"Updated federal advice on mercury levels in fish appears to have stalled within the U.S. department of health, frustrating scientists and advocacy groups who argue that exposure to mercury may be dangerous at lower levels than previously thought."

"The government last revised its mercury guidance in 2004 when it said young children, pregnant women, nursing mothers and women who might become pregnant should eat seafood but avoid shark, swordfish, king mackerel and tilefish, which contain relatively high levels of mercury.

It recommended that this population eat up to 12 ounces a week of fish and shellfish that are lower in mercury, such as shrimp, salmon, pollock and catfish. These recommendations were by and large incorporated into dietary guidelines adopted by the health and agriculture departments in 2010."

Toni Clarke reports for Reuters May 16, 2013. [2]