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USGS CERC scientists study toxicity using caged fish and frogs

Detailed Description

Biologists from the USGS Columbia Environmental Research Center (CERC) use fish and frogs in cages suspended in flowing streams to study the effects of stream contaminants on fish and frog development.  Here, three biologists wrestle with a cage in high water, as part of the Regional Stream Quality Assessments (RSQA).


Public Domain.