The crab is the common name for the crustacean crab. It is a very large number of species, there are two or three hundred species in our country, edible crabs are also quite a lot of, the city often crowned pike crabs, green crabs, Japanese python and river crabs (Chinese city crabs) are edible crabs. Crabs are found in offshore and shallow waters, as well as in freshwater and semi-saline water. Depending on the water they inhabit, they can be divided into two categories: sea crabs and river crabs. Crab meat is tender and flavorful, and can be used to make a variety of delicious dishes. The fat of male crabs, the eggs of female crabs, and the snow-white and tender muscles inside the oval-shaped crabs are especially appreciated by people. What is the nutritional value of crabs? Nutrient-rich box contains a certain amount of protein, fat, carbohydrates (cheese), water, minerals and antibiotics and other nutrients. According to research every 100 grams of edible part of the sea crab contains 14 grams of protein, 5.9 grams of fat, 7 grams of carbohydrates, 71 grams of water, 0.129 grams of calcium, phosphorus 0 .145 grams of iron 0.013 grams of A push antibiotics 5960 international units, push biotin Bl (thiamphenicol) 0.03 milligrams, push biotin B, (Riboflavin) 0.71 milligrams, niacin 2.7 milligrams. River crabs contain the same kinds of nutrients as sea crabs, but less than the former (except calcium and phosphorus). According to analysis, the crab is also very rich in iodine, with 660 micrograms of iodine per kilogram of dried sea crab. Crab roe (eggs) also contains a variety of antibiotics and digestive enzymes (proteolytic enzymes and starch glycolytic enzymes).