Every fall, coho salmon undertake an epic journey from the ocean back to the freshwater streams and creeks where they were born so they can reproduce and then die shortly after. For several decades, though, scientists have observed that a disturbing number of these migrating fish in the Pacific Northwest die while swimming through urban waterways polluted by stormwater runoff. At some sites, between 40 and 90 percent of returning salmon may die before they have a chance to spawn.
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