There are risks associated with farmed pike crabs, how to reduce the risk of farmed pike crabs?

In recent years, with the continuous expansion of the scale of crab farming, the production of seedlings has broad prospects. Some nurseries have introduced swimming crabs for seed production. In the process of crab seedling breeding in spring, a large number of deaths often occur, which seriously affects the yield of crab seedlings, increases the cost of seedlings, and reduces economic benefits.

It is a common desire of many nurseries to study the causes of spring mortality of pike crab parents and to carry out effective prevention. Now according to my production practice, I will talk about some experience, I hope to help the majority of seedlings.

<> is another year crab seedling season, according to the survey, affected by the future market trend of crabs, this year Xinghua farmers generally increased the density of seedlings to 1200-1300, or even 1500, in order to increase the crab production to about 300 catties. So, does increasing density necessarily lead to higher yields? Will the size of the crab be affected?

What are the risks of increasing density for growth patterns? How can it be prevented?

How to prevent and control the risks of increased density to crab farming? What are the risks of increasing density for crab farming? At the beginning of farming, the water environment problems of the ring ditch increased, such as more crabs, more activities, more food, more bait and feces.

The water in the annular ditch is easy to become turbid, and the aquatic plants are sticky and do not grow. In the early stage of breeding: in the annular ditch, the density of crabs is large, the survival rate and growth are limited, the crabs are environmental animals, the water quality is not fresh, and the molting is doubled; The aquatic plants are weak and eat many people.

How to prevent and control the risk of crab farming caused by increased density? The harvest time of swimming crabs is in late autumn, and the weight of swimming crabs can not be harvested after the weight increases, and they should be fished according to the ** and weather conditions of swimming crabs, and they are generally not fished in rainy weather. Capture Considerations:

After catching the crab, the two turtle feet should be tied with rubber bands to prevent the crabs from biting each other or escaping in the basket or bucket. In summary, this is the end of the introduction of the management method of swimming crab breeding. If you want to breed swimming crabs well, you must do a good job in scientific management.

If you want to improve the survival rate of pike crabs, you must pay attention to its water quality, you must keep it at 12 32, and you should give them red threadworms or egg yolks for daily feeding, which will make their physique better, and you can also give them fish feed, dried shrimp, mussel meat, and clean them in the pool from time to time to avoid bacterial invasion.

We must choose high-quality varieties, we must replace water resources in time, we should also do a good job of ventilation and water exchange, we must pay attention to the breeding density in the breeding process, we must choose high-quality varieties, we must do a good job of anti-virus work, we must choose high-quality feed, we must pay attention to the temperature of seawater, and we must pay attention to the changes in air temperature and air pressure.

To choose the right species for breeding, we must choose the right place for breeding, pay attention to the temperature, pay attention to the environment of crab roe crabs, be sure to pay attention to the feeding situation, and pay attention to whether there is any disease.

The pond area is generally 10-20 acres of small and medium-sized ponds, and it is necessary to choose ponds near the sea area with sufficient water sources, no pollution, abundant resources of small miscellaneous fish, shrimp and shellfish, and convenient inlet and drainage. The depth of the pool should be more than 5 meters. The bottom of the pool is better with sediment, and the bottom of the pool should be covered with sand about 15 cm.

The female has a round umbilicus with villi hairs, and the shell surface is ochre or spotted. The crab meat is fat and delicious, has high nutritional value and economic value, and is suitable for temporary breeding and fattening of seawater. cephalothorax fusiform, almost twice as wide as long; The surface of the cephalothorax is covered with fine particles.

Barracuda crabs like to go ashore to rest, so there should be plenty of open space around the pond for them to rest, preferably on a slope. Put an appropriate amount of fine sand at the bottom of the pond to satisfy the crab's hobby of diving sand. The pond water should not be too deep, and it can be about 4-6 meters long.

It is more convenient to change the water source, and sometimes they prefer to rest on the shore, so it is necessary to provide him with some sufficient resting places, preferably a small amount of fine sand on the slope to satisfy their hobby of killing, and keep the water in the pond at four to six meters.

