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(10/07/04, Rocky Mountain National Park, CO) Don Campbell, with the United States Geological Survey out of Lakewood, with the help of Chris Kennedy, Molly Bensely, and Linda Beck, from the United States Fish and Wildlife Service, are studying mercury levels in fish caught near the Sun Valley Ranch Bridge, which is across the street from the RMNP Visitor Center for the entrance near Grand Lake. A brown trout - introduced into the park - not native - but a good way to measure mercury is to filet the fish and look for the element in its flesh. (JUDY WALGREN/ROCKY MOUNTAIN NEWS)

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