Introduce fish

Crucian carp (scientific name: Carassius auratus), commonly known as crucian carp, common name crucian carp seeds, moon crucian carp, crucian carp, small head, crucian carp, cold crucian carp, called crucian carp in Cantonese, is a species of the genus Carassius, in the Eurasian region It is a common freshwater fish. Crucian carp can produce many new species through artificial breeding and selection. For example, goldfish is a kind of ornamental fish produced from this, and its named subspecies.