The quality of tuna determines the taste of sashimi. But how do you know if the tuna is fresh enough? /CFP

A Japanese company developed an AI-based system called "Tuna Scope" that judges the quality of natural tuna using cross-sectional images of their tails. /CFP

Fish merchants traditionally spent a decade learning how to select high-quality tuna. But now, users can download the phone APP and use it anywhere. /CFP

The APP grades the tuna from high to low. The consistency rate between the APP and the professional identification results was 85 percent during testing. /CFP