How many small crabs are best in 1 acre, and how many crab seedlings do you need to put in 1 acre?

Seedling stocking Rice field crab farming is suitable to choose March and April seedlings, when the rice field has been cultivated, which is conducive to the adaptation of river crabs to the environment, can avoid damage to seedlings when cultivated land, and improve the survival rate of crab seeds. The most suitable seed size is 80 kg and 120 kg, and the stocking density is 500 mu and 600 mu. The method of stocking is:

After the locally raised crab seedlings arrive, they can be put into the rice fields after a short stop; After the seedlings purchased from other places are transported, they should first adapt to 3 minutes and 6 minutes, then put them in the pond and soak them for 1 minute and 2 minutes, and then take them out and place them for 3 minutes and 5 minutes, and repeat them 2 times 3 times before they can disperse the crab seedlings into the rice field and adapt the crab seedlings to the water environment.

This demonstration base, which mainly breeds crabs, has entered the end of its annual harvester, and only three or four people are tied to the crabs caught in the crab hall in front of the hut where they work at the base. "The base has a total of 5 ponds with a total area of 200 acres, mainly breeding crabs and shrimps. Pan Wangjun said that Jindan is rich in water resources, advanced breeding technology, and the total aquaculture area of the region is 10,000 hectares.

With an annual output value of more than 2 billion yuan, it is the first national fishery healthy breeding demonstration county in Jiangsu.

Aquaculture and water quality are the most important, including 8 indicators such as dissolved oxygen content, temperature, acidity, and ammonia nitrogen content. The most important of these is the dissolved oxygen indicator. As soon as the dissolved oxygen content of crab soup falls below 8 mg, the aerator must be started immediately.

Otherwise, the crab will die due to lack of oxygen. Microporous aeration technology is the most efficient in recent times and can rapidly increase the amount of dissolved oxygen in cultured sugars.

Traditional aquaculture determines the opening time of the oxygen machine by observing the state of the water, the smell of water vapor, etc., and judging the amount of dissolved oxygen in the water according to experience. Modern scientific aquaculture detects the level of dissolved oxygen and other indicators in the water through instruments, decides whether to start the oxygen machine, and takes other measures to ensure the growth of aquatic products. "Providing oxygen to ponds is the primary task of aquaculture, but when to implement oxygenation, the amount of ammonia nitrogen in the pond exceeds the standard, etc., the answer should be provided through scientific inspection, and decisions such as aeration and organic matter removal should be made accordingly, and the implementation should be organized.

Jintan District refers to Wang Jinbiao, the deputy mayor in charge of agriculture in Quanzhen. However, oxygen enhancement is inseparable from electricity. Because of the aging of power facilities or insufficient power, unexpected power outages occur, and the hard work of farmers for a year may be in vain.

In the past year, there have been 12 similar incidents in the Gimdam area, with insurance compensation amounting to more than 200,000 won.

The crabs of the big parents of the pond are respected and loved by the farmers. Many farmers believe that the larger the sample size of the crab, the larger the sapling. Because in the end, only good genes can make offspring better.

This is a common awareness among farmers. Many saplings on the market have launched six-haired and eight-hole parents, in fact, the big parents are only crab specifications, and they are not crabs with large parent crabs. The size of the parent is large, and the higher the cost of white seed seedlings and crab seedlings, the higher the **.

Because the big parents are basically elected every year, inbreeding, breed degradation, disease, and serious matriline hybridization between the north and the south are serious, and various factors lead to the instability of the big parent crabs. So, how to choose crab seedlings? In general, choosing crab seedlings with good vigor, quick response, and agile size will help pond management and avoid too much difference in the size of the seedlings, resulting in a delay in the shedding time.

Select crab seedlings with good body color, firmness, and plumpness, mainly through the identification and judgment of meat head, flatness, liver color, etc. Phenomena such as choosing healthy, clawless, black claws, claws, etc., are seedlings.

