Ciguatera Fish Poisoning

At certain times of the year various species of fish and shellfish (especially the larger reef fish including shark) contain poisonous toxins. The risk of illness is reduced by washing the flesh. Cooking does not inactivate the toxins. see also www.who.int/ith/chapter03_02.html#4

The most common symptoms are diarrhoea, vomiting,  myalgias (muscle pains and paraesthesias (numbness, burning), beginning 6 to 24 hours after ingestion. Other symptoms may include faintness (low blood pressure), blurred vision, watery eyes, headache and shortness of breath.

The paraesthesias frequently involve the palms of the hands, soles of the feet and lips.  It may cause a metallic taste in the mouth. The symptoms usually last some 3 weeks but may be longer. These neurological symptoms are often more severe and longer lasting with subsequent poisoning episodes.

There is no specific treatment for the condition but presentation to medical centre is advised if the person is more than unwell. Contact the Poisons Information Service in your area for advice.