Key points for the cultivation of young crabs

First, create a good ecological environment. First of all, the cultivation pond area is about 5-10 mu, which is not only conducive to uniform feeding and water quality control and other management, but also convenient for one-off pond fishing and sales; second, do a good job in pond cleaning and escape prevention, so as to prevent snakes, frogs, wild miscellaneous fish and other enemies from entering the pond; third, keep the cultivation pond moderately fertile and watery. Biological agents can be used to fertilize and water, which can not only provide rich natural bait for bigeye larvae, but also effectively prevent the proliferation of moss, maintain the stability of water quality in the middle and later stage; fourth, maintain the appropriate density of aquatic plants. It is appropriate to select water peanut for the breeding of young crabs, and the best distribution density of water peanuts in each stage of the culture pond should be maintained according to different seasons and different development stages of young crabs; fifth, timely adjust the water level to maintain good water quality and promote the molting of young crabs.

Second, high-quality big-eyed larvae go down to the pond at the right time. Timely going down the pond means that the quality of big-eyed larvae accords with the cultivation of fresh water, and the physical, chemical and biological indexes of the water body of the culture pond meet the best requirements of juvenile crab cultivation. First of all, the quality of bigeye larvae is good; secondly, the water quality of the culture pond is suitable and rich in natural live bait that bigeye larvae like to eat; third, maintain sunny weather in the next 3 days; fourth, when bigeye larvae go into the pond, the water body is moist first, and the temperature difference is controlled within 3 ℃.

Third, feed high quality compound feed scientifically. First of all, do not feed surimi, egg yolk, soybean milk, fish milk and other feed materials with very low utilization and poor palatability. These raw materials are not only uneven in size, resulting in uneven feeding, which is not conducive to the synchronous metamorphosis of bigeye larvae and the balanced development of young crabs, but also these feeds are easy to rot, easily lead to the deterioration of water quality, and not conducive to disease prevention. In production, big-eyed larvae should be fertilised and fed mainly by natural bait; secondly, heavy and non-important areas should be determined according to the distribution of young crabs in the pond, and the amount of feeding should be increased in the key areas, which can effectively reduce the degree of uneven feeding of young crabs. and follow the principle of "multiple throwing", can reduce the size difference of young crabs. Third, it should be fed normally after September, and if there are still many young crabs with small individuals, they should take measures based on high-quality small pellet feed in time to promote the full intake of young crabs. this is of great significance for controlling the disease of young crabs in the following spring and promoting early molting.

Fourth, strengthen disease prevention and control. The common diseases in the breeding process of young crabs are landing disease, rotten limb rotten shell disease, ciliosis and enemies such as rats, snakes, frogs, fish and so on. The big-eyed larvae were fertilized and watered by biological fertilizer and water before going into the pond, and the microecological agents were used to regulate the water quality in the whole pond. The young crabs were killed once with the shell in time, and then disinfected in the whole pond, which had a significant effect on the landing of the young crabs. Regular addition of microecological agents to the feed is beneficial to promote the growth and disease resistance of young crabs, and microorganisms are used to improve the water regularly. Prevent the occurrence of sudden changes in water quality such as the deterioration of water quality and the death of algae, earnestly do a good job in the maintenance of water quality, and pay attention to preventing hypoxia. Do a good job of regular disinfection of pool water and take timely measures to deal with the disease.