長崎大学
Scientists at Nagasaki University have reportedly succeeded in creating a non-toxic variety of torafugu by restricting the fish's diet. After raising over 4,800 non-toxic fish, they are fairly certain that the fish's diet and digestive process actually produce the toxins. The non-toxic version is said to taste the same. Some skeptics say that the fish being offered as non-toxic may be of a different species, and that the toxicity has nothing to do with the diet of the pufferfish.