Population Health
January 19, 2021
Tire chemical responsible for killing coho salmon in urban streams
A team led by researchers at the 91探花 Tacoma, 91探花and Washington State University Puyallup have discovered why more than half of the coho salmon that return to Puget Sound鈥檚 urban streams die before they can spawn.
When it rains, stormwater flushes bits of aging vehicle tires on roads into neighboring streams. The killer is in the mix of chemicals that leach from tire wear particles: a molecule related to a preservative that keeps tires from breaking down too quickly.
Now that the chemical has been identified as the 鈥渟moking gun鈥� behind coho death in freshwater streams, the team can start to understand why this chemical is so toxic and, ultimately, how to protect the salmon.