I'd be surprised if even back in the 70's that Tokyo bay was so polluted that pollution-contaminated shellfish could make people sick immediately. Seems more li

I'd be surprised if even back in the 70's that Tokyo bay was so polluted that pollution-contaminated shellfish could make people sick immediately. Seems more likely that it was some kind of bacterial, algae or biotoxin poisoning (which can happen even in unpolluted waters) With longer term exposure, sure I could see health effects, but not from a single meal. Even under stringent environmental regulation, I'd avoid seafood caught in any large city's bay, since decades old contamination can still cause problems today.