If it is a co-culture of crabs in rice fields, it is generally between 260 and 300 catties per mu; If it is co-cultured with shrimp and shrimp in paddy fields, it is generally 150 220 catties per mu; If it is a co-cultivation of loach and crabs in the paddy field, it is usually 200 260 catties per mu; If it is a co-culture of yellow eel and crab in the paddy field, it is generally between 180 and 250 catties per mu; If it is a single field intensive cultivation, it is generally 300 380 catties per mu; If it is a single field extensive, it is generally between 180 and 230 catties.

One acre of excellent crab field can produce about 300 catties of commercial crabs.

You can put about 1,200 crab seedlings, if you want to produce large crabs, you can put less, and if you want to produce more crabs with a small yield, you can put more. The survival rate is about 70 percent, and the general seedling yield is about 200 catties, and the yield may only be more than 100 catties if it is not raised well.

Summary. The stocking of crab seedlings is about 80 per square meter.

I do aquatic products, just into the history of the crab after a long time to die and tease, I want to ask you is it caused by the sale of oxygen cut-off? How many should I put in a 1 square meter water tank? Thank you for being able to.

The stocking of crab seedlings is about 80 per square meter.

The finished product is sold when it comes in, and it is placed in the water tank and supplied with oxygen.

Most of them are caused by high temperature and lack of oxygen, and if there is a lack of oxygen in the water quality, the brook crabs are easy to die, and the temperature is more or less appropriate.

How do you control the temperature, teacher?

River crab is a crustacean ectothermic animal, the survival temperature of adult crabs is 5 30, the most suitable temperature is 19 25, and the water depth should be able to reach two meters in the high temperature season. The area of the ditch accounts for 15% to 25% of the city's area. There should be a reliable laughing model water source next to the construction of the breeding pond, and the water source is not polluted, and the water quality is also in line with the national testing standards, so it is suitable for breeding hairy crabs.

The periphery of the breeding pond can be set up with a black plastic plate to set up a layer of anti-escape net, and the anti-escape net should be about ten centimeters under the head.

One acre of large-scale flat prototype reservoir, about meters deep, 300 crab seedlings per mu, that is, about 4 catties; Ponds, rivers, reed ponds, bubbles, wetlands and other water surfaces are intensively cultivated with about 10 15 catties per mu, about 1,000 crab seedlings; About 700 crabs are put into the water surface of each mu in the rice field, that is, one crab seedling per square meter, about 8 catties.

It is advisable to choose March and April for crab farming in paddy fields, when the paddy field has been cultivated, which is conducive to the adaptation of river crabs to the environment, can avoid damage to seedlings when cultivating land, and improve the survival rate of crab seeds.

After the locally raised crab seedlings arrive, they can be put into the rice fields after a short stop; After the seedlings purchased from other places are transported, they should first adapt to 3 minutes and 6 minutes, then put them in the pond and soak them for 1 minute and 2 minutes, and then take them out and place them for 3 minutes and 5 minutes, and repeat them 2 times 3 times before they can disperse the crab seedlings into the rice field and adapt the crab seedlings to the water environment.

The number of crab seedlings per mu, that is, the selection of crab seedling density, should be based on the water resources, such as water depth, water flow, the number of aquatic weeds, varieties, whether to stock other fish and shrimp, while taking into account the number of natural enemies on the water surface, the specification needs of the crab market, gender needs, etc.

The density of stocked crab fry varies according to the water surface type, which is roughly as follows. The large flat prototype reservoir is about meters deep, and 300 crab seedlings are cast per mu, that is, about 4 catties; Ponds, rivers, reed ponds, bubbles, wetlands and other water surfaces are intensively cultivated with about 10 15 catties per mu, about 1,000 crab seedlings; About 700 crabs are put into the water surface of each mu in the rice field, that is, one crab seedling per square meter, about 8 catties.

About 3700 pieces.

Raising crabs requires the cost of crab acres, feed, pond rent, labor, etc., and one mu of crabs needs a capital of 3,709 yuan, and a year can obtain a profit of about 5,000 yuan per mu.

The following is an analysis of the large-scale model of sparse river crab breeding, with about 600 river crabs per mu.

