As the saying goes, "autumn wind rises, crab feet itch; chrysanthemums bloom, smell crabs come", autumn has always been a more suitable season for eating crabs in the folk.
Yangcheng Lake, Taihu Lake, Hongze Lake, Wuchang Lake and other freshwater lakes are rich in crabs in China, and in autumn, there will be many food lovers who come to visit.
As we all know, depending on the growth environment of crabs, crabs are also divided into river crabs and sea crabs.
It is often said that dead crabs cannot be eaten, is this saying applicable to both river crabs and sea crabs?
Today I will take you to a thorough understanding!
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In terms of color, river crabs are generally blue-green, while sea crabs will be colorful.
In terms of body size, river crabs are generally smaller, while different species of sea crabs vary greatly in size, but they tend to be larger than river crabs.
From the claws, the first pair of river crabs will have fine fluff on their feet, so river crabs are also called Chinese river crabs, while sea crabs have rougher but no fluff on their cray feet.
In terms of the shape of the back shell, the back shell of the river crab is square or oval, and the shape looks very round, while the back shell of the sea crab is diamond-shaped and angular.
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The biggest difference between river crabs and sea crabs is that dead sea crabs can be eaten, but dead river crabs cannot be eaten, even if they are just dead.
River crabs grow in the silt of rivers or lakes, and its living environment is very suitable for the growth of bacteria, so this leads to the number and variety of bacteria on the body of river crabs. The flesh of the river crab is soft and rich in protein, so this also provides favorable conditions for the growth and reproduction of microorganisms.
After the river crab dies, the bacteria in its body will multiply in large quantities, decomposing the protein to produce histamine, and the longer the river crab dies, the more histamine accumulates in its body. Histamine on the human body has the effect of dilating capillaries and constricting bronchi, if people eat the river crab that has died, it will produce symptoms of histamine poisoning, such as flushing, dizziness and headache, rapid heartbeat, chest tightness, shortness of breath, blood pressure drop, etc., asthma patients will also relapse asthma, severe cases may also appear shock or even death.
In addition, eating dead river crabs can also cause Bacillus cereus and Vibrio parahaemolyticasis food poisoning, which can also pose a great threat to health.
The sea crab lives in the seawater, which is a high-salt environment, which will inhibit the growth of bacteria, so the bacteria on the body of the sea crab are relatively small. Moreover, as soon as the sea crab is fished out, it is easy to die, so it will be frozen in time for storage. As long as the sea crab is frozen in time, even if it is dead, it can be eaten, but the storage time cannot be too long, and if the sea crab has died for more than half a month, it is not recommended to eat it.
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Although the crab is delicious, it should be noted that some parts cannot be eaten.
1. Crab cheeks.
After opening the crab shell, there will be two "small fans" with gray-white hairs on both sides, which look soft and spongy, which are the gills of the crab. Like the function of the gills, the crab's gills are also the organs used by crabs to breathe, which can help crabs filter some impurities into the water, so the gills will easily contain heavy metals and dirty things. Therefore, when eating crabs, the crab gills should be removed.
2. Crab stomach and crab intestines.
Both the crab stomach and the crab intestine are the digestive organs of crabs. The crab stomach is hidden in the crab yellow, which is a small triangular bag, and the crab intestine is a black line that connects the crab stomach and the crab navel. As the digestive organ of crabs, crab stomachs and crab intestines are naturally what crabs eat and digest metabolites, which may contain a large amount of sediment and bacteria, which may adversely affect the health of the human body.
3. Crab heart.
The crab heart is hexagonal in shape and is often referred to as a crab hexagonal plate. To know that the heart is the organ that pumps blood, and the blood composition of crustaceans and humans is relatively different, therefore, may lead to the occurrence of some immune reactions, so the crab heart is cold, is the "coldest" part of the whole crab, for people with bad stomach, after eating the crab heart is very prone to abdominal pain and diarrhea and other symptoms.