How to cultivate grass carp fingerling scientifically to reduce cost and increase benefit

Although the breeding mode of grass carp fingerling is common, there are still some problems. In practice, prevention is more important than control. In the process of grass carp fingerling cultivation, we should pay attention to daily management and do a good job of "three passes".

Grass carp fingerling

1. Water quality regulation. The pool water should be "fat, alive, tender and cool". Sprinkle the whole pond with 20ppm quicklime every 15-20 days to regulate the water quality; regularly apply microbial preparations that can degrade ammonia nitrogen and nitrite in water (staggered with disinfectant) in the middle and later stages of culture (after mid-August); regularly add new water to regulate the biological composition of supplementary water to promote water material circulation.

2. Feed off. Grass carp species after 6cm, feeding habits change, mainly herbivorous, conditional, should be fed duckweed. Before formal feeding, grass carp were trained to feed on the water surface, regular fish feed was selected, fixed point, timing, quantity, quality and feeding were carried out. A small amount of multiple meals, the early feed protein is high, the later protein is about 22%. Generally speaking, the feeding amount from June to early July and from mid-October to November should be larger, and the medium-term feeding amount should be controlled, keeping fat in the early stage, improving the survival rate, promoting growth in the later stage, and achieving "grasping both ends and protecting the middle". Do not blindly pursue the early specifications and lead to the late onset of grass carp.

3. Prevention of disease. During the period of grass carp fingerling cultivation, the incidence rate is high, and disease prevention is the key. In addition to the regular use of disinfectants, it is also necessary to add medicine to grass carp during the high incidence period of the disease. Avoid frequent use of medicine, do not prescribe the right medicine. Late grass carp fingerling, prone to the outbreak of rotten Gill, bleeding, hepatobiliary syndrome, must be diagnosed carefully and prescribe the right medicine. These three diseases are easy to complicate, but once they occur, they are difficult to cure. According to the law of the disease, in the onset season, add internal medicine to grass carp to prevent. For rotten gills, enroxacin fish and Kangning should be taken internally, supplemented by mild quaternary ammonium salt iodine water disinfection, and strong irritating disinfection fungicides should be avoided. If there are insects, they should be killed first, and insecticides should not be used frequently without insects, resulting in the deterioration of water quality. Grass carp hemorrhagic disease, internal administration of poison sensitive. Hepatobiliary syndrome should be treated with hepatoprotective drugs, supplemented with Yingjining, Vc and VE to enhance the anti-stress ability and disease resistance of grass carp. Grass carp fingerling culture should follow the basic ecological characteristics of this fish, re-management, the increase and decrease of feeding amount should be scientific and reasonable, and high yield will be achieved.