Mercury in fish

The U.S. Environmental Protection Agency (EPA) recommends that children and women of childbearing age who eat 2 to 3 fish servings a month should select fish with less than 300 parts per billion of methylmercury. The EPA has not developed any guidelines for the general population. The Oklahoma Department of Environmental Quality (ODEQ) set a guideline of 500 parts per billion for children and women of childbearing age and 1000 parts per billion for the general population. ODEQ's guideline estimates people eat 2 fish servings a month and does not take into account the saltwater fish in people's diet

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Notes:

Mercury concentrations are expressed in parts per billion, a measure of how concentrated a contaminant is in the fish tissue.

Concentrations are expressed on a wet weight (fresh weight) basis.