Rivers in North Carolina contain small concentrations of mercury which can accumulate in fish over their lifetimes. Because mercury cannot be excreted from the body, it builds up in the tissues. The concentration of mercury in fish tissue can be obtained at considerable expense by catching fish and sending samples to a lab for analysis. Directly measuring the mercury concentration in the water is impossible since it is almost always below detectable limits.
A study was recently conducted in the Waccamaw and Lumber Rivers to investigate mercury levels in tissues of large mouth bass. At several stations along each river, a group of fish were caught, weighed, and measured. In addition a filet from each fish caught was sent to the lab so that the tissue concentration of mercury could be determined for each fish. Each fish caught corresponds to a single row of the file. In order, the recorded information for each fish is
RIVER, 0=Lumber, 1=Waccamaw
STATION NUMBER 0,1,...,15
MERCURY CONCENTRATION (ppm)
Source: Provided by Craig Stowe, Nicholas School of the Environment circa 1990s