The advice to eat more seafood for a healthy heart might be familiar, but when consumers get to the fish counter, there are confusing questions galore: Which types have the most of those good fatty acids? Which are high in mercury? Which are better for the environment?

The Environmental Working Group, in a report out Tuesday, says the federal government is not doing a good enough job at answering those questions for consumers, especially when it comes to advice covering children and pregnant women.

"You can’t just tell people to double or triple their consumption" without clear information about what to eat, Sonya Lunder, one of the authors of the report, said by phone Tuesday.

People who follow the federal government’s advice could consume too much mercury or too few omega-3 fatty acids, the fats that are good for the heart, the report concludes.

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