Crab yolk is crab egg. It contains a large number of nutrients such as protein, fat, phospholipids, vitamins, etc., which are essential for human body, and is rich in nutrition. Can be made into many delicacies: crab porridge, crab bean curd, etc. Crab yellow is the top grade with bright color, orange or deep yellow, clean and free of impurities, fresh taste and sufficient dryness. Crab yolk is oily and should be sealed and preserved.

Male crabs have seminal vesicles, and the white substance in them is sperm, and the sperm of male crabs is crab paste.

Crab paste may also be fat. Because in order to prepare for the winter, the male crab gradually accumulates fat and grows into crab paste (commonly known as crab oil). Peeling off the shell of the male crab, you can see that there is something white and sticky in the crab shell and crab lump, which is crab paste (crab oil). When cooked, the crab paste becomes translucent. The more crab paste, the stronger the male crab.

In the wild environment, in September of the lunar calendar, the crab roe of the female crab grows the most plump; In October, the crab paste (crab oil) of male crabs grows thickest. Therefore, in the past, eating crabs was said to be "nine females and ten males". It means: we should eat female crabs in September and male crabs in October.