1. Methods of fish thawing
Thawing between Heated plates

2. Introduction
Thawing is a process whereby heat is introduced into the frozen product. Thawing can be divided into two broad classes.
1. Those which depend only on the conduction of heat through the thawing material.
E.g. thawing in air, thawing in water and thawing between heated plates.
2. Those which do not depend on the conduction heat through the thawing material.
E.g. Dielectric thawing and electric resistance thawing.

3. Continuous
Continuous air-blast thawers have been built in two designs. Cross flow and parallel flow.
Water thawing
Immersion
Thawing of whole blocks in water has been shown to give good results. Product can be as high in overall quality and suitable for processing.
b. Spray
Hygienic condition is maintained in the thawer.

4. Thawing between Heated plates
Dielectric thawing
The frozen material is placed in a high frequency electrical field between two flat metal plates. Heat is produced in the electrically charged particles in the food.
Electric resistance thawing
It is difficult to achieve even heating unless the item is homogenous and regular in shape.
Vacuum thawing
The advantages of this method of defrosting are that with the exception at a vacuum pump there are no moving parts, hence the possibility of mechanical breakdown is reduced compared to the previous methods.