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Player2 said:

It kills any anisakis (a common parasite among marine mammals and fish) the fish might have.

So does cooking your food. I would personally suggest simply not utilizing raw fish in your home cooking and if you do, I would buy pre-frozen sushi grade fish instead of freezing the fish yourself (for the reasons previously stated). Also worth noting, the FDA recommends freezing below -20C for seven days if killing parasites is your goal, which may be lower than your home freezer.