1) The inner surface of mussel is grayish white, with blue edges and pearl luster. The hinge is long, and the ligament is dark brown, almost as long as the hinge. Articulated teeth are underdeveloped, and then obturator internus degenerates or disappears. Feet are small and soft.

2) The two shells of oysters have different shapes, and the surface is rough and dark gray; The middle part of the upper shell protrudes; The method of attaching the lower shell is extensive, large, flat and smooth; The inner surfaces of both shells are white and smooth.

2. Different nutritional values

1) Oyster contains many excellent amino acids, vitamin B 12, and is rich in taurine.

2) The content of protein in Qingkou is as high as 59.3%. It also contains various vitamins and trace elements such as manganese, zinc, selenium and iodine, which are necessary for human body.

3. The distribution range is different.

1) Oysters grow in warm tropical waters, and are most famous for oysters produced along the coast of France.

2) Qingkou grows in China's Yellow Sea, Bohai Sea and East China Sea.

Extended data:

Dietary nutrition of oysters (fresh);

1. There are many excellent amino acids in protein contained in oysters, which can remove toxic substances from the body, and aminoethanesulfonic acid can reduce the blood cholesterol concentration, so it can prevent arteriosclerosis.

2. Oysters also contain vitamin B 12, which has active hematopoietic function.

3. Oysters are rich in taurine, which has obvious effects of protecting liver and benefiting gallbladder.

4. Oyster is a good food for supplementing calcium. Oyster meat is salty, astringent and slightly cold; Liver, heart and kidney meridians; Has the effects of nourishing yin and blood, nourishing five internal organs, promoting blood circulation and tonifying muscles.

5, similar recipes: oyster meat should not be eaten with sugar.

Baidu encyclopedia-oyster

Baidu encyclopedia-Qingkou