Just crab is cultured in seawater, and just crab and Portunus belong to the same species. Portunus trituberculatus is a kind of marine crab. If it leaves the original high-salt and high-oxygen environment and is cultured in fresh water, its survival rate will be greatly reduced, and even it will die soon. Therefore, it is generally not recommended to cultivate live Portunus trituberculatus in fresh water. It is suggested that 20%-35% seawater can be prepared to preserve Portunus trituberculatus.

Portunus trituberculatus is named after its breastplate. It is a kind of common seafood and the most important marine crab in China. It is of great economic significance. It is mainly distributed in most coastal areas of Japan, Korea, Malay Archipelago, Red Sea and Chinese mainland. Therefore, Portunus trituberculatus is a kind of marine crab, not a freshwater crab.

The difference between crabs and sea crabs;

1、? The difference between feet

Freshwater crabs have strong grip on their feet because they are active in mountain streams, so the feet of freshwater crabs are generally sharp; However, seawater crabs need to swim to control their speed because of the large tidal current, so they usually have flaps on their feet to control their direction and paddle.

2, the difference between the back shell

Usually, the back shells of freshwater crabs are mostly round, while those of marine crabs are mostly spindle-shaped or oval.

3. Time to market difference

Generally, the time to market for sea crabs is relatively long, and different sea crabs are listed from April to 1 1 month. However, freshwater crabs will be listed later and shorter, usually in July 7- 10/0.