In the United States, tolerances for pesticide residues in fisheries products are referred to and enforced by the U.S. Food and Drug Administration (U.S. FDA, 2001) as action levels, which are typically those recommended by the U.S. Environmental Protection Agency (U.S. EPA). These federal action levels are residue limits at or above which U.S. FDA has authority to take legal action to remove the product from the market. Local authorities frequently adopt these levels for deciding whether to issue consumption advisories or to close waters for commercial harvesting of all or certain species of fish. Several countries including Canada (CFIA, 2005) and Japan (MHLW, 2005) have also used U.S. FDA’s action levels as reference standards in setting their own national limits.