May 15, 2015 — Q. Does deep-freezing fish kill harmful parasites?
A. It can if the food gets cold enough and stays that way long enough, according to guidelines for the food industry from theFood and Drug Administration.
For disease-causing parasites like tapeworms, roundworms and flukes, which may infest raw or undercooked fish, freezing can be the answer, but its effectiveness varies. It works best for tapeworms and appears to be somewhat less effective for roundworms and flukes
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