There are many influencing factors in the aquaculture industry, how to reduce the risk of breeding r

What are the risks of increased density for crab farming? Before breeding: the environmental problems of the surrounding water are increasing, there are many crabs, the activity is large, the food is more, the residual bait excrement is more, the surrounding water is easy to be turbid, the sticky sewage grass does not grow, the difficulty of water transfer technology and the problem of grass are getting bigger and bigger, that is, the problem in the future, it is difficult to solve.

<> early breeding: the density of crabs in the ring ditch is high, the life and growth are restricted, the crabs are environmental animals, the water quality is not fresh, and the defoliation multiple is small; Aquatic herbaceous plants are not strong and die in large numbers. Risks associated with increased density of crab farming.

How to prevent and control? Middle and late stage breeding: Taita leeks have the risk of being caught by light grass, after the loose purse seine net, the leeks are clamped quickly, the last two shells are doubled small, the yield specifications are difficult to protect, and the risk of breeding is greatly increased.

Middle and late stage breeding: high crab density, pond environment is easy to deteriorate, soluble oxygen is reduced, and the double-layer back shell is small, resulting in crab specifications are generally smaller, but the number of recatches increases, but the yield is also difficult to increase significantly, on the contrary, ** is lower, the total profit may be lower, Beerus.

Risks associated with increased density of crab farming. How to prevent and control? How can the risks associated with increased density of crab farming be prevented and controlled?

Increase density, live within the limits of income, and discretization: small watershed ports, fine management, good external water, high level of breeding technology, can appropriately increase the density, and change the traditional breeding mode. Instead, it is prudent to increase the density.

After the density increases, the management of the front ring ditch culture should be strengthened to prevent and control the risk of the front ring ditch culture: increase the planting density of witch hazel and the number of spirulina, increase the activity space of crabs, and improve the self-purification ability of the water body.

Changing water, fertile water, detoxification, water diversion, changing the background, etc., to prevent and improve water environment problems. Shorten the operation interval of water quality regulation, increase the number of adjustments, adjust products and methods effectively, prevent in advance, and improve in time. Strengthen dietary management, do not discard dirty, polluting bait, reduce the pollution of bait residual excrement to the water environment, it is best to choose crab food, high protein, high absorption of high-grade crab food functional materials, at the same time, pay attention to observation, accurate and adequate nutrition, reduce pollution and crab activities, long-term keep the water environment fresh and fresh.

The breeding density should not be too large, keep the water environment fresh, disinfect and sterilize frequently, improve the self-purification ability of the water body, and reduce the pollution of the environment by the residual excrement of young children, otherwise it will cause germs.

Change the water frequently, disinfect and sterilize, the temperature should not be too low and not too high, the breeding density should not be too large, and do not feed too much when feeding the feed, otherwise it will cause germs.

First of all, the water source must be sufficient, the place must be large, and oxygen should be injected in time, the temperature should be appropriate, and frequent sterilization and disinfection should be carried out.

The outlook is so-so. River crab actually refers to a delicacy made with pike crab as the main ingredient, usually most of the crabs that people eat are artificially bred in lakes and ponds, that is, lake crabs, and those that grow in the river are called river crabs.

The development prospects are very good, and now people also like to eat some seafood products, and they also like to eat this kind of river crab very much, so it can meet some of people's needs, so it can also make a lot of money.

The prospect of farmed river crabs is very good, and the nutritional value of this crab is also very high, and the market price is also very high.

The prospect of breeding river crabs is still good, because in the seafood market, the preciousness of river crabs is also relatively high, and many people like to eat them very much.

The breeding cycle is about half a year to 8 months. Moreover, the breeding of river crabs also needs to learn some breeding skills and techniques, and the economic benefits are relatively good.

The breeding cycle of river crabs is 18 months, and after 18 months, they can be taken out and sold.

This cycle generally takes about a year, of course, if your breeding method gets, 9 or 10 months is also possible.

It usually takes about 10 months, because if the time is too short, these crabs basically can't grow and are very small.

Basically, it's all in years, because many breeding factories have actually been doing it for many years, otherwise they wouldn't have such a large scale.

Yangcheng Lake is beautiful, Bacheng crab is fat. In the hands of people"The turtle is full of tender jade, and the shell is convex and red and fragrant"When the hairy crabs in Yangcheng Lake are born, they rarely think about the prospect of hairy crab breeding. Today, when the water surface resources of Yangcheng Lake in Suzhou are increasingly protected and restricted, the exploration of the road of large-scale breeding of hairy crabs is imminent.

