http://articles.mercola.com/sites/ar..._rid=488862133
The above is a link to an article by Dr. Mercola concerning fish and mercury content, tuna in particular when consumed by children. Please read most of this article to get the gist of it. About 3/4 of the way down, there is a link for a list of the fish w/lowest mercury content to the highest. Print it and keep it on hand.
I have subscribed to mercola.com for several years. I sometimes get anxious about his selling, however, many his article are applicable to good health and improving same.