2, crab gills: two rows of "small fan" after opening the crab shell, two rows of gray fan-shaped soft tissue on the crab are crab gills. Crab gills are the respiratory system of crabs and are not suitable for eating.
3. Crab heart: the "hexagonal disk" under the black film? Chinese medicine often says that crabs are extremely cold, and crab hearts are the most important. The crab heart is a white hexagon, which is generally located under a black film in the crab heart.
4. Crab intestine: a black crab intestine, the crab stomach leads to the crab navel, which is located in an expandable triangle under the crab abdomen. Open the triangle and you can see a black line connecting the top of the crab.
Extended data:
First, choose crabs.
1, check the connection between the limb and the body.
The feet of fresh crabs are closely connected with the body, so the feet will not droop when lifting crabs. The stale crab will obviously relax at the rotatable place where the limbs meet the body. When you lift the crab by hand, you can see that the limbs (feet) sag downward.
2. Look at the "stomach print" above the navel.
Crabs mostly feed on humus. After a period of death, the stale contents of the crab's stomach will rot, and black marks will appear on the crab's belly and navel.
3. Is the crab "yellow" solidified?
The substance called "crab yellow" in crabs is where many internal organs and reproductive organs are located. When the crab is in the zombie stage, the "crab yellow" solidifies. Stale crabs are semi-fluid. The crab body becomes thinner when it deteriorates, and it can feel the flow in the shell when it turns over.
Step 4 look at the gills
Fresh crabs have clean gills, clear gills, white or slightly yellowish brown. The gill filaments of stale crabs began to rot and adhere, but it was not observed until the shell was peeled off.
Second, the following people are not suitable for eating crabs:
1, patients with digestive tract diseases, such as diarrhea, stomachache, chronic gastritis, duodenal ulcer, cholecystitis, gallstones, etc. ;
2. Patients with liver and kidney diseases, especially those with active hepatitis and hepatic and renal insufficiency;
3. Gout patients;
4. Patients with cardiovascular diseases such as hyperlipidemia and hypertension;
5. Allergic people, especially those who are allergic to seafood.