Hyporhamphus sajori is a mixed species of freshwater and seawater fish, which reproduces in freshwater but grows in seawater. Because of its short growth cycle and rapid renewal of generations, it is very abundant, and it is mainly distributed in China along the Bohai Sea and the Yellow Sea, with the best quality in the Jiaodong Peninsula in places such as Yantai and Weihai.

Hyporhamphus sajori (Temminck et Schlegel, 1846) is a small marine fish in the Hyporhampidae family, commonly known as the stickleback fish, Japanese Hyporhampus sajori, and the frozen needlefish.

The fish is elongated, with a body length of 17 to 24 centimeters. The upper jaw is triangular, equal in length and width, and the lower jaw is extended rostrally. The teeth are small, the body is covered with fine round scales, and there is a wide longitudinal band of emerald green color on the dorsal midline. The dorsal and anal fins are opposite each other, both located at the back of the body, the pectoral fins are high and yellow in color, and the caudal fin is forked and light green in color, with the lower lobe slightly longer than the upper lobe.

There are a variety of common names for the horse mackerel, including the "stick fish" because of its slightly cylindrical shape, and the "needle fish" because of its pointed, needle-shaped mouth. Mostly distributed in the western North Pacific.