Why do live crabs spit out colored stickiness

The crab spits bubbles, which is caused by its unique way of breathing. The crab breathes with its gills, its gills are hidden under its jacket, like a sponge, it can suck in a lot of water, and it can live on land with the water in its gills. The flow of water in the gills is drained of oxygen and flows back into the body from the bottom of the chelicerae.

As the water flows through the body, fresh oxygen melts in. So the crab can breathe as if it were in the water. But as time went on, the water in the cheeks gradually decreased.

At this time, the crab will twitch its mouth and gills in an attempt to absorb water, but it will inhale a large amount of air, and the air will mix with the water in the gills, forming many bubbles.

The brown paste in the crab is the stomach of the crab, also known as the crab urine bag, and cannot be eaten.

Located on the anterior edge of the dorsal shell**, the crab urine bag is a small bone bag shaped like a triangle with dirty sand inside, which is close to the crab roe. Generally, when the crab is on an empty stomach, the stomach will appear smaller, and after a full meal, the stomach will swell, and it will look like there is more black gelatin, but this belongs to the normal category, and it can be eaten normally after removing the black gelatin.

Crabs belong to the class Mollusk, Decapod, and are crustaceans whose bodies are protected by a hard shell and breathe by gills. Taxonomicly, it is the same animal as shrimp, lobster, and hermit crab. The vast majority of species of crabs live in the sea or near the sea, but some inhabit freshwater or land.

The resources of Chinese crabs are very rich, among which the hairy crabs produced by Gucheng Lake, Taihu Lake, Gaoyou Lake, Yangcheng Lake, Xilou Hairy Crab, Xinghua Hairy Crab and Hongze Lake Hairy Crab in the lower reaches of the Yangtze River are the top quality.

1. The crab spits out the yellow liquid because the crab is excreting bad impurities from the body, and the crab spits bubbles due to its unique breathing mode.

2. Crabs are gill respirators like fish, but the difference is that fish respiration is to suck water into the mouth and then let the water pass through the gills. Crab breathing, on the other hand, is to suck water out of the gills and then squirt water out of the outlets on both sides of the mouth.

It's the digestive matter, the crab spits butter, it's better not to eat it.

The brown paste in the crab is the crab gills, crab stomach, crab intestines, etc. The crab gills are two rows of soft things that grow on the belly of the crab and resemble eyebrows, which are brown when accompanied by the tour, and are the respiratory organs of the crab, which are mainly used to filter the miscellaneous liquid, and are inedible. Both the crab stomach and crab intestine have crab excrement and cannot be eaten.

The brown paste in the crab is the crab gills, crab stomach, crab intestines, etc. The crab gills are two rows of soft things that grow on the belly of the crab, like eyebrows, which look brown, and are the respiratory organs of the crab, mainly used to filter impurities. Both the crab stomach and crab intestine have crab excrement and cannot be eaten.

1. Crab foam is to moisten its gills when breathing.

2. Crabs are crustaceans that live in water, breathing with gills born on both sides of the body, and the surface of the crab's gills is covered by a hard head and breastplate. When the crab lives in the water, it sucks in fresh water from the base of the chelicerae and foot, flows through the gills and spits out from both sides of the mouthparts.

3. The gill of the crab stores a lot of water, so it can breathe without water, inhale a lot of air, and spit out the water from both sides of the mouthparts. Because it inhales too much air, the gills are in contact with the air in a large area, and the water contained in the gills is exhaled along with the air, forming a foam to moisten its gills.