Crabs need to be strengthened in August
2018-05-03 17:00:12
Crab farming entered August, and it can be said that the most critical period is that in the middle and late August, the crabs will undergo the last oyster shell - the genital oyster shell, from the yellow crab into the green crab, into the mature growth period, this stage is also In recent years, during the outbreak of diseases in crab breeding, the three solar terms of the summer heat, the autumn, and the summer heat have been passed in August. During the process of the exchange of these three times, the weather changes more frequently, with hot, hot and hot weather, and there are also cool ones. In cold weather, the sudden change of nature's climate will inevitably cause great changes in the farming environment, and even produce bad effects. For example, the water temperature is too high, the temperature difference is disparity, and the low dissolved oxygen will affect the growth of crabs and the growth of aquatic animals and plants. All will have adverse effects, and even destroy the ecological balance of the water environment, causing the disease to cause the death of crabs. Therefore, during this period, we must take appropriate management measures to ensure the smooth progress of the final stage of crab breeding.
1. Feeding of bait: In August, before the last shelling of the crabs, it is expected that the amount of ponds and other ponds in the pond will be about 70 pounds/mu. This period is at a high temperature. When the water temperature exceeds 30°C, the appetite of the crabs will be reduced. The daily food intake should be controlled at 7-8% of the pond volume. At the same time, if the body fat accumulation in the crab is too high, it is not conducive to the oyster shell of crabs. The ratio of feeding of animal and plant foods should be properly adjusted, and the proportion of plant foods should be adjusted. The corresponding increase in the previous period, fish and other animal food generally require control of 3-4 pounds per acre. After the crab shells, it is estimated that the amount of ponds and other ponds will be more than 100 pounds/mu. At this stage, with the approach of the market and the mature growth requirements of river crabs, crabs need to gradually accumulate nutrients such as protein, fat, and amino acids. The food intake should be increased, and the proportion of animal feed should be increased. Animal fish such as small fish should reach 6 kg/mu or more.
Second, water quality regulation: August is the season exchange stage, from summer to autumn. In order to properly reduce the temperature of the water body, the highest water level in the pond should be maintained. The water grass coverage rate in the crab pond should reach more than 60%. The pond should add water once every two days to supplement the loss of water in the pond. Add water to choose between early morning or early morning. Do not add water in the evening. Splash lime to adjust the water quality should be cautious, the best choice is to be carried out after fine rain, quicklime dosage controlled at the depth of 5 to 10 pounds per metre per mu. In places where the quality of the source water is not good, dilute ecological preparations should be used to adjust the water quality in the pond. The appropriate type of microecological preparations can be selected according to the monitored water quality indicators and used once every 7-10 days.
III. Disease Prevention and Control: August is the peak period of river crab disease, and the causes are more complicated. A large part of it has a direct relationship with abrupt changes and deterioration of the crab's living environment. Excessive water temperature, excessive temperature difference, etc. have a great impact on the breeding environment. Large changes, which will seriously affect the growth of crabs and can easily lead to outbreaks of river crab disease. The pupa shell of my river crab was generally affected by the high temperature season in the middle and late August. At this time, the crab body had poor resistance. In this process of pupa, a large number of deaths occurred easily. Therefore, we should take appropriate measures to prevent it. First, scientific and reasonable feeding and water quality management are based on the nutritional requirements and water quality requirements of crab growth. The second is to improve the water environment. In August, the aquaculture water environment is prone to major changes. It is necessary to try to maintain the ecological balance of the water in a relatively stable state and take appropriate measures to remove the baits, floating and sinking plants, and ponds in time. Insufficient supply of aquatic weeds should be added in time. In the case of serious weeds in the pond, we must increase the feeding of vegetable feeds and feed on the larvae. Too much water in the crab pond can open a few grass ditch in the pond, which is conducive to the flow of water. At the same time, it can also be used to stocking grasshoppers and summer fish. Regular use of sediment improver improves the quality of pond sediments, and regularly uses microecological preparations to increase beneficial bacteria in the water and reduce pathogens in the water. This allows the water to be in a virtuous circle and achieve disease prevention. The third is to periodically add vitamins and minerals and other necessary trace elements in the bait to regulate the physiological function of the crabs, enhance the body of the crabs, and splash crabs in the vicinity of the shells with multi-dimensional, hard shell treasures and other calcium, vitamins, Amino acid nutrients are conducive to normal crab shell growth. Fourth, ponds with large casualties should analyze the causes of the diseases. They should not blindly use drugs and drugs of abuse. During the hot season, disinfection, sterilization, and insecticides should be used with caution. Since this stage is affected by high temperatures, the stress response ability of crabs is poor. Improper use may result in greater harm. In the prevention and control of diseases, the medicine can be mixed in the bait regularly to improve the water environment, improve the disease resistance of the crab, maintain a stable and good ecological environment, and reduce the occurrence of diseases.
