Boys are possibly more sensitive than girls. In higher doses it can cause cerebral palsy. The threshold for effects on the foetus is also the subject of debate. There were very few cases at these lower concentrations. The results of this latter study have been questioned because of methodological problems.
Many questions remain about the effects of mercury on the foetus.
All these concerns about the toxicity of mercury should not prevent us to attempt a cost-benefit analysis of the recommendations which are to be given to the Cree population. The restrictions on fishing are very culturally disruptive as many social and family activities are centered on fishing. Banning fish causes also an economic stress because fish is a cheap source of food. Without fish, families have to buy more food. Restriction on fish consumption can also be deleterious because fish in itself is nutritious.