It's the Japanese name for certain species of puffer fish that contain lethal poison but can be eaten as a delicacy
The list names 
safe genera including pufferfish of the Lagocephalus and Sphoeroides ... 
produced by certain bacteriasuch as Pseudoalteromonas tetraodonis, certain 
species of... [DOC] [TLE] Pufferfish, Blowfish, Fugu - Poison Sushi?