Post 90s crab farmers pick crabs and only look at the penultimate leg! What s the secret?

Through the second leg, you can see whether the crab is fat or not, and you can see how much crab paste this crab has, so you can pick the crab in this way.

Because the penultimate leg of the crab has the least meat, if the meat is relatively full, it is a good crab. Not the other way around.

In this way, the health status of the crab can be well identified. The ripeness of the crab can also be seen.

Crabs have ten legs. Crabs are crustaceans of the class of crustaceans that consist of a head, torso, and tail with a hard shell on the outside of their body. The legs of crabs usually come in pairs, and they are used to walk and grab prey.

A pair of legs of a crab usually evolves into giant pincers, which are used to catch prey or as a defensive tool.

In addition to walking and grabbing prey, the crab's legs have other functions. During mating, males use their last pair of legs to catch females. In the lower part of the crab's body, there are small holes to breathe, and these breathing holes are directly connected to the blood vessels, while the crab's first few pairs of legs act as ventilation pipes, directing the gas into the inside of the crab's body.

Interestingly, one of the crabs' pincers is often larger than the other, which is the result of their asymmetrical development during growth. In addition, different species of crabs have different shapes and functions in their legs. For example, some marine biologists believe that the killer mantis shrimp, or the long-armed shrimp known as the octopus shrimp, may have two mimetic legs in the front to catch prey, while the back legs are used to move.

To sum up, crabs usually have ten legs. These legs all play an important role in walking, grabbing prey, ventilation, and mating. In addition, the crab's pincers can also be used for defense and attack.

Different species of crabs also have different kinds of legs, which have evolved and adapted to their living environment. <>

Crabs have ten legs.

1. Crab Introduction:

螃crab (páng xiè): Animalia, phylum Arthropods, Crustacea, Molluscs, True Softnails, Decapods, Ventral Embryos, Brachycda. It is a crustacean whose body is protected by a hard shell and breathes by its 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. They rely on the mother crab to give birth to baby crabs, and each time the mother crab lays a large number of eggs, the number of which can reach more than millions.

Crabs rely on the geomagnetic field to determine direction. The history of Chinese crab eating is long, and it is recorded in "Yi Zhou Shu, Wang Hui Jie" and "Zhou Li, Tianguan, Baoren".

The genetic material of such organisms is complex and highly varied, often as many as more than 100 pairs. Common crabs include hairy crabs (river crabs, hairy crabs, clear water crabs), pike crabs, etc. China's crab resources are very abundant, 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.

2. Body type: Although the crab is small, it has all kinds of organs. When the hard shell of the crab is removed, we can find that the crab's body parts are protected by a layer of shells, shield-like shells that biologists call carapace.

The crab thoracic cavity has five pairs of appendages called thoracopods. The pair of appendages in front of them have strong chelae that can be used for foraging, and the other four pairs of appendages are the feet of the crabs, and the crabs rely on these four pairs of appendages to walk and move, and they walk in a unique and interesting way, mostly walking sideways rather than straight forward. The exception is monk crabs, which walk straight.

Crabs have 8 legs.

2 pliers. I grew up eating crabs.

"Crab six kneels and two claws, there is no one who can be placed on the cave of the snake and the snake, and the heart is restless"--Xunzi Persuasion" Xunzi or descendants have recorded an error! In fact, the crab should be an eight-legged two-chela, give you the ** of the river crab in our Erli River Crab Breeding Base, count it yourself.

Hello dear!

Crabs have 10 legs (including 2 large pincers).

I grew up watching crabs.

The crab should be eight legs and two hands.

River crabs are based on the criterion of freshness, and the following tricks should be mastered to select river crabs:

1) Look at the color.

The shell of the fresh live crab is blue-black, shiny, full umbilicus, and white abdomen; The shell of the dying crab is yellow, and the crab legs are soft, making it difficult to straighten out.

2) Look at the eyes.

Touch its eyes with your hands, and quickly retract into the eye sockets and can't touch it at all, and vice versa.

3) Look at chelicerae.

1 pair of pliers (large claws) is indispensable, because the missing foot may have a flesh texture due to the wound, and the plump will also be worse due to physiological effects.

4) Look at vitality.

Turn the river crab over, with the abdomen facing the sky, and can quickly turn back with chelicerae, which has strong vitality and can be preserved; If it can't be turned back, the vitality is poor, and the storage time can't be long.

5) Look at the fullness.

To see the plumpness of the river crab, first open the navel of the river crab, as long as it shows egg yolk, it means that the river crab has a lot of crab roe; If it is white, it means that the crab is less plump. In addition, under the sun, see if the edge of the river crab cover is transparent, if not, the crab meat is fatter, otherwise it may be empty, and it will be full of water when cooked.

