 The zoo's first aquarium was also the world's first public aquarium, and was created and stocked by Philip Henry Gosse who coined the word "aquarium".The most recent aquarium was built in 1921 next to the Mappin Terraces, and was officially opened by King George V and his wife Queen Mary in April 1924.The aquarium was separated into three halls, each home to different types of fish and other aquatic wildlife.