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It has already been known for a long time fish, and in particular tuna, carry a lot of worms and parasites, which is why freezing rules are in place in pretty much every country.

For example here are EU regulations regarding freezing Tuna

https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=PI_...

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Prob dumb question but what about sushi? I'm talking about the storied markets in Japan where they go bid on the fish fresh off the boat.

EDIT: Looks like the next thread down goes into this. It is flash frozen to kill the parasites, usually on the boat.

Pieter Hintjens (the ZeroMQ guy) died from bile duct cancer which he put down to parasites acquired after eating sushi in South America.

https://en.wikipedia.org/wiki/Pieter_Hintjens

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