Abstract: A plurality of smoke injection needles are inserted into or then withdrawn from tuna meat while bubbles of smoke are ejected from the smoke injection needles at intervals. The smoke is produced by burning a smoking material and containing carbon monoxide (CO) gas. The bubbles of the smoke are thus dispersed and injected into the tuna meat, and the residual CO concentration in the tuna meat is thereby set at 1100 to 2400 ?g/kg. The resulting smoked tuna meat M is preserved in frozen storage at about ?18°C.

Abstract: A plurality of smoke injection needles are inserted into or then withdrawn from tuna meat while bubbles of smoke are ejected from the smoke injection needles at intervals. The smoke is produced by burning a smoking material and containing carbon monoxide (CO) gas. The bubbles of the smoke are thus dispersed and injected into the tuna meat, and the residual CO concentration in the tuna meat is thereby set at 1100 to 2400 mg/kg. The resulting smoked tuna meat M is preserved in frozen storage at about −18 ° C.

Abstract: Raw fish and meat are smoked to sterilize and prevent decomposition and discoloration without losing their freshness. The smoked fish and meat pick up agreeable taste and flavor, and remain as wholesome as fresh ones when kept at easily obtainable cold-storage or freezing temperatures, even during long transportation. The smoke generated by burning a smoking material at 250.degree. to 400.degree. C. is passed through a filter 22 to remove tar. The smoke retaining ingredients, exerting highly preservative and sterilizing actions passed through the filter 22, are cooled to between 0.degree. and 5.degree. C. in a cooling unit 3. Fish or meat is processed by exposure to the smoke at the extra-low temperature thus obtained.