What should be paid attention to during the stocking process when breeding hairy crabs in captivity

The scientific name of hairy crab is Chinese mitten crab. With the fast and convenient transportation and the improvement of people's living standards, the food on the table is becoming more and more abundant, and hairy crabs are also recognized by more and more people. More and more people are breeding hairy crabs.

The ** of the crab depends on the size of the individual. The larger the individual, the higher the crab's **. The size of individual crabs depends on the number of shells shed, sufficient food, good water quality, and an open breeding environment.

Giving hairy crabs enough activity and meeting these requirements can greatly improve the quality and survival rate of hairy crabs during the shelling period.

1. Sufficient food, with feed pellets and frozen marine fish as the main feed, appropriately increase aquatic plants such as black algae, bitter grass, snails, etc., balance nutrition, and improve the vitality of crabs. Summary: Only by roughly calculating the daily feeding amount of hairy crabs, combined with observation, can we achieve accurate feeding, accurate feeding, in order to meet the nutritional needs of the normal growth of hairy crabs, improve the survival rate, and improve the cultivation specifications.

2. Good water quality environment. Microbial preparations are used every 15 days to improve the water environment, and algae and plankton such as cyanobacteria and bollworms are regularly measured. Plankton should be used with caution, kill algae and insects, change water frequently, and replenish beneficial algae. Inhibits the growth of non-beneficial algae.

3. Open breeding environment. Put about 550 crabs with 3-4 grams per acre of land to give the crabs enough space to move. Water is the foundation of aquaculture.

Without water, it is impossible to raise good crabs. Therefore, it is important to ensure a stable water supply in any case. First, pay attention to the water source is not polluted; Pay special attention to drains and pipes that are easy to flush away on rainy days.

Raising hairy crabs requires a lot of experience. Some people can't make money for many years. During the feeding process, it is necessary to pay attention to changes in water quality at any time.

There are not many aquatic plants. Green grass should be cleared at all times. When the weather is too hot, pay attention to supplementing water with oxygen every day.

The water is too high to drain water. The liver needs to be replenished! Crab seedlings need to be bought in large ones.

The hairy crabs raised in this way are big and full!

First of all, the pond should be disinfected in advance, and then aquatic plants should be planted in it, and good crab seedlings should be selected.

It is necessary to pay attention to the way of putting hairy crabs, but also to the breeding process, but also to pay attention to the water source, but also to pay attention to the state of the water source, but also to pay attention to the water quality, and to pay attention to the protection of hairy crabs.

When breeding hairy crabs, it is very important to test the water quality. Before putting it in, we must ensure that the water source is sufficient, and do a good job of sterilization and disinfection to avoid death.

Crab is an umami that many people love to eat. Although there is not much meat in crabs, many people have a soft spot for crab paste and crab roe. Crab farming has also become a good wealth project this year.

A lot of people want to join Crab. In the ranks of aquaculture, the following will introduce you to the key points of crab farming, so that you can understand what needs to be done in crab farming.

1. Pond cleaning and water level control: After breeding last year, drain the pond water, remove the silt above 10cm at the bottom of the pond, and dry the frozen soil of the pond. Crab seeds can be disinfected with quicklime 15 days before stocking, and the dosage is 150-200 kg.

After the seedlings are released in early spring, the water level should be controlled at about 40-60 cm. It has three major advantages:

It can effectively balance the temperature difference between day and night and reduce the occurrence of crab diseases.

It can effectively avoid light, create a more suitable environment for the first shelling of river crabs, expand the water space, and prevent insufficient dissolved oxygen.

2. Reasonable fertilization: water must be fertilized before seedlings are replenished, and water quality is required to maintain a certain concentration during the breeding process, which is very important to improve the market specifications of river crabs. Especially in the early stage of breeding, when the water quality is thin, fertilizer should be applied. "Fertilizer Expert" and "Fertilizer Treasure" are commonly used fertilizer waters.

Grow aquatic plants and snails:

1. Planting aquatic plants: The planting area of aquatic plants is: submerged plants account for 1 3 of the total planting area, and the main species are bitter grass, hydrangea, elosophylla, etc.

Phytoplankton accounts for 1 3 of the total area of cultivation, and the main varieties are water peanuts. The submerged plants planted in the pond can be separated and fenced with nets to protect the germination of aquatic plants. Floating plants and submerged plants are combined with each other to avoid a single species, and have a spatial distribution to facilitate the formation of wind and waves and promote the exchange of water vapor and substances.

