Blowfish (Fugu)
This fish is deadly on its own, as well as being regarded as a Japanese and Hong Kong delicacy. Its poison, tetrodotoxin, is 1,200 times more potent than cyanide. Around one hundred diners die each year from it.
So if you do dine on it, make sure a licensed chef is at the helm to avoid a culinary catastrophe. The most deadly parts of Fugu include the liver, muscles, ovaries, and skin.