Discuss the important commercial methods used for preservation of fish to prevent the growth of micro-organisms.

Fish is a perishable food item, and it has a high moisture content which makes it an ideal substrate for microbial growth. Therefore, preserving fish is essential to ensure its safety and quality. The commercial methods used for preserving fish are designed to prevent the growth of microorganisms, inhibit enzymatic activity, and prevent lipid oxidation. In this answer, we will discuss some important commercial methods used for preservation of fish to prevent the growth of microorganisms.

1. Refrigeration: 
Refrigeration is the most common and widely used method for preserving fish. The temperature of the fish is lowered to 0-5°C, which slows down the growth of bacteria, yeasts, and molds. This method is particularly useful for preserving fresh fish and shellfish, and it is also used for preserving smoked and cured fish. However, refrigeration is not a long-term preservation method and requires proper handling, storage, and transport conditions to prevent spoilage.

2. Freezing:
Freezing is another commonly used method for preserving fish. The temperature of the fish is lowered to below -18°C, which inhibits the growth of microorganisms and slows down enzymatic activity. This method is particularly useful for preserving fish for longer periods and for transportation to distant markets. Freezing can be done by air blast freezing, contact plate freezing, or cryogenic freezing. However, the quality of the fish may be affected by the formation of ice crystals during freezing.

3. Canning:
Canning is a popular method for preserving fish in which the fish is cooked and then sealed in airtight containers. The heat treatment kills the microorganisms present in the fish and prevents their growth. This method is particularly useful for preserving fish for long periods and is also convenient for storage and transportation. Canned fish is available in various forms such as tuna, salmon, and sardines.

4. Drying:
Drying is a traditional method for preserving fish, which involves the removal of moisture from the fish by air or sun drying. The low moisture content inhibits the growth of microorganisms and enzymes, and the fish can be stored for long periods. Dried fish is a popular product in many cultures and is used in various dishes such as soups, stews, and curries.

5. Smoking:
Smoking is another traditional method for preserving fish in which the fish is exposed to smoke and heat from burning wood or other materials. The ____ ____ ___ ________ __________ _______ _________ _________ ____.
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