"FRESNO, Calif. — Federal scientists have found high amounts of mercury in sport fish caught in remote areas of national parks in the West and Alaska, according to a study released Thursday.

Researchers for the U.S. Geological Survey and National Park Service said that most fish they caught had acceptable levels of mercury, but 4 percent exceeded healthy levels.

Mercury occurs naturally, but scientists say its presence in national parks, which are supposed to leave wildlife unimpaired for future generations, was cause for concern."

Scott Smith reports for the Associated Press April 17, 2014. [2]