Coho Salmon Disappearing From Urban Streams; Study Shows Biofiltering Stormwater Runoff Boosts Survival

A relatively simple, inexpensive method of filtering urban stormwater runoff dramatically boosted survival of newly hatched coho salmon in an experimental study. That’s the good news for the threatened species from the Washington State University-led research. The bad news: unfiltered stormwater killed almost all of them.

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