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Is the yellow color in the crab with the yolk the crab's feces?

No. Crab feces are concentrated inside the crab intestine; located in the middle of the crab umbilicus of the hairy crab, in the shape of a strip, from the crab stomach to the crab umbilicus of the hairy crab through a black line. Crab roe and crab shit are well distinguished, one in the crab's big shell and one on the butt.

Extended information

Crab yolk: is the crab eggs. It contains a lot of essential protein, fat, phospholipids, vitamins and other nutrients. There are two kinds of crab yolk: river crab yolk and sea crab yolk, with river crab yolk as good, and sea crab yolk with slightly worse flavor.

Crab shit: crab debris are in the crab's stomach (crab shit), steamed crab stomach is white, inedible. The location is under the crab's mouth, which can be seen by moving the crab shell.

Crab is rich in protein and trace elements, and has a good tonic effect on the body. Crab contains more vitamin A, which is helpful for the keratinization of the skin. Crab also has an anti-tuberculosis effect, eating crab on the recovery of tuberculosis is greatly beneficial.

References:

Baidu Encyclopedia - Crab