Teach you three tricks to pick out fresh hairy crabs?

Look at the crab shell: the back of the shell is black-green with bright light, and the meat is thick and strong; The back of the shell is yellow, and most of them are thin.

Look at the navel: the navel is protruding, and the whole is full of fat; Most of the concave ones are underweight.

Look at the chelicerae: all the chelicerae are covered with fluffy bushes, and they are all chelicerae; The chelicerae have no villi, and the body is soft.

Look at the vitality: turn the crab over, the abdomen is facing the sky, can quickly use the sting foot to bounce back back, the vitality is strong, can be preserved; If it can't be turned back, the vitality is poor, and the storage time can't be long.

Look at the male and female: the lunar calendar.

Female crabs are selected in August and September, and male crabs are selected after September, because the male and female crabs have mature gonads at these two times, and the taste and nutrition are the best. By carefully studying and referring to these "five looks", you can select high-quality crabs from among the many crabs.

Four tips for quickly identifying the good and bad of crabs:

1. Whether the hand is falling: it does not sink in the hand.

2. Press the claws with your hands to check whether the meat of the crab is dry and clean.

3. Whether there is enough crab paste, the tail end of the crab is full or bulging.

4. If the crab paste is bright and the crab navel will be red on both sides (commonly known as "red marks" in the industry), it is a good crab.

Ten normal crabs have a pair of pincer-like feet to burrow, defend and attack, called chelicerae; The other four pairs of feet are all used for walking or paddling, and are called footsteps. Chelicerae and gait do not function the same.

Therefore, strictly speaking, the crab should have eight legs that can walk, and two chelicerae that do not have the ability to walk.

Crabs are all eight-legged, and if they have six legs, they are a mutant variety, so it's best to go to your local fisheries service center and ask if you can eat them.

Hello! 6 impossible to put?! Generally, crabs have 8 legs, plus two large claws, regardless of sea crabs or lake crabs. I really haven't seen 6 legs, where can I ask you where they are?

10, The book says very clearly: crab (pángxiè): animal kingdom, phylum arthropods, crustacea, decapods, reptiles.

"Full eye" is very clear, that is, 10 feet, and the first two are also counted as feet.

8, the other two are big ao, not feet.

8, and two are big ao.

The crab has a pair of appendages in front of it with strong chela, which can be used for foraging, and the remaining four pairs of appendages are the crab's feet, and the crab relies on these four pairs of appendages to walk and move, that is, the crab has four pairs of appendages, which means that the crab has eight legs.

Crabs have eight legs.

The crab thoracic cavity has five pairs of appendages called thoracopods. The pair of appendages in front of it have strong chelae that can be used for foraging, and the other four pairs of appendages are crab feet.

Crabs rely on these four pairs of appendages to walk and move, and they walk in a unique and interesting way, mostly walking sideways rather than straight forward.

There is a sentence in Xunzi's "Persuasion": "Crabs kneel six and claws two, and there is no one to sus on the cave of the non-snake eel, and they are also impatient." "Six kneeling refers to the lower leg next to it, and two chelates refer to two large pliers.

The academic community generally believes that one of them"Six"The word is"Eight"Miswording. It was first seen in Li Zhi's "Jing Zhai Ancient and Modern Huang". "Crabs are eight-legged and two-cheled. There is no one in the world who knows everything. And Xun Qingzi said that the crab knelt six and the two claws.

Eight legs. There is a saying in the ancient text: crab six kneels and two chela, six kneeling refers to six legs, and two chela refers to two pincers, which is a saying since ancient times, but it seems to be inaccurate.

My son said that crabs have ten legs, that's for sure. Please adopt the support ...... in a timely manner

Normal crabs have eight legs that can walk, and two chelicerae that do not have the ability to walk. The crab has five pairs of appendages in the thoracic cavity, called the thoracic legs, and the pair of appendages in front of it has strong chelae, which can be used for foraging, and the remaining four pairs of appendages are the crab's feet, and the walking movement depends on these four pairs of appendages, and the appearance of walking is unique and interesting, mostly walking sideways rather than going straight forward.

Crabs have eight legs.

A pair of pincers can be used to dig holes and attack enemies. The remaining four pairs of legs are used for walking or paddling, and are not aggressive.

Crabs have 8 legs, and two large pincers don't count.

Although the crab has 8 legs, based on the fact that the two feet at the tail end of the crab are less involved in walking, a 6-legged lateral moving walking mechanism was developed by imitating the walking style of the crab, and its movement characteristics were studied to meet the requirements of traveling on rigid ground and soft ground involved in agricultural production.