After October of each year, it is the peak season for crabs to be caught. However, at this time, the price of crabs is often low. Therefore, in order to increase the benefits of seasonal differences, many farmers will raise the crabs for harvest after they are harvested, in case prices rise. The relevant maintenance techniques are described below:
First, raise the pool of crabs, raise the pool, the general choice of water pollution-free, adequate water, drainage and irrigation facilities, convenient transportation of the pond. Tian Yan should be solid and strong, water retention is strong, the normal water storage around lm, the bottom of the pool sludge depth does not exceed 15cm. One week before the river crab enters the pool, add the pool water to 50cm and collect aquatic plants such as water peanuts and water hyacinth.
Second, the maintenance must be selected to maintain the disease-free health, physical fitness, the individual larger crabs, depending on the maintenance of feeding time and water temperature, generally about 750kg crabs into the Mu. Before stocking, soak in 5-10 minutes with 3-10ppm potassium permanganate solution.
Third, feeding and management
1 After feeding the pool of crabs and crabs, the density increases and the amount of activity increases. Feeding should be strengthened to increase fertility. The bait includes vegetal foods and animal feeds. Common plant foods are wheat, soybeans, pumpkins, potatoes, bean cakes; common animal foods are small trash fish, snails, livestock waste and so on. The pre-feeding amount accounts for about 5%-8% of the pond crab weight, and the amount of animal protein should be appropriately increased in the later period depending on the weather conditions. Feeding should not only be based on the edge of the pool, but also be fed in the middle of the pond so that the river crab can eat it.
2, water quality regulation River crab likes the relatively fresh water quality environment, therefore, if discovers the pool to become the water due to the overfeeding to become the fat, the blackness or the obvious turbidity must add the new water promptly. Changing the water should be carried out in a sunny day. The first 1/3 of the pool water should be drained, and then the fresh river water should be added to keep the water level at 0.8-1.Om. Days of nausea and haze days must promptly open aerators or pumps to flush oxygen.
3. Crabs that escaped from breeding are often prone to escape due to increased density and environmental changes, especially during the days before and during feeding. Therefore, the crabs should be carefully inspected after entering the water outlets and fence facilities. If leaks are found, they must be carefully repaired; the ponds around the pond must be carefully inspected on a windy and rainy day to prevent damage to the escape crabs and economic losses.
Fourth, over the winter before the advent of freezing cold will be filled with pool water, such as the surface of the pond ice, ice drilling in time to make holes in order to increase the pool oxygen, prevention and control of pond crab died of hypoxia suffocation.
Fifth, arrests will be made at the time when the price is appropriate. The catch can be caught by tools such as cages and nets, or it can be trapped by light or caught artificially at night. If it is necessary to wait for a period of time after catching it, it must be kept for a while.
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