Crabs need to be strengthened in August

Into the August, the crab breeding can be said to be truly the most critical period. In the middle and late August, the crabs will undergo the last time the oyster shell - genital oyster shell, from the yellow crab into green crab, into the mature growth period, this stage is also in recent years During the period of disease outbreak in crab breeding, the three solar terms of summer heat, autumn, and summer are required in August. In the process of these three climate changes, the weather changes more frequently, with hot, hot and hot weather, and cool low temperatures. In the weather, the abrupt changes in the natural climate will inevitably lead to large changes in the farming environment and even adverse effects. For example, if the water temperature is too high and the temperature difference is disproportionate, the low dissolved oxygen will affect the growth and aquatic growth of the crabs and the growth of the plants. It will have an adverse effect, and it will even destroy the ecological balance of the water environment and cause 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 crabs, it is expected that the amount of ponds and other ponds in ponds will be about 70 pounds per mu. This period is at a high temperature. When the water temperature exceeds 30°C, crab appetite diminishes. 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 the crab. The ratio of feeding of animal and plant foods should be properly adjusted, and the proportion of plant food 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 pools will be more than 100 pounds/mu. At this stage, with the approach of the market and the mature growth requirements of crabs, the 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 foods 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 should be maintained in the pond. 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 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 is generally affected by the high temperature season in the middle and late August. At this time, the crab body has poor resistance. In this process of pupa, a large number of deaths are likely to occur. 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 properly raise the grass carp and the summer carp. Regular use of sediment improver improves the quality of pond sediments and regularly uses microecological preparations to increase the beneficial bacteria in the water and reduce the 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 medicines can be mixed regularly in the bait to improve the water environment, improve the disease resistance of crabs, maintain a stable and good ecological environment, and reduce the occurrence of diseases.

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