Violent GI symptoms precede paresthesias, muscular contractions, and seizures. Marked dysrhythmias and cardiac arrest have been reported. No toxin has been identified, and currently no antidote exists. Treatment is restricted to supportive care. Hallucinogenic fish poisoning Hallucinogenic fish poisoning can occur with the ingestion of a number of fish species.
Hallucinations occur in isolation with no other symptomatology.
The bulk of shellfish poisonings are infectious in nature. They are paralytic, neurologic, diarrheal, and amnestic shellfish poisonings. Toxins are found in microscopic diatoms and dinoflagellates with concentrations occurring in filter feeding bivalves, such as clams or mollusks. Despite folklore that contends that shellfish are universally safe if eaten during months containing the letter r, correlation between outbreaks of shellfish poisoning and water temperature is poor. The incidence of shellfish poisoning has been declining, most likely because of careful monitoring, beach closures, and improved public awareness.