Fishing · 7 days freezing · Advanced
Eating Fish Raw: What Freezing Actually Does
Raw freshwater and saltwater fish carries worms and flukes. FDA's parasite-killing freezing schedules are specific, and 'it sat in the snow overnight' is not one of them.
This is for educational purposes only. Not professional medical, electrical, or safety advice.
Warning
Do not eat fish raw because it 'looked clean' or was soaked in citrus. If you cannot hold the verified temperature for the full hold time, cook it instead.
- 01
Know what is in raw fish
Raw or undercooked fish can transmit Anisakis and other roundworms, fish tapeworms and flukes. These are parasites of the flesh, not surface dirt you can rinse away.
- 02
Use a real schedule, not a guess
FDA's parasite-destruction freezing schedules are: hold fish at −4°F/−20°C or below for 7 days total; or freeze at −31°F/−35°C or below until solid and hold at that temperature for 15 hours; or freeze at −31°F/−35°C or below until solid and then hold at −4°F/−20°C or below for 24 hours.
- 03
Admit when your equipment cannot do it
These are controlled processes. A thick fish, a half-empty chest freezer that cycles, or a snow bank that thaws in the afternoon invalidates the assumption. If you cannot verify the temperature and the hold time, you have not frozen the fish to schedule.
- 04
Cooking is the field default
Freezing does not eliminate every other food-safety hazard. Cooking to 145°F/63°C internally is the practical default when you are not certain of your freezer.
- 05
Drop the folklore
Lemon, vinegar or citrus juice does not make raw fish safe. Pulling out one visible worm does not mean the flesh is parasite-free. Smoking and salting do not automatically sterilize fish.