and hunt successfully in low-light conditions showcases their remarkable adaptations to their environment.
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They are top predators with no known predators
Electric eels are apex predators with no known predators. They are too dangerous for other species to hunt, regardless of water depth. If the water is shallow, large land mammals may attempt to prey on them, but this threat can often be deterred with an electric shock. Electric eels can produce electrical discharges of up to 860 volts, enough to stun or kill prey and protect themselves from predators.
Electric eels are neotropical freshwater fish native to South America, particularly the Guiana Shield, the Brazilian Shield, and the lowland regions. They favour muddy river bottoms and swamps with deep shade, and can tolerate low-oxygen water by swimming to the surface to breathe air. They are mostly nocturnal, hunting with electric currents along their undersides. Their diet includes amphibians, fish, and crustaceans, with a preference for crabs and shrimp.
The absence of natural predators for electric eels raises questions about what regulates their population. Similar to other apex predators, their population growth is limited by the availability of food and suitable habitats. While humans fish for electric eels, it is not a common practice due to the danger they pose and the boniness of their bodies.
Electric eels have unique characteristics that make them distinct from true eels. They are members of the electroreceptive knifefish order Gymnotiformes, which is more closely related to catfish. Electric eels have poor vision and use low-level electrical pulses to navigate their surroundings. Their vital organs are concentrated in one-fifth of their body, located directly behind their heads.
In summary, electric eels are apex predators with no known predators due to their ability to deliver powerful electric shocks. Their population growth is naturally limited by food availability and habitat, and they play a significant role in the ecosystems of South American freshwater environments.
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They are long-living, with some living for over 20 years
Electric eels are native to South America, where they inhabit the murky waters of the Amazon and Orinoco river basins. They are air-breathing animals, which means they need to surface frequently to breathe. They are also nocturnal and have poor eyesight. Despite their name, electric eels are not true eels but are actually members of the electroreceptive knifefish order Gymnotiformes, which is more closely related to carp and catfish.
Electric eels are top predators with no known predators besides humans. They can grow to enormous sizes, exceeding 8 feet in length and weighing up to 44-45 pounds. They feed on a variety of prey, including fish, amphibians, crustaceans, and even birds and small mammals. Electric eels use their electrical abilities not only to hunt and defend themselves but also to navigate their surroundings and communicate with other individuals.
The breeding process of electric eels is still not well understood by scientists. However, it is known that male and female eels work together during the breeding season. Males construct nests using their saliva, and females deposit a large number of eggs for fertilisation. The adults provide prolonged parental care for their offspring, which can last up to four months.
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Frequently asked questions
Electric eels are freshwater fish that live in the murky waters of the Amazon and Orinoco river basins in South America.
Electric eels are known for their ability to generate electricity. They use this electricity to stun their prey, defend themselves, navigate through the water, and communicate with other eels.
The diet of an electric eel changes as it grows. Young eels eat crabs, shrimp, and other invertebrates, while adult eels eat amphibians, fish, and crustaceans.
Electric eels have no known predators in the wild, likely due to their dangerous electric shocks. However, they are sometimes fished and eaten by humans.
The average lifespan of an electric eel in the wild is unknown. In captivity, males typically live for 10 to 15 years, while females generally live for 12 to 22 years.
