Our chart lists 18 recommended seafood choices—ranked from least to most mercury—and tells you which have the most omega-3s.

The developing nervous system is especially sensitive to mercury, so women who are—or might become—pregnant, breastfeeding mothers, and young children face the greatest risks. That’s why our chart focuses on these groups.

The Center for Science in the Public Interest, Nutrition Action‘s publisher, created this chart as part of its comments urging the Food and Drug Administration to revise the agency’s seafood advice for consumers based on the best science.

This post has been updated to reflect corrections to the order of fish and designations for omega-3 sources.