Electric Eel Communal Hunting — Venezuela Amazon
The electric eel's communal hunting behaviour — described in a 2021 Nature paper by Dr Douglas Bastos — was documented in the Iriri River of Pará state, where groups of up to 100 electric eels coordinate to herd schooling fish into tight balls at the water surface, then discharge simultaneously in coordinated pulses to stun the prey. Individual electric eels produce up to 860 volts; a simultaneous discharge from 100 eels creates an electrical event in the water sufficient to stun fish at the surface and render them temporarily paralysed. The behaviour — the first documented coordinated social hunting in electric fish — is visible from canoe when eels are active at dawn in river margins, and the sight of multiple large (1.5-metre) eels simultaneously breaching the surface while fish jump clear of the discharge creates one of the Amazon's most dramatically unexpected wildlife encounters.
About this spectacle
At first light on the slow river margins of the Iriri, a trembling at the surface announces something extraordinary. Groups of up to 100 electric eels — each stretching 1.5 metres and capable of producing 860 volts — converge to herd schooling fish into tight, panicked balls. Then, in synchronized pulses, they discharge simultaneously. Fish erupt from the water as if thrown by an invisible hand; eels breach and roll at the surface, their dark bodies briefly visible before sliding back into the tannin-stained current. The electrical discharges are powerful enough to stun fish en masse and are perceptible to human observers as a faint tingling in the water. Watching from a canoe, you hear the commotion before you see it — splashing, the slap of fish on the surface, and the sudden convergence of large bodies in the shallows. This is not a zoo or a tour set-piece; it is a raw, accidental window into behaviour science only described in 2021, unfolding in one of the most remote river systems in the Brazilian Amazon.
When to go
Jan — Dec
Getting there
Nearest airport: BEL. Nearest city: Altamira.
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