CATDOLL : CATDOLL: Will people who cultivate pearl oysters artificially stuff fake pearls into the oysters?

1. Will people who cultivate pearl oysters artificially stuff fake pearls into oysters?

1) The implanted pearl is not a fake pearl, but the nucleus, which is the flesh of the pearl oyster!

2) Currently, in the industry, pearl oysters are used to implant meat slices, and there is no such situation as you mentioned!

Pearl farming is harvested once every four years and the processing is quite complicated

China is the hometown of pearls and the main pearl producing area in the world, accounting for more than 95% of the world's total output, and Zhuji City is the main producing area of ​​freshwater pearls. During the interview, the reporter learned that Zhuji pearls have now been cultivated in Hunan, Jiangxi and Jiangsu.

Pearl farming is divided into three steps

On the afternoon of September 24, the reporter found a clam killing farm at the head of Zhandong Village, Shanxiahu Town, Zhuji City. The wide ground was covered with river clams. More than a dozen workers sat behind the river clams, opening the clam shells to pick pearls. The reporter took the opportunity to learn about the pearl farming process from the workers. To cultivate pearls, the mother-of-pearl (also known as pearl seedlings) must be cultivated first. The clams used to cultivate freshwater pearls include the triangular sail clams, the pleated crown clams, the mother-of-pearl pearl clams, the back-tumored clams, the pond saucer clams, etc. The mother-of-pearl in Zhuji is mainly the triangular sail clams. The main sources of mother oysters are wild collection and artificial hatching. After cultivating the mother-of-pearl, it is necessary to "insert the nucleus", that is, to implant the seed nucleus into the mother-of-pearl oyster in order to form pearls. The seed nucleus is generally made of shells or mussel meat, has a good roundness, and is about 5 to 7 mm in diameter. It determines the size of the cultured pearls.

The nucleus insertion is usually done by women who have been practicing for a year and have become skilled. They use various methods (such as inserting bamboo) to make the pearl oyster's shell slightly open. Then use surgical tools to implant the implant nucleus into the mother oyster's mantle. After the completion is completed quickly, it is placed in a cage to rest. After the first two steps are completed, pearl cultivation will be carried out. The pearl oysters that have been implanted with the nucleus need to be placed in a special raft suspended on the cage, and the raft is anchored in calm waters with little environmental change. The best time is March or April every year, because the water temperature at this time is most suitable for the healing of the pearl oyster's mantle wound. After 2 to 3 weeks, the nucleus begins to accept the nacre secreted by the pearl oyster, and then forms pearls.

Zhuji Pearls: “The World is Your Home”

Ms. Wei, the female owner of the oyster killing farm, said that 4 to 6 weeks after the mother-of-pearl oysters are released, the development of the nacre layer needs to be checked, and then they are placed in new cages and transferred to a fixed pearl farm. In the next three and a half years, they are allowed to remain undisturbed and grow normally. Pearls are generally harvested after 4 years of cultivation. If some mother-of-pearl oysters die, the pearls can be picked at any time, and some pearls can even be picked after two years.

Ms. Wei told the reporter that the clams in front of her had been raised for 7 years, so the pearls in the shells were numerous and large, and of high quality. She opened a clam shell at random, and the reporter found that the clam meat contained many pearls of different sizes. After cleaning the clam meat, the shell was filled with 32 shiny pearls, and several pearls were integrated with the shell, which needed to be knocked with iron tools to be removed. Ms. Wei revealed that the pearls were only processed here in a preliminary manner, and the breeding was done outside. It is understood that in recent years, the water surface of Shanxiahu Town has been far from meeting the local people's demand for pearl breeding. Many people have gone to Hunan, Jiangxi, Hubei, Jiangsu, Anhui and other places, either contracting the water surface or cooperating with local people to breed pearls. No one knows how many acres of water surface Zhuji pearls have been cultivated on, and this is just a processing and distribution center for pearls. More than 90% of the pearl products in large and medium-sized cities in China, including Qingdao, come from Zhuji.