2. Snail release: snail snails can be used as high-quality animal feed for river crabs, and also have the function of purifying the water quality of the breeding pond. However, too much input can easily cause the water to become too thin, and moss will multiply.

Before Qingming, 250-300 kg of snails can be placed per mu, and another 200 kg per mu can be put from June to August.

Feeding of bait: The types of bait are divided into plant feed, animal feed and compound feed. Plant-based feed can be used for soybean cake, peanut cake, corn, wheat, potato and various aquatic plants; Animal feed can be used for small trash fish, snails and mussels, etc.; Compound feed should use conventional feed produced according to the growth and nutritional needs of river crabs.

It should comply with the standards of GB13078 and SC1052. According to the growth characteristics of river crabs, the ratio of animal and plant feed in spring is 60:40, and the feeding amount is controlled at about 1% of body weight.

There are four rules to follow when feeding, preferably at the waterfront junction. For self-prepared feed, it is necessary to supplement river crab compound nutrition enhancer and chisin in time.

According to the growth law of crabs, they grow the fastest in summer, we must master the time, at this time a large number of nutritious bait can make them grow bigger, feeding bait contains cereals and an appropriate amount of fresh fish and ice fish. In autumn, hairy crabs are about to be produced, and it is the time to raise fat, so we need to increase the proportion of bait and give them foods with high protein, so that they can grow fatter and more delicious. Artificial animal bait mainly includes snails, clams, mussels, silkworm pupa, mealworms, earthworms, small trash fish, fly maggots, livestock and poultry offal, etc.

Artificial plant-based baits mainly include soybeans, soybean cakes, vegetable cakes, cottonseed cakes, wheat, rice bran, bean dregs, distiller's grains, sauce residues, peanut cakes, etc.

The different growth and development stages of river crabs have certain requirements for bait types and specifications. After the crab species are stocked, they should be fed mainly with animal bait (about 70%), and the small trash fish and commercial feed should be crushed and processed into a certain specification before feeding, and wheat, corn, etc. should be pressed into flakes before feeding. With the growth of river crabs, the particles of bait should also increase accordingly, so that they can bite with a large sting, increase the palatability of bait, and improve the utilization rate of bait.

In the high temperature season of the month, it should be fed with plant-based bait, supplemented by animal bait, especially some vegetables, wheat, etc., plant-based bait can account for 75% of the total bait. Animal bait can be fed to a part of live snail clams for river crabs to prey. In the later stage of the growth of river crabs, mainly from the beginning of September, the feeding amount of animal bait should be gradually increased, and the animal bait can account for 50% of the total daily bait at the highest time, so as to fully meet the nutritional needs of the later growth of river crabs, accelerate the growth of river crabs, accumulate nutrients, and increase body weight.

Fish meal 21%, soybean cake powder 16%, vegetable cake powder 15%, corn flour 16%, bran 18%, sweet potato powder 10%, vegetable oil 3%, organic salt additives 1%. Huitin added to the total amount of feed.

Crabs are omnivorous crustaceans, and animal food includes fish, shrimp, snails, mussels, earthworms, aquatic insects, plankton, etc.

If you don't know anything about crab farming, you can try it. How do you know if you don't try? The first is love, love to do things is relatively easy, for crab farming, after decades of development, the breeding technology has been relatively perfect, and the breeding process is relatively easy.

For beginners, the area can not be made too large, the crab yield is not high, and at the same time, the ** of different specifications will be very different, and the ** of a specification is very different, and the high-specification crabs can be sold at a good price. Breeding starts from seedlings, generally speaking, for the breeding of crabs, the main seedlings come from Shanghai, Jiangsu, Anhui and other provinces and cities, for the selection of seedlings, this is very deep, it is best to find people who know how to control together.

The breeding process is basically according to the breeding procedures, basically the cost of one mu of crabs will be more than 5,500 yuan, the cost is still a bit high, and the novice is still leisurely. How to make the area bigger will be very stressful, and the financial pressure will be very great. Pay attention to escape, as soon as the autumn wind blows, the crab's feet will itch, and the crab will run very fast, and if you don't do a good job of escaping, the crab will be crushed to death.

No matter what kind of breeding, it is difficult at the beginning, visit some successful people, take some real scriptures, it should be said that raising crabs is not very difficult. Success needs precipitation, breeding needs to slowly accumulate experience, I hope everyone can go better and better on the road of crab farming. In order to improve the survival rate of juvenile crabs and increase economic benefits, cotton crabs must be cultivated first.

