Swimming crab high-efficiency breeding technology

First, pond conditions. The crab pond culture pond should be made of sand and mud bottom, and the pond area should be 10-25 mu. The water depth should be 1.5-2.0 meters. Divide 4 meters wide and 0.5 meters deep around the pond and raise the pool 1.2 meters. Only one set of drainage culverts is set in Tongkou, and each of the two rows of pond openings is built into one drainage channel. The best choice for ponds is the position where the tidal range is large, the flow is smooth, the salinity is relatively stable, and the pond is convenient for drainage and drainage. Ideally, it is located in the intertidal zone and uses tidal differentials to absorb water. Where there is no such condition, the pump is used to pump water.

Second, the stocking mode

1. Preparation before stocking: After the autumn crabs are harvested, seal the sluice and dry them. After drying, the bottom of the pool will be grooved and ridged. In the middle and late March of the year, water was used to fill the water with a net of 60 mesh and 10 centimeters in length. Each kilogram of lime used 75 kilograms of lime. After Qingchi, the calcium content in the soil and water in crab ponds will increase, which will benefit the growth and development of the crab. After applying 50 cm of water, apply 20-25 mg/L of tea seed cake to remove harmful fish.

2. Number of stocking: According to the changing conditions of ponds, water quality, water depth, feed supply status and technical level, 800-1000 juvenile crabs will be stocked in phase II per acre, 5000 juveniles of shrimps in China, and 50 kg of mussels in shellfish. It is best to separate the ponds with 20-30 mesh nets in the middle of the pond for sex-segregation.

Third, daily management

1. Feed feeding: The feeding amount is closely related to the breeding density, the size of the crab, and the temperature. Under normal circumstances, the amount of daily feeding is 5-10% of crab weight, and 2 shots per day. The amount of feeding must be set at four, namely: timing, quantitative, fixed-point, and qualitative. At regular intervals, 30% of the daily amount of bait is bred in the morning and 70% of the amount of bait is quantified; that is, the quantity and weight of the shuttle crab are regularly determined to determine a reasonable amount of feeding; the fixed point is to feed at a fixed location, and the bait is generally sprinkled on the bait. The fixed slope around the pond; the quality is to ensure the fresh food and ensure the quality. Note that the amount of feeding is generally measured in terms of food intake after 3 hours of feeding and adjusted in time. When the weather is boring or heavy rain, the food should be less or no investment.

2, water quality, water temperature control: strengthen water quality management, adhere to change the water. To master the relationship between water color, transparency, and water exchange. Before July, the transparency could be controlled at about 30 centimeters, and the amount of water changed every day was 10-20%. After July, the transparency of the pool water could be controlled at about 40 centimeters, and the amount of water exchanged every day would be 20-30%. Water temperature is required to be 17-30°C throughout the culture process.

IV. Key points and precautions for aquaculture management

1, daily observation: to strengthen daily observation. A biological observation was conducted every 15 days to measure the shell length, shell width and body weight, and the growth was checked to measure the culture effect. For water temperature, salinity, pH value, dissolved oxygen and other items, hydration indicators are also regularly measured and well documented.

2. Disease prevention and control: Adhere to the principle of “prevention first, prevention and control, and comprehensive management”, maintain good water quality, feed high-quality food, and regularly mix vitamins during high temperatures.

3. Male and female crabs are divided into open and raised: they are good for the growth of female crabs, and they are also protected from the casualties caused by the male crabs in the oyster shell, which helps to improve the survival rate and increase the bait coefficient. After mid-December, male crabs can be caught and listed.

4, regular patrol pond: do a good job of anti-theft anti-theft work.

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