Q2: What is the cause of Minamata disease?
A2: It is methylmercury discharged from the chemical factory into the sea,
which was accumulated in fish and shellfish.
Methylmercury discharged from the Minamata factory of Chisso Corp. into
Yatsushiro Sea was accumulated in fish and shellfish.
People who ate a lot of the contaminated fish over a long period of time
showed the symptoms of Minamata disease, because it was difficult to distinguish
fish contaminated with methylmercury from non-contaminated ones at that