article_snippet: Puffer fish - also called blowfish or fugu in Japanese - are the world's most toxic group of fish and their livers, ovaries and skin contain tetrodotoxin, 100 times more lethal than cyanide.
article_snippet: Chefs who want to serve puffer fish must train for two years before taking a rigorous test which a third of applicants fail.
article_snippet: The most prized species is the tiger puffer, takifugu rubripes, whose flesh is safe to eat but whose liver, ovaries and intestine can all kill.
article_snippet: It is not clear which species of puffer fish
article_snippet: Puffer fish account for the majority of Japan's food poisoning deaths but the delicacy shows no sign of dying out, although it is heavily regulated.
highlights_snippet: Puffer fish toxins kill - but aficionados eat just enough for tingling on lips .