The present invention relates to a fish treatment procedure characterized in that it comprises the following steps: (a) cutting the fish into clean loins, (b) cleaning the fish loins obtained in the previous step, (c) injecting at least one formulation into the clean fish loins, and (d) packaging the fish loins obtained in the previous step by using at least one thermoforming or vacuum packaging machine. Likewise, it is an object of the invention the formulation used in said procedure.
