Fish is salted and dried to preserve it. This is one of the oldest and best method to preserve food, where water is completely removed which inhibits the growth of microbes. Microbes need water to live and grow. So removing water from the food completely destroys them and adding salt even makes them impossible to live. So this highly nutritive food (Fish) can be preserved and consumed over a longer period of time.seafood | Prawns | shark | Mackerel