Toxic fish warning for moms-to-be
With its amino acids and high protein levels, fish is a healthy menu choice but now, due to high levels of mercury in fish, food scientists are cautioning pregnant women to consume fish in moderation.
Speaking at a South African Food Science Technology briefing in Durban recently, Herman Koëter, managing director of the Belgian Orange House Partnership (a body of scientists who advise governments and the private sector on environmental, chemical and food safety), raised the question: “Is fish safe”?
Koëter is a former scientific director of the European Food Safety Authority.
He said that, although research had shown high levels of mercury in fish above the EU’s recommended maximum level of 0.5mg/kg of fish and 1mg/kg in predatory fish such as Albacore, yellowfin and bluefin tuna, regulators could not tell consumers not to eat fish because it was an important part of the human diet.
If these levels of mercury were to be applied strictly this would translate to 14g of predator fish per day, or 100g per week; and 28g of other fish a day, or 200g per week.
Koëter said an evaluation of methylmercury in fish had reaffirmed that fish was an important part of a balanced nutritious diet and this fact had to be appropriately considered in public health decisions.
“We cannot say don’t eat fish because, if you look at meat, you will find it’s also contaminated,” he said.
“Pregnant women eating up to two portions of fish per week are unlikely to exceed the provisional weekly tolerated intake for methylmercury, provided that one of these portions is not bluefin or Albacore tuna.”
In Baltic countries, where herring is an important part of the diet, it is recommended that pregnant women do not eat fish because herring from the Baltic sea has been found to have 3.5 times more dioxins than other fish.
Wild Baltic salmon were also more likely to exceed permissible tolerable weekly intakes, Koëter said.
He added that mercury exposure from fish with exposure from air pollution was negligible in comparison.
“The most important contaminants are methylmercury and polybrominated flame retardants. Fish meal and oil are the most important sources of contamination. One solution is to replace this feed with vegetable feed and oils.
“If you are vulnerable, pregnant or have a disease be more careful and don’t do things as usual. If there is anything that you should do in moderation, it is fish. In Portugal, where they eat two portions of fish a day, there is a higher incidence of cancer,” he added. - Independent on Saturday