Three more sharks swimming in Charleston aquarium

South Carolina Aquarium staff releases one of three large male nurse shark into the AquariumþÄôs 385,000-gallon Great Ocean Tank on Friday May 23, 2014. (South Carolina Aquarium)

A trio of large sharks from the Southwest are swimming in the Holy City.

The predators made a thousand-mile trip from the Oklahoma Aquarium in a specially-rigged truck that is like an aquarium on wheels.

They arrived here on March 7, said South Carolina Aquarium spokeswoman Kate Dittloff.

At first, the male nurse sharks lived in a large quarantine tank to make sure they were disease-free.

Then they were turned loose Friday into the 385,000-gallon Great Ocean Tank, the waterfront aquarium's main attraction.

Two of the sharks are seven-feet long and 200 pounds. The third one is a nine-footer who weighs 250 pounds.

With the addition of the newcomers, the aquarium has 14 sharks including nurse, blacktip, sandbar, sand tiger and blacknose species.

Three nurse sharks were already living in the Great Ocean Tank, which is home to 750 animals.

Nurse sharks are commonly found in coastal waters of the Atlantic and the eastern Pacific oceans. They range from Rhode Island to Brazil in the western Atlantic, according to the aquarium website.

The sharks are nocturnal and can be found resting on the sea floor during the day. They feed on bottom-dwelling animals such as stingrays, shrimp, squid, octopus, crabs, snails, urchins and lobsters. They do not have to keep swimming to breathe as some other sharks do.

Nurse sharks are considered relatively harmless, but will bite if harassed or provoked, the aquarium says.