Question 1: How long does it take to eat dead crabs? You can eat dead sea crabs as long as they have not deteriorated, but you cannot eat dead hairy crabs. Sometimes when you see that a hairy crab has stopped moving or bubbling, you can move its eyes. If its eyes have stopped moving, you can pick it up and see if its legs are drooping. If the legs are drooping, we call it Leg crabs are usually dead at this time. There is another way to make a final judgment, which is to slightly open its shell and see if the heart on its back is still beating. If the heart is not beating anymore, please discard it decisively! ! !

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Question 2: Why can’t we eat dead crabs? When a crab is dying or dead, the histoxic acid in the crab’s body will decompose to produce histamine. Histamine is a poisonous substance. As the death time prolongs, more and more histamine accumulates in the crab body, and the poisonous gas becomes more and more powerful. Even if the crab is cooked, this toxin is not easily destroyed. Excessive ammonia nitrogen must be excreted from the kidneys, so eating dead hairy crabs is very harmful to the kidneys. People who eat dead crabs may experience symptoms such as vomiting, abdominal pain, and diarrhea. Even half-dead "leg crabs" are not suitable for consumption. The infection rate and degree of metacercariae of Paragonimus larvae in live crabs is very high. Paragonimus parasitizes in the lungs, destroys or destroys lung tissue, can cause coughing, and even hemoptysis. If it invades the brain, it can cause paralysis. . According to expert inspections, if crabs are slightly heated and eaten, the rate of paragonimiasis infection is 20%; if crabs are eaten pickled and drunk, the rate of paragonimiasis infection is as high as 55%; and if crabs are eaten raw, the rate of paragonimiasis infection is as high as 71%. Paragonimiasis metacercariae are very resistant and generally need to be soaked in water at 55°C for 30 minutes or soaked in 20% salt water for 48 hours to kill them. Eating raw crabs may also cause symptoms such as intestinal inflammation, edema and congestion. Therefore, eating steamed and cooked crabs is the most hygienic and safest. When steaming crabs, you should pay attention to boiling them for at least 20 minutes after the water boils. Only when the crab meat is cooked thoroughly can the germs in the crab meat be killed. One thing is also very important. When eating, you must remove all four substances: crab gills, crab heart, crab stomach, and crab intestines, because they contain bacteria, viruses, sludge, etc.

Is this okay?

Question 3: Why can you eat frozen crabs? Dead crabs cannot be eaten. Generally, frozen crabs are edible from the sea, but dead crabs cannot be eaten from lakes or rivers. Freshwater crabs produce toxic substances after death, which are harmful to human health after being eaten.

Question 4: It is said that dead crabs cannot be eaten, so do crab claws count? Why are there so many things to eat and sell? 5 points is also because after some seafood is dead, eating it will cause diarrhea, so the price gap between dead and alive is often very large

Question 5: How long does it take to eat crabs after they are dead? 1. Crabs cannot be eaten after they die.

2. To determine how long the crab has been dead, check whether the bottom ring of the crab shell is white. The larger the white area and yellow spots, the longer the crab has been dead. There are also crabs that have lost their claws, which means that they will die soon.

3. Preservation of crabs after purchase:

The first method is to sprinkle a small spoonful of salt in a deep-bottomed container, which can be stored for 12 to 24 hours. This method is also It can make the crab vomit out the dirty things in its belly.

The second method is to sprinkle some white sesame seeds in the safe box at the bottom of the refrigerator (for their consumption), which can also be stored for a long time.

In addition, if the crab starts to foam in the water, it means that its survival time is not long and it should be eaten as soon as possible.

Question 6: How long can crabs be stored? How long will it take to die without eating? Bundle it well and put it in the fresh-keeping compartment of the refrigerator (do not freeze). It can be kept for more than 10 days. Do not keep it for too long as it will consume nutrients. It’s best not to eat dead seafood, as it will ruin your stomach. If the crab has been dead for a long time and it smells stale and fishy, ??then it cannot be eaten. When you usually buy fresh crabs, cook them first and store them in the refrigerator. Never put raw crabs in the refrigerator, because then the meat inside the crabs will be gone.

Question 7: Why can’t you eat dead river crabs but can eat sea crabs? You must not eat dead crabs after you buy them.

Crabs are scavengers with extremely strong immunity. They eat a lot of bacteria and viruses, but they are all suppressed by the crab's immunity. Once the crab dies, it is not even dead, just about to die. , bacteria and viruses will multiply in large numbers and produce some biological toxins.

Because crabs like to eat decaying substances such as animal carcasses, their gastrointestinal tracts often carry pathogenic bacteria and toxic substances. Once they die, these bacteria multiply in large numbers; in addition, crabs also contain a lot of histidine, which can easily Decomposition can produce histamine and histamine-like substances under the action of decarboxylase. Especially when the crab dies, histidine decomposes more rapidly. As the crab dies longer, more histamine accumulates in the body, and When histamine accumulates to a certain amount, it will cause poisoning. So as long as you see a crab that is half dead and lacks energy, it is best not to eat it.

If people eat such crabs, they will be seriously affected by food poisoning, dehydration, electrolyte imbalance, convulsions, and even shock, coma, sepsis, etc. Common symptoms include nausea, vomiting, abdominal pain, and diarrhea.

Some people may ask, after cooking the crabs, aren’t the crabs still dead? Aren’t they still eating dead crabs? Why can’t you eat crabs that are naturally dead?

