Set of 3 stuffed puffer fish. Scientific name: Tetraodontidae Also known as: balloon fish, pufferfish, porcupine fish, puffer fish Size: 21cm, 16cm, high. Please note that this is a natural product. The specimen delivered may differ from the image. Puffer fish are usually small to medium-sized and have a number of distinctive features, such as beak-like teeth, fused jaws, and the absence of ribs and pelvic fins. These adaptations are related to their unique defence mechanism: they can quickly inflate themselves by absorbing water (or air) into their bodies. Instead of scales, they have spiny skin structures. Within the family Tetraodontidae - which includes the Mbu pufferfish - these spines are generally smaller than in related species from the Diodontidae family.