How do fish predict the weather?

The solubility of gas in water is related to air pressure and temperature. Temperature and air pressure are two important parameters of weather change.

Before it rains, the air pressure is relatively low, and there is less dissolved gas in the water, which affects the gas exchange of fish. Therefore, there are proverbs such as "the fish jumps out of the water, the wind and rain are coming" and "the fish plays with flowers by the river, and it rains in the sky".