Fish are Food not Friends.
As for the level of toxins in fillets, I think you greatly reduce the level if you remove the lateral line. That darker softer section is where I believe fish store most metals, like iron or mercury. By storing the heavier minerals along the lateral line it assists them in migration like a built in compass. I think nature designed it to store iron, but a bycatch is mercury and other toxins.
I'm not sure if it reduces that much, but I always remove the dark meat along the lateral line from my fillets.
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