How to choose the site and pond structure of blue crab pond breeding?

1 Selection of breeding sites:To choose the breeding site of the blue crab, it is necessary to create a warm habitat in winter and cool in summer and a superior ecological environment for growth and development according to the requirements of the ecological habits of the blue crab. At the same time, it should also have the conditions to facilitate production and operation.

Specifically, the farms of blue crabs should choose an inner bay with less wind and waves, with good seawater exchange, smooth tidal flow, appropriate proportion of seawater, not affected by industrial and agricultural pollution, and the main water quality indicators meet the fishery water quality standards. At the same time, the fresh water source is sufficient, the transportation is convenient, the crab seedlings are convenient, and the site with sufficient fresh bait can be used for the breeding of blue crabs. But there are a few things to keep in mind:

Choose calm winds, smooth currents, and flat terrain. There are conditions for desalination and flood drainage, convenient construction, and small amount of work on both sides of the inner bay shoal or harbor road. The elevation of the bottom of the pond is equivalent to the tide level in the mid-tidal zone, and the water depth can be maintained above the meter after the tide.

The bottom quality is better to be sediment, if there is a lot of mud at the bottom of the pool, coarse sand or broken shells should be added to improve the soil. The specific gravity of seawater is always maintained and is not affected by infiltration water from the terrestrial ground. There are no pesticide factories or chemical plants nearby, and they are not affected by the situation of industrial sewage.

Low-value fish, shrimp, shellfish**abundant, convenient transportation, electricity**.

2 Crab pond areaIf the area is too large, it is difficult to drain and irrigate, and it requires a lot of manpower and material resources. At present, the seedlings mainly come from natural fishing, the quantity is limited, the specifications and quality are different, and the time of cultivation is also inconsistent, so it is necessary to feed in different ponds according to different specifications, the area is too large, and the seedlings are insufficient, which wastes the water surface and is difficult to harvest.

At present, many areas use idle shrimp breeding ponds to breed saw-edge blue crabs, with an area of 20 30 acres.

3 Crab Pond Construction:It can be divided into single pond, double pond and Tianzi-shaped pond. A pond and a gate are called single ponds, two ponds are close to three gates, and one of the gates communicates with two ponds called double ponds.

The four ponds are connected into a field zigzag called a Tian zigzag pond. Specifically, a saw-edge blue crab pond is generally composed of embankments, sluices, beaches, ditches, escape prevention and anti-fighting facilities.

The ditch is the main ditch of the pool, and when the inlet and drainage sluice is separated, the ditch is connected by the inlet sluice and the drainage sluice, and communicates with the ring ditch and the branch ditch. **The depth of the ditch is generally more than meters. The ring ditch is a ditch excavated along the pond embankment, in order to protect the embankment, there should be a certain distance between the ditch and the embankment foundation, generally 3 6 meters.

The annular groove can sometimes be used in place of the main groove. The branch ditch is the water ditch that connects the ** ditch and the ring ditch, and its width is half of the ** ditch. Generally, there are no branch ditches in crab ponds.

Only ponds with a large area have branch ditches.

It is necessary to determine according to the specific situation, try to choose a place with living water, so that we can better carry out aquaculture, and correct the depth of the pond and the size of the pond.

It is best to choose the inner bay with less wind and waves, the quality of the water is better, and the circulation is better, so that the breeding can be better.

Conditions of adult crab rearing ponds:

Convenient transportation and quiet environment; The water source is abundant, the water quality is good and pollution-free, and the drainage and irrigation are convenient; The bottom of the pool is flat, and the slope ratio of the pond is 1:.

Anti-escape facilities: There are three main forms: cement brick wall, calcium-plastic board fence and polyethylene mesh fence. At present, calcium-plastic fences are commonly used, and the calcium-plastic boards are buried in the soil 20 cm along the perimeter of the ridge and compacted, and the interval is 1 meter and fixed with wooden piles.

Sterilization and disinfection of the pond:

Remove too much silt, only leave about 10 cm of silt, sprinkle the whole pond with quicklime, the amount per mu is 200-250 kg, to achieve thorough pond disinfection, remove impurities and remove wild, kill germs, improve the substrate, 7 days after the medicine, that is, 1 time through the water to eliminate the dirt, and then add water after 3-5 days of drying the pond.

Aquatic plants suitable for planting in crab ponds:

Breeding a pond of crabs, first of all, we must plant a pond of grass, aquatic plants are one of the natural baits that river crabs like to eat, and can play a good role in purifying water quality, and it is a place for river crabs to inhabit and avoid enemies. The area of aquatic plants should account for more than 70% of the pond area, and the main varieties are melanophyllum rotifolia, bitter grass, elophyllum and so on.

