Here's a guide from the New Hampshire Department of Environmental Services for eating local freshwater fish. For all fish except trout, follow these guidelines:

• Pregnant and nursing women, and women who may become pregnant, can safely eat one 8-ounce meal of freshwater fish a month.
• Children under age 7 can safely eat one 8-ounce meals of freshwater fish a month.
• All other adults and kids 7 and older can safely eat four 8-ounce meals of freshwater fish a month.

In New Hampshire, there are some fishing spots to watch out for: According to DES (http://des.nh.gov/) fish from several water bodies in the state have been shown to have higher than average mercury concentrations.
For the water bodies below, DES says, “sensitive populations should not consume any fish,” and others should limit consumption to two meals a month:
• Ashuelot Pond in Washington
• Comerford and Moore reservoirs on the Connecticut River
• Crystal Lake in Gilmanton
• Dubes Pond in Hooksett
• Jackman Reservoir in Hillsboro

We’ve all heard that the world’s marine life is being depleted at an alarming rate, sometimes in very destructive ways, but when it comes down to buying seafood or ordering it, it’s difficult to guess which choices are good or bad.