How do you kill parasites by freezing them?

Chef's answer
In general, killing parasites requires freezing and storing fish at a surrounding temperature of minus 4 degrees Fahrenheit or colder for seven days.
Frequently asked Questions 🎓
Put a plug into the clam to keep it open. Like the grafting process, extracting the pearl without killing the oyster requires putting in a plug to hold the shell apart. Cut the oyster and use tweezers to remove the pearl. Remove the plug and allow the oyster time to recover before grafting with the oyster again.
A few more cooking questions 📍