The crab has eight legs, eight legs run wild, and eight homophonic pronunciations. So jade carving crab means making a fortune. Secondly, the jade carving crab also symbolizes wealth and prosperity from all directions. Crabs turn red when cooked, so jade carving crabs symbolize good luck. If you want to give crabs to your friends, you want them to be richer.
Crab farming:
The ancients often used "crab yellow", "fat paste" and "tender jade" to describe the delicacy of crabs. This refers to different parts of crabs. "Crab yellow" is a strip-shaped purple-brown leaf ovary in the female crab (which turns yellow after cooking); "Paste" refers to the colorless transparent colloidal seminal vesicle of male crab, which is orange-red after cooking and is known as "amber in the chest".
"Tender jade" refers to the pincer meat, that is, the white and tender crab meat in the shell is as fat as jade. As for describing the crab as "spitting pearls", it is the foam formed by carbon dioxide and water when the crab breathes in the water, which is clear and transparent, which just proves that this crab is a living thing.