Fugu is a type of poisonous fish found in the waters of Japan. It is also known as blowfish, pufferfish, or globefish and is highly sought after for its unique flavor. However, it is extremely dangerous to consume due to its high levels of tetrodotoxin, a potent neurotoxin that can cause paralysis and even death. Therefore, it must be prepared by a specially trained chef who knows how to remove the toxic parts of the fish.