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In Mark Servos’s biology department lab, waders and long-handled nets compete for space with a mass spectrometer. Servos, an eco-toxicologist and holder of the Canada Research Chair in Water Quality Protection, explains that he researches the impact of contaminants on aquatic life at levels “from gene expression all the way up to whole communities of fish.”

Mark Servos of the University of Waterloo explains how male fish in the Grand River are exhibiting female traits.

WATERLOO REGION — A local researcher says sewage from the region’s waste water treatment plants is making male fish female in the Grand River.