Biological classification: Black snapper belongs to Perciformes, Sparidae, and saury belongs to Pinctada and Bambusoideae. There are obvious differences in biological classification between them.
Ecological habits: Cyprinus carpio is a pelagic fish, which moves on the surface and feeds on small fish, shrimp and crustaceans. Saury is a benthic fish that moves underwater. Its staple food is shrimp, crab and small fish. In terms of body shape, herring is long and slightly flat, and saury is short and round.
Distribution: Green mackerel is distributed in the western North Pacific Ocean, including the Sea of Japan, the Yellow Sea and the East China Sea. Saury is mainly distributed in the North Pacific Ocean, west to the Sea of Japan, north to the Bering Sea and east to the coastal areas of Mexico.