CATDOLL : CATDOLL: How to keep live oysters alive without dying?

1. How to keep live oysters without dying?

Oysters require high oxygen levels and need to be oxygenated all the time. The salinity can be adjusted to 1.020-1.025.

Oysters have the function of purifying seawater. They mainly eat plankton and organic debris. It is said that each oyster can filter 400 liters of water every day. Some time ago, Japan used the oyster method to successfully purify the water quality of Tokyo Port.

But keeping the oysters you buy from the market alive depends on luck, because most merchants have either rinsed them with fresh water (causing internal injuries to the oysters, making them unable to survive) or have frozen them for 24 hours (which also makes it difficult for them to survive).

May and June are the breeding season for oysters. If you have already raised them and find that the water suddenly turns white and turbid, it is caused by the oysters spraying sperm or eggs, which can easily cause the water to become rancid and smelly.

Remember to have an air stone to give you oxygen.

Is your home near the sea?

If you live near the sea, you can just place them on rocks in the sea. If you live far away, you must use seawater or salt water. However, oysters cannot survive long without the sea or salt water, because these waters do not contain the various plankton (nutrition, food) that oysters need. At most, they can survive for three to five days, and then they will become thin and slowly die. How pitiful!

2. History of oyster farming?

On January 13, 2018, in Weihai, Shandong, women sorted freshly harvested oysters at the Rushan oyster breeding base.

The oyster harvest season is from November to April of the following year. During this period, many local left-behind women will do odd jobs at the breeding base, responsible for the preliminary sorting of the oysters salvaged ashore. The wage is calculated at 10 yuan per hour, earning about 80 yuan a day.

Rushan is known as the "Hometown of Oysters in China" and has a history of oyster farming for more than 20 years. The main species is Pacific oysters, which are cultivated in rafts. The oyster farming area is 80,000 mu, the output exceeds 300,000 tons, and the output value is 1.8 billion yuan. The farming area and output rank first among county-level units in the country.

my country has a long history of oyster farming. There are records of "raising oysters with bamboo" since the Song Dynasty. In recent years, the technology of oyster farming has developed rapidly in many countries. Many countries have introduced an excellent variety called "true oyster" from Japan, which has the characteristics of thin shell, fast growth and high meat yield. This "true oyster" can be put on the market after only 8 months of farming, and the oyster meat can reach 135 to 170 tons per square kilometer.

3. Oyster farming methods

Oysters, also known as oysters, are one of the larger species. There are many breeding methods, among which there are 8 basic methods (with key points): 1. Raft culture, which is divided into two types: hanging rope and cage culture. It is necessary to ensure that the water depth is about 4 meters, and choose a river mouth with low salinity to breed near the river. 2. Sowing and raising seedlings on the tidal flats; the site should be selected with small waves, flat tides, and pollution-free inner bays. Sowing is more suitable from mid-March to mid-April. 3. Oyster and shrimp mixed culture. With silt or mud sand as the bottom material, the water depth is more than 1.3 meters, and the daily average water exchange rate should reach more than 50%. The sowing time is selected in early April. 4. Stone throwing culture. The rocks of the oyster seedling machine are used as cultivation equipment, and the baby's baby, plum blossom and row cultivation methods are adopted. 5. Bamboo cultivation. Arrange in a straight or oblique manner with gaps in the middle to make the water flow smooth. 6. Bridge culture. The stone bars used in the bridge seedling method are rearranged, with 6 to 7 bars in a group, the distance between groups is about 50 to 60 cm, and the distance between rows is 1 to 2m. 7. Vertical stone culture. This method is relatively simple. As long as the amount of seedlings collected is appropriate, it can be allowed to grow naturally. It is mainly used for the cultivation of pleated oysters. 8. Grid farming. The water depth is 2 to 4 meters, and a fixed grid is set in a calm place. Most oyster seedlings are raised on a grid with shells and cement tiles. Each string is 1 to 1.5 meters long and the distance between strings is 0.5 to 1 meter. Note that the density should not be too high to prevent the bottom from being seen, so as to avoid being attacked by the natural enemies of benthic organisms.

