Can you freeze sushi?
Yes you can. It may not taste as good when you defrost it, but you can freeze it if you must. Sashimi (raw fish) can easily be frozen and thawed and still maintain the same taste and "freshness". It's actually required that sashimi be frozen and thawed prior to serving to kill parasites.
Sushi, especially the raw fish in sashimi, can be easily contaminated. Sushi restaurants have to follow strict ordinances for food safety to prevent this. You don't have to worry about it at established sushi restaurants because if a sushi restaurant were to sell contaminated sushi the health department would shut them down.
Yes it does but not all sushi has fish in it. "Sushi" is the art of the preparation and the presentation. Tamago, for example is a cooked egg omlet of sorts that is specially seasoned and placed on the formed rice ball in sushi preparation for what is called "nigiri" sushi. And not all sushi contains raw fish. The eel, or Unagi is cooked as is the shrimp. Sashimi is sliced raw fish. Sushi rolls…