If you're like me and tinned tuna happens to be a relative staple of the diet: switch to salmon and spread the word.

Why? Well, it's not mercury, it's the grim specter of mass extinction you and I indirectly contribute to.

"...University of British Columbia Prof. Daniel Pauly's research has shown that the oceans have lost 90 per cent of tuna, swordfish and marlin. He is also an advocate for marine reserves..."

http://www.cbc.ca/story/science/national/2005/07/13/Pauly-prize050713.html