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

How to keep live oysters alive without dying

Unless it is in its living place, the oysters in the buyer's hands will not survive for a few days, and the survival time can only be appropriately extended by 3-7 days.

Preparation: a large basin, some clean water, a wet cloth

Treatment method:

1. Rinse the surface of the oysters with clean water.

2. Prepare a container that can hold oysters and add appropriate amount of water into it.

3. Place the oysters in clean water, but the water should not cover the oysters.

4. Cover the basin with a wet cloth and place it in a ventilated and cool place. This will allow the oysters to be preserved for about 3-7 days.

Note: Change the water every 1-2 days and add some salt to the water. It is better to use the water that comes with the oysters.

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.