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Perfectly Fresh Shellfish Can Suddenly Kill You

This documentary traces the hidden history and science of paralytic shellfish poisoning, following the journey of saxitoxin from microscopic marine algae to the dinner plate. Beginning in a quiet coastal town just before a red tide event, it explains how dinoflagellates multiply into harmful algal blooms, how mussels, clams, oysters, and scallops silently accumulate this invisible neurotoxin, and why the water can appear safe even when it is not. Along the way, it explores the molecular biology of saxitoxin, showing how it blocks voltage-gated sodium channels in human nerve cells and leads from mild tingling and numbness to paralysis and respiratory failure in severe poisoning cases. The film weaves in historical outbreaks of paralytic shellfish poisoning from different coastlines and time periods, highlighting how indigenous communities developed seasonal harvesting rules and traditional knowledge long before modern toxicology identified saxitoxin. It then turns to the present, examining how climate change, warming oceans, and nutrient runoff are altering the geography and frequency of harmful algal blooms, and how marine biologists now use water testing, shellfish monitoring, and laboratory detection methods to set safety limits and close fisheries when needed. By the end, the documentary clarifies which seafoods are most risky during blooms, why cooking and freezing cannot destroy saxitoxin, and how modern public health surveillance stands between a microscopic ocean organism and a potentially fatal human poisoning event.