Tetraodon, commonly known as pufferfish, is a genus of fish found in both freshwater and marine environments. They are recognized for their unique ability to inflate their bodies as a defense mechanism against predators. Tetraodon species are characterized by their rounded shape and spiny skin, which can deter potential threats. These fish are also known for their toxic properties, as many species contain tetrodotoxin, a potent neurotoxin. This toxin can be harmful or even fatal to humans and other animals if ingested. Tetraodon plays a significant role in their ecosystems, often feeding on invertebrates and contributing to the balance of aquatic life.