Ciguatera is a type of food poisoning caused by consuming fish that have accumulated toxins from marine algae, particularly the dinoflagellate Gambierdiscus toxicus. These toxins can affect various fish species, especially those found in tropical and subtropical waters, such as barracuda, grouper, and snapper. Symptoms of ciguatera poisoning can include nausea, vomiting, diarrhea, and neurological effects like tingling or numbness. The condition is often misdiagnosed due to its similarity to other illnesses, and there is no specific treatment, making prevention through careful fish selection essential.