Contaminant levels in fish due to Chemicals of Mutual Concern (CMCs) has become a growing concern amongst consumers within the Lakehead Watershed. Canadian and U.S. federal, tribal, state, and provincial agencies monitor the chemical concentrations in the edible portions of fish (i.e. fillets). Consumption advice is issued in an effort to avoid the negative health effects of harmful pollutants found in fish and wildlife. The Guide to Eating Ontario Fish was developed to provide fish consumption advice for both general and sensitive populations (women of child-bearing age and children under 15). Fish consumption advisories are based on location, type of fish, length of fish, and recommended number of meals.