4. How to raise oysters and what are the techniques for raising them?

1. Clean the newly bought live oysters and put them in a clean basin. Be careful not to add water. Cover the surface of the basin with a wet cloth and put it in the refrigerator. They can survive for up to one week.

2. If you want to eat them the next day, clean the oysters, put a layer of water in a basin, but don't cover the oysters, just keep them moist, or cover them with a wet cloth and place them in a cool and ventilated place.

3. When buying oysters, pay attention to whether the oysters are vibrant enough. When the oyster opens slightly, you can touch the shell of the oyster to see if it can close the shell quickly. If it can, the oyster will live longer.

4. To keep oysters alive for a long time, they must be freshly caught. Such oysters have a shiny appearance and a strong smell of the sea. The shell of the oyster is intact, the mouth is tight and not loose, and the body is relatively thick.

5. How to raise oysters

There are many ways to farm oysters, and as farming continues to develop, new farming methods and technologies are constantly emerging.

The more common ones include bamboo planting culture, bottom sowing culture, stone strip and standing stone culture, and hanging culture. Among them, hanging culture is further divided into grid type, longline type and raft type.

Regardless of the breeding method or method, choosing the breeding site is the key. It should be determined based on the living habits of oysters and their requirements for environmental factors and within their adaptability range. In addition, the degree of pollution from industrial and agricultural hazardous wastewater should also be considered. Management is an important part of breeding any species.

The management of vertical aquaculture of long oysters mainly includes: timely evacuation of aquaculture density, adjustment of aquaculture water layer, reinforcement of typhoon prevention and anti-sinking, etc.

6. How to grow oysters to make them fat?

Hello, dear readers, welcome to read this issue. Today I will take you to have a deeper understanding of an important agricultural product, "oyster farming."

Oysters are not unfamiliar to everyone. They are a must-have at barbecue stalls and night snacks everywhere. A small oyster is roasted over fire for a while, and then added with minced garlic and chopped pepper. It is extremely delicious, so it has become a must-have delicacy for many people for midnight snacks.

Oysters grow in warm and tropical oceans, and French oysters are the most famous. They are widely distributed in China, from the Yalu River in the north to Hainan Island in the south, and can be found in coastal areas. At the same time, oysters are soft-bodied creatures with hard shells. Oysters produced at the junction of salt and fresh water are the most plump. my country has introduced breeding since 1979, and now oysters have become an important agricultural breeding product. It is an indispensable delicacy in the late-night snack market, but oysters are not just a delicacy. They also have high medicinal value and have the effects of nourishing yin and blood, clearing away heat and removing dampness.

But how are these delicious oysters farmed? Here are three points to help you understand more:

Growth environment

There are many ways to cultivate oysters, the most common ones are bamboo planting, bottom seeding, etc. No matter which method is used, the selection of the breeding site is the most critical. Oysters can survive in water temperatures of 0-32℃, and the most suitable water temperature for growth is 15-25℃. It also has a wide range of adaptability to salinity, and is best in the range of 10-40‰.

Feed

Oysters only have the ability to physically select food, that is, they can only choose the size of the food, and they have no ability to choose general food. Therefore, oysters mainly feed on diatoms and organic debris, especially Stratus elata, Sievella ciliata, and Thalassiosira salina.

Precautions

When farming oysters, you must pay attention to the location. You cannot farm near places where agricultural and industrial wastewater is discharged, because this will kill the oysters or carry toxic substances in their bodies. You must also pay attention to the density of evacuation and the adjustment of the water layer for farming. You must also strengthen the typhoon and raft prevention. Generally, it takes one to one and a half years to farm before you can harvest. The oysters that have been salvaged can only be eaten after a week, because you have to wait until the oysters have spit out all the silt in their bodies.

Now everyone should know how oysters, which are a must-have for midnight snacks, are farmed. Oysters are very popular in the domestic midnight snack market today and have become a must-have delicacy. While enjoying the delicious oysters, please do not forget the hard work of our farmers.

