Mbu puffer/Giant puffer/Giant freshwater puffer ( Tetraodon mbu ) The Mbu puffer, giant puffer or giant freshwater puffer (Tetraodon mbu) is a carnivorous freshwater pufferfish originating from the middle and lower sections of the Congo river in Africa, as well as the east coast of Lake Tanganyika near the Malagarasi River mouth. The species is commonly referred to as the giant freshwater pufferfish due to its massive size, growing to a length of 26 inches. It feeds on smaller fish, mollusks and