There are spikes on both sides of the shell of swimming crab, but there are no spikes on both sides of the shell of hairy crab.
The difference between legs
Hairy crabs have hairy claws on their forelegs and no paddles on their hind legs. Portunus crab has a round hind leg for paddling.
The difference between shells
There are spikes on both sides of the shell of swimming crab, but there are no spikes on both sides of the shell of hairy crab.
The difference between legs
Hairy crabs have hairy claws on their forelegs and no paddles on their hind legs. Portunus crab has a round hind leg for paddling.
Eriocheir sinensis is an economic crab, also known as river crab, hairy crab, clear water crab and hairy crab. It is a famous food in China. Its claws are used for foraging and resisting enemies, and the inside and outside edges of the palm are densely covered with fluff, hence the name Eriocheir sinensis. Omnivorous animals, such as fish, shrimp, snails, mussels, worms, earthworms, insects and their larvae, can all be used as animal feed for hairy crabs.
Crabs contain more vitamin A, which is helpful for skin keratinization. It can also supplement calcium for rickets in children and osteoporosis in the elderly. Lakes are widely distributed in the north and south coastal areas of China, among which the Yangtze River system has the largest output and extremely delicious taste. Among them, Gucheng Lake Hairy Crab is the most famous, which has always been called the crown of crabs, and has been recognized as a well-known trademark in China by the State Administration for Industry and Commerce. Other famous hairy crabs are Taihu Hairy Crab, Yangcheng Hairy Crab and Changdang Hairy Crab.
Nutritional value of hairy crabs
Hairy crabs are rich in nutrition. According to Compendium of Materia Medica, crabs have the functions of relaxing muscles and tendons, invigorating qi and regulating stomach, promoting digestion, dredging meridians, clearing heat and removing blood stasis. Crab meat is salty and cold, which has the functions of clearing heat, removing blood stasis and nourishing yin, and can be used to treat traumatic injury, tendon injury and fracture, allergic dermatitis, etc. Crab shells are calcined and mixed with honey. External application can treat wasp sting or other nameless swelling. Crab meat is also a natural tonic for children. Regular consumption can supplement high-quality protein and various trace elements.
Crab meat contains many vitamins, among which vitamin A is higher than other terrestrial and aquatic animals, vitamin B2 is 5-6 times higher than meat, 6- 10 times higher than fish and 2-3 times higher than eggs. The content of vitamin B 1 and phosphorus is 6- 10 times higher than that of common fish. Every 65438 000g edible part of hairy crabs contains 65438 07.5g of protein, 2.8g of fat, 65438 082mg of phosphorus, 65438 026mg of calcium and 2.8mg of iron. Crab shell is not only rich in calcium, but also contains crab red and crab yellow Traditional Chinese medicine has a long history of understanding the medicinal value of crabs. "Fun Life Recipe" records "nourishing bone marrow, nourishing liver yin, nourishing gastric juice, nourishing tendons, promoting blood circulation and astringing gangrene". Modern Dictionary of Traditional Chinese Medicine says that its main functions are: "clearing away heat, dispersing blood, continuing injuries, treating bone and muscle injuries, scabies, lacquer sores and burns".
As we all know, crabs are delicious. And this delicious taste comes from the nutritional value of crabs. In the edible part of crab, every 100g contains 80g of water, 2.6g of fat, 0.7g of carbohydrate, 0. 14 1g of calcium and 0. 19 1g of phosphorus.
Hairy crabs are also rich in a substance called astaxanthin, which belongs to carotenoids and is the main pigment of crustaceans such as shrimp, crab and salmon. It is reddish brown powder with melting point of 224℃, insoluble in water, soluble in most organic solvents such as ethanol and propylene glycol, and easily damaged by light, enzyme, heat and oxide.
Swimming crab, commonly known as "white crab" in some places. Because the breastplate is spindle-shaped, it is named spindle-shaped. There are three protrusions in the center of the crustacean, so it is also called "Portunus trituberculatus" and belongs to arthropods. The male umbilical cord is smooth, the claws are long, and the shell surface is blue; The female umbilical cord is round and fluffy, and the shell surface is ochre or spotted. Portunus trituberculatus has delicious meat, high nutritional value and economic value, and is suitable for temporary cultivation and fattening in seawater. The head and breastplate are spindle-shaped, and the width is almost twice as long; The surface of the head and breastplate is covered with fine particles, with 2 lateral ridges and 3 verrucous protrusions; There are two sharp teeth on the forehead; There are 9 sharp teeth on the front side edge, and the back teeth are long and prickly and protrude outward. The pliers are thick and longer than the breastplate of the head. The long section is prismatic, the male long section is slender, and there are four spikes in the front edge.
nutritive value
Portunus is tender and white, rich in protein, fat and various minerals. Swimming crabs are the strongest in winter, generally weighing about 250 grams, up to 500 grams. The red mud of the female crab is covered and tastes excellent. Swimming crab can be eaten fresh, steamed, fried or fried, or stewed in bean paste, or fried with crab to make rice cakes, pickles and tofu, which are common dishes on the table of residents in coastal areas. It can also be pickled, that is, the fresh Portunus trituberculatus is soaked in brine and can be eaten in a few days, commonly known as "fresh wind catching crabs". In the past, due to the high yield of Portunus trituberculatus, fishermen often chose live crabs covered with paste, put yellow in bowls, and let them solidify in the wind, rain and sun to become "crab yellow cakes", with excellent flavor, but low yield, which is difficult for ordinary people to taste.