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THE GOVERNMENT is to conduct new research into the levels of mercury in fish amid
claims that children who eat too much tuna may develop learning difficulties,
writes Jon Ungoed-Thomas.
The Food Standards Agency (FSA) warned pregnant women two years ago to limit their
consumption of tuna to two cans a week to protect their unborn children.
There are now concerns — echoing health fears in America — that
children should be prevented from eating too much tuna because its flesh becomes
contaminated more than most fish with mercury from polluted waters.
An FSA spokesman said this weekend that it would fund research to improve testing
for mercury in fish.
Concerns have been raised following the case of an American child who developed
learning difficulties after eating a portion of tuna a day. Doctors who conducted
blood tests concluded the child was suffering from mercury poisoning.
Michael Bender, director of the Mercury Policy Project, a non-profit organisation
that campaigns for reduced mercury pollution, said: “The FSA needs to
take the next step and recommend a proper limit for the amount of tuna children
can eat.”
Mercury occurs naturally in the environment, but is also released into the
air through industrial pollution which is taken into the sea by rain. Fish absorb
it as they feed, but some larger predators such as tuna are more likely to have
higher concentrations because they feed on smaller fish.
Concern over the potential risk was highlighted in Britain after a study in
the Faroe Islands in 1997. It concluded that children exposed in the womb to
mercury had difficulties with learning, memory and attention.
Although the fishing industry argued the study was flawed, the Environmental
Protection Agency (EPA) in America subsequently set recommended safety limits
for the amount of mercury in adults’ and children’s diets.
In Britain the FSA advised children not to eat shark, marlin and swordfish.
Tuna has, however, been exempt from restrictions because tests showed it had
lower mercury levels. On the other hand, it is a fish that is popular with children.
The FSA said last week there was “no upper limit” for children
eating canned tuna. Campaigners, however, say the FSA should now give parents
guidelines on the amount of tuna children can eat.
In California it has emerged that Matthew Davis, 10, consumed a portion a day
of white albacore tuna. Although he had previously seemed bright and motivated,
he started to have learning difficulties.
His parents became concerned when they noticed his fingers were starting to
curl, as if he was holding a ball. A neurologist ordered blood tests and it
was found he was suffering from mercury poisoning.
An FSA spokesman said last week that only a small quantity of tuna in Britain
was albacore. He added the agency was recommending to the European Union that
it funded research to establish the potential risk.