Scientific cultivation of grass carp fingerlings
In the fish-breeding model in which grass carp is the main breeding species, 6,000 species of summer fish are commonly planted per mu, of which grass carp accounts for 60%. With grass carp, silver carp, carp, etc., the designed grass carp species output is generally around 300kg. Appropriately, (the specific density should be determined according to the bred standard, but the yield of grass carp should be within this range.) Excessive design, such as poor management at the later stage, can result in a large number of deaths of fish species. Too low will make the specification larger, and the yield will not affect the economy. benefit. When summer flowers are released, care should be taken to apply quicklime to disinfect ponds before entering the pool; summer flowers should be soaked with 20ppm potassium permanganate for 20 minutes before entering the pool; the main fish should be advanced to the pond and fish rearing should be postponed. The temperature difference during stocking should be lower than 4°C to reduce the stress response when the summer flower enters the pool.
Second, daily management
Cultivation of grass carp fingerlings should pay attention to day-to-day management and take a good "three levels."
1, water quality regulation
We must keep the "fat, live, tender and cool" of the pool water. Generally, 20ppm of quicklime is sprayed on the entire pool every 15-20 days to regulate the water quality; during the middle and late culture period (after mid-August), microbial preparations are periodically used to degrade ammonia-nitrogen and nitrite in the water (with dislocation of the disinfectant using time); The new water regulates the biological composition in the supplementary water body and promotes the circulation of the water body material.
2, feeding feed off
After 6cm of grass carp, their food habits changed, mainly herbivorous, and certain conditions should be fed with certain duckweed. Before formal feeding, train the fish species to catch food on the surface of the water. Select the branded feed produced by a professional manufacturer of fish feed, and follow the methods of “fixed, regular, quantitative, and qualitative†to feed a small amount of meals. In the early stage, the feed protein is high, and the late protein can be about 22%. Generally, the feeding amount in the early June-July, mid-October and November months should be relatively increased, and the feeding amount should be controlled in the middle period so as to ensure the preparatory maintenance and improve The survival rate will be promoted in the later period, so that “grasping the two ends and protecting the middle†will be avoided. Blindly pursuing the previous specifications will lead to the later onset.
3, prevent disease
The disease incidence is high during the cultivation of grass carp fingerlings, and disease prevention is the key. In addition to regular use of disinfectants, internal medicines need to be added during the peak of onset. Medication should pay attention to avoid frequent use of drugs, avoid not symptomatic remedy. Grass carp fingerlings are prone to outbreaks, hemorrhage, and hepatobiliary syndrome in the later period. They must be carefully diagnosed and the disease should be prescribed. These three diseases are easy to be complicated and difficult to cure once they occur. According to the rule of incidence, add internal medicine during the onset season to prevent it. For rotten deer, enrofloxacin fish, Corning, and water body disinfection should be administered internally, and mild quaternary ammonium iodine is generally recommended. Do not use strong irritating disinfectants. Insect pests should be killed first, insecticides must not be used without insects, resulting in deterioration of water quality, destruction of phytoplankton in water, and the formation of a vicious circle of water. Hemorrhagic disease should be better with orally taken orally. Hepatobiliary syndrome should increase hepatoprotective drugs, supplemented with stress Ning and Vc, VE to enhance the body's anti-stress ability, and improve the ability to resist disease.
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