"Sushi-grade" isn't a grade
There is no federal definition of sushi-grade or sashimi-grade. It's a market term that means the seller trusts the fish to be served raw, usually because it was frozen to the FDA's parasite-destruction standard along the way. What you're really buying is a vendor with a cold chain they're willing to stand behind.
Buying: what to look for
- A fishmonger who answers questions. Ask when it came in, whether it was previously frozen, and whether they'd eat it raw. Hesitation on any of the three is your answer.
- Sensory checks. The fish should smell like clean ocean water, not "fishy." Flesh should look glossy and firm, springing back when pressed, not holding a fingerprint.
- Whole fish over pre-cut. Cutting surfaces multiply with every hand that touches the fish. A whole fish you break down yourself has the shortest history.
- Timing. Buy the day you're serving. If you must buy ahead, ask for fish packed on ice and keep it at the back of the coldest part of your fridge.
The freezing rule, in plain terms
For raw consumption, the FDA's parasite-destruction standard is freezing at -4°F for 7 days, or -31°F until solid and holding for 15 hours. Nearly all "sushi-grade" fish sold commercially has been frozen this way already. Farmed salmon, raised on feed that breaks the parasite cycle, is generally considered lower risk than wild salmon, which carries a higher parasite load. Tuna is the classic low-parasite wild option.
Handling at home
- Keep it cold, always. Between the fridge and the cutting board, the fish should spend no more minutes at room temperature than necessary. Work with it straight from the fridge, not after a counter thaw.
- Dedicated board and knife. One board, one knife, for the fish only. Wash your hands before and after. Cross-contamination from raw-protein handling is a bigger practical risk at home than parasites.
- Sharp knife, long strokes. A dull blade tears the flesh and mashes the cell walls, which shows in the texture the moment it hits your tongue. Slice against the grain in single pulling strokes.
- Serve cold, eat soon. Once sliced, back into the fridge until it hits the plate. Sushi is a same-day food.
Who should skip it
Raw fish is off the list for pregnant women, young children, the elderly, and anyone with a compromised immune system. Cooked sushi rolls are the easy workaround, and honestly, nobody at the table tracks who ate what.