Extensionally known for the Minamata disease, it was caused by the release of methyl mercury (CH3Hg) from the industrial wastewater of the Chisso Corporation’s cherncal factory into Minamata Bay and shiranui Sea. This highly toxic heavy metal was accumulated in shellfish and fish, eaten by the local people, living in these areas. Consequently, living organisms i.e. cat, dog, pig and human deaths continued form over 30 years (Ministry of Environment, 2002). Mercury exists in the inorganic form as free mercury (Hg0) mercury ion in salts and, which have been used as fungicides and herbicides, and alkyl – mercury compounds including possibly by fish (Boonsaner, 2006)