What is the suitable temperature for keeping goldfish?

Goldfish are cold water fish, not tropical fish. If the water temperature is high, it will die. In winter, if the water is deep enough (above 80 cm) and there is enough oxygen, there is no problem at 4℃ above zero, which means that the fish has entered a state similar to hibernation. Generally, the suitable water temperature for goldfish is 20-30℃, the most suitable temperature is 23-25℃, it can be kept at 15-25℃ in winter, the minimum spawning temperature should be 16-22℃, and the temperature difference of water exchange should be within 4℃.

Although goldfish is an omnivorous fish completely domesticated by human beings, it is the same as other fish such as crucian carp. Whether the feed selection is reasonable and the feeding is correct can directly affect the growth and development of goldfish, the depth and brightness of color, the appearance and fullness of traits, the number of eggs laid, the hatching rate and the disease resistance of goldfish. Therefore, the feed for goldfish must be rich in protein, fat, carbohydrates, vitamins and a certain amount of inorganic salts and trace elements. For example, if other conditions are the same, feeding enough fresh red worms every day will lead to great growth and development, especially the characteristics of lion head and blisters (referring to sarcoma and blisters), which may be the reason why red worms contain a lot of animal proteins, fats, carbohydrates and other rich nutrients.

It is best to feed with 0.5% saline. There is chlorine in tap water, so it should be exposed to the air for half a day to remove chlorine, or washed with commercially available neutralizing solution or vitamin C candy for four to five times to neutralize toxicity. [2] There are many harmful substances in well water, so we should also pay attention to them.

In addition, among goldfish breeders, there is also a breeding method called "green water", which controls the number of phytoplankton and algae in the water tank to keep the water a little transparent green tea color. Using phytoplankton in edible water can make goldfish more colorful and alleviate the drastic change of water quality when changing water. However, if it is not properly managed, the excessive reproduction of phytoplankton will make the green water too thick and easily cause goldfish diseases.