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Science & Nature • Ichthyology

Electric eel

The electric eel is a group of South American freshwater knifefishes in the genus Electrophorus, known for producing powerful electric discharges.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

The electric eel is a group of South American freshwater knifefishes in the genus Electrophorus, known for producing powerful electric discharges. Despite the name, they are not true eels and are more closely related to catfish and carp. They live mainly in the Amazon and Orinoco basins and use electricity for hunting, navigation, and defense.

Taxonomy

Electric eels belong to the genus Electrophorus and are not members of the true eel group. They are knifefishes, more closely related to catfish and carp than to eel species.

Electric organs and shock production

Electric eels have specialized electric organs made of electrocytes that generate discharges. These electrical signals are used for hunting, defense, and navigation in low-visibility water.

Habitat and distribution

They inhabit muddy freshwater environments in northern South America, especially the Amazon and Orinoco river basins. Their habitat preference reflects their reliance on electricity rather than sight.

Species and conservation

Modern sources recognize three electric eel species within Electrophorus. The group is generally considered of Least Concern, with populations described as stable in major reference sources.

Key facts

  • Electric eels are not true eels; they are knifefishes in the order Gymnotiformes.
  • They can generate high-voltage electric shocks to stun prey and deter predators.
  • They also use low-voltage electrical signals to navigate and detect objects in murky water.
  • They are found in freshwater habitats of the Amazon and Orinoco basins in South America.
  • The genus Electrophorus contains three recognized species.
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Canadian context

Electric eels are commonly featured in Canadian zoo and aquarium education programs, helping Canadian readers learn about South American freshwater biodiversity and animal electrophysiology.

Frequently asked questions

Are electric eels really eels?
No. Electric eels are knifefishes in the order Gymnotiformes, not true eels.
How strong is an electric eel’s shock?
Sources report shocks of roughly 600 to 800 volts, depending on the species and source.
Where do electric eels live?
They live in freshwater habitats of South America, mainly in the Amazon and Orinoco basins.
How do electric eels use electricity?
They use low-voltage signals to sense their surroundings and high-voltage discharges to stun prey and defend themselves.
How many species of electric eel are there?
Three species are currently recognized in the genus Electrophorus.

References

  1. Smithsonian's National Zoohttps://nationalzoo.si.edu/animals/electric-eel
    Supports: Not a true eel; knifefish relationship; up to 800 volts; conservation status
  2. National Geographichttps://www.nationalgeographic.com/animals/fish/facts/electric-eel
    Supports: Not a true eel; habitat; voltage range; life span; electric sensing behavior
  3. Encyclopaedia Britannicahttps://www.britannica.com/animal/Electrophorus-fish-genus
    Supports: Genus Electrophorus; three species; Amazon tributaries
  4. Natural History Museumhttps://www.nhm.ac.uk/discover/how-do-electric-eels-work.html
    Supports: Classification as knifefishes; relation to catfish and carp; electric use for defense, hunting, navigation
  5. Shedd Aquariumhttps://www.sheddaquarium.org/animals/electric-eels
    Supports: Three species; knifefish family; relation to catfish and carp
  6. American Museum of Natural Historyhttps://www.amnh.org/explore/ology/ology-cards/121-electric-eel
    Supports: Habitat; size; diet; use of electric charges in murky water
  7. IUCN Red Listhttps://www.iucnredlist.org
    Supports: Conservation status Least Concern