The specific aim for this ongoing study is to determine whether female subjects (18-40 years of age, target=120) who enroll in the study with elevated hair mercury levels (>0.8 ppm) and are then fed low mercury fish (farmed salmon or farmed tilapia at 6 ounces [170 g]/week for 12-13 weeks), while avoiding other seafood, will significantly decrease their hair and blood mercury concentrations while maintaining or increasing their plasma omega-3 fatty acid (EPA/DHA) levels.