Amnesic shellfish poisoning (ASP) is a type of food poisoning caused by consuming shellfish contaminated with toxins produced by certain algae, particularly Pseudonitzschia. These toxins, known as domoic acid, can accumulate in the tissues of shellfish, such as clams, mussels, and oysters, making them dangerous to eat. Symptoms of ASP can include confusion, memory loss, and gastrointestinal issues. In severe cases, it can lead to neurological problems and even death. To prevent ASP, it is important to monitor shellfish harvesting areas and adhere to safety guidelines regarding shellfish consumption, especially during harmful algal blooms.