1. Lobster: The head and chest are thick, the shell is hard and colorful, the abdomen is short, the body length is generally between 20-40 cm, and the weight is about 0.5 kg. Some have no claws, and the abdomen and limbs can be transformed into claws the next day.

2. Crab: The body is symmetrical, which can be divided into forehead area, eye area, heart area, liver area, stomach area, intestine area and gill area. The two sides of a crab are connected by appendages. The appendages of the head are called tentacles, which have the functions of touch and smell. Some appendages have the function of mouth, which is used to tear food and send it into the mouth.

Second, the types are different.

1, Lobster: Lobsters are distributed on all continents in the world, with a wide variety, and generally inhabit the offshore seabed or the shores of warm oceans. There are at least eight kinds of lobsters made in China.

Mainly include: China lobster, olive color, produced in the coastal areas of Guangdong, large in size and large in output; Ripple lobster, similar in color to China lobster, grows in the coastal area of South China Sea.

Hairy lobsters, the same color and shape, are produced in Hainan Island and Xisha Islands. Splendid lobster, with colorful patterns, can reach 4 ~ 5 kg at most, and is produced in Zhoushan Islands, Zhejiang Province, with little output. In addition, there are Japanese lobsters, variegated lobsters, spiny lobsters and striding lobsters.

2. Crabs: There are many kinds of crabs. There are about 600 kinds of crabs in China, including swimming crab, blue crab, frog crab, Guan Gong crab and so on.

Third, the nutritional value is different.

1. Lobster: The nutrients in all kinds of shrimps are similar. All kinds of shrimps are high in protein and low in fat. The content of protein accounts for about 16% ~ 20% of the total, and the fat content is less than 0.2%.

Moreover, the fat contained is mainly composed of unsaturated fatty acids, which is suitable for human body to absorb. The contents of trace elements such as zinc, iodine and selenium in shrimp meat are higher than those in other foods. At the same time, its muscle fibers are tender and easy to digest and absorb. Lobster is not only white, tender and delicious, high in protein, low in fat and rich in nutrition, but also has medicinal value, which can eliminate phlegm and relieve cough and promote postoperative wound healing.

2. Crab: Rich in protein and trace elements, it has a good nourishing effect on the body. Crabs contain more vitamin A, which is helpful for skin keratinization. Crabs also have anti-tuberculosis effects, and eating crabs is of great benefit to the rehabilitation of tuberculosis.

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