The preservation of food in the past and the present, when 100 years ago. When catch as to give neighbors to eat thoroughly. Indicate the habit of good people in the past. The rest are maintained by food preservation is the fermentation salt to fish, dried in the sun. หรือย่าง smoked, though in the past. Won"t know the theory principles in the preservation of agricultural products. But I have to practice constantly, for generations, a simple method based on nature, a part of help in preservation. On the contrary. Now when the fish coming to sell to raise money to support the family shows the way of life to survive, because in the present. Everything is trade. When buying has sold, but sales strategies in many forms of fish preservation. Now use the technology to help you. Preservation in the way modern commercial processes most commonly used is the preservation using high demand by yes cooling by drying, for example. Canned fish, frozen fish, fish jerky.