Does goldfish need oxygen when the weather gets cold?

Goldfish are ectothermic animals and will adjust their own temperature according to the water temperature. When the weather gets colder, their activities will decrease and they will eat less. However, they do not need oxygen because their metabolism decreases and they have different requirements for oxygen and water quality. Lower the temperature, but be careful not to let the water freeze. Cold nights (below 0 degrees Celsius) should be moved indoors. If you want the goldfish to grow faster, you can move the indoor light to increase the temperature and continue feeding food. Then through a winter If you raise them properly, your goldfish may be larger than those raised outdoors at room temperature, and the survival rate of the hatchlings in spring will be higher than that of goldfish raised outdoors at room temperature.