Freshwater whitefish breeding technology

Commercial fish farming of freshwater pelicans generally adopts three cultivation methods: single-culture ponds, polyculture ponds, and nesting in fingerling ponds, of which the management is simple and the economic benefits are significant. By warming, freshwater pelicans can even breed in the cold regions in early March, and can be hatched after mid-March. Sometimes the early fry can only warm up in the indoor pond. Usually the end of May to early June when the outdoor water temperature meets the requirements of stocking. After disinfection and fish disinfection, clear ponds can be stocked. Each 10,000 square meters of water can be placed at the same time as a total of 1/5 of the total weight of fish to adjust the water quality, and in the fish pond equipped with aerator, according to the climate, dissolved oxygen and other timely oxygen or water injection. According to different growth periods and different water temperatures, the feeding amount is generally 4% to 6% of fish weight. The decline in water temperature at the end of the year should be promptly launched. The early summer flowers in the year can be used as commercial fish, and in Jiangsu and Zhejiang provinces, they are generally caught or put into warm water after the end of October.
The overwintering species have large specifications, high survival rate and rapid growth, but due to the high wintering conservation costs, the number of species conserved is also limited by conditions. Water temperatures in the Jiangsu and Zhejiang regions generally began to stabilize after mid-May. When they reach 20°C or above, they can be stocked. Stocking densities generally range from 900 to 1,500 tails per 1,000 square meters. At the same time can put appropriate amount of carp species, feeding and management methods as described earlier.
In the adult fish ponds, 150 to 300 freshwater whitefish can be mixed per 100 square meters. Under the premise of ensuring the production of domestic fish, 75 to 150 kilograms of freshwater fishes can be produced. Since freshwater whitefish are more sensitive to drugs such as trichlorfon, they must be splashed with 0.5-0.7ppm crystal trichlorfon in advance about 15 days before the freshwater whitefish is introduced. If freshwater whitefish and summer flowers are to be served, they should be fortified and cultivated in a small pond in Tangjiao, so that they can be stocked after reaching the similar specifications as the Tangzhong family. Polyculture pond management is similar to ordinary heavy ponds.
In terms of fishing techniques, due to the fact that freshwater and whitefish are clustered and live in the lower waters, the Internet access rate is very high. Generally, the first network can capture 80% to 90% of the total. Freshwater white plover has a high catch rate, so it is also a good type of fishing. Freshwater white fleas are resistant to disease.
However, we must also pay attention to the main prevention and control targets for fish disease prevention and control:
1 hydromycosis. The water temperature of 13°C to 20°C is a period of high incidence, and fish injuries are prone to occur.
2 anchor head disease. Summer fish species are easy to get the disease, irritation, redness and necrosis of the affected area.
3 white skin disease. It is a bacterial disease that mainly affects overwintering fish.

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