Barracuda crab farming is good and can be sustainable, but the texture and taste are always different from those of the wild. Breeding is destined to be feeding, and the wild is meant to hunt on its own. The biological chain is destined to be stronger and more flexible, so the meat in the wild and the size of the crab will be larger.

There is also artificially bred seedlings, and the selection of seedlings should be carried out according to the following standards: neat specifications; The shell rate is less than 10%, which is about 2 years old; Examination of chelicerae, less than 5% of the two absent ones; The individual is robust and vigorous, with a 100% carapace upward rate, and the opposite is not good.

The Yellow Sea and the Bohai Sea, the East China Sea is the most distributed, followed by the South China Sea, the Yellow Sea and the Bohai Sea are the least, at present, China's pike crab mainly includes the three-wart pike crab, the red star pike crab and the far-sea pike crab, among which the three-wart pike crab has become an important breeding species in China's coastal areas. Barracuda crabs prefer to eat small fish and shrimp to maintain their internal nutritional needs. Finally, it is important to pay attention to the oxygen content in the pool, and do not cause a large area of barracuda crabs to die of hypoxia and get sick because of the low oxygen content.

It is necessary to clean up the silt of the breeding pond in advance, carry out disinfection and sterilization, and repair some of the pond's supporting facilities to prevent the pike crab from escaping.

Barracuda crabs have water temperature requirements of more than 18 and are generally stocked in May and June.

It is necessary to inspect the pond once in the morning and evening to observe the feeding and activity of the pike crabs, and adjust the feeding amount and water exchange in time.

Be sure to choose good pike crab varieties and do a good job of water quality management.

Learn some precautions for breeding in advance, arrange them in strict accordance with the living habits of these pike crabs, and observe their state at all times.

We must maintain the quality of water, clean and regularly do disinfection and sterilization work, regularly clean up the silt in the pond, and give enough nutritious feed, so as to grow better.

It is necessary to have proper light, and also to have sufficient water, but also to pay attention to ventilation, and to change the water in time, etc., these are the most basic conditions needed.

The breeding of pike crabs is caged, if there are conditions, you can choose cages in the sea for breeding, if there are no conditions, you can choose ponds for breeding, and then fill them with seawater to feed him regularly.

There needs to be a spacious breeding site, and the water needs to use salty water, because this crab grows in the ocean, and the water quality needs to be relatively clear, no pollution, and the water should not be put too much, and it is necessary to do frequent disinfection work, do a good job of drainage measures, choose the right feeding feed, and keep the water temperature at no less than 20 degrees all year round.

It is necessary to choose a large environment of about 15 acres, it is necessary to choose a place with abundant water sources, the pool must be made deeper, and there is no pollution, and it is more convenient to drain and enter the water.

1.Prepare a shallow pond with no pollution. The water in which the crab lives is not easy to get too deep. 2. Leave a part of the land, it likes to bask in the sun. 3.Adjust the water temperature according to the weather.

Pond conditions: When breeding pike crabs, it is necessary to choose a pond with clean water, no pollution and salinity to build a crab pond. Crab fry stocking:

From late May to mid-June each year, the crab fry are put into the pond with neat size, robustness and vigor. Bait feeding: Provide plenty of fresh bait for the crabs and clean up food residues regularly.

1. Pond conditions

Barracuda crab is a crab that grows in the ocean, so when breeding, it is necessary to ensure that the water quality of the pond is clean, pollution-free, and has a certain degree of salinity, and the water level of the pond cannot exceed three meters, and the water temperature in winter cannot be lower than seven degrees, so as not to affect the growth of the pike crab.

2. Crab fry stocking

In the process of raising pike crabs, you can choose natural and healthy or artificially cultivated crab seedlings, and the crab seedlings are required to be neat in size and have a soft shell rate of less than 10%.

10. Strong physique, complete appendages, strong vitality, and crab seedlings are stocked from late May to mid-June every year.

3. Bait feeding

When breeding pike crabs, it is necessary to provide them with fresh and palatable bait, and the amount of food to be fed can be determined according to the water temperature and feeding rate, so as to reduce the excretion of feces, ensure that the pike crabs are full and not wasted, and prevent food residues from polluting the water quality and affecting the health of the pike crabs.