Is there any necessity to add chemicals to preserve fish? how long it will be fresh?

Most people recommend freezing fish and keeping for up to 1 month but if properly salted it can keep for months. In years gone by people did not have the luxury of fries and freezes and salting was the main recourse for keeping not only fish but meat as well.

I think chemicals is harmful for us. I prefer ice than chemical to preserve fish.

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