Rising sea temperatures are pushing pufferfish species together, spawning hybrids that even specialist chefs cannot safely prepare
3-MIN READ3-MINJulian RyallPublished: 9:30am, 2 Sep 2026Japan’s most dangerous delicacy is getting harder to prepare safely as warming seas push different pufferfish species into the same waters, where they are inbreeding to produce hybrids whose lethal toxins are not yet fully understood.Fugu – the collective Japanese name for several species of edible pufferfish – is prized as much for the danger surrounding its preparation as for its subtle flavour.
Many species contain tetrodotoxin, a powerful neurotoxin with no known antidote that can cause paralysis, respiratory failure and death.
Since 1958, anyone wishing to prepare pufferfish for public consumption has had to obtain a licence first, a process that takes at least two years and defeats roughly two-thirds of those who attempt it.
Chefs learn to strip out the fish’s liver, ovaries, eyes and skin – tissues where the poison concentrates – with the precision of a brain surgeon and the nerve of a bomb-disposal technician.
