Perhaps it is just a coincidence, but all the techniques that are ideal for eliciting umami were discovered and perfected as methods for preserving foodstuffs that are quite perishable. This is particularly true for fish, but also for meat and milk products. While conserving them is simply a tool to ensure that they will keep, it often changes them beyond recognition. What is important is whether they are still edible and have kept, or even increased, their nutritional value.
First you Add Salt
Almost all preservation pro cesses involve adding salt. For example, in the case of curing, fermenting, or smoking meat, the meat is initially salted to draw out liquid. At the same time, the salt inhibits the growth of undesirable bacteria and fungi.