Freshwater Whitefish Breeding Technology

Freshwater White Stork originