Attention should be paid to oxygen first in fish farming in summer. Usually, the rise of temperature will lead to the decrease of dissolved oxygen in water, so that fish are prone to lack of oxygen and may even float their heads. Therefore, in summer, it is best to use oxygen pump for oxygenation. If it was oxygenated in the past, it is necessary to extend the oxygenation time, and it is best to turn it on all day.

The water level not only has certain influence on fish, but also is linked with temperature change in summer. If the water level is relatively low and there is less water, the temperature will easily affect the water temperature, which will lead to the temperature change. If the temperature difference is too large, it will be harmful to the health of fish, so the water level is usually higher in summer.

Besides temperature, illumination will also affect the state of fish. Although the growth of fish needs a certain amount of light, the strong light in summer will not only raise the temperature, but also promote the reproduction of algae, and even cause problems such as algae explosion. Therefore, it is best to keep the fish tank away from light in summer to prevent it from receiving light for a long time.

Because of the high temperature in summer and the rapid reproduction of bacteria and microorganisms, the water quality at this time is not easy to maintain, which will also endanger the health of fish. Therefore, it is necessary to shorten the cycle of changing water, usually changing water once every three days, and not changing too much at a time, so as to avoid the stimulation of new water to fish and stress reaction.