Shimaaji is one of my all time favorite Japanese fish, very smooth in flavor and is best eaten raw. If you must cook, do so on a coal hibachi or grill, dust with a little chili powder and salt. Striped Horsemackerel and Striped Jack is part of the Aji/Horsemackerel-Saurel family. Even though it is in the mackerel family the flavor is more delicate then the majority of its brothers and sisters. There is a good amount of fat and is best eaten in the winter but is still a excellent fish in the summer.