In order to meet the standards of commercial crabs, most people are temporarily raised in plastic greenhouses. Choose a pond with good water quality, sufficient water, convenient drainage, no leakage, no seepage, and less silt, the area should not be too large, the depth should not exceed meters, the pond shape is good, the sun is sufficient, and the construction of greenhouses can refer to the construction method of agricultural vegetable greenhouses. 15-20 days before stocking crab seedlings, disinfect with quicklime, cultivate basic bait, transplant aquatic plants (must be strictly disinfected), and establish the necessary anti-escape measures.

After the crab fry enter the pond, the water should be shallow to increase the water temperature and promote the growth of algae and aquatic plants in the water. Feed soybean milk, fish, shrimp, etc. 2-3 times a day, and pay attention to the weather, water quality, and crab seedling growth at any time, depending on the number of bait organisms. At the same time, some plant bait should be added during the growth of young crabs, such as duckweed and other high-quality aquatic plants.

In the daily management, we should pay attention to water quality regulation, master the water quality and cooling, change the water frequently, change the water less, do not cause drastic changes in water temperature and water level, and the purpose of crab farming can be achieved in about 2 months.

There needs to be aquatic plants, the water quality requirements for crab farming are very high, the temperature must be adjusted when the weather is hot, and oxygen generators and fresh fish fry should be used, which are all places to pay attention to.

It is necessary to pay attention to the diet of crabs, the oxygen in the water of breeding crabs, observe the physical condition of crabs, pay attention to the species of crabs, and the temperature in the water.

The temperature of the water in which the crabs are farmed, how deep the water should be, the environment in which the crabs are fed, the oxygen in the water.

<> hairy crabs like to live in clear, dissolved oxygen water next to the celery, control the pH value between 7-8, and change the water regularly to ensure that the water quality is clear and clean; Control the temperature to about 25 degrees; Hairy crabs are afraid of strong light and prefer to stay in low-light environments; If you are breeding in a lead oak pond, it is best to set up several aeration equipment to supply oxygen regularly.

As long as there is a suitable breeding environment, such as clear water quality, abundant aquatic plants, weak light and reasonable water temperature, river crabs can grow normally.

Let's take a look at the conditions needed to breed river crabs and what to pay attention to.

First, the water source is sufficient, the water quality is fresh and pollution-free.

River crabs are very sensitive to water quality, and unqualified aquaculture water bodies are not good for raising crabs.

If the crab pond enters the polluted water, it will accumulate toxicity in the body of the river crab, affect the quality of the river crab, and be harmful to the human body when eaten; In the worst case, river crabs will die on a large scale, causing important economic losses.

Second, the construction of the living environment should be reasonable.

River crab breeding should not only have sufficient water sources, wide water depth, convenient drainage and irrigation, less sludge, fresh water quality, and abundant bait sources, but also build a good living environment for river crabs according to the characteristics of river crabs.

There should be a deep water area and a shallow water area, and the ratio of the area of the deep and shallow water area should be more than 3 1.

3. River crab seedlings should be free of pathogenic microorganisms and the introduction and use of diseased or pathogenic latent and unsterilized seedlings, when the conditions for the disease are ripe, it can cause an epidemic or pandemic of a certain crab disease.

When buying river crab seeds, they should be tested for pathogens and disinfected before putting them in the crab pond.

Practice has proved that most of the crab species introduced from the affected areas will get disease, and healthy crab species will rarely get sick.

Fourth, there should be a reasonable breeding model.

In the process of raising commercial crabs, some crab farmers will always raise a part of the baby crabs in the month, and at the end of the harvest, they catch mature crabs, and the remaining crabs continue to be reared, and the baby crabs are replenished in the following year.

For this breeding model, they not only do not see its harmfulness, but think that it is a good way to raise crabs, and as a result, the phenomenon of large crabs and enemies killing small crabs and soft shell crabs is very serious.

The correct approach is: the stocked river crab seedlings should ensure that the specifications are consistent, and the pond should be thoroughly cleaned and disinfected for a breeding cycle.

Fifth, the feed nutrition should be reasonable in the process of crab raising, some crab farmers do not feed enough bait, so that the growth of river crabs is slow, and the body is thin; Although some bait is more, the quality of the bait is poor and cannot meet its nutritional needs; Some of them are only fed with plant-based bait and do not feed animal-based bait, resulting in protein deficiency.

These incorrect practices make the river crab lack of nutrition, and its disease resistance is weak, so the probability of various diseases will be higher.

Therefore, in order to raise a good pool of crabs, it is necessary to raise and manage them according to the nutritional needs of river crabs, so that river crabs can grow healthily.