I. Pond Selection and Treatment
1. Pond conditions There are plenty of water sources around the pond, and the water quality is good. It is far from the discharge of industrial sewage. The pond should be open, and it can promote the dissolution of oxygen in the air and the release of waste gas from the pond. The best area is 30 acres.
2. Before clearing the crab pool, you must take care of the pond. A few key actions are:
(1) It is better to remove excess silt and mud thickness by 10 cm. Deterioration of water quality during the breeding process, landing of the crabs or even death, algae outbreaks, and lack of oxygen at the bottom all have an absolute relationship with silt. Clear work in the clear pond can reduce the use of drugs in the breeding process and save expenditure.
(2) The treatment practice of wild fish in ponds shows that the wild fish in the pond can provide abundant live bait for crab breeding and also bring more value to the farming. A small pond can be prepared in front of the clear pond to catch the miscellaneous fish shrimp into a small pond and clear the pond. In this way, the clear pond work can be well done. Those miscellaneous fish and miscellaneous shrimps can also guarantee the supply of live baits for the second year of crab cultivation, which can reduce costs.
(3) Lime treatment Generally, quick lime (75 kg/mu) shall be applied 20 days before the exposure of the pond to release of crabs for disinfection. Lime clear pond can provide the calcium needed for crab growth, can improve the acidic bottom environment, and can also play a role in disinfection.
(4) Some pumpkins and soybeans can be grown on the side of the pond. This can reduce the cost of farming.
Second, dunk crab purchase and stocking
1. How and when to purchase Seeds can be purchased as often as possible at familiar, well-respected nursery or seed suppliers. Can be purchased before the year, but also after the year 2 to March. It is best to put the crab in a small pond for a certain period of time in order to gradually adapt to the new environment.
Long-distance transport of crab or large-eyed larvae, due to transport will lead to seedlings depleted energy, decreased vitality, in the next pond, you need to use "new Miao-Kang" for treatment to restore the deduction crab physical fitness. This can increase the survival rate after deducting crabs in the pool.
2. Stocking specifications and density Many farmers believe that high-density stocking can make money, so they tend to put 1,000 or more, and stocking specifications are also small. They hold an idea: Anyway, put more money, and you can always make money at the end of the year. In fact, this is a wrong business idea!
If you want to make money, choosing the right size and thinness is the right way. The suitable specifications for stocking crabs are 50 to 100/500 g, and the stocking number per mu can be 250 to 600.
Third, the early pond ecological environment
1. Species planted in aquatic plants include Elodea, Hydrilla verticillata, Vallisneria, etc. Among them, the former two kinds of aquatic plants are better, and the types are required to be more than two. Planting area is 1/3 to 2/3 of the water surface. When the quality of the summer is poor, the crabs can easily pinch the bitter grass and damage the water quality. Some plants will naturally die in the heat of the summer. The prevention method is to cut those easily-dead plants halfway under water before the high temperature comes.
2. Reasonable stocking of snails and stocking snails can increase the proportion of large crabs, reduce feed feeding, reduce the possibility of water quality deterioration, and reduce the incidence of deaths and diseases. A certain amount of snails can significantly inhibit the outbreak of summer algae. . The screw can be purchased in the year before. This time it is cheap and it will be acquired during the breeding process. The price will increase. The suitable amount of stocking is 200-300 kg/mu.
3. Algae cultivation crab breeding or water (culture algae)? Practice has shown that in the early stage of cultivation, the application of certain fertilizers and aquatic products to cultivate natural food can promote the growth of crabs.
4. Microbial Water Modification When the water temperature gradually increases from April to May, complex microorganisms or EM bacteria should be used to regulate water quality.
IV. Improvement of early nutritional conditions Theoretical studies and aquaculture practices show that early supply of nutrients for crabs is critical, and is an important factor in determining whether they can eventually develop into large specifications! Early provision of sufficient nutrients will enable the crab to shell out and grow large before the summer heat season. In this way, the large format can be formed in the end!
1. In early culture, it must be ensured that there is enough animal protein to rely on corn, pumpkin and other coarse grains. It is difficult to obtain large specifications. Some people say that the cost of feeding a good feed is too high and it is easy to use water. The cost of feeding small fish is also too high. In fact, analysis of the so-called high cost is due to the small size of the crab. Why is the specification small? The lack of sufficient animal nutrition supply in the early period is the main reason!
2. In the pond water must be added enough minerals Minerals are very important nutrition, which is often easily overlooked by the majority of farmers.
Years of research have found that in the early stage of culture, it is very important for the pool water to contain enough types and amounts of minerals. It can promote the growth of shells and promote the smooth pods. Without sufficient minerals, shells cannot be shelled in time, so shelling can be delayed or even without shelling. These minerals are mainly obtained from water. Therefore, experienced fish farmers will find that: In the early stages, more minerals will be supplemented and the shells will be shelled in the early stages, and later will be able to grow into large sizes.
Some farmers use quicklime or calcium phosphate, which does not fully supplement minerals. Lime only contains calcium. Improper use can easily cause death of aquatic plants and crabs. The improper use of phosphorus and calcium can also cause bad water. Its mineral composition is also single and cannot meet the needs of various minerals.
Fifth, a variety of varieties with a reasonable technology collocation mode, can bring huge profits for the crab breeding production! It is a trend that the cultivation of single crab breeds and the use of river crabs in combination with other breeds is a trend. There are scientific reasons! The varieties that can be paired are squid, grass carp, green prawns, and white peony. Matching varieties, quantities, specifications and stocking times are key technologies.
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