Autumn is the fastest growing season for crabs. Grasping management at this stage of crab rearing promotes rapid growth of crabs and can achieve better economic benefits.
First, investing in bait and bait requires a combination of fine and coarse foodstuffs, a reasonable mix of animal and vegetable diets, and animal feed. Available animal feeds include small trash fish, snail meat, animal viscera, cocoon, fish meal, etc., which account for more than 70% of the total feeding amount. Available plant foods include: bean cake, wheat, claw Fruit, corn and so on. Can also feed protein content of more than 40% of the crab full price pellet feed. All kinds of animal and vegetable foods should be cut into pieces or pieces, placed in shallow water areas with aquatic plants, and the distribution should be uniform. The daily feeding amount accounts for 5%-8% of the amount of pool crabs and is fed twice a day. The amount of feeding in the evening accounted for 70% of the total amount of feed. Remove the bait in time to avoid damaging the water quality.
Second, adjust the water quality in the late aquaculture requires deep pool water more than 1.5 meters, more than 30 cm in transparency, change the water every 7 days -10 days, and maintain a stable water level to prevent crab escape and crab formation. Every 15 days, 15 kg per gram of lime is used to mash the whole pool, increasing the water body's calcium content, and meeting the calcium requirements when the crabs transform from yellow shell crab to green shell crab. There must be enough aquatic plants in the crab pool, and the coverage rate is stable at about 50%.
Third, pay attention to the main diseases of the disease prevention crab in the fall are ciliate disease, black shank disease, shelling and other diseases. Usually every 7 days -10 days Quanchiposa 0.5 mg / l strong chlorine fine, regular addition of oxytetracycline, dehulling, etc. in the crab diet to prevent crab disease. When ciliate disease is found, 0.75 kg of carapace nets can be spilled per acre. Found dead crabs, immediately find the cause, the right medicine, and deep-buried crabs to prevent the spread of the disease. Water rat, frog, water snake and other predators in the crab pond should be removed immediately.
Fourth, timely arrests When the water temperature dropped to below 10 °C, it should be timely arrest to prevent crabs drilling or drilling mud winter. Means such as cages and water trapping can be used. After most of the crabs are caught, they are drained and the crabs are caught in the net.
Fifth, pay attention to the dissolved oxygen in the pond autumn and autumn, the water temperature is gradually low, dissolved oxygen in the water will also have a corresponding change. Relative to summer, dissolved oxygen will be lower, so the dissolved oxygen content in the pond is another important aspect of autumn culture. Fish music automatic oxygen control system is to establish a sensor-based detection method, Internet of things for communication, embedded CPU logic judgment, PLC circuit as a means of regulation, based on the Internet of things pond high-yield culture water quality intelligent control system. The system consists of water quality monitoring, wireless data transmission, and control equipment. It forms a complete system with monitoring, transmission, and control as a closed loop, and achieves the purpose of automatic, remote control, and other intelligent means for monitoring and increasing oxygen.
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