The aquarium sent a release w/ info on their eel Christmas display.
Here's a quick summary: The display has four strands of lights on a five-foot tree in the Journey to South America gallery, set with energy generated from the eel tank. The electricity is transferred to stainless steel electrodes that power a sequencer, which sends the current to power the lights.
Eels usually power up when they're catching prey or fending off predators. They can get up to about 600 volts, five times the output from your wall socket...so in other words, Living Planet's lights have a pretty strong power source.
Electric eels light up the holiday season at the aquarium till Dec. 31. 725 E. 10600 South, Sandy Click here for more info
Lucky for us, they also sent photos:
The Christmas eel lighting up his tree
Side view of the shocker
Don't mess around, this eel has 600 volts with your name on them, actually for the tree