Ciguatera, or fish poisoning, is an illness caused by eating fish containing certain toxins. These toxins come from a type of algae, and get into the fish either through eating the algae, or eating fish which have eaten the algae.
It can cause symptoms including nausea, vomiting and tingling in fingers or toes. Symptoms usually go away in a few days or weeks but can sometimes last longer. Ciguatera can be found in many area of the tropical Pacific and Indian ocean regions and the Caribbean.