[cies]

Almost all seafish is toxic even in small, weekly amounts. I think the main contributor to this is mercury, that was once used in industrial processes, which basically still all sits on the bottom of the sea (where many fish eat from).

[claytongulick]

The science of that is far from settled.

There's evidence that mercury in fish accumulates from natural sources [1]

https://www.sciencedaily.com/releases/2003/12/031205053316.h...