There IS mercury in fish, more in some and less in others (tuna is not on the "safe" list!), but from what I've read, I won't eat it any more. Consider all the work you do to detoxify and get rid of the heavy metals. Why would you want to put them back in??? For more information, an excellent site to visit is http://www.mercola.com/2001/apr/25/mercury_fish.htm