"Toby's particular blue hue is said to be a 1-in-2-million exception to the reddish-brown shade of most lobsters," according to a release from the National Aquarium. "This unique color is a genetic variation that is caused by the lobster producing an excessive amount of a particular protein."
Toby was discovered by John Gourley and a crew aboard the fishing boat Pot Luck off the Maryland coast near Ocean City. The crew donated Toby to the aquarium in June 2012.
The aquarium will featured Toby in its Atlantic Shelf exhibit.