Gambierdiscus is a genus of marine dinoflagellates, which are single-celled organisms found in tropical and subtropical waters. These organisms are known for their role in the ecosystem, particularly in coral reef environments, where they can contribute to the food web. Some species of Gambierdiscus produce toxins that can accumulate in fish, leading to a condition known as ciguatera fish poisoning in humans. This poisoning can cause various symptoms, including gastrointestinal and neurological issues, making it important to monitor and manage the presence of these dinoflagellates in affected regions.