Oysters belong to the phylum Mollusca, class Bivalvia, family Ostreidae. They are the most common bivalve molluscs along the coast, with many species. It is said that there are more than 100 species in the world, and more than 20 species have been reported in my country. The following four species are mainly cultivated artificially: Omi oysters, pleated oysters, dense-scaled oysters and long oysters. The cultivation technology of long oysters is introduced as follows: Long oysters are also called true oysters and Japanese true oysters. Pacific oysters are naturally distributed along the coast of Hokkaido to Kyushu in Japan. It is an inland bay shellfish with a wide range of temperatures and salinities. It attaches to rocks or buildings that are exposed at low tide. my country has introduced aquaculture since 1979.

1. Life Habits Oysters live a fixed life from the moment they attach themselves to the object. They cannot move on their own without leaving the object. They can only open and close their shells. The left shell is fixed, and only the right shell can open and close. They rely on the opening and closing of the right shell to carry out life activities such as breathing, feeding, reproduction, and excretion. When encountering adverse environmental conditions, they close their shells tightly to survive. Long oysters are wide-temperature shellfish. They can live in water temperatures of 0-32℃, and the most suitable water temperature for growth is 15-25℃. They also have a wide range of adaptability to salinity. They are distributed in the salinity range of 10-40‰, and grow faster in sea areas with low salinity. Oysters mainly feed on single-celled plankton and organic debris. There is no special regularity in feeding. Generally, they feed vigorously when the water temperature is 10-25℃, but during the breeding season, the feeding intensity is relatively weakened.

2. Reproduction characteristics Oysters begin to reproduce when their gonads mature at the age of one. There are two types of reproduction: larval and oviparous. Long oysters are oviparous and fertilized in vitro. Most long oysters are hermaphroditic, and a small number are hermaphrodites. When the gonads mature, the males are milky white and the females are light yellow. When the water temperature in the natural sea area rises to 16℃, the gonads of long oysters begin to mature, and the peak spawning period is when the water temperature reaches 24-25℃. The peak breeding period in the Yueqing Bay sea area of ​​Zhejiang Province is from June to July. Oyster spawning is mostly carried out during the high tide. When the water temperature is 23℃, the fertilized eggs develop into D-shaped larvae after 20-22 hours. Under the condition of water temperature of 23-26℃, after about 20 days of cultivation, the average shell length of the D-shaped larvae can reach more than 280μm, and 40%-50% of the larvae have eyespots. At this time, the attachment base should be placed so that the larvae can metamorphose and attach.

3. Seedling production At present, there are two ways of oyster farming: fully artificial seedling raising and semi-artificial seedling collection. The operation process of fully artificial seedling raising includes: temporary rearing and ripening of broodstock, egg collection, hatching and selection, bait and larval cultivation, preparation, processing and release of attachment base, and juvenile spat out of the pond; the operation process of semi-artificial seedling collection includes: selection of seedling collection site, examination of broodstock gonad development, collection and investigation of planktonic larvae, preparation, processing and release of attachment base, etc. 4. Cultivation: There are many methods of oyster farming. With the continuous development of farming, new farming methods and technologies are constantly emerging. Among them, the more common ones are bamboo planting farming, bottom seeding farming, strip stone and standing stone farming, and hanging farming. Among them, hanging farming is divided into grid type, longline type and raft type. Regardless of the farming method or method, the selection of the breeding site is the key, which should be determined according to the living habits of oysters and the requirements of oysters for environmental factors and within their adaptability range. In addition, the degree of pollution of industrial and agricultural harmful wastewater should also be considered. Management is an important part of any breeding of species. The management of the hanging culture of long oysters mainly includes: timely evacuation of the culture density, adjustment of the culture water layer, reinforcement of typhoon prevention and anti-sinking (raft), etc. 5. Harvest: Long oysters generally need to be cultured for 15-18 months before they can be harvested. When harvesting, the fullness of the soft part of the oysters and factors such as storage and transportation should be considered.

If you want to grow oysters, you should use some fresh water and add some fish and insects that they like to eat. So these are indispensable. Giving oysters some protein will make them grow fatter.

When raising them, they are usually raised in the sea, and they need to be fed with feed.