Swellfish is a term used to describe a type of fish that inflates its body when it feels threatened. This fish is also known as a pufferfish, blowfish, or fugu. The term "blowfish" is often used to describe this fish when it is eaten as a delicacy in Japan, but Fugu is the word typically used to describe the fish at restaurants. In addition, people sometimes use the terms globefish, sea squab, and balloonfish to refer to the swellfish. All of these names describe this unique fish that inflates its body as a defense mechanism against predators. Regardless of the name it is called, the swellfish is a fascinating creature with many unique characteristics.