Pay attention to frequent water changes to keep the water level stable. Change the water once a week in spring and every 3 days in summer. If the high temperature persists, change the water every day. In autumn, the weather is hot and muggy weather often occurs, and the water quality is easy to deteriorate. Pay special attention to water changes. Change the water once every 2 days. The water change accounts for 1/3 of the entire water area.
The water quality is required to be fresh and pollution-free, with convenient water intake and drainage, sufficient water sources, and compliance with national fishery water standards.
After the medicinal properties of the clear pond disappear, the pond water should be kept at 20-30cm. After the water temperature gradually rises, aquatic plants can be planted. For ponds planted with submerged plants such as Hydrilla verticillata and Vallisneria, due to their late germination, it is necessary to set up a water peanut (Hydrophylla philodendron) strip 1 meter away from the edge of the pond, with a width of 2 meters, as an auxiliary measure to absorb water body fertility, regulate water quality, improve river crab habitat, avoid enemy molting sites, and provide shade and cooling.

　　The main types of fertilization include: fermented and sterilized organic fertilizers and inorganic fertilizers such as superphosphate and dicalcium phosphate. The first is to adjust "new", that is, add new water, once every 5-7 days, and change the water once every 10 days and a half. In high-temperature seasons, add 20-30cm of water every day, and change the water once every 3-5 days.
The water depth is controlled at 0.5-0.6cm from March to May, 1.2-1.5m from June to August (the water level may be deepened appropriately in high temperature seasons), and stabilizes at around 1m from September to November. As the stocking density of crab seedlings in our county continues to increase and the breeding output continues to increase, the ecological environment and water quality regulation of crab ponds have been paid more and more attention by the majority of farmers. Practice has proved that in the crab breeding process, the full use of microecological preparations has obvious effects on improving the ecological environment of crab ponds, regulating water quality, improving crab immunity, preventing diseases, and promoting growth. When purchasing, farmers must carefully read the main strains contained on the label, the main mechanism of action after being put into water or mixed with erbium and fed, and use them in a targeted manner.
1. Under natural breeding conditions, there are many factors that will affect the effectiveness of microecological preparations, such as weather, water temperature, water quality, water body fertility, and the type of breeding. The effects vary greatly.
Water peanuts can also induce some live bait to be eaten by river crabs, such as water worms and small fish, shrimps, snails and aquatic insects among annelids.

Second, a "cluster" of vines must be formed in the pond. It should not be a few water pods together, but clusters together, otherwise the above effect will not be achieved.
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Pay attention to frequent water changes to keep the water level stable. Change the water once a week in spring and every 3 days in summer. If the high temperature persists, change the water every day. In autumn, the weather is hot and muggy weather often occurs, and the water quality is easy to deteriorate. Pay special attention to water changes. Change the water once every 2 days. The water change accounts for 1/3 of the entire water area.
The water quality is required to be fresh and pollution-free, with convenient water intake and drainage, sufficient water sources, and compliance with national fishery water standards.
After the medicinal properties of the clear pond disappear, the pond water should be kept at 20-30cm. After the water temperature gradually rises, aquatic plants can be planted. For ponds planted with submerged plants such as Hydrilla verticillata and Vallisneria, due to their late germination, it is necessary to set up a water peanut (Hydrophylla philodendron) strip 1 meter away from the edge of the pond, with a width of 2 meters, as an auxiliary measure to absorb water body fertility, regulate water quality, improve river crab habitat, avoid enemy molting sites, and provide shade and cooling.

　　The main types of fertilization include: fermented and sterilized organic fertilizers and inorganic fertilizers such as superphosphate and dicalcium phosphate. The first is to adjust "new", that is, add new water, once every 5-7 days, and change the water once every 10 days and a half. In high-temperature seasons, add 20-30cm of water every day, and change the water once every 3-5 days.
The water depth is controlled at 0.5-0.6cm from March to May, 1.2-1.5m from June to August (the water level may be deepened appropriately in high temperature seasons), and stabilizes at around 1m from September to November. As the stocking density of crab seedlings in our county continues to increase and the breeding output continues to increase, the ecological environment and water quality regulation of crab ponds have been paid more and more attention by the majority of farmers. Practice has proved that in the crab breeding process, the full use of microecological preparations has obvious effects on improving the ecological environment of crab ponds, regulating water quality, improving crab immunity, preventing diseases, and promoting growth. When purchasing, farmers must carefully read the main strains contained on the label, the main mechanism of action after being put into water or mixed with erbium and fed, and use them in a targeted manner.
1. Under natural breeding conditions, there are many factors that will affect the effectiveness of microecological preparations, such as weather, water temperature, water quality, water body fertility, and the type of breeding. The effects vary greatly.
Water peanuts can also induce some live bait to be eaten by river crabs, such as water worms and small fish, shrimps, snails and aquatic insects among annelids.

