Lake Dali is a barrier lake on the plateau formed by volcanic eruptions  Like salmon living in the sea, Hua Zi fish-Leuciscus waleckii, which lives in a brackish lake, must migrate to the upper reaches of the Tanshui River to spawn and breed, although the four rivers currently flowing into Lake Dali are inland rivers, and none of them leads to the sea
Scientists are still convinced that the Huaziyu in Lake Dali first migrated from the ocean
The caught Hua Zi fish can only survive for a day or two after being put into sea water or fresh water, and will decay quickly after death.