1. Crab stomach: a "triangle bag" hidden in crab roe. When I opened the crab shell, I saw some crab roe on the shell, and the crab stomach was hidden in the crab roe. Crabs have a dirty stomach and are not recommended.

2, crab gills: after two rows of "small fans" open the crab shell, two rows of gray fan-shaped and soft tissues 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 plate" under the black film Chinese medicine often says that crabs are extremely cold, and crab hearts are the most. The crab heart is a white hexagon, which is generally located under a black film in the crab heart.

4. Crab intestine: black line from crab stomach to crab navel. The crab intestine is located in a triangle that can be opened in the lower abdomen of the crab. Open the triangle and you can see a black line connecting the top of the crab.