1, crab stomach: hiding in the crab yolk "triangle package" crab stomach where? Open the crab shell, see the shell stained with some crab yolk, crab stomach is hidden in the shell of the crab yolk. The crab stomach is very dirty and should not be eaten.

2, crab gills: two rows of "small fan" After opening the crab shell, two rows of gray fan-shaped soft tissue on the crab body is the crab gills. Crab gills are the respiratory system of the crab and should not be eaten.

3, crab heart: black membrane under the "hexagonal plate"? Chinese medicine often say that the crab is extremely cold, and the crab heart is the most. Crab heart is a white hexagonal, it is generally located in the center of the crab under a black membrane coat.

4, crab intestines: crab stomach through to the crab umbilicus a black line crab intestines are located in the lower abdomen of the crab that can be broken open triangle. When you open the triangle, you can see a black line connecting the top of it to the crab's body.

Expanded information:

I. Selecting crabs

1, check the degree of connection between the limbs and the body

Fresh crabs have tight connection between the feet and the body, and the feet are not loose and sagging when you lift up the crab body. When the crab body is lifted, the feet do not sag. When the crab body is not fresh, there is obvious slackness in the limbs and body where the limbs and body are connected, and when the crab body is lifted by hand, the limbs (feet and feet) can be seen sagging downward.

2, look at the umbilicus above the "stomach seal"

Crab to humus for food bait, after death after a period of time, not fresh crab stomach contents will be corrupted in the crab body ventral umbilicus above the black seal.

3, crab "yellow" is solidified

Crab body is called "crab yellow" material, is a variety of internal organs and reproductive organs. When the crab is in the rigor mortis stage, the "yolk" is solidified. When the crab is not fresh, it is semi-fluid. When the crab body is deteriorating, it becomes thinner, and when the crab body is turned over, you can feel the flow inside the shell.

4, look at the gills

Fresh crab gills clean, gill filaments clear, white or slightly yellowish brown. Not fresh crabs gill filaments began to rot and bonding, but must be peeled off the armor to observe.

The following groups of people are not suitable for eating crabs:

1, patients suffering from digestive diseases, such as diarrhea, stomach pain, chronic gastritis, duodenal ulcer, cholecystitis, gallstones, etc.;

2, patients with liver and kidney disease, especially in the active stage of hepatitis, liver and kidney insufficiency patients;

3, gout patients;

4, patients suffering from patients with cardiovascular diseases such as hyperlipidemia and hypertension;

5, allergic individuals, especially those allergic to seafood.