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Ash said he and the team bathed in the river at night with electric eel, caiman, sting rays, giant river otters and piranha.

He once summoned Begley up to the house to work out the practicalities of keeping electric eels in the swimming pool to generate power.

For centuries this landscape, shaped by ancient rivers, has been shared by ranchers and cattle, which learned to coexist with jaguars, panthers, anacondas, electric eels and crocodiles.

Afterward the scientists fed an anesthetized goldfish to an electric eel, prompting it to emit pulses of up to 185 volts in the tank.

"This indicates that the discharge from the electric eel promoted gene transfer to the cells, even though eels have different shapes of pulse and unstable voltage compared to machines usually used in electroporation," said Iida.