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 (19,000,000 l; 4,200,000 imp gal) of water.. The shedd aquarium once was the largest indoor aquarium in the world, the first inland aquarium with a permanent saltwater fish collection. a gift of john g. shedd, a protege of marshall field, who was the benefactor of the nearby field museum, it was opened... more. thank taylor b .. Shedd aquarium is home to pacific white-sided dolphins. take a 360-degree tour of an underwater reef community. the 90,000-gallon caribbean reef exhibit, at the hub of shedd's original galleries, is a great place to start your visit..