Shellfish toxin poisoning | Names of toxins included | Examples of causative algal species | Images of species |
Syndromes | ||||
Paralytic Shellfish Poisoning (PSP) | Saxitoxin, Gonyautoxins, N-Sulfocarbamoyl toxins (C-toxins) | Alexandrium spp., Gymnodinium catenatum |
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Numbness of the lips, tongue or limbs, headache and dizziness commonly occur within 30 minutes after consumption, no lasting effect when recovered. Extreme case: muscular paralysis' pronounced respiratory difficulty; choking sensation; death through respiratory paralysis may occur within 2 - 24 hours after ingestion. |
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Diarrhetic Shellfish Poisoning (DSP) | Okadaic acids, dinophysistoxins, pectenotoxins, yessotoxins | Dinophysis spp., Prorocentrum spp. |
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Diarrhoea, nausea, vomiting, abdominal pain within a few hours. Complete recovery is expected within three days. Extreme case: Chronic exposure may promote tumour formation in the digestive system. |
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Neurotoxic Shellfish Poisoning (NSP) | Brevetoxin | K. papilionacea | ![]() K. papilionacea |
Chills, headache, diarrohea; muscle weakness, muscle and joint pain; nausea and vomiting within 3-6hrs. Extreme case: Paraesthesia: altered perception of hot and cold, difficulty in breathing, double vision, trouble in talking and swallowing. |
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Amnesic Shellfish Poisoning (ASP) | Domoic acids | Pseudo-nitzschia spp. | ![]() P. pseudodelicatissima |
Nausea, abdominal cramps, vomiting, diarrhea within 3-5hrs. Extreme case: Decreased reaction to deep pain, dizziness, hallucination, confusion; short term memory loss; seizures. |