Also known as Blowfish because they can gulp in air or water into their highly elastic stomachs to frighten away predators. The pufferfish (Tetraodontidae) has a deadly neurotoxin (Tetrodotoxin
) that closes voltage gated sodium channels and paralyzes the victim. There is no antidote. Yet, the flesh of the fish is considered a delicacy although it must be prepared with great care to avoid killing the diner. As little as half a milligram of toxin (0.00002 oz) can kill a person by injection or a bit more (0.000881 oz) if eaten.
Tetrodotoxin: http://en.wikipedia.org/wiki/Tetrodotoxin #ScienceEveryday