Sturgeon and koi fish should be oxygenated in winter and fed to sturgeon. According to relevant data, the wintering period in koi fish is 1 1 until next March. The dissolved oxygen of water will increase with the decrease of temperature, and the oxygen consumption of fish will decrease with the decrease of temperature. When it is cold, it will not be stuffy in the tank, so there is no need to increase oxygen and reduce the feeding amount. In polyculture, sturgeon needs food and oxygen in winter, and the fish tank should be oxygenated and fed in winter.