I live in Minnesota, which is a huge fishing state, and because the majority of our power comes from coal (which releases mercury into the air when it's processed/burned), mercury poisoning is a big issue around here. That's why I have the rote response regarding mercury so well memorized.

And sorry, please ignore in my above post the statement that salmon has a high level of mercury. Doc's right that it is normally an okay source. However, if you're getting Atlantic salmon, you might want to think about getting only wild-caught when you can. The farmed stuff is really bad for the environment, and if you're worried about antibiotics and toxins in your food, they are grown in pretty bad conditions. Other fish, however, are better if they are farmed. I'll see if I can find my "what fish to get farmed, what fish to get wild, what fish to avoid" list.
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