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Even after being treated, wastewater is causing some male fish to lose their sexuality and resulting in a crash in reproduction levels, according to a study by the National Water Research Institute in Ontario, Canada. The study adds to a recent barrage of evidence that fish are being harmed by trace levels of pollution flowing from sewage plants.
A five-month study of fathead minnows showed a 50 percent decline in reproduction among fish exposed to high levels of treated wastewater effluent. Male fish also exhibited a significant loss of secondary sex characteristics, the physical attributes that make them attractive to female fish, the likely explanation for a decline in egg production.