1. Feeding of bait: In August, before the last shelling of the crabs, it is expected that the amount of ponds and other ponds in the pond will be about 70 pounds/mu. This period is at a high temperature. When the water temperature exceeds 30°C, the appetite of the crabs will be reduced. The daily food intake should be controlled at 7-8% of the pond volume. At the same time, if the body fat accumulation in the crab is too high, it is not conducive to the oyster shell of crabs. The ratio of feeding of animal and plant foods should be properly adjusted, and the proportion of plant foods should be adjusted. The corresponding increase in the previous period, fish and other animal food generally require control of 3-4 pounds per acre. After the crab shells, it is estimated that the amount of ponds and other ponds will be more than 100 pounds/mu. At this stage, with the approach of the market and the mature growth requirements of river crabs, crabs need to gradually accumulate nutrients such as protein, fat, and amino acids. The food intake should be increased, and the proportion of animal feed should be increased. Animal fish such as small fish should reach 6 kg/mu or more.
Second, water quality regulation: August is the season exchange stage, from summer to autumn. In order to properly reduce the temperature of the water body, the highest water level in the pond should be maintained. The water grass coverage rate in the crab pond should reach more than 60%. The pond should add water once every two days to supplement the loss of water in the pond. Add water to choose between early morning or early morning. Do not add water in the evening. Splash lime to adjust the water quality should be cautious, the best choice is to be carried out after fine rain, quicklime dosage controlled at the depth of 5 to 10 pounds per metre per mu. In places where the quality of the source water is not good, dilute ecological preparations should be used to adjust the water quality in the pond. The appropriate type of microecological preparations can be selected according to the monitored water quality indicators and used once every 7-10 days.
III. Disease Prevention and Control: August is the peak period of river crab disease, and the causes are more complicated. A large part of it has a direct relationship with abrupt changes and deterioration of the crab's living environment. Excessive water temperature, excessive temperature difference, etc. have a great impact on the breeding environment. Large changes, which will seriously affect the growth of crabs and can easily lead to outbreaks of river crab disease. The pupa shell of my river crab was generally affected by the high temperature season in the middle and late August. At this time, the crab body had poor resistance. In this process of pupa, a large number of deaths occurred easily. Therefore, we should take appropriate measures to prevent it. First, scientific and reasonable feeding and water quality management are based on the nutritional requirements and water quality requirements of crab growth. The second is to improve the water environment. In August, the aquaculture water environment is prone to major changes. It is necessary to try to maintain the ecological balance of the water in a relatively stable state and take appropriate measures to remove the baits, floating and sinking plants, and ponds in time. Insufficient supply of aquatic weeds should be added in time. In the case of serious weeds in the pond, we must increase the feeding of vegetable feeds and feed on the larvae. Too much water in the crab pond can open a few grass ditch in the pond, which is conducive to the flow of water. At the same time, it can also be used to stocking grasshoppers and summer fish. Regular use of sediment improver improves the quality of pond sediments, and regularly uses microecological preparations to increase beneficial bacteria in the water and reduce pathogens in the water. This allows the water to be in a virtuous circle and achieve disease prevention. The third is to periodically add vitamins and minerals and other necessary trace elements in the bait to regulate the physiological function of the crabs, enhance the body of the crabs, and splash crabs in the vicinity of the shells with multi-dimensional, hard shell treasures and other calcium, vitamins, Amino acid nutrients are conducive to normal crab shell growth. Fourth, ponds with large casualties should analyze the causes of the diseases. They should not blindly use drugs and drugs of abuse. During the hot season, disinfection, sterilization, and insecticides should be used with caution. Since this stage is affected by high temperatures, the stress response ability of crabs is poor. Improper use may result in greater harm. In the prevention and control of diseases, the medicine can be mixed in the bait regularly to improve the water environment, improve the disease resistance of the crab, maintain a stable and good ecological environment, and reduce the occurrence of diseases.