http://ambio.allenpress.com/ambioonline/?request=get-abstract&issn=0044-7447&volume=036&issue=01&page=0062
http://www.eurekalert.org/pub_releases/2007-03/uow-mco030207.php
Here's Mercola on the health risks of consuming mercury-contaminated food:
http://www.mercola.com/2003/jun/21/mercury_fish.htm