When it comes to cold water freshwater fish, goldfish must be mentioned. Goldfish is cultivated by crucian carp, which has a long history of feeding in China. It is not only numerous in species, but also different in color. It is usually divided into four species, namely grass species, dragon species, culture species and egg species, among which grass species is the most common and best goldfish, but now more popular egg species.

Koi and carp are related, so they also belong to cold water freshwater fish, and they are easy to raise. Because of its large size, the fish tank should have enough space to ensure that it can swim and turn in the tank. Its feeding habits are very miscellaneous, there are many things to eat, and the requirements for water quality are not high, so it is a good ornamental fish.

Tangyu, also known as Baiyun Jinsi, is a unique fish species from southern China, which has been extinct in the wild at present, but there are still artificially raised species. Although it is located in the south and the water temperature is relatively high, it has strong cold resistance, so it is also a cold-water freshwater fish, and its size is relatively small, so it is not difficult to raise it.

Medaka is a new ornamental fish bred in recent years. Its size is small and its requirements for water temperature are not high, so it belongs to cold water freshwater fish. Different from many conventional ornamental fish, it is mainly viewed from the back, not from the side. Because of its strong suitability for water quality, it can live without oxygen, so it is very easy to raise.

National fighting is also Chinese fighting fish, which is divided into two kinds, one is fork-tailed fighting fish and the other is round-tailed fighting fish. Among them, the fork-tailed betta fish lives in the south of China, which has certain requirements for environmental temperature, while the round-tailed betta fish is in the north, which belongs to cold water freshwater fish and is easier to raise.