Which crab has three points on its shell?

Red swimming crab, also known as Three-point Crab, Three-Eye Crab, Red Swimming Crab, Sea Crab, Water Crab, Meretrix meretrix Crab, Clam Crab, and Crab Crab, has a spindle-shaped breastplate with a slight bulge and three obvious warty protrusions on its surface. Claw feet are developed, with long prismatic joints and blunt teeth on the inner edge. The knuckles of the fourth pair of walking feet are flat, wide and thin as paddles, suitable for swimming, and the red swimming crab belongs to warm bottom crab.

It is worth noting that Portunus trituberculatus is in the ocean, and its survival rate is greatly reduced after leaving the high-salt and high-oxygen environment. The biggest difference with river crabs is that although the survival rate of sea crabs is low, Portunus trituberculatus, which died in a short time without giving off peculiar smell, can still be eaten by people. It is rich in nutrition and delicious as fresh.

Extended data

Use Portunus crab tips

1. The gills, sandbags and internal organs of crabs contain a lot of bacteria and toxins, which must be removed when eating;

2. Pay attention when choosing crabs: they must be alive and flexible. After the crab is turned over by hand, it can be turned over immediately. A good river crab can keep spitting and making noises.

3, crab meat is delicious and nutritious, but dead crabs are not suitable for eating; Because crabs like to eat decaying materials such as animal carcasses, they often carry pathogenic bacteria and toxic substances in their gastrointestinal tract. Once they die, these bacteria will multiply.

Crab also contains more histidine, which is easy to decompose and can produce histamine and histidine-like substances under the action of decarboxylase. Especially when crabs die, histidine decomposes faster. The longer the crab dies, the more histidine accumulates in the body. When histidine accumulates to a certain amount, it will cause poisoning.

Baidu Encyclopedia-Portunus rubra