Second, a "cluster" of vines must be formed in the pond. It should not be a few water pods together, but clusters together, otherwise the above effect will not be achieved.
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Breeding technology

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River crab breeding technology

2014-03-03 admin 8332

River crab breeding technology 1.2

2—3

1 0.6—1.5 2 " 3

4

5

Density: At present, polyculture is the main method, especially fish, shrimp and crab polyculture, the economic benefits will be higher.The density can be controlled at1500 6

New technology for healthy crab breeding 1. Create excellent ecological conditions based on the biological characteristics of river crabs

Aquatic plants are not only a place for river crabs to inhabit and avoid enemies to shed their shells, but they can also purify water quality and increase dissolved oxygen in the water through photosynthesis. At the same time, they are also good bait for river crabs. They can also prevent heatstroke and cool down in summer and promote the growth of river crabs. The main varieties are Hydrilla verticillata,Elodea10-15kg, the spacing between rows is 1-1.5m, and it is planted in the front pond; Vallisneria, also known as noodle grass and non-leek grass, is a typical submerged plant with small seeds and a length of 1 meters away from the edge of the pond, with a width of 2 meters, as an auxiliary measure to absorb water body fertility, regulate water quality, improve river crab habitat, avoid enemies and shed their shells, and provide shade and cooling. Large-scale high-quality river crab breeding must have high-quality crab seeds to lay a good seed foundation. High-quality crabs must have high-quality crab seedlings (big-eyed larvae) to improve reliability. We mainly adopt fixed-point nursery and self-bred crab seeds to solve the source problem. In winter, crab species are in an overwintering dormant state, with poor mobility and prone to injury. Stocking crab species in winter affects the survival rate and recapture rate, and stocking small-sized crab species affects year-end product specifications. Compared with self-bred crab species, several years of practice have proven that the survival rate, disease resistance and growth specifications of self-bred crab species are significantly better than those of crab species purchased from other places; the "three adaptations" refer to appropriate stocking specifications, appropriate stocking time and appropriate stocking density.
The feed arrangement of the entire breeding process has different priorities: in the early stage, it is the early stage of stocking crab species. After a long winter, the crab species consume a lot, and nutrition must be strengthened to ensure the smooth molting of the first time, which is conducive to improving the survival rate. The feeding species used mainly include small miscellaneous fish, clam meat, snail meat and river crab full-price pellet feed; the middle period is the high temperature season, and no animal feed is added to avoid being detrimental to the digestion and absorption of river crabs and causing diseases. Water grass is used ​​The first is to adjust the "new", that is, add new water, water should be added once every 5-7 days, change the water once every 10 days and a half months, in high temperature season, add water 20-30cm every day, and change the water once every 3-5 days. The second is to adjust the "optimal" value, that is, adjust the PH value to control the PH value between 7.5-8.5. Use quicklime once every 10 days, and the dosage is per mu per meter of water depth5mg/L, the transparency 40cm, the PH value 7.5 and the ammonia nitrogen The water depth is controlled at 0.5-0.6cm in the months of March-5, and the water depth is controlled at 1.2-1.5m in the months of 6-8 (the water level may be deepened appropriately in high temperature seasons), 　

As the stocking density of crab seedlings in our county continues to increase and the breeding output continues to increase, the ecological environment and water quality regulation of crab ponds have been paid more and more attention by the majority of farmers. Practice has proved that in the crab breeding process, the full use of microecological preparations has obvious effects on improving the ecological environment of crab ponds, regulating water quality, improving crab immunity, preventing diseases, and promoting growth. 1. Types of microecological preparations

Currently, there are dozens or even hundreds of microecological preparations sold on the market with various trade names and varieties. The main reason is that the amount of crabs and other farmed animals in the pond in summer increases animal excrement, remaining erbium materials and the death of aquatic plants, which brings hidden dangers to the ecological environment balance of the water body. By using microecological preparations, we can effectively decompose toxic and harmful substances in the water, maintain the balance of the ecological environment of the water body, and ensure that our farmed animals have less or no disease. During the crab breeding process, microecological preparations are used from April to September. Pay attention to the following points when using them. 3. Defects of microbial preparations

3. Microbial preparations should be stored in dark, low-temperature conditions, usually

Mainly filamentous algae in algae(

76-

Fifth, water peanuts should be cultivated in pieces in the pond, and each piece should not exceed 2