Each fall, thousands cohort samen flock to northwest river to spone. but many never get the chance especially near bit city like Seatle.and some of these urban areas'90 percent of female were dieing before this bound, which is not a good thing for a population.Julen Spronberg, a talkscologist affiliated with northwest fishery science center.researcher suspect this death were partly a matter of bad timing.The fish often reach stream during the first showers of the raining season, which flush chemicals from the roads and parking lots into the water.Now Spronberg and his colleagues have procuced the first direct evidence that is run off kills cohort samen. Their study is in a journal of plant ecology.The researchers found that fish expose to storm water from Seatle area highways quckly grew second died. Surprising ledou the samen didn't seem to mind taking a step cocktailer of common road polluance including hydrocarbons and metals, that detail suggest the chlorine grading in them of may be a different chemical or little combination of several componts."there is whole what stofen here we have any automeasure or don't have capability measuring at this point." Spronberg says there is way to help fish even before the scientist count on the cooperate.Her team also found fortune run-off just fuel fit of soil made storm water safe for samen. City can implement this simple form of clean water technology by building more systems including roadside ringers to collect run off from paved areas, and passage to soil before enters urban waterway. literally,a quick undirty solution.

Thanks for the inute for scientific American science, I'm Julie Rosen.