Suzhou Yangcheng Lake is a constant shallow water lake, whether it is a big water or a small water, the water level of Yangcheng Lake is always maintained between meters and 2 meters, the sunlight penetrates the bottom of the lake, the light is sufficient, which is conducive to the growth of aquatic animals and plants, and provides a rich natural active bait for the hairy crabs in Yangcheng Lake. The unique hard plate bottom mud at the bottom of Yangcheng Lake is like a cement floor, and hairy crabs crawl on it every day to exercise, just like"Athletic"...The specific geographical and ecological conditions of Yangcheng Lake in Suzhou have created the unique quality of Yangcheng Lake hairy crabs, with thin shells, high meat content and sweet taste.

Therefore, the cultivation of hairy crabs in Yangcheng Lake is the key. Just like tea leaves, the same tea leaves taste different in different places. This is especially true of the hairy crab in Yangcheng Lake, which must be kept in Yangcheng Lake in Suzhou.

Even if you keep it on the shore of Yangcheng Lake or on the shore, you can't do it! Because the unique taste of hairy crabs in Yangcheng Lake is determined by the water quality, water depth and geology of Yangcheng Lake in Suzhou. Therefore, in the breeding method of hairy crabs in Yangcheng Lake, family farming is still classic!

Nearly 30 people from four generations of our family have lived on the shore of Yangcheng Lake in Kunshan, Suzhou, Yangcheng Lake hairy crabs are our livelihood, and the family has been fishing and breeding Yangcheng Lake hairy crabs for a living. The combination of the precipitation of Yangcheng Lake hairy crab breeding experience and the current breeding technology has made the Yangcheng Lake hairy crabs bred out of the body fat and full of yellow foot! Suzhou Yangcheng Lake hairy crabs are favored by the world, our family united, go all out to breed Yangcheng Lake hairy crabs, the whole family of Yangcheng Lake water surface totals more than 600 acres, so there is a sufficient supply every year.

The joint farming of the family not only maintains the original flavor of the hairy crabs in Yangcheng Lake, Suzhou, but also brings us economies of scale. If hairy crabs in Yangcheng Lake want to be scaled up, family joint breeding is an option.

It is to breed this river crab well, try to increase the production of river crabs, and then find a good market to sell it.

When selecting seedlings, choose some people with strong environmental adaptability, and to carry out scientific and reasonable feeding, you can carry out some stocking, and pay attention to the prevention of some diseases.

Water splashing method: 1 kg of Yifuyuan EM bacteria per mu, add the same amount of brown sugar, first melt the brown sugar with warm boiled water, add a small amount of water, adjust the water temperature to 30-40 degrees, pour the bacterial liquid to seal and ferment for 2 hours, and then dilute 200-500 times and then splash the whole pond or around the pond, or dilute the Yifuyuan EM bacteria and splash them directly on the water surface of the fish pond.

River crab, in fact, is the dialect of the crab refers to the traditional local cuisine of Wenzhou. Generally, March to May, September to October is the production season, and now there are more farmers who breed, so what are the requirements for the environment of river crab farming? Pond requirements.

Farmers should choose a place with convenient transportation and quiet environment, requiring sufficient water sources, good water quality, no pollution, and convenient drainage and irrigation. The bottom of the pond should be flat, and the slope ratio of the ridge should be about 1:. Water quality requirements.

The water temperature of the river crab should be above 18, the daily temperature difference should be less than 8, the salinity should be 18-32, the pH value should be, the ammonia nitrogen content should be less than 1 milliliter of water, the dissolved oxygen content should be greater than 5 milligrams of water, and the transparency should be kept at 30-40 cm. Requirements for aquatic plants.

<> aquatic plants are one of the natural baits that river crabs like to eat, which can play a good role in purifying water quality, and are the places where river crabs live and avoid enemy damage. The area of aquatic weeds should account for more than 70% of the pond area, and the main varieties are podocarpus, podocarpus, podocarpus, podocarpus and so on. Among them, velvet and velvet are mainly transplanted and cuttings, while velvet is mainly sown.

