Fish preservation techniques in Manipur include:

The correct answer is: All of the above.

Fish preservation techniques in Manipur include drying, salting, smoking, and fermentation.

• Drying is a method of preserving food by removing water. This can be done by sun drying, air drying, or oven drying. Drying helps to prevent the growth of bacteria and other microorganisms that can spoil food.
• Salting is a method of preserving food by adding salt. Salt draws water out of the food, which helps to prevent the growth of bacteria. Salting also helps to enhance the flavor of food.
• Smoking is a method of preserving food by exposing it to smoke. The smoke helps to kill bacteria and other microorganisms, and it also adds flavor to the food.
• Fermentation is a method of preserving food by converting carbohydrates into acids or alcohol. This process helps to prevent the growth of bacteria and other microorganisms, and it also adds flavor to the food.

All of these methods are effective in preserving fish, and they are all commonly used in Manipur. The best method to use will depend on the type of fish being preserved, the desired flavor, and the availability of resources.