Screws should be put in the crab pond:

Screws are one of the natural baits that river crabs like to eat, and they can purify water quality. Before the stocking of crab seeds, and in the market and harmony, 300-500 kg of fresh screws are put into each mu to cultivate the basic bait of river crabs.

Adult crab breeding ponds should have the following conditions: convenient transportation, quiet environment, leeward and sunny; The water source is abundant, the water quality is good, and the drainage and irrigation are convenient; The area is generally 10 20 acres, the area is too small, the water quality is not easy to stabilize, and the management is inconvenient if it is too large; The depth of the pool is 1 meter, and the depth of the water is 1 meter; The slope of the pond is 1 3, which can greatly reduce the number of river crab burrows; The pond is a rectangle long from east to west and narrow from north to south, with a length-to-width ratio of 5 3;The ridge of the pond is wide, the soil is compact, and loam soil is preferred; The pond does not leak, and the silt at the bottom of the pond does not exceed 5 cm.

1. Crabs need a clean water environment.

2 The area is from 10 to 30 acres, and the water depth is in meters.

3. The stocking density should be controlled at 10 to 200,000 per mu.

4. Let there be water plants.

5. Sufficient bait, otherwise the crabs will kill each other.

Plenty of water. Clean water. Abundant water resources.

1. Pond disinfection: When breeding crabs in the pond, it is necessary to remove excessive silt at the bottom of the pond, and sprinkle quicklime for disinfection and sterilization after drying for 20 days. 2. Crab seed stocking:

Select undamaged crab species and put them in the pond in February and March every year, and the density is maintained at about 550 crabs per mu. 3. Feed feeding: provide feed for crabs twice a day, and animal feed is the main one in the early stage.

1. Cleaning pond disinfection

Before breeding crabs in the pond, the water in the pond should be drained, and then the excessive silt at the bottom of the pond should be removed, and the thickness of the silt should be controlled at about 10 cm, and then dried for 20 days, and then injected with water, and 400 kg of quicklime per mu should be sprinkled to disinfect and sterilize and improve the quality of the silt.

2. Crab seed stocking:

When breeding crabs in ponds, it is necessary to select crab species with neat specifications, no damage, and sound limbs for stocking, and the stocking density is 500-600 per mu, and the stocking time can be selected between February and March each year, so as not to stocking too early, resulting in frostbite and death of crab species.

3. Feed feeding

In the process of breeding crabs, feed should be fed twice a day, once in the morning and once in the evening, and after each feeding 1-2 hours, the food residues should be cleaned up, and in the early stage of breeding, fresh fish and shrimp and other animal bait should be provided for the crabs, and plant feed can be increased in the later stage of breeding.

Blue crab is one of the more common crabs available in the market. If the breeding is better, the profit is still very considerable, so it has attracted a large number of people who want to enter the industry of breeding blue crabs, but the breeding process of blue crabs is still relatively complicated, and it is not very friendly to novices, so what are the experiences of breeding blue crabs?

Do a good job of regular inspectionsIn the process of breeding, many people put crabs in the water and don't care. But in fact, if you don't inspect it regularly, you can't find potential problems in the pond, so you must regularly inspect the canteen, not only thatObserve the water quality of crab farmingAt the same time, it is also necessary at the time of feedingObserve the specific situation of crab feedingThe overall state of the crab is judged according to the specific situation of the crab's eating.

In addition, in the process of inspection, we should also look at the design of the anti-escape equipment, if the anti-escape equipment is faulty, it must be repaired in time to prevent the crab from escaping.

If it's raining, it's going to be fineChange the water in the pond in timeBecause the quality of rainwater is very different from that in ponds, and most of the rainwater is acidic, which is not good for crab farming, it is also a potential threat.

Water quality is very important in raising crabs, and many people do not pay attention to water quality in the process of raising crabs, and there is often a lot of soil in the water. Usually people think that this kind of water quality is pure natural water quality, which can better raise crabs, but in fact, if you want to raise good blue crabs, then inIt is necessary to keep the water clean

This is one of the most important prerequisites for raising blue crabs. In addition, in the process of growth, blue crabs will be shelled many times. In the process of shelling, the most important condition for blue crabs is the cleanliness of the water quality, if the water quality is polluted, then the water quality must be replaced in time, and at the same timeNote that the dissolved oxygen content in the water must be sufficientWhen the dissolved oxygen content is low, it may cause the crab to die quickly.

Feed should be selected carefully, in addition to the water qualityThe daily feed eaten by crabs is also more importantCrabs are actually carnivorous, so it is not recommended to feed some mixed feed in daily life, you can try to put some shrimp fish in the pond, or snails and shells stepped back from the river.

