Small whitebait is widely distributed in the eastern coastal waters of China and the estuaries of major river systems, and it is one of the important economic fish in China. These areas include both freshwater environments (such as rivers and lakes) and environments close to the ocean (such as estuaries and tidal zones). According to different living environments, small whitebait can adapt to life and reproduction in freshwater ecosystems, and also has the ability to adapt to coastal or semi-salty and semi-freshwater environments to a certain extent.