How does a small fish predict the weather?

Small fish can feel the change of air pressure in water, because fish are cold-blooded animals. When the air pressure is low outside, the temperature will rise, and small fish will move frequently and consume more oxygen. In water, because the weather is hot and dissolved, fish will float because of lack of oxygen. When the air pressure becomes higher, the temperature will drop, and the activity of fish will decrease. Generally, fish will sink to the bottom of the water and their activities will decrease. When fish are active and foraging around, the weather is usually good.