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 prevents the growth of bacteria and other microorganisms, which can spoil the food.
• Salting is a method of preserving food by adding salt. Salt draws out moisture from the food, which inhibits the growth of bacteria. Salt also adds flavor to the food.
• Smoking is a method of preserving food by exposing it to smoke. The smoke contains chemicals that kill bacteria and other microorganisms. Smoking also adds flavor to the food.
• Fermentation is a method of preserving food by converting carbohydrates into alcohol or acids. This process inhibits the growth of bacteria and other microorganisms. Fermentation also adds flavor to the food.

All of these methods are effective in preserving fish. The best method to use depends on the type of fish, the desired flavor, and the storage conditions.