Tuna is highly prized by sushi chefs, but quality can vary and the process of checking the fish by hand with saws at the ...

Seafood lovers know the fatty marbling is what makes tuna sashimi and sushi so tasty, so for the industry, it's the fish's ...

Seafood lovers know the fatty marbling is what makes tuna sashimi and sushi so tasty, so for the industry, it’s the fish’s level of fattiness that’s used to judge its quality and pricing.

A conveyor belt transports a whole frozen tuna fish, about a meter (3 feet) in size, into a machine that beams ultrasound waves. Sensors pick up the waves to draw a zigzagging diagram on a screen ...