The Fugu is the Japanese name given to the pufferfish, where it is a served as a delicacy in restaurants. There are several species of Fugu -all of which are toxic. Fugu poison is 1200 times stronger than cyanide and leads to paralyzation and asphyxiation. This poison is most concentrated in the liver. The fish has to be carefully prepared before it is suitable for human consumption, although aquaculture has now lead to "safe" fish being bred. In the wild, the Fugu is not a fast swimmer, although he can swim backwards and manoeuvre well. If threatened, he fills his elastic stomach up with water, bloating up to become almost spherical.