Why can loach predict the weather?

The most common fish in the genus Misgurnus. The whole body is slippery, the back and sides are gray-black, the whole body is covered with small black spots, and there are big black spots at the tail handle. Small eyes, five pairs of tentacles around the mouth. Misgurnus likes to live on the still bottom of the water. Western Europeans call loach climate fish. The weather is sultry. Before it rains, there is a serious lack of oxygen in the water, forcing the loach to scurry up and down, just like performing a dance in the water, which is a precursor to heavy rain. ......

I carefully checked the relevant information and found the real reason: before it rained, the weather was sultry, the water lacked oxygen, and the loach jumped up and down to breathe the air.