What is organic mercury?
Mercury is a metal that can be harmful if you breathe it in or swallow it. Organic mercury is a type of mercury that is found in some fish.
Mercury from industry can get into rivers, lakes and the ocean. Coal burning is the biggest source, but it can also come from other local industry. The mercury gets into the plants that small fish eat. Larger fish eat the small fish and the mercury builds up over time. These larger fish have the most mercury.
If you are are pregnant, breastfeeding or may become pregnant, eating large amounts of fish with mercury may harm your baby.