I wouldn't be too quick to lay the blame at mesitylene yet. I'm still seeing conflicting reports: https://www.dw.com/en/mysterious-mass-fish-kill-in-oder-river-

I wouldn't be too quick to lay the blame at mesitylene yet. I'm still seeing conflicting reports: https://www.dw.com/en/mysterious-mass-fish-kill-in-oder-river-climate-change-or-poison/a-62784099 https://www.dw.com/en/mysterious-mass-fish-kill-in-oder-rive... > At the time, the Lower Silesia Water Authority based in the nearby Polish city of Wroclaw detected a toxic substance in two locations on the Oder that is likely the solvent mesitylene, which is known to have a toxic effect on fish. However, subsequent tests have shown no trace of the substance.