Pearl processing requires constant improvement

Pearls that are integrated with the shells can only be processed into low-grade necklaces or ground into pearl powder because of their deformed appearance. In several pearl companies, the reporter saw workers selecting pearls according to specifications, some holding pearls in front of small machines for polishing, and others drilling holes and threading pearls, very busy.

The reporter learned that after purchasing pearls from the clam killing farm, the pearl company will first "bathe" the pearls. After the pearls reveal their true colors, the workers will classify the pearls according to color, size and shape. After that, the irregular pearls will be polished. After the pearls are rinsed and colored, the pearls to be made into necklaces must be punched and threaded. The pearls to be made into earrings and other accessories must be carefully weighed, counted, and then stored. From seedlings to processed products, a pearl must go through more than 10 procedures before it can release its brilliance and charm. A pearl company owner in Shanxiahu Town said that the town processes and produces 1,500 tons of pearls every year.

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2. Catfish breeding methods and precautions Share the method of raising catfish at home

1. Breeding pond.

To breed pond mullets, we must first choose a good place and build a breeding pond. Generally, we use ponds for breeding. The water resources around the breeding pond are abundant, which is convenient for drainage and water change. We level the bottom of the pond and arrange anti-escape nets at the water inlet and outlet. Some aquatic plants can be planted around the pond, which can purify the water quality and provide shade and hiding. It is also best to arrange a layer of fence around the pond to prevent pests from entering. Finally, the pond should be disinfected with quicklime before stocking to reduce the probability of disease.

2. Release the fish fry.

We need to select the fry of the mullet fish with good physique, strong, disease-free, no external or internal damage, and uniform size. We also need to disinfect the fry before stocking, usually by washing them in dilute salt water for about ten minutes and then fishing them out. Finally, the fry can be placed in the breeding pond at a density of 20,000 to 30,000 per mu.

3. Feeding.

The mullet is an omnivorous fish species that mainly feeds on meat. It also has a wide variety of feeds. For example, snails, river clams, fly maggots, fish and shrimp, animal offal, etc. can all be used to feed the mullet. Of course, if you need high-protein feed, you can also use bloodworms, earthworms, mealworms, etc. The mullet generally needs to be fed twice a day, at around 8 o'clock in the morning and around 6 o'clock in the afternoon. The last thing to note is to reasonably configure the feed ratio and feeding amount according to weather changes and the growth status of the mullet.

3. Where to buy river clam seedlings?

Hello!

I suggest you buy it from the nearest farm, or catch it from the river yourself, thank you!

4. I have a river clam. How can I reproduce it? And what can it eat to supplement its nutrition?

Fertilization methods There are two methods of fertilization of river clams: natural fertilization and induced fertilization.

① Natural fertilization: During the breeding season of clams, the mature eggs of female clams are discharged into the mantle cavity of the body through the genital pore; the mature sperm of male clams are discharged from the vas deferens through the genital pore to the suprabranchial cavity, and then discharged into the water body outside the body through the outlet pipe. The sperm enters the mantle cavity of the female clams with the water and combines with the eggs to be fertilized to complete fertilization. The fertilized eggs develop embryos on the left and right external gill lobes of the mother clams.

② Induced fertilization: The reproductive cells of male clams usually mature earlier than those of female clams. When some of the female clams' eggs mature, the male clams' semen can be artificially taken out, diluted with reproductive salt water, and injected into the mantle of the female clams. The female clams are placed in a fertilization basin with a water temperature 3 to 5°C higher than that of the original pond to induce fertilization. The first injection of semen only serves to induce ovulation in the female clams. The same method is needed to inject the second diluted semen. The sperm in this semen will fertilize the induced mature eggs. Through induced fertilization, river clams can enter the breeding season early.

The organic matter in mud is mainly algae.

Mussels grow by filtering various organisms in the water.