It refers to September and October of the lunar calendar. Because in autumn, the climate gradually turns from cold to cold. In the wild environment, in September of the lunar calendar, the crab roe of the female crab grows the most plump; /kloc-In October, the crab paste (also called crab oil) of male crabs grows thickest. Therefore, eating crabs has the saying "nine females and ten males". It means: eat female crabs in September and male crabs in October.
Extended data:
In September of the lunar calendar, the digestive glands and ovaries of female crabs grow into crab roe to prepare for the winter and the next year's breeding (crab roe turns into crab roe in spring). At this time, when you peel off the crab shell, you can see that there are many yellow sticky things in the crab shell and crab tuo, that is, raw crab yellow. After cooking, the crab roe turns red, and the deeper the red, the thicker the crab roe.
Male crabs will grow slowly until October of the lunar calendar, when the fat gradually accumulates and grows into crab paste. Peel off the shell of the male crab, but what you see in the same place is a white sticky thing, which is crab paste. After cooking, crab paste becomes translucent. The more crab paste, the stronger the male crab.
Crab yolk and crab paste are not only delicious, but also nutritious, and are the essence of crabs. When eating crabs, you must dip in ginger vinegar to get rid of the cold.
Baidu Encyclopedia-Nine Women and Ten Men