The Mid-Autumn Festival is coming, the duck's ** is very high, the same specification of the duck ** will be four to five times higher than under normal circumstances, many farmers will be able to catch up with all the crabs on the market, but the growth of crabs needs a complete cycle, the quality of crabs that are not fully matured is relatively poor, paste-like, soft shell, consumers He Bi tasted the river crab after a negative impression, this negative impression will cause a certain Zen slip lifting harm to the development of the entire river crab industry. In order to ensure the quality of each crab, the crab shop sells **, but also to ensure the quality of the crab, the brand reputation is priceless, only the quality of the product, in order to be able to develop in the long run.

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In the process of breeding, it is necessary to do a good job of disinfection measures, regularly disinfect the pond, pay attention to planting some plants in the crab pond in the pond, and meet the daily food needs of the crabs.

There should be a good water temperature, the pH value should be appropriate, the water quality should be clear, the light should be sufficient, and there should be enough aquatic plants in the wild to be used as food, and it should be intercepted to avoid the crabs from running away.

It is necessary to pay attention to the selection of varieties, pay attention to the breeding environment, pay attention to the water situation, need to choose the right crab seedlings for breeding, and pay attention to the feeding method.

Be sure to choose a place with sufficient water sources, the bottom of the pond should be flat, the water quality requirements are relatively high, there can be no pollution, and the water temperature is best above 18 degrees.

Compound aquatic plants are planted around the pond and planted with elophyte, black algae, bitter grass, water spinach, duckweed, etc. In deep waters, wormwood, reeds, etc. are planted. in shallow waters.

The coverage rate of aquatic plants should reach more than 50%. 7-10 days before the timely application of basal fertilizer to stocking the fry, add about 50 cm of water and put in the fermented and sterilized livestock manure, the amount is 200-300 667, to cultivate plankton and provide biological bait for crabs entering the pond. Place the snails 3 times instead of 2 times.

Volume 200-300 667. At this time, the temperature is suitable, and the young snails can be naturally propagated in the pond, and the young crabs continue to provide delicious live bait; The second release in June was around 100 667.

To control the growth of moss, at the beginning of moss germination, use biological disinfectants (main ingredients: compound active agents, bioinhibitors, etc., with a dosage of 20-30 ml 667 square meters (water depth 1 meter). The method is to dilute 2,000 times with water and sprinkle it on the place where the moss is concentrated.

When in use, start the machine to increase oxygen. Smaller ponds can be salvaged by hand. Fifth, scientific feeding and feeding should adhere to the principle of "five determinations", that is, timing, fixed-point, quality-assured, quantity-guaranteed, and fixed-person.

From March to May, compound feed with protein content of 36%-40% is the main feed, supplemented by some fresh ice fish; From June to August, it is mainly fed with compound feed with protein content of 28%-30%, supplementing some corn, wheat and other grains; From September to October, the fish is mainly cooled, supplemented by pellets with a protein content of 38%-40%.

Feed twice, once on each side, taking the lead, accounting for 60%-70% of the feeding amount. The feeding amount should be completed within 2h. Ponds require farmers to choose places with convenient transportation, quiet environment, abundant water sources, good water quality and pollution-free, and convenient drainage and irrigation.

The bottom of the pond where river crabs are farmed should be flat, and the optimal slope ratio should be about 1:. Water quality requires that the water temperature of river crabs should be above 18, the daily temperature difference should be less than 8, the salinity should be about 18-32, the pH value should be about about 1, the ammonia nitrogen content should be less than 1 mg l of water, the dissolved oxygen should be greater than 5 mg l of water, and the transparency should be kept at about 30-40 cm.

The planting area of aquatic plants should account for more than 70% of the pond area, and the main varieties are black algae, bitter grass, and elophylla. Black algae and Elophylla were mainly transplanted and cuttings, and sowing was mainly used for sowing of bitter grass. Requirements for anti-escape facilities In order to build anti-escape facilities for river crab breeding, you can choose cement brick walls, calcium-plastic board fences, polyethylene mesh fences and other forms.

At present, the calcium-plastic board fence widely used by farmers can bury the calcium-plastic board into the soil around the ridge for about 20 cm, and then compact, and fix it with wooden stakes every 1 meter to prevent river crabs from escaping.

The scale of river crab breeding is constantly expanding, the river crab breeding methods are as follows, method one, the water quality must be good, if the water quality is not good, the crab raised is not fat, so water is one of the keys, method two, the feed must be selected, good feed can make the production of river crabs more, method three, must prevent virus invasion, or bacterial invasion, can not make river crabs sick, otherwise it will cause a large number of deaths.