There is a difference in this. If the crab dies naturally, the toxins in the body will double, and these toxins will also decompose the crab meat. For crabs that are cooked by themselves, the toxins in the body have been excreted. , and also after high temperature, which effectively prevents the spread of bacteria and better kills bacteria.

And after the water is boiled, boil it for another 20 minutes, so that the germs in the crab meat can be killed. Crabs taste very delicious, but if they are improperly preserved and cause death, they will still Send it directly to the trash can, for your own health and the health of your family.

Although crabs are rich in nutritional value and there are many things to pay attention to when eating crabs, you must not eat dead crabs. Do you understand more after reading the introduction? If you are a crab lover, you should keep in mind the precautions for eating crabs to avoid affecting your health.

How to choose crabs: Live crabs spit bubbles when leaving the water

After being caught, crabs often try to break free, which causes an increase in lactic acid in the body, which can cause bacteria in the body after the crab dies. Multiply rapidly and spread into crab meat. Bacteria will decompose the amino acids in crabs, and then produce a harmful substance "histamine", which can cause allergic food poisoning; another substance that may be produced is "histamine-like", which can cause vomiting, abdominal pain, and diarrhea, so pay attention when choosing .

When buying crabs, you must buy them alive, because dead crabs contain a certain amount of toxicity, which is very harmful to our health. Because when the crab is dead, the histidine in the crab's body will decompose to produce toxic histamine. The toxins produced by the crab will continue to increase with the time of death. Therefore, when buying crabs, you must choose live ones.

When selecting, you can lightly press the shell surface next to the crab's eyes with your fingers. If the crab's eyes move immediately, it means it has abundant vitality. You can also place your fingers between the crab claws. If the crab claws are strong, It means that the crab has strong vitality. Also, if the crabs spit out foam after leaving the water, they are live crabs, so you can buy them with confidence.

It is easy to distinguish between male and female crabs. We turn the crabs upside down. The one with a triangular belly is a male, and the one with a round belly is a female.

However, experts can tell just by looking at the legs. The female crab has a gray and black ball of hair on its claws, but not elsewhere. The male's eight legs also have fine hairs arranged like brushes.

How to preserve live crabs if you can’t finish eating them

The principles of preservation are to keep them motionless, at low temperature, away from light, and moisturized. When the room temperature is high, especially in September and October, the crabs should be bundled and packed tightly.

Soak the outer packaging to the extent that no water drips, and place it in the cold room of the refrigerator. Instead of the whole package, cover the tied crabs with a wet towel and store at a temperature of 5-10°C.

Preservation method one: Store hairy crabs in the refrigerator. Tie the legs of the hairy crab with the hairy crab to reduce the physical exertion of the hairy crab, then place it in the freezer of the refrigerator, cover it with a wet towel, and store it for more than seven days.

Preservation method 2: Preserve Yangcheng Lake hairy crabs in plastic buckets/pots. Put the hairy crabs in it - don't stack them; then add water to half the height of the hairy crabs - mainly for moisturizing, you can't bury all the hairy crabs, because you are unlikely to have oxygenation equipment, and if the water is too deep, the crabs will lack oxygen. Death from suffocation. There is no need to cover the pot/bucket. Check the hairy crabs every day and eat the hairy crabs with insufficient vitality in time. Using this method to preserve Yangcheng Lake hairy crabs, the hairy crabs can be preserved for more than 5 days when the temperature is not high.

It can be seen that dead crabs cannot be eaten, and crabs must eat cooked crabs, otherwise it will be harmful to health... >>

Question 8 : What should I do with dead river crabs? Can I eat them? The crabs that have not been dead for a long time can be eaten, but you must clean them up and cover them (i.e., cover the navel part of the crab with a small piece). Male crabs and female crabs have different shapes. ), remove the crab lid; use a small spoon to scoop out the crab stomach part in the middle, and gently suck the crab roe wrapped around the outside clean. Be careful not to break the triangular cone-shaped crab stomach in the middle, which should be discarded; use scissors to cut off the excess crab legs, crab mouth and crab lungs; use the handle of a spoon to remove a hexagonal piece in the middle of the crab body. Pick out the crab heart part and discard it.

(People with allergies will have reactions when eating dead or alive ones, this is relatively rare)

Question 9: How long does it take for crabs to die before you can eat sea crabs as long as they have not deteriorated? You can eat them, but you can’t eat the dead hairy crabs. Sometimes when you see that a hairy crab has stopped moving or bubbling, you can move its eyes. If its eyes have stopped moving, you can pick it up and see if its legs are drooping. If the legs are drooping, we call it Leg crabs are usually dead at this time. There is another way to make a final judgment, which is to slightly open its shell and see if the heart on its back is still beating. If the heart is not beating anymore, please discard it decisively! ! !

Accept it

Question 10: How long can crabs be stored? How long will it take to die without eating? Bundle it well and put it in the fresh-keeping compartment of the refrigerator (do not freeze). It can be kept for more than 10 days. Do not keep it for too long as it will consume nutrients. It’s best not to eat dead seafood, as it will ruin your stomach. If the crab has been dead for a long time and it smells stale and fishy, ??then it cannot be eaten. When you usually buy fresh crabs, cook them first and store them in the refrigerator. Never put raw crabs in the refrigerator, because then the meat inside the crabs will be gone.