Why Are Eels in Sushi Restaurants Never Served Raw?

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Because the blood of Eels (Both Unagi, Fresh Water Eel and Anago, Sea Eel) contains Ichthyotoxin, which is poisonous to humans unless it is cooked.

“If you drink a large amount of fresh eel blood, diarrhea, vomiting, skin rash, cyanosis, ataxia, arrhythmia, weakness, paresthesia, paralysis, and difficulty breathing. It can cause death.