Although the Oklahoma Aquarium is closed in Jenks, workers still have to come in to take care of the fish.

Aquarium managers were buying food and other supplies for the employees who are staying in a nearby hotel.

"They are checking on the aquarium in shifts around the clock. A lot of our equipment that is on the roof doesn't like this kind of temperature so they have to monitor that and of course the fish have to be fed and looked after and checked on," said Kenny Alexopoulos, COO Oklahoma Aquarium.

The aquarium does have back-up generators, just in case the power goes out.