Also known described as Tetraodon suvattii, , it is a freshwater species that is native to rivers in Indonesia, Malaysia, and Thailand. Pao suvattii, or Arrowhead puffer, is a species of pufferfish. It is a medium sized pufferfish, reaching 6 inches. It is also known as a Pignose Puffer or a Mekong Puffer. It is locally common in the Lower Mekong basin, and is exclusively a freshwater fish. This is one of the meanest puffers you can find so be careful what you put him with.