Scomber japonicus, commonly known as the Japanese mackerel, is a species of fish found in the western Pacific Ocean. It is characterized by its streamlined body, which can grow up to 40 centimeters in length. This fish is known for its distinctive blue-green coloration on the back and silver stripes along its sides. The Japanese mackerel is an important species for commercial fishing and is often caught for its rich flavor and high oil content. It is commonly used in various cuisines, particularly in Japanese cuisine, where it is served grilled or as sushi.