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

A conveyor belt transports a whole frozen tuna fish, about a meter (3 feet) in size, into a machine that beams ultrasound ...

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

KAWASAKI, Japan -- 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 ...

KAWASAKI, Japan (AP) — 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 ...