The amino acid contents of irradiated tuna meat, irradiated steamed fish paste Kamaboko and their extracts were determined by ion-exchange chromatography. These were irradiated with doses of 1.17 and 2.64 Mrad at 3°C (37.4°F). In order to control off-flavor development from irradiated samples, addition of potassium bromate and pyrogallol to samples was examined. Sensory test and determination of two samples added additives were carried out.