This is a yellowtail ( Japanese amberjack ) sashimi.
Name of yellowtail in Japanese changes as it grows up.
Actually, the name of the fish are diffirent with size.
We usually call yellowtail "Buri" when it is more than 80cm long.
Buri is oily and has rich taste.
Especially, It is very oily and delicious in winter.
Buri is good for sashimi.