Co-treated tuna loins refer to tuna fish that have undergone a special processing method known as CO treatment or carbon monoxide treatment. In this process, carbon monoxide (CO) gas is used to treat the surface of the tuna loin. The CO gas combines with the myoglobin in the fish to create a bright red color, giving the tuna a fresher appearance and masking any discoloration that might occur as the fish ages. Co-treated tuna loins are often used in the food industry, particularly in sushi and sashimi preparation. The bright red color of the tuna can make it look more appealing and appetizing.
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