How can a crab not drown How can a boiled crab not die?

The crab is not an amphibian, but it can also live in water and on land. Of course, you can't spend too much time on land, especially not for a long time without water.

The amphibians you are referring to should be amphibians among vertebrates, such as toads, frogs, salamanders, etc. These organisms have some common characteristics, such as larvae live in water and adults live on land. Breathe with **, etc.

Crabs are animals of the class Crustacea of the phylum Arthropod and are invertebrates. It breathes with gills and is therefore suitable for living in water.

I think that the crab uses its gills to breathe, and when you eat crabs, you can see its gills when you open the crab cover.

There are gills, breathe with gills, arthropods.

I ask you how fish can't drown.

Crabs cannot be drowned, it does not drown because it breathes with its gills, so it is able to breathe freely in the water. Not only can it breathe in water, but it can also breathe in air, just with enough oxygen. The gills of the crab can store some of the water so that it can breathe when it comes ashore.

But there is a difference between the gills of a crab and the gills of a fish, and its gills look like filaments.

There are many types of crabs, there are about 600 kinds of Chinese crabs, there are shuttle crabs, blue crabs, frog crabs, Guan Gong crabs, etc., because of the geographical location of the distribution, so there are also grades, the first class is lake crabs, such as Yangcheng Lake, Jiaxing Lake; the second class is river crabs, such as Jiujiang and Wuhu; The third class is river crabs; The fourth class is brook crab; The fifth class is the ditch crab; The sixth class is sea crabs.

Crab farming

1. Sufficient amount of aquatic weeds.

In summer, the crab pond should be stocked with some aquatic plants such as water peanuts and duckweed, or some water-raising plants such as reeds and cocoons should be planted to provide a shady habitat for river crabs. The area of aquatic plants set up or planted in the crab pond generally accounts for about 30% of the entire pond area, too much should be harvested in time, too little should be replenished in time. At the same time, rotten aquatic weeds should be removed in time to avoid spoiling water quality and breeding pathogens.

2. Freshness of water quality.

Crab ponds should be checked frequently, new water should be replaced frequently, leftover food and dirt should be removed in time, and the pool water should be kept clean. The depth of the water body must be maintained at least 1 meter to prevent the hot water from burning the crab body. The water change is generally carried out from evening to 10 a.m. the next day, and the water is changed once every 3 5 days, and the water is about 5 cm deep each time.

The water source must be clean and free of pollution.

During the molting period of river crabs, it is necessary to increase the calcium ion content of the water body, generally 5 10 kg of quicklime per mu of water surface, and splash the whole pool after the water, and splash once every 15 20 days to facilitate the healthy growth of river crabs.

Pot under cold water. Materials.

Ingredients: 1000 grams of crab and a few slices of ginger.

Excipients: 1 tablespoon of salt.

The practice of boiled crabs.

1. First of all, rinse the crab and put it in the pot, and fill it with water just enough to cover the crab.

2. Slice the ginger, no need to be too thin.

3. Then sprinkle with a spoonful of salt.

4. Then cover and cook over high heat.

5. When the water is completely boiling, turn to medium-low heat and continue to cook for 3 5 minutes.

6. Judge the lead to turn off the fire, drain the water and put it on a plate.

7, although this kind of small crab is not big, but it is fat and very delicious, and it is still not good to be a snack in chasing dramas.

Hello dear, it is a pleasure to serve you <>

Crabs have different vital signs from humans, their lungs are in the body, and unlike the way humans breathe, they need to breathe through holes, the so-called gill breathing. Therefore, the crab Bizenki will not drown if he stays in the water for a long time. However, if the crab stays in the water for a long time, the gills will develop fatigue and exhaustion due to lack of oxygen, which can lead to death.

If the crab is languishing in the water, sluggish, or even stagnant, it may be because the situation is not good and it should be moved to a dry place immediately. In addition, it should be noted that when raising crabs, it is not advisable to let the oxygen in the water be too low, otherwise it is easy to cause the death of crabs. In order to maintain the oxygen content in the water body, the way for oxygen to enter the water surface can be increased, such as by adding equipment such as air pumps to increase the oxygen content in the water.

The crabs in early autumn are the fattest, but if you accidentally buy the crabs that are dying or find that the crabs are dead after buying them, how do you save the dead crabs? After steaming the crab, if you can't eat it, how long will the cooked crab be frozen?