What conditions do you need to raise hairy crabs?

Hairy crabs, presumably many people like to eat, editors also like this kind of food, but not in coastal areas to buy this kind of hairy crabs will be a little expensive in price. With the increasing demand for hairy crabs in the market, many people began to invest in this aquaculture industry, thinking that it is very promising. However, the most important thing in breeding is to master the relevant aquaculture techniques.

How to breed hairy crabs

1. Seedling preparation

When using a net to prevent escape, sterilize and disinfect the pond, remove too much silt, leaving only about 10 cm of silt, and sprinkle it with quicklime, with a dosage of 200-250 kg per mu, in order to achieve thorough pond disinfection, remove impurities, kill germs, and improve the bottom quality. 7 days after the drug, that is, pass the water once, to remove the dirt, and then add water to the pond 3-5 days later.

2. Plant aquatic plants well

In order to cultivate hairy crabs, we should first plant aquatic plants, which is one of the natural bait of hairy crabs, and can play a good role in purifying water quality, and it is also a place for hairy crabs to perch and avoid enemies. It is mainly algae. You can also put in an appropriate amount of field snails.

3. Rational stocking

The crab seedlings should be disinfected before release, separated evenly according to size, and put in the water with a purse seine, so that the crabs can adapt to the environment for 1 month before the purse seine can be removed. In general, crab breeding should achieve the principle of "three suitability" and "one temporary breeding". That is, appropriate density, timely stocking, moderate specifications and temporary stocking before stocking.

4. Daily pond patrol

The main purpose of patrolling the pond in the morning is to check whether there is residual bait or not, in order to arrange the bait for that day, to measure the water temperature at noon, to observe the water color and the changes of the pond, and to observe the activity and eating of river crabs in the evening and at night. take timely measures when problems are found.

What conditions are needed to raise hairy crabs?

Hairy crabs live in seclusion or burrowing during the day and come out to look for food at night. Like the water body with clear water quality, sufficient dissolved oxygen and abundant water plants; hate fertile water, sewage, fear of hypoxia, and avoid bad water quality very obviously. Like weak light, afraid of strong light, like quiet, afraid of alarm. When the water temperature is more than 10 ℃, it begins to feed, molting and growing about 15 ℃, and the peak growth period is 20-28 ℃. High water temperature can inhibit the feeding, growth and molting of river crab.

Adult crab culture ponds should strive to meet the above requirements of the living habits of river crabs, so that hairy crabs live in an environment similar to natural conditions. The adult crab culture pond requires the following conditions:

1. The traffic is convenient, the environment is quiet, and the wind is facing the sun.

2. Abundant water source, good water quality and convenient drainage and irrigation.

3. The area is generally 5-10 mu. The area is too small, the water quality is not easy to be stable, and the management is inconvenient.

4. The depth of the pool is 1.5 meters, and the depth is 1-1.2 meters.

The slope of the pond is 1:3. It can greatly reduce the number of river crabs living in caves.

6. The shape of the pond is rectangular from east to west, narrow from north to south, with an aspect ratio of 5:3.

7. The ridge of the soil pool is wide, and the soil quality is tight, and the loam is better. The pond does not leak and the silt at the bottom does not exceed 5 cm.

Identification method of inferior crab seedlings of hairy crab

1. Drug-damaged seedlings

Repeated use of oxytetracycline and other antibiotics in artificial breeding can cause crab seedlings to molt and metamorphosis into child crabs, the body can not absorb calcium, carapace can not harden, often swim to the edge of the pool to die in large numbers.

2. Molting seedlings

If some of the crab seedlings have molted and metamorphosed into first-stage crabs, they can not be purchased, otherwise, a large number of crab seedlings will die after transportation.

3. Flower color seedlings

The body color of crab seedlings is dark and light, and individuals are big and small. This kind of crab seedlings, if they are natural seedlings, may be mixed with other kinds of crab seedlings, which is common in natural seedlings. If it is artificial breeding, it is the irregular development of crab seedlings, which is easy to kill each other when molting.

4. Seawater seedlings

The desalination of crab seedlings is not complete, and the seedlings are dark black. if they are directly cultured in fresh water, both natural and artificial seedlings will be in a coma to death.

Advantages of hairy crab releasing crab seedlings in winter

1. the price is cheap

The period from mid-October to mid-November is the period when a large number of crab seedlings are caught, transferred to the pool to survive the winter and sold. During this period, the price is low, usually about 1 yuan each, while in spring, the price of each crab seedling reaches 2 yuan to 3 yuan.

2. Transportation safety

The newly caught crab seedlings are rich in fat, strong physique, strong adaptability and resistance, and the temperature difference between the north and the south is only 5 ℃-10 ℃ at this time, the air humidity is large, easy to operate, simple management, safe and reliable transportation.

3. High survival rate

In winter, due to the clean water quality and the weakening of bacterial and viral activity, the chances of crab seedlings being infected by various bacteria are reduced, while in spring, crab seedlings are invaded by a variety of bacteria and reduce the survival rate.

4. Long growth period

The growth period of spring crab seedlings is only more than 6 months, except for the adaptation period, the growth period is shorter, the individual is small and the yield is low. Putting crab seedlings in winter can generally prolong the effective growth period of 1-2 months, which has a significant effect on increasing specification, increasing yield and increasing benefit.

This is the end of the culture technology of hairy crabs. I hope it will be helpful to everyone. At present, the prospect of hairy crab culture is very good, but the breeding industry will have certain risks, so we should not blindly follow the trend.