Is supermarket fish safe for sushi? The honest answer
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The short version: sushi grade and sashimi grade are marketing terms with no legal definition in the United States. What matters is whether the fish was frozen properly, so the only useful question at the counter is: was this frozen, and is it intended to be eaten raw? If you cannot get a confident yes, cook it. Cooked sushi is genuinely good.
This is the question I get more than any other, and most answers online are either falsely reassuring or needlessly frightening. Here is what I actually believe, having made a lot of sushi at home.
Sushi grade means nothing legally
There is no US regulation defining the term. Any shop can print it on any label. When a good fishmonger uses it they usually mean something real, which is that the fish was handled and frozen to a standard suitable for raw consumption. When a supermarket uses it, it may mean only that somebody decided to write it.
So the label is not the thing to rely on. The handling is.
What actually makes raw fish safer: freezing
The main concern with raw fish is parasites, and freezing is what addresses it. FDA guidance for fish intended to be eaten raw is to freeze it at minus 4 degrees Fahrenheit for seven days, or at minus 31 degrees for about 15 hours, which needs commercial equipment. A domestic freezer usually cannot reach or hold those temperatures, so freezing it yourself at home is not a reliable substitute.
Most tuna sold for raw consumption is handled differently, and certain tuna species are treated as lower risk for the parasites that rule targets. Worth knowing, not worth relying on alone.
Freezing does not address bacteria. That is what cold chain and freshness are for, which is why how the fish has been kept still matters.
The one question to ask
Walk up to the counter and ask: is this intended to be eaten raw, and has it been frozen for that purpose?
A good fishmonger answers immediately and specifically. A shrug, or an answer that is really about freshness rather than freezing, is your answer. Buy something else, or buy it and cook it.
Buy it the day you eat it
Whatever you buy, use it that day. Keep it cold on the way home, in the coldest part of the fridge when you get there, and do not leave it sitting out while you make rice. Make the rice first, then unwrap the fish.
Some people should skip raw fish entirely. Public health guidance in the US advises against raw or undercooked fish during pregnancy, and for young children, older adults, and anyone with a weakened immune system. If you are cooking for a group, it costs nothing to make half the rolls cooked, and nobody has to announce anything at the table.
Cooked sushi is not a consolation prize
Some of the best rolls have no raw fish in them at all. Cooked shrimp. Smoked salmon. Crab. Tamago, the sweet folded omelette. Roasted sweet potato, which is far better than it sounds. Cucumber and avocado, which is what half of Japan actually eats on a weeknight.
If you are making sushi for the first time I would genuinely suggest starting cooked. You learn the rice and the rolling without also managing a food safety question, and the result is still sushi.
Start with the technique, not the fish. Our free step-by-step guide uses cucumber and avocado for exactly this reason.
Sushi Making Kit on Amazon $23.99 · 4.3★ from 293 ratings · profit pays for the care of FreemanQuestions
Does sushi grade fish mean anything?
Not legally. There is no US regulation defining sushi grade or sashimi grade, so the term carries whatever meaning the seller gives it. Ask instead whether the fish is intended for raw consumption and whether it has been frozen for that purpose.
Can I freeze supermarket fish at home to make it safe for sushi?
Generally no. FDA guidance for fish eaten raw involves temperatures and holding times that most domestic freezers cannot reach or maintain, so home freezing is not a reliable substitute for commercial treatment.
Who should avoid raw fish?
US public health guidance advises against raw or undercooked fish during pregnancy, and for young children, older adults and anyone with a weakened immune system. Cooked fillings are a straightforward alternative.
What can I use instead of raw fish?
Cooked shrimp, smoked salmon, crab, tamago omelette, roasted sweet potato, or simply cucumber and avocado. All are genuinely sushi, because sushi is defined by the rice rather than the fish.
This is general information rather than food safety advice for your particular situation. If you are unsure about a specific fish, ask your fishmonger or cook it.