Summer is the peak season for the growth of crayfish, and it is also a season in which a variety of harmful factors occur. It is of crucial importance to improve the efficiency of crayfish farming. Now we talk about the management skills of crayfish farming in summer:

Reasonable stocking. The growth of crayfish in summer is closely related to the choice of ponds and methods of stocking, so pond selection and reasonable stocking should be noted. First clean up the pond. Shrimp ponds should generally choose adequate and stable water sources, water quality is clean and pollution-free, water injection and drainage are convenient, water-holding performance is good, and transportation is convenient. Water conservancy facilities have good surface area and size, and the position of the pond is convenient for convenient planting and management. Due to the strong climbing ability and digging ability of the crayfish, it is required that the pool clams should be both solid and generous. The reinforcement should be layered and compacted, with a height of more than 1 meter and a width of more than 3 meters at the top. Inlet and outlet ports should be fenced with barbed wire or fences to prevent crayfish from escaping. At the same time, it is necessary to ensure unobstructed access to water. A shade shed can be set up at a distance of 1 meter from the pool, and vines such as melons, beans, gourds and other vines can be planted on the edge of the pool, and the branches and leaves can be used to shade summer crayfish in summer. Two weeks prior to stocking, crayfish were sprinkled with 75kg to 100kg of calcined water per acre on the water surface of shrimps for disinfection. The next day, the pond was shaken with a tool such as a rake to fully mix the lime slurry with the sludge. The fertilized water was applied to the fermented farmyard fertilizer one week before the seedlings were planted, and the amount was 200 kg to 500 kg per mu to cultivate the natural food in the water. At the same time, it is necessary to transplant hygroscopic aquatic plants such as Hydrilla verticillata and Goldfish algae in the pond, or plant water hyacinth. Aquatic planting area should not be too large, generally accounts for about 10% of the area of ​​the pond, and must be scattered distribution, can not be intensive together, impeding the circulation of water within the pool. Second, we should make reasonable stocking. Should pay attention to the choice of shrimp, should choose a healthy, strong activity, disease-free, no injury, the specifications of the shrimp species. Water barriers (preferably 60 mesh to 80 mesh) should be installed before the pond is flooded to prevent entry of water into the water. The depth of the pool water is kept between 50 cm and 80 cm, and the transparency is between 30 cm and 40 cm. Shrimp stocking should be conducted in the morning and evening on a sunny day. Each acre is stocked with 2 to 6 cm of juveniles ranging from 6000 to 8,000 tails or 4000 to 6000 tails of 3 to 5 cm long juveniles. The specifications for shrimps stocked in the same pond need to be neat and consistent. At the same time, about 50 grams of 500 white abalone can be raised in the pond.

Science feeding. Crayfish are omnivorous animals, mainly feeding on organic detritus. They are capable of eating various kinds of cereals, cakes, terrestrial pastures, aquatic plants in water bodies, algae, zooplankton, aquatic insects, small benthic animals and animal carcasses. Feeding, but also eat artificial feed. Within 3 days after the seedlings are laid, minced small fish and minced meat are to be put in. After 3 days, one month later, put the small fish, minced meat or compound feed. When the shrimp grows to 6 cm to 7 cm, All crushed snails, coriander, and appropriate amount of vegetable feed (such as wheat, bran, corn, cake, etc.) or compound feed. The amount of daily feeding is full, eaten, and no residual baits are allowed. According to experts, generally, medium and small lobsters are fed at 15% to 20% of body weight, and adult prawn is fed at 5% to 10% of body weight. Depending on the food condition of the shrimp, it can be adjusted. Feed 2 times a day, once in the morning and in the evening, and feed at 70%-80% of the daily feed at night. The feed should be distributed around the pond and properly dispersed. The lobster should be fed with more feed. Usually in the pond can cast some water plants such as Vallisneria, black leaf algae, golden algae, water hyacinth, etc., during the growing season of crayfish can be properly fed some animal feed such as crushed snails, clams and animal waste.

Adjust water quality. Crayfish have a strong ability to adapt to the water, usually dissolved oxygen in the water to maintain at 3 mg / l or more to meet the needs of its growth, the water temperature to adapt to the range of 0 °C ~ 37 °C, the optimum temperature range of 18 °C ~ 31 °C. After entering the pond, the shrimp should be kept in a tea-brown color with a transparency of 25 cm to 30 cm. Fertilizer is applied once a month and human and animal manure is applied at a time. The dosage is 150 kg to 200 kg per mu. In the hot season, generally change the water once a week to 2 times, each time to replace 20% to 30% of field water. In addition, we must pay attention to the water temperature, etc. When the summer water temperature is too high, we can use a shade shelter and deepen the field water to regulate the water temperature. When the water is low in dissolved oxygen, water quality is aged, or thunderstorms are sweltering in hot weather, even in cloudy weather, reduce the amount of feeding or stop feeding, and observe the observation. If the lobster is found to be unresponsive, swim to shore and float to the head. When climbing on the shore, it shows that the lack of oxygen is serious, and it is necessary to promptly add water or increase aerator oxygen.

Prevent disease. Because crayfish are very sensitive to many pesticides, pest control should be based on ecological control, and prevention should be strengthened. Drugs with high efficacy, low toxicity, and low residue should be used for pesticide application. Do not use highly toxic drugs and try to avoid the use of oxime esters. Pesticides. Disinfect the surface of the shrimp seedlings before the pond to prevent the pathogens from being introduced into the pool. In the summer, the shrimp ponds are regularly disinfected with quicklime, and new water is often added to keep the pool water clean. In the shrimp feed, various vitamins can be added to enhance Its immunity.

Strengthen management. First of all, we must strengthen day and night patrols. In summer, farmed shrimp ponds are hot due to the weather, and with the increase of input products, various disease-causing and injurious factors are continuously increasing and the incidence of diseases is relatively large. Therefore, daily management should be strengthened to prevent problems. Observe the morning and evening patrols on a daily basis to observe whether the growth of shrimps is normal, whether there is sufficient dissolved oxygen in the water, whether there are loopholes in the ponds, whether enemy organisms enter the ponds, whether the barbed wire and fences are blocked, loosened or damaged, and whether the plants are too dense. Block the water body, always pay attention to whether there are predator organisms in the pool, such as water mice, water snakes, water birds, frogs and fish damage, etc., if any should be removed in time, find the problem to take timely measures. Second, timely arrest and listing. In summer, crayfish grow faster and generally can be caught and stayed small for two months. A balanced market can reduce the density of shrimp in the pond, increase the output per unit area, and can be followed by the market to increase aquaculture efficiency. Fishing methods can be used shrimp cages, cage nets and dip nets and other tools, and finally can be taken from the dry field arrests all arrested and listed.

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