Survey of cadmium, lead, and mercury in shellfish

The Food Standards Agency has conducted a survey of cadmium, lead and mercury in shellfish. This survey analysed 125 shellfish samples from commercial shellfish beds around Great Britain and 30 retail samples. Samples included were mussels, cockles, oysters, clams, whelks, winkles, scallops and razor shells.

The aim of this study was to provide data on the food safety implications of cadmium, lead and mercury in shellfish and to provide data to inform any future European Commission (EC) discussions on the revision of limits for these metals in shellfish.

Cadmium, lead and mercury concentrations were analysed in 125 shellfish from commercial shellfish beds around Great Britain, of which 98 were pre-spawning and 27 were post-spawning samples. Thirty retail samples were also analysed.

Three samples of mussels exceeded the regulatory limit for lead and two samples of scallops exceeded the regulatory limit for cadmium. All five samples were taken directly from shellfish beds and the relevant local authorities were notified. All of the samples exceeding the regulatory limits were of pre-spawning shellfish.

Intake estimates of cadmium, lead and mercury measured in shellfish in this survey show that even people who eat well above average amounts of shellfish would still be below the safety guidelines, taking into account the rest of the diet.

Overall the levels of cadmium, lead and mercury found in the shellfish analysed do not present a concern for health.