Shedd aquarium formally the john g shedd aquarium contains over 25 000 fish and was for some time the largest indoor aquarium in the world with 5 000 000 us gallonsof water the shedd aquarium which opened on may 30 1930 was the first inland aquarium with a permanent saltwater fish collection located on the shores of lake michigan shedd aquarium brings you eye to eye with more than 32 500 aquatic animals explore the recreated environments of the amazon river and philippine coral ree