The newly excavated ponds have no silt at the bottom, and the water quality is slim, the water body is muddy, the floating flora and fauna are less, the oxygen production capacity is poor, and oxygen deficiency is easy. Some waters contain more heavy metal salts or toxic substances, which are very irritant to fish and prone to fish diseases, affecting economic efficiency. Therefore, in order to obtain high yields of fish reared in newly-fished ponds, in addition to routine management, the following technical measures should also be focused on:
1. Thoroughly clear the pond and disinfect and level the pond slopes and dam feet to prevent water leakage. Generally, the ponds must be soaked in fresh water before they are stocked. The freshly dug ponds that are to be prepared for fish should be filled with fresh water, drained after soaking for several days, and then soaked again several days later. This removes heavy metal salts and toxic substances that can harm fish. Thoroughly disinfected with quicklime 7 to 10 days prior to stocking fish stocks to improve pond bottoms. The average dry mud is 75 grams per gram of lime slurry in the whole pool, or with water at a depth of 1 meter per acre. The whole pool is splashed with quicklime 150 kg of water to kill pathogens.
2. Ensure that sufficient amount of basal fertilizer should be applied to the base fertilizer at the same time when the irrigated pond is irrigated for the third time to increase the pond water fertility, promote the reproduction and growth of plankton, and provide enough natural food for the fish. Basal fertilizer should be dominated by pigs, cattle and other livestock manure, generally 7 to 15 days before the fish under the pond, Mushi 500 to 600 kg. The specific amount of fertilization should also be considered as the bottom of fish ponds, and 30 to 40 kg of chemical fertilizers can also be used to cultivate a large number of plankton for fish to feed.
3. Reasonable selection of fish seedlings before the lower pond, the required depth of 1.5 to 2 meters, the color is gray and white, the general transparency is maintained at about 30 centimeters; water quality is moderate, can not be too fat, otherwise it will cause the floating head of fry death. The release of fingerlings should be based on herbivorous fish, supplemented by fertilized water and omnivorous fish, and the stocking amount should be based on water conditions, oxygen-enhancing equipment, fish size and breeding techniques. In general, 800-1000 fish species are magnified by 1 mu of pond size, and the annual output can reach 400-500 kg. With the proportion: 60% of grass carp and head lice, 30% squid, squid and other fish 10%, fish species generally should be stocked in the winter. Fry seedlings require a size of 16.5 cm or more, and deeper waters should reach 20 cm or more in order to increase the fish growth rate and growth rate.
4. Frequent splashing of lime. Freshly dredged fish ponds are generally muddy, affecting the respiration of fish and the reproduction of plankton. Splash lime once every 10 to 15 days, with a good muddy water effect, but also play a role in the prevention of fish diseases. The amount is 20-30 kg of water per acre of pond, sprinkle the whole pool.
5. Fertilizer applied for scientific fertilization and feeding is mainly human urine and fertilizer. Topdressing should adhere to less applied, ground facilities, generally 150 to 250 kg of manure per mu. For ponds that use mainly grass carp or herring, or ponds where carp is mixed with green grass and grass carp, baits are given in addition to fertilization. Commonly used baits include aquatic grasses, dry grasses, bean cakes, and oysters, and are preferably processed into compound feeds. And according to water quality, weather, water temperature and other flexible increase and decrease to keep the pool water was dark brown, grass green, brown and yellow is appropriate.
6. Effective prevention and treatment of fish diseases Frequent disinfection and decontamination of fish bodies, bait stations (fields), and tools are performed to eliminate pathogens and improve the disease resistance of fish bodies. Once fish disease is found, measures should be taken to treat the disease in time, and usually some fish blood, four yellow powder, fish insects, etc. can be fed, which can prevent and treat fish diseases such as enteritis, gills and parasites.
7. To prevent floating ponds in floating ponds, new fish ponds will require more time for the improvement of the dissolved oxygen and other ecological environment. It is necessary to strengthen early and evening inspections and frequently inject new water. Ponds need to be free of weeds, slag-free crumbs, and no residual baits. The water environment is poor in the early stage of cultivation, and the amount of fish contained in the later period is large. In the case of rainy weather or sweltering weather, easy floating heads or even dead fish in ponds should be completed as soon as possible. Take measures to eliminate it.
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