I believe you. I would like to know if you have an on-line source for that information that I could pass on to a non-believer.
I remember the story from the 1970s. There had been a warning to not eat fish from Lake Erie due to mercury content. Then not long after, a fish was tested from a museum in Buffalo, that had been preserved since sometime around the turn of the century. Its mercury content was a little higher than the fish from Lake Erie.
The mercury content was such a tiny trace amount there'd been no testing since.
In the 70s, leftists were bending over backward to make the Great Lakes, especially Lake Erie, sound like a cesspool. When Time magazine declared the lake "dead", the fishing on my boat was fantastic. It was around the same time when a spill of gasoline on the Cuyahoga River ignited, and was used to portray the river, and Lake Erie, as polluted beyond description. Of course if you spill gasoline on a pool of distilled water, it will ignite just the same.
All leftist environmental wacko bullshit.