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Mercury contamination is not something unique to fish. Your McDonald's hamburger patty probably has a similar amount of mercury in it. For some reason, people aren't looking that closely at domestic meat supplies.

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I don't really get that Lar. Cows eat grass. That is where the food chain ends. Mercury in fish on the other hand gets bioaccumulated in the food chain. Big fish who live a long time like tuna accumulate a fair bit of mercury so says my professor. Fish like salmon are OK. My professor told us to not eat tuna more than once a week. She said that other smaller fish are OK. Even some bigger fish are OK too, if they don't have a long lifespan.

Is there really that much mercury in the soil?