Classification of oyster varieties.

There are many kinds of oysters. According to statistics, there are more than 100 species found in the world, which are distributed in tropical and temperate zones. In China's coastal areas, oysters are widely distributed, and about 20 species are produced in Bohai Sea, Yellow Sea and Nansha Islands. There is also artificial culture in the inner bay of the estuary, and oysters can be divided into artificial culture and natural reproduction. According to the records of Mei in the Song Dynasty, people not only knew to eat oyster meat in the Song Dynasty, but also coastal fishermen were already engaged in "cultivating oysters by inserting bamboo" and cultivating oysters on the beach. Artificial farming has a long history. Oysters cultured in coastal areas of China are divided into long oyster, pleated oyster, offshore oyster, Dalian Bay oyster, Yangtze oyster and fishing village oyster. There are two kinds of oysters, one is oyster and the other is dried oyster. The front is wild and the back is farmed. 1, oyster

It is long and flaky, with several parallel dorsal and ventral edges, with a length of 10 ~ 50 cm and a height of 4 ~ 10~50cm. The right shell is small, fresh slices are thick, layer by layer or layer by layer. The outer surface of the shell is flat or has several depressions, lavender, grayish white or yellowish brown, the inner surface is porcelain white, and there are no small teeth on both sides of the shell top. The left shell is deep and concave, the scales are thicker than the right shell, and the attachment surface at the top of the shell is small. Hard, layered cross section, white. Tasteless and slightly salty. 2. oysters in Dalian bay

It is triangular, and its dorsal and ventral edges are splayed. The outer surface of the right shell is light yellow, with loose concentric scales, wavy and white inner surface. The concentric scales of the left shell are solid and thick, and several pieces are radial from the top of the shell, which is obvious. The inner surface is concave box-shaped, and the hinge surface is small.

3. oysters by the river

A circle, an ellipse or a triangle, etc. The outer surface of the right shell is slightly uneven, with gray, purple, brown, yellow and other colors, surrounded by concentric scales, and the scales of larvae are thin and brittle. After years of growth, the scales are layered, the inside is white, and sometimes the edges are lavender.

4.oysters

This kind of oyster is one of the larger varieties. A big oyster with a shell can weigh more than one kilogram. Generally, it grows or is cultivated in the place where rivers and the sea blend, on the shallow sea in the inner bay, half salty and half light. Due to the restriction of suitable growth conditions, its quantity is less than other varieties, so its economic price is generally higher.

5. red snapper with seven ears

This species is one of the smaller oysters, about 0.5~ 1.5 cm in size, and it grows in Daguan sea area of Xiang 'an District, Xiamen City. The cold sea area is located between the cold island and Houcun and Caicuo, with Jinmen Island outside, forming a semi-circular sea area, which is known as the purest sea area along the southeast coast. Oysters generally have only five gills, and dried oysters with steamed heads belong to this category. Oysters that grow in cold seas are different. They are not big, but they have two more gills than those grown in other sea areas, so local residents proudly call them "seven-eared pearl oysters". This variety is small, sweet and delicious, and enjoys the reputation of "undersea milk" because it is milky white after boiling. The so-called dried oysters in fishing villages refer to oysters born on rocks, with small meat and little water. This wild oyster born on rocks is easy to collect. Just peck, hook and pull the oyster shell with a short curved iron hook, and the oyster meat can be taken out. Because this method of picking oysters is to break the shell to get meat, it is called "breaking oysters" (digging oysters) in fishing villages. When I was a child, I had nothing to do around me, so I had to have fun with a group of children. It was really fun to peck around. However, wild oysters are both ownerless and easy to obtain. Of course, they are easy to obtain and use, but they are not easy to see in the market. A few years ago, I read Zhang Wuchang's Interpretation of Economics and said, "If a property is really' public', that is, it can be used freely in competition, and there is no limit on the number of competitors, then competition will make this public property almost impossible to find under the condition of scarce resources." If so, I would have laughed. However, Zhang Wuchang is not smarter than me. He didn't realize that when a large number of public goods are used by a limited number of people and few people know their delicacies, such public goods will not disappear completely.

Although there are restrictions on fishermen fishing at sea, they are allowed to catch aquatic products from beaches and rocks. The fishing village is delicious, but not many people know it. And once the supply exceeds the demand, this season's aquatic products will be exhausted immediately, and it will not be available until next year. It is also a self-regulation method of nature. The stock market goes up and down, unless it opens tomorrow, it will stop at the bottom and continue to make a fortune.

Wild oysters are far more delicious than those cultivated on beaches. One is not fishy, because it is small, thin and not fat, just like Xiaojiabiyu, but it has its own pure qualifications, not publicity, not so fishy. The second is delicious. Although the oysters raised on the beach are plump, they are much whiter and less black. The so-called "too much is not enough" just masks the sweetness that oysters should have. So is Li Yu's so-called "fishy and tasteless".