Scientists analyzed 31 studies including hundreds of thousands of patients.
They found that men who ate more fish were 44 percent less likely to develop metastatic prostate cancer. That means the disease that had spread beyond the prostate gland.
Higher fish consumption was also associated with a 63 percent lower risk of dying from the disease.
Scientists reporting in the American Journal of Clinical Nutrition say fish may reduce prostate cancer mortality by reducing men's likelihood of having the disease spread.