Contaminants in Fish and Wildlife Long-lasting contaminants, such as PCBs, DDT, and mercury, build up in your body over time. It may take months or years of regularly eating contaminated fish to build up amounts which are a health concern. Health problems which may result from the contaminants found in fish range from small changes in health that are hard to detect to birth defects and cancer. Mothers who eat highly contaminated fish and wildlife for many years before becoming pregnant may have children who are slower to develop and learn. The meal advice in this advisory aims to protect children from these potential developmental problems.
Adults are less likely to have health problems at the low levels that affect children.
Some contaminants cause cancer in animals. Your risk of cancer from eating contaminated fish and wildlife cannot be predicted with certainty. Cancer currently affects about one in every three people, primarily due to smoking, diet, and hereditary risk factors. Exposure to contaminants in the fish and wildlife you eat may not increase your cancer risk at all. If you follow this advisory over your lifetime, you will minimize your exposure and reduce whatever cancer risk is associated with these contaminants.