The adult crab is about1.5-2.5g, that is, 75-1.25g.. There are many kinds of crabs, of course, the weight will be different. For example, the largest king crab, the North Pacific, is by far the largest king crab caught by people, weighing about 33 pounds (about 30 kilograms) and probably the heaviest crab in the world. Such a big crab is enough for a family of five to eat for a week.

Crabs are crustaceans of arthropods, with different species, different nutrients and different weights. For example, the leg length of Japanese crab is 1 m, and its body is like a huge plate. A crab produced in Europe is also its giant brother. Its size is slightly smaller than that of Japanese cancer, its carapace width is 12.5 ~ 25 cm, its interspecific extension distance is10.5 m, and its weight is 7 kg. This kind of crab is more like shrimp. It is called crab because of its shape, and its shape is created by the corresponding living environment. Modern taxonomy has classified them into a special family of stone crabs, which are caught as seafood every summer and can be processed into delicious canned crab meat.