The present invention comprises the steps of thawing frozen fish; Enzymatic treatment of the juiced citron to obtain a hydrolyzate; Preparing an immersion solution containing citron hydrolyzate, vinegar, and refined sa Filleting the thawed fish; slicing the fish; immersing the fish in an immersion solution containing a hydrolyzate of citron; It relates to a processing method of fish in which the generation of fishy smell is suppressed and the microbial growth on the surface of the fish is suppressed, comprising the steps of dehydrating the immersed fish; and freezing the dehydrated fish.
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