However, in the process of putting in, it is also necessary to pay attention to the appropriate amount, if you put too much at one time, the crabs can not be eaten, then the feed left in the pond will ferment, and there will be damage to the water quality, which will have a great impact on the growth of crabs.

Pay attention to the selection of water quality, and scientific management, and at the same time to ensure the survival rate of blue crabs, and pay attention to the breeding skills, pay attention to the selection of blue crab species.

The water quality must be clean, do not have any infectious diseases, and must pay attention to the light time must be sufficient. Be sure to inspect regularly, observe the eating situation of crabs, and the feed must be carefully selected, some shells or snails will be fed, and you must pay attention to the density of breeding.

It is important to pay attention to the density of the breeding, the selection of the species during breeding, the temperature of the water during the breeding, and the control of regular feed feeding, so as to ensure that these crabs grow very well.

Breeding box breeding is not suitable for feed, because the water is easy to be turbid and smelly, aquatic weeds to buy more at one time, or small crabs eat at one time, not enough to grow, can not form a sustainable breeding environment. Although the material conditions were provided, the baby crabs still died one after another, and in the end, only one male and one female remained. A check of the information, it turns out that in the small environment of the breeding box, only one male and one female can survive!

The small crabs will survive the fittest, kill each other, and strive for the last one-to-one breeding opportunity.

Understand their habitat and living habits, ensure that their water temperature is normal, the change is not too drastic, and the salinity must be adjusted appropriately.

Most people always think that crabs are creatures in the seawater, i.e. seafood. In fact, due to different species, crabs have different living environments, and generally speaking, they can be divided into two types: saltwater crabs and freshwater crabs. So, how to solve the problem of wanting to eat delicious crabs in the mainland?

Freshwater crabs can be raised to meet this need.

Freshwater crabs are dominated by Chinese mitten crabs in the Yangtze River system, and the world-famous Yangcheng Lake hairy crabs are of this typeIts characteristics are: white belly, yellow back, strong chelera, long legs, prominent eyes, and hairy chelae.

How can crabs be farmed in freshwater? Let's introduce the breeding technology:

1. Pond selectionThe pond of crab farming requires good water quality, convenient drainage and irrigation pond, the area should be large and not small, should be between 5 and 10 acres, and the water depth should be 1 to 2 meters. The pond mud should be shallow and not thick, and the anti-escape fence should be installed at the inlet and outlet, and the anti-escape net or brick wall should be built around it at the same time (the wall height is 50-100 cm). At the same time, in the range of 40 cm on the highest water level of the pool water, plastic plates, glass, polyethylene films, etc., the quality of anti-escape facilities is related to the success or failure of aquaculture.

River crabs are crustaceans, which grow up to a certain period of time and gradually grow through shelling again and again, so aquatic plants and other necessary hiding places for river crabs should be planted in the pond.

2. Stocking specifications and density of crab seedlingsThe stocking specifications and density of crab species are related to the production cycle, the current year juvenile crabs (each 3-4 grams, about 300 per kilogram), 2000-3000 per mu, 1000 small crabs can be put in the next year, after cultivating up to the commercial specifications of the adult crabs, some mild filter-feeding fish can be mixed in the crab pond, such as silver carp, bighead carp, etc., 100-200 per mu, so that the water quality can be cleaned, the residual bait after feeding the crab can be rationally used, and the breeding income can be increased, so as to achieve the purpose of reducing the cost of stocking.

3. Feeding managementIn addition to a variety of aquatic plants, fresh straw of crops, agricultural products, snails, animal scraps and fish and shrimp can be fed. When feeding, it can be carried out in the following proportions: animal bait accounts for 35%, plant bait accounts for 30%, green fodder accounts for 35%, and 1-2% edible salt is added to improve the feeding intensity and utilization rate of river crabs on bait.

The feeding is carried out according to the "four determinations" in the aquaculture method. The number of bait can be cast once a day when the water temperature is high in 5-10 months, and can be cast once in 2-3 days in early spring and late autumn, and each feeding time should be selected in the evening, and the feeding point should be selected on the west bank of the pond near the slope of the pond. Special Note:

When feeding in September and October, the content of calcium should be added to the bait in advance, which is conducive to speeding up the speed of shelling and shelling.

4. Water quality requirements and disease preventionRiver crabs have high requirements for water quality, oxygen content is more than 4 milligrams of liters, pH value is between one, the pool water should be controlled at 50-60 cm deep when just released, and then gradually deepened to one meter, and after 1-2 weeks to change the pool water of 1 3-1 4, change the water every 3 to 4 weeks in autumn and winter. In the process of feeding, it is necessary to frequently inspect the pond to check whether the escape prevention facilities are damaged and invaded by enemies, and regularly pour bleaching powder into the pond water to prevent diseases.