Apparatus for defrosting fish comprises a bath with a sloping base and an exit section with a grill for removing contaminants, divisions between its walls, perforated transport belts for blocks of fish and forced-circulation systems for the defrosting water. Consumption of defrosting water caused by constantly removing froth from the surface is reduced by a vertical guide mounted along the side of the transporter, its lower end below the water surface, and a vertically adjustable valve mounted on the partition which dewater the foam.

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