الفهرس 
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Abstract
Basa is a type of white fish native to Southeast Asia. It is rich in high
quality protein and healthy fats like omega-3 fatty acids, and low in
calories like other types of white fish, so it is exported to many countries
all over the world in the form of a large frozen fillets pieces with no
bones. Therefore, the freezing process is used to preserve them.
Freezing is considered as one of the most common methods of food
preservation. As that lowering the temperature for foods and converting
the moisture in food into ice, lead to inhibit microorganism growth,
stopping the growth of more than 99% of the types of bacteria which
cause food contamination, stopping the rotting process, and lead to
slowing down many chemical reactions that may occur through enzymes
present in foodstuffs. The shelf life of a food can reach more than 12
months, if it is frozen and kept at a temperature of -18°C. In the 20th
century, quick freezing was found to be especially effective with certain
types of food. where the food is exposed to a stream of air at a very low
temperature from 0°C to -5°C or less, in a period of no more than 2 hours,
and then frozen to -18°C. Which leads to turns a small amount of the
water inside the food into very small crystals from ice, which maintains
the quality and the food structure, this is unlike slow freezing.