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Electric Eel Shocks Like a Taser
Science_afficionado writes After a nine month study, a Vanderbilt biologist has determined that the electric eel emits series of millisecond, high-voltage pulses to paralyze its prey just before it attacks. The high-voltage pulses cause the motor neurons in its target to violently contract, leaving it temporarily immobilized in the same fashion as the high-voltage pulses produced by a Taser. He documented this effect using high-speed video. The eel, which is nocturnal and has very poor eyesight, also uses closely spaced pairs of high-voltage pulses when hunting for hidden prey. He determined that the pulses cause the prey's body to twitch which produces water movements that the eel uses to locate its position even when it's hidden from view.
They describe this in the signage on the eel tank at the New England Aquarium. They even have a "shock" meter - and they tell you when it is getting ready to shock, you will see some spaced-out low-intensity pulses before "the big one".