1. Stocking specifications: 3 4 grams of tail river crab seedlings;

2. Stocking quantity: 600 acres;

3. Breeding area: 1 acre;

4. Feed cost: a total of tons of feed are fed during the breeding process, totaling 10,000;

5. Seedling cost: 10,000;

6. Crab medicine and electricity: 10,000 yuan;

7. Aquatic plants and snails: 10,000;

8. Pond rent: 10,000;

9. Total cost: 10,000 yuan.

Raising crabs requires the cost of crab acres, feed, pond rent, labor, etc., and one mu of crabs requires a capital of 3,709 yuan, which is the next time a year.

You can get a profit of about 5,000 yuan per mu, and the breeding benefits are considerable.

1. Investment details of crab farming:

Stocking specifications: Stocking specifications 3 4 grams of tail river crab seedlings. Stocking Quantity:

600 acres. Feed cost: a total of tons of feed are fed during the breeding process, totaling 10,000 tons.

Seedling cost: 10,000. Crab medicine and electricity:

Ten thousand. Aquatic weeds and snails: 10,000.

Pond rent: 10,000. Total cost: 10,000.

Freshwater river crab farming, pond farming, excluding water surface contracting costs and labor, and the average cost of all other products is about 1,000 yuan per mu. Including crab seedlings, bait, disease prevention, anti-escape film setting, fishing nets, aquatic weed cultivation.

1. The size of crab seedlings is 80 to 120 per kilogram, the stocking density is 500 to 600 per mu, and the stocking specifications of each field are as consistent as possible, so as to facilitate the synchronization of river crab populations, which is convenient for management and feeding.

2. The density of stocking crab seedlings is different for different water surface types, which is roughly as follows:

The large-scale Pingdan Radical Reservoir is about meters deep, 300 crab seedlings per mu, and about 4 catties of rock tarla;

Ponds, rivers, reed ponds, bubbles, wetlands and other water surfaces are intensively cultured with about 10 to 15 catties of rough and slippery per mu, about 1,000 crab seedlings;

About 700 crabs are put into the water surface of each mu in the rice field, that is, one crab seedling per square meter, about 8 catties.

When breeding crabs in rice fields, 600 crab seedlings are placed in one acre, 2,000 crab seedlings are put into each mu when crabs are intensively raised in the pond, and 300-700 crab seedlings are cultivated in one mu under the mode of semi-intensive cultivation in water loss, and the depth of the pond water should be kept at about 2 meters during the breeding period, and the pond should be disinfected by using quicklime.

The number of crabs per mu should be determined according to the breeding mode, when the crabs are bred in the paddy field, the breeding density is 600 per mu, when the crabs are intensively raised in the pond, the breeding density is 2000 per mu, and the semi-intensive culture mode in the reservoir can breed 300 to 700 crabs per mu.

Breeding crabs should choose a pond with convenient drainage and no pollution, and keep the depth of the pond water at about 2 meters, and install a protective net in the drainage hole and the water inlet hole of the pond to avoid the crab escaping, in order to make the crab grow healthily, the pond should be disinfected with quicklime before breeding, and the silt and soil quality at the bottom should be improved.

In the process of breeding crabs, the water should be changed every half month in the spring and autumn of each year, and when the temperature is high in summer, the water should be changed every other week, and the crabs like clean and clean water quality, the pH value of the pool water is best kept around, and the amount of dissolved oxygen should be controlled at more than 5 milligrams per liter.

Usually one acre of land can produce 160 to 200 catties of crabs. But one acre of excellent crab field can also produce about 300 catties of crabs.

1,200 crab seedlings are put into one acre of land, and the survival rate is about 70%.

Crabs are crabs that grow in freshwater and breed in seawater. Before reproductive migration, they are all juvenile crabs, because their shell color is yellowish, and they are vulgar"Yellow crab"The gonads are small and largely undeveloped, and the weight of the liver is much larger than that of the gonads. It develops when it completes its last molt"Green crabs", the dark green gonads are fully developed, the male crab chelicerae is densely hairy, the foot bristles are thick and long, the female crab's abdomen completely covers the ventral surface of the cephalothorax, and the bristles on the edge of the abdomen are long and dense. Wang rent.