One, the crab has a few legs
1, the crab has eight legs, respectively, on both sides of the body, its large pincers are not legs. Normal crabs have a pair of pincer-like feet for defense, digging holes and attacking, called chelipeds, and the remaining four pairs of feet are used for walking or paddling, called steppers. The crab has a pair of tentacles in the center of the forehead, a stalked compound eye on the outside, and a mouthparts that include a pair of large jaws, two pairs of small jaws, and three pairs of jaw feet.
2, a small portion of the crab grows and reproduces entirely in fresh water, mostly inhabiting the mountain streams under the rocks, a few crabs such as the ground crab can adapt to land life, burrowing in moist mud holes, migrating down to the sea during the breeding period. The vast majority of crabs are omnivorous, a few crabs such as the stock window crab is scraping or filter-feeding algae and organic debris, some crabs are carnivorous, such as pike crabs can prey on shrimp, fish and mollusks and so on.
The nutritional composition of crabs
1, per 100 grams of edible part of the crab contains 2.8 grams of fat, 17.5 grams of protein, 126 milligrams of calcium, 182 milligrams of phosphorus, and 2.8 milligrams of iron and rich in vitamin A and vitamin B1.
2, to the saw edge of the blue crab as an example of analyzing the nutrient content, the saw edge of the green crab in the composition of a wealth of proteins, including protein amino acid species, a complete range of protein amino acids.
3, saw edge green crab body is rich in fat and unsaturated fatty acids (UFA), muscle UFA up to 74.58%, DHA 13.52%, EPA up to 18.04%. The unsaturated fat content of saw-edge green crab is high, especially EPA, DHA, ? -3 fatty acid content, liver Ca content is also extremely high, second only to pangasius, stone snail, shrimp, shrimp and clove fish, other essential elements Cu, Zn, Mg, Fe, Mn and other content is also high.