The appearance characteristics of oysters
shape
The shell shape is irregular, and the size, thickness and thickness vary from species to species; The left shell or lower shell is large and concave, attached to rock or slate, and the right shell or upper shell is small and flat, covered like a lid. No feet and filaments. There is only one closed shell muscle, and the mantle membrane has most small tentacles, which are sensory organs.
The two shells of oysters are of different shapes, with rough surfaces and dark grey; Bulge in the middle of the upper shell; The lower shell is attached to other objects, is larger, rather flattened, and has smoother edges; The inner surface of both shells is white and smooth. The two shells are connected by an elastic ligament at one of the narrower ends. The middle of the shell has a strong closed shell muscle to resist the pull of the ligaments. When the shell is slightly stretched, the water flow is introduced into the shell by the wavy movement of the cilia (the amount of water flowing through it can reach 2 to 3 gallons per hour), and the tiny organisms are filtered.
characteristic
If an outer object invades the shell of an oyster, the oyster secretes pearls that wrap the outer object in layers to form a pearl. The pearls produced by eating oysters are dull and of low value. Only a few oriental species, especially the Persian Gulf pearl mussel Meleagrina vulgaris, produce the highest quality pearls. It is mainly distributed in the depths of 8 to 20 tons (48 to 120 feet) of seawater. Pearls are mostly harvested from oysters over the age of 5, and small pearls are implanted in the mother-of-pearl by hand to form cultured pearls around them, most of which are cultured in the coastal waters of Japan or Australia.
gene
An international team of researchers led by the Institute of Oceanology of the Chinese Academy of Sciences and the Huada Institute of Genetics in Shenzhen completed the sequencing, assembly and analysis of the Pacific oyster, the first sequenced mollusk genome, which will help fill gaps in our understanding of a rich and less studied mollusk family. Published online in the journal Nature, the study reveals the unique adaptation of oysters to high-pressure environments and the complex mechanisms of shell formation.
In the study, the researchers sequenced and assembled the Pacific oyster genome using short reads combined with the "divide and conquer" fosmid merger strategy. This is a new method developed by the Shenzhen BGI Genetics Research Institute that can be used to study genomes with high levels of heterozygosity and/or repetitive sequences. After data processing, the assembled oyster genome is about 559Mb, with a total of about 28,000 genes.
2 Oysters growing environment requirements
1. Living near the low tide line to the water depth of about 7m near the river into the sea, salinity is 10% to 25%. Omnivorous, feeding on small plankton. The breeding season is from May to September.
2. Inhabiting mudflats and silty seabeds more than 10 meters deep from the intertidal zone to below the low tide line, usually living in normal seawater; Individuals living in seawater with lower salinity are large. It is distributed along the coast of China and is an excellent species cultivated in estuaries and inner bays.
3. It inhabits the intertidal water storage inlet and rock reefs about 20m below the low tidal line, with high salinity and breeding period from June to August.
4. It inhabits rocky reefs with a water depth of about 15 to 30 meters below the low tide line, or on the sedimentary seabed, and can sometimes be seen a few meters below the low tide line. Salinity is 27% to 34%, and spawning begins in May to September during the breeding season when the water temperature is 17 to 19 °C.
3 Oysters are not oysters
"Seabed milk" refers to oysters, also known as oysters.
Oysters are traditional tonics, and the "Compendium of Materia Medica" has a record that oysters can "cure weakness, aphrodisiac, detoxify erysipelas, tonify male and female qi and blood, make the skin delicate, and prevent aging". There is a group of people in Hong Kong, because they love to eat oysters, they actually call themselves "high rollers", often flocking to find the fattest oysters.
Oysters are eaten in many ways. Fresh oyster meat is usually steamed, fried, raw, scrambled eggs, fried oyster cakes, skewers of fresh oyster meat and boiled soup.
Oysters, commonly known as oysters, alias oyster yellow, sea oysters. Oysters are shellfish. There are about 100 kinds of oysters in the world, about 20 kinds of coastal products in China, and the main ones that have been artificially farmed are Omi oysters, long oysters, pleated oysters and Pacific oysters.
4 The difference between oysters and oysters
In the daily dietary life of modern people, seafood is inseparable, especially coastal residents. Seafood can not only bring people the taste of the ocean they need, but also give people the need to replenish protein. There are many species of marine flora and fauna, some of which people can't even name. However, some crew members who went to sea were not unaware of this.
When it comes to oysters and oysters, everyone thinks that this is actually the same creature, there is no difference. Oysters and oysters, however, are really subtle. Today, we will understand the difference between the two!
Oysters and oysters are two completely different things, although many times and many places also refer to "oysters" as oysters, or strictly speaking, oysters are a type of oyster.
Oysters, mollusks, have two shells, one small and flat, the other large and raised, triangular in shape, the dorsal ventral margin is figure-eight, the right shell is pale yellow on the outside, with loose concentric scales, the scales undulating into waves, and the surface of the white shell on the inside is uneven. Meat is eaten and oyster sauce can be prepared. Meat, shell, oil can be used in medicine. Also known as oyster clams, oyster clams, oyster yellow, sea oysters, oysters and so on. There are several species of oysters living in different seas.
Oysters are a relatively large oyster species, a large shell can be more than a pound, it is generally grown or cultivated in the river and the sea where the blend, in the salty and half-light inner bay shallow sea. Due to the restrictions of suitable growth conditions, its number is less than that of other varieties, so its economic price is generally relatively high.