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Although fish is considered good for your health, science has been warning about high levels of mercury and other pollutants in ocean fish for years.

However, a major review from the Scripps Institution of Oceanography in La Jolla, California, found steady decreases in contaminants.

Among the contaminants that have dropped significantly over the last 40 years are mercury, DDT and polychlorinated biphenyls, or PCBs. DDT is an insecticide and PCBs are found in many plastics.

In high concentrations, the Scripps researchers note these chemicals can cause cancer, neurological disorders, birth defects and thyroid problems in humans.