Deputy Department of Fishery director-general Somwang Phimol-but (2013) said the mercury level found in two tests at Prachin Buri river was the highest ever detected . To order who feed on fish caught in Prachin Buri river to stop eating. Because humans risk ingesting dangerous levels of mercury when they eat contaminated fish. Once in the human body, mercury acts as a neurotoxin, interfering with the brain and nervous system. Exposure to mercury can be particularly hazardous for pregnant women and small children. A child's brain is still developing and rapidly absorbing nutrients. Even in low doses, mercury may affect a child's development delaying. In adults, mercury poisoning can adversely affect blood pressure regulation and can cause memory loss, tremors, vision loss and numbness of the fingers and toes also lead to heart disease.