Beatrice Lang
Electric eels are a genus of neotropical freshwater fish from South America. They are known for their ability to stun prey and deter predators by generating electricity. These electric shocks can measure up to 860 volts. Electric eels are mostly found in the muddy waters of the Amazon and Orinoco basins, where they feed on fish, amphibians, birds, and small mammals. They are nocturnal, obligate air-breathing animals with poor vision, favouring dark and murky waters. This preference for specific water conditions raises the question: what temperature do electric eels find most habitable?
| Characteristics | Values |
|---|---|
| Habitat | Calm stretches of the middle and lower Amazon and Orinoco river basins in South America |
| Water Type | Freshwater |
| Water Temperature | Not mentioned |
| Water Oxygen Level | Low |
| Water Depth | Deep enough to allow the eel to surface and breathe |
| Water Flow | Fast-flowing rivers, streams, and ponds |
| Water Clarity | Murky, muddy, and dark |
| Water pH | Not mentioned |
| Water Salinity | Not mentioned |
| Surrounding Landscape | Grassland, ravines, and swamps |
| Weather Conditions | Dry and wet seasons |
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What You'll Learn
Electric eels live in muddy waters
Electric eels, despite their name, are not true eels. They are neotropical freshwater fish from South America and are more closely related to carp and catfish. They can grow to more than 2.5 metres in length and weigh up to 22 kilograms. They have poor eyesight and are mostly blind, relying on low-level electrical pulses to navigate and explore their surroundings.
Electric eels are nocturnal and are known for their ability to stun their prey by generating electricity. They can deliver shocks of up to 860 volts, which is more than five times the power of a standard US wall socket. They use weaker electric impulses to navigate, hunt and communicate. The electricity is produced by three specialised organs: the main electrical organ, the Hunter's organ, and the Sachs' organ. These organs make up about 80% of the fish's body.
The name "electric eel" comes from its shocking abilities. They were first studied in 1775, and this research contributed to the invention of the electric battery in 1800. Electric eels are listed as a species of least concern by the IUCN Red List as of 2009.
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They are found in the Amazon and Orinoco basins
Electric eels are found in the Amazon and Orinoco basins in South America. They are neotropical freshwater fish and are known for their ability to stun prey by generating electricity. They can discharge up to 860 volts of electricity, over five times the power of a standard US wall socket.
The basins are muddy, dark, and calm, and the waters are low in oxygen. The eels swim to the surface to breathe air about every 10 minutes. They are mostly nocturnal and have poor eyesight. They emit a weak electric signal to navigate, find a mate, and find prey. Once prey is found, they use a much stronger shock to stun it, usually smaller fish.
The average lifespan of electric eels in the wild is unknown. In human care, males typically live for 10 to 15 years, while females generally live for 12 to 22 years. Some captive specimens have lived for over 20 years. Electric eels can grow to more than 2.5 metres in length and weigh up to 22 kilograms.
The electric eel was first described by Carl Linnaeus in 1766, based on early field research in South America. He noted that the fish is from the rivers of Surinam and can cause painful shocks. In 1864, Theodore Gill moved the electric eel to its own genus, Electrophorus. The name comes from the Greek words "ḗlektron" (amber, a substance that can hold static electricity) and "phérō" (I carry), meaning "electricity bearer".
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The eels are nocturnal
Electric eels are nocturnal. They live in muddy, dark waters, and have poor eyesight. Instead of relying on their eyes, they emit a weak electric signal to navigate, find a mate, and locate prey. They use a much stronger shock to stun their prey, usually smaller fish.
Electric eels are obligate air-breathing animals, meaning they need to surface about every ten minutes to breathe. This is because they lack gills, unlike true eels, and cannot absorb oxygen from the water. Their ability to breathe air enables them to survive in waters with very low oxygen levels. They can be found in the calm waters of the middle and lower Amazon and Orinoco river basins in South America.
Electric eels are neotropical freshwater fish and are the only members of the subfamily Electrophorinae within the family Gymnotidae. They are not considered "true" eels and are more closely related to carp and catfish. They can grow to more than 2.5 metres in length and weigh up to 22 kilograms.
