Kumamoto University research group announces “Minamata disease is caused by consuming fish and
shellfish from Minamata Bay. It is strongly suspected that mercury is the causative agent.”
Chisso begins experiments with cats by feeding factory wastewater, and a cat shows symptoms,
although it is not revealed.
Patients’ families conclude “sympathy money contract” with Chisso, which states 300,000 yen should
be paid for the deceased.