I used to buy the "Su Crab Pavilion" Yangcheng Lake Hairy Crab Voucher, and there are precautions for eating crabs on the attached fold.

1 Crab stomach-Crab stomach, commonly known as crab monk and crab urine bag, is wrapped in the middle of crab yellow, and is shaped like a triangular small black block.

2 Crab gills-Crab gills, commonly known as hairy crabs and crab eyebrows, are the respiratory organs of hairy crabs. On both sides of the front of hairy crabs, there are two rows of soft things like eyebrows.

3 Crab heart-Crab heart, commonly known as hexagonal plate, is located in the middle of crab yellow, next to crab stomach.

4 Crab intestine-The crab intestine is located in the middle of the crab's navel, in a strip shape, and it is a black line from the crab's stomach to the crab's navel.

When eating hairy crabs, there are only four things that crabs can't eat, because they contain bacteria, viruses and sludge. Referred to as "four don't eat"

I hope it helps you.