Electric eels have three specialised electric organs: the main electrical organ, the Hunter's organ, and the Sachs' organ. These organs make up about 80% of the eel's body. The electric organs create both strong and weak electric charges, which are used for defence, hunting, communication, and navigation. The strong electric pulses are produced by the main electrical organ and two-thirds of the Hunter's organ. The remaining one-third of the Hunter's organ and the Sachs' organ produce the weaker electric discharges.
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They can tolerate low-oxygen waters
Electric eels are obligate air-breathing animals, meaning they need to surface every 10 minutes to breathe air as they are unable to absorb oxygen from the water through their gills like most fish. This makes them well-suited to low-oxygen waters, where other fish cannot survive. They are found in the muddy waters of the middle and lower Amazon and Orinoco river basins in South America.
The eels live in varied environments, from streams and grassland ponds to swamps and ravines, and they can tolerate large changes in water levels between the wet and dry seasons. During the dry season, water levels in their muddy ponds and pools can get extremely low, leaving them more vulnerable to predators. This is when their electric shock abilities are particularly valuable, helping to deter predators such as jaguars and caiman.
Electric eels are mostly nocturnal and have poor vision. They emit a weak electric signal, which they use to navigate, find a mate, and locate prey. Once prey is found, they use a much stronger shock to stun it. They can produce electrical discharges of up to 860 volts, with some sources placing this figure at 800 volts or 600 volts.
The electric eel's ability to tolerate low-oxygen waters is due to its air-breathing nature, which allows it to surface and breathe air directly. This adaptation enables it to survive in environments where oxygen levels in the water are insufficient for other fish, giving it an advantage in these habitats.
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They are not closely related to true eels
Electric eels are not closely related to true eels. In fact, they are more closely related to carp and catfish. They are a type of knifefish, belonging to the order Gymnotiformes, while true eels belong to the order Anguilliformes. Electric eels were first described by Carl Linnaeus in 1766 as Gymnotus electricus, placing them in the same genus as the banded knifefish, Gymnotus carapo. However, in 1864, Theodore Gill moved the electric eel to its own genus, Electrophorus, recognising its distinct characteristics.
The electric eel's scientific name, Electrophorus, is derived from the Greek words "ḗlektron," meaning "amber," which can hold static electricity, and "phérō," meaning "I carry", thus giving the meaning "electricity bearer." This name reflects the electric eel's unique ability to generate electricity. They possess three specialised electric organs—the main organ, the Hunter's organ, and the Sachs' organ—which make up about 80% of their body. These organs enable them to produce electric impulses of varying strengths, which they use for defence, stunning prey, communication, and navigation.
The distinction between electric eels and true eels is not just taxonomic but also ecological. Electric eels are found in freshwaters in South America, particularly in the Amazon and Orinoco rivers, while true eels mostly inhabit salt water. Electric eels are air-breathing fish, surfacing to breathe air about every 10 minutes, which allows them to survive in low-oxygen waters. This adaptation makes them well-suited for habitats with varying oxygen levels, such as streams, swamps, and pools.
In terms of appearance, electric eels have a long, cylindrical body with a flattened head and can grow to more than 2.5 metres in length and weigh up to 22 kilograms. They lack pelvic fins and have a reduced caudal fin and no dorsal fins. Instead, they possess an elongated anal fin that enables them to manoeuvre through the water with agility, swimming forward, backward, and even hovering.
While they are commonly called eels due to their eel-shaped body, electric eels are indeed a distinct group of fish with unique characteristics and adaptations that set them apart from true eels. Their ability to generate electricity and their specific ecological preferences further emphasise their distant relationship with true eels.
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Frequently asked questions
The temperature of the water electric eels live in is not documented. However, they are native to the Amazon and Orinoco basins of South America and live in muddy waters.
Electric eels are found in the calm stretches of the middle and lower Amazon and Orinoco basins in South America.
Electric eels live in muddy waters with low oxygen levels. They are found in streams, ponds, pools, and rivers.
Yes, during the dry season, water levels in the muddy ponds and pools can get extremely low, leaving the fish more vulnerable to predators.
The average lifespan of electric eels in the wild is unknown. In human care, males typically live for 10 to 15 years, while females generally live for 12 to 22 years. Some captive specimens have lived for over 20 years.
