The Mekong Basin houses over 850 species of fish, making it second only to the Amazon. More species continue to be discovered. The Mekong is also home to some of the world’s largest freshwater animal species. No other river supports as many huge fish species. At this massive exhibit, which is the size of four double decker buses, you can get up-close to river giants like the Mekong giant catfish, giant freshwater stingray and Siamese carp.