Shedd Aquarium (formally the John G. Shedd Aquarium) is an indoor public aquarium in Chicago, Illinois in the United States that opened on May 30, 1930. The aquarium contains 32,000 animals, and was for some time the largest indoor aquarium in the world with 5,000,000 US gallons of water. Shedd Aquarium was the first inland aquarium with a permanent saltwater fish collection.