How do tadpoles report the weather?

This is similar to fish predicting the weather. On sunny days, the atmospheric pressure is high and there is much oxygen dissolved in the water, so tadpoles can stay in the water quietly. Before the rainy weather came, the air pressure dropped and the oxygen in the water was greatly reduced, so we had to float to the surface to breathe. So when you see fish or tadpoles coming out of the water, you know the weather is going to get worse.