September 3, 2014

Small Fish Test Helps Target PCB Clean Up

Jay Davis didn’t expect much from a pilot test for PCBs in silversides and topsmelt that live on the edges of the San Francisco Bay. The monitoring program he heads only ran the test on these small fish, which rarely grow more than 3-4 inches long, because it was simple to piggyback on an existing study of mercury in the same fish samples. “I thought it wouldn’t really be a big deal,” says Davis, who is lead scientist for the Bay Regional Monitoring Program (RMP). PCBs, a toxicant linked to cancer, accumulate in fat as bigger creatures eat littler ones, so Davis assumed concentrations would be lower in small fish than in larger sport fish. The pilot study revealed the...
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