Why do crabs foam, why do crabs foam Reasons why crabs foam

Crab foaming is caused by its unique way of breathing. The crab breathes with its gills, its gills are hidden under the jacket, like a sponge, it can suck in a lot of water, it can live on land by the water in the gills, and the water flow in the gills will flow back into the body from the bottom of the chelicerae after the oxygen is consumed, and when the water flows through the body, the fresh oxygen will melt in, so the crab can breathe in the water like a fish.

However, after a long time, the water in the gills will gradually decrease, and the crab will twitch its mouth and gills in an attempt to absorb the water, but it will suck in a lot of air, and the air will mix with the water in the gills, forming many bubbles.

Crabs store a lot of water in their gill plates, and when they leave the water, they can still breathe incessantly, inhale a lot of air, and spit it out from both sides of their mouthparts. Because it sucks in too much air, the gills and air come into contact with a large area, and the water contained in the gills is exhaled together with the air, forming countless bubbles, which pile up more and more, and form a lot of white foam in front of the mouth.

Living by the sea, going to the beach or buying new crabs at home often see crabs foaming at the mouth, why is this?

Crab is a crustacean that lives in water, so it breathes with gills like fish, but the position of the gills of the crab is different from the position of the gills of the fish, the position of the gills is on both sides of the head of the fish, and the gills of the crab are located on both sides of the back of the crab, and the proportion of the body is relatively large, and the gills have many sponge-like things, and the back is wrapped with a hard shell, when the crab lives in the water, all parts of the basic body are absorbing fresh water from the water, and there is water-soluble oxygen in these waters, Crabs use the capillary network of gills for gas exchange, absorbing fresh oxygen and releasing exhaust gases and water.

Therefore, it is said that crabs foaming in the water is a phenomenon of respiration, but crabs sometimes live on land or on sand and rocks, and they will also foam at this time, why is this?

It turns out that although crabs live most of the time in the water, they sometimes go to the land to find food, and they also have a strong ability to resist drought, which comes from the foam they spit out. Crabs store a lot of water in their gills, and once they leave the water, they release the water stored in their gills in the form of foam in order to keep their bodies moist and breathe properly. When they absorb a large amount of air, the water in the gills comes into contact with the air in large quantities, and when they exhale excess air and exhaust gas, they will also bring out some water, which will form the white foam we see the crab exhale, and as the foam expands and bursts, it will also make a rustling sound.

Although crabs have a certain ability to resist drought, crabs are aquatic creatures after all, and they still need to ensure the amount of water.

1. Crab foaming is caused by its unique way of breathing. Crabs store a lot of water in their gills, and when they leave the water, they can still breathe incessantly, inhale a lot of air, and spit it out through the sides of their mouthparts.

2. Because it inhales too much air, the gills and air contact area is larger, and the water contained in the gills is spit out together with the air, forming countless bubbles, which are piled up more and more, and a lot of white foam is piled up in front of the mouth.

Crab is a delicious food with high nutrients that is loved by people. But you know what? Crabs are very aggressive small animals in the water and are not easy to catch.

I don't know if you have noticed that when we buy crabs, we will see crabs spitting out a lot of white foam, why is that? I believe that many friends don't know much, so let me answer your doubts.

Crabs are crustaceans in the phylum Arthropod, belonging to the same category as shrimps, with a hard shell on the outside. Like fish, it breathes with gills, but the gills of crabs are different from those of fish in that they are not born on the sides of the head, but on both sides of the back of the body. The gills of crabs are made up of many gill pieces that are soft like a sponge, and are covered with a hard carapace.

When we eat crabs, peel off the outside. With a hard shell, you can clearly see the gills on both sides. Crabs suck in fresh water from the base of the chelicerae and foot, which brings dissolved oxygen from the water into the capillaries of the gills.

The treated water flows through the gills and is spit out from both sides of the mouthparts.

Fish can't live without water, but crabs that also live in water can leave the water for a short time and crawl to land in search of food, because crabs have large spongy gills that can store a lot of water. As a result, even if it is temporarily out of the water, it is still able to breathe normally for a period of time, except that instead of inhaling dissolved oxygen from the water, it will inhale oxygen directly from the air. As a result of inhaling a large amount of air, when the crab exhales the air next, it will bring out the water contained in the gills, and countless bubbles will naturally form.

The longer the crab breathes on land, the more foam accumulates and looks like it came out of its mouth.

Obviously, the foam is formed by the mixture of water and air that originally remained in the gill pieces, so it is impossible to spit out for a long time, so you will find that the crab that leaves the water spits bubbles is actually a process from less to more, and back to less.