Head to head
Black Ghost Knifefish vs Electric Eel
The black ghost knifefish and the electric eel both generate their own electric fields and share South American freshwater habitat, and despite the enormous difference in the strength of their electricity, both belong to the same broader group of electric fish.
| Black Ghost Knifefish | Electric Eel | |
|---|---|---|
| Scientific name | Apteronotus albifrons | Electrophorus electricus |
| Electric field strength | Weak, for sensing and navigation | Up to 860 volts, the strongest of any animal |
| Purpose of electricity | Navigation and prey detection | Navigation, stunning prey, and defence |
| Body shape | Tapers to a point, no tail fin | Long and eel-like, with a single long underside fin |
| Size | Smaller | Up to 2.5 m and 20 kg |
| True identity | A knifefish | Also a knifefish, not a true eel |
| Diet | Carnivore | Carnivore |
| Habitat | South American rivers and flooded forest | South American rivers and flooded forest |
Black Ghost Knifefish vs Electric Eel: common questions
Are the black ghost knifefish and electric eel related?
Yes, both belong to the broader order of South American electric fish known as Gymnotiformes, and neither is a true eel despite the electric eel's common name.
Which of these two fish can deliver a dangerous shock?
The electric eel, whose discharge can reach up to 860 volts, strong enough to stun prey or deter a large animal, while the black ghost knifefish's electric field is far too weak to cause any harm and is used only for sensing its surroundings.
Why does the black ghost knifefish's electric field differ so much from the electric eel's?
The black ghost knifefish uses its weak electric field purely for navigation and detecting prey in the dark, while the electric eel has evolved a vastly more powerful discharge capable of stunning prey outright and defending itself against serious threats.