What was causing mass deaths of endangered coho salmon in the Pacific north-west as they returned to streams to spawn
It took years to find out it was
A toxic substance in leachate from car tyres that killed the fish.
www.theguardian.com/environment/...
theguardian.com
Is tyre pollution causing mass deaths in vulnerable salmon populations?
A US judge will decide if, as research suggests, a chemical tyre additive is harming endangered fish species
