How to optimize the fatness of river crab three management measures for river crab fattening

After the crab has been shelled for the last time, it can be caught and listed after 15 or 30 days of cultivation. Here, it is said that the river crab fattening period, the quality of production management of river crab fattening period directly affects the quality and listing specifications of river crab, and affects the benefit of river crab breeding. How to achieve the best fatness of listed river crabs?

River crab culture

1. Reasonable change of water to maintain good water quality

In order to raise river crabs well, we must first ensure that the water quality of the pond is good. If the pond is treated with medicine in spring and summer, there will inevitably be residues. In autumn, it is necessary to change fresh water frequently to prevent the pond water from deteriorating and maintain appropriate transparency. Generally, the transparency of the crab pond is above 35cm. It is best to change the water before the last shelling of the river crab, which can not only improve the water quality, but also make the shelling neat and smooth. After that, change the water every 10 days, each time less than 30% of the total water.

Second, rational feeding to ensure adequate nutrition

During the fattening period, the feed nutrition and quantity of river crabs should be adequate, and it is best to feed river crabs with a protein content of more than 32%. It is also fresh animal bait, and the daily feeding accounts for about 10% of the total crabs. In actual production, the daily feeding amount is basically finished in 2-3 hours after feeding, and the daily feeding amount decreases gradually with the gradual decrease of air temperature and water temperature in the later stage. The feeding time is mainly in the evening and supplemented in the early morning, and the amount of feeding in the evening accounts for 8090% of the daily feeding.

Third, rational application of medicine to ensure physical health

During the fattening period of river crabs, we should make unremitting efforts to prevent diseases and insect pests, especially ciliosis, which should be combined with "external elimination" and "internal administration". The crabs were sprinkled with chlorine dioxide in the whole pond 10 days after the last shelling, and the crabs with disease prevention and control drugs were added to the feed for 5 days and 7 days. For example, the river crab in the hot mouth is very normal from spring and summer, but the whole pond can be sprinkled with microbial preparation to prevent disease and enhance the physique of river crab.