Because crabs breathe by their gills, after leaving the water, the water in the crab’s gills will decrease, and the crab will inhale a large amount of air, which will form air bubbles after mixing with the water in the gills.
When many people go to the aquatic market to buy crabs, they often find crabs spitting bubbles inside their mouths, why do crabs spit bubbles? Let’s find out together below.
Although the crab lives in the water for a long time, its body structure is different from that of the fish. Even if the crab leaves the water, it will not dry to death.
Crabs rely on gills to breathe, but the gills of crabs and fish gills completely different. The gills are made up of many gills, which grow on both sides of the body and are protected by a thick shell.
If you go to the vegetable market to buy crabs, you should choose crabs that spit foam in your mouth, because crabs that spit foam in your mouth means that the crab is fresh.
Most crabs live in the sea or offshore areas, and only a few crabs live in freshwater areas or on land.
A very small number of crabs live in fresh water all their lives. Crabs have a mixed diet, eating both meat and seaweed.