It's very cold. Is the crab still crawling when it is cold in autumn?

When the weather is cold, aquatic organisms will dive into deep water and reduce their activities, and generally will not go ashore.

This is because the temperature in water is higher than that in air. As long as the water is not completely frozen, the bottom of the water can be kept at about 4 degrees, and the temperature can be reduced below zero. Only when the temperature is high in summer and autumn, because the heat capacity ratio of water is greater than that of air, when the temperature drops at night, the temperature drops faster than the water temperature, and then it will go ashore.

Living habits

A small number of crabs grow and breed completely in fresh water, and most of them live under rocks in mountain streams. There are also a few crabs, such as ground crabs, which can adapt to land life, make holes in wet mud holes and migrate to the sea when breeding. Most crabs are omnivorous. Some crabs are carnivorous. For example, Portunus can prey on fish, shrimp and mollusks. A few crabs, such as window crabs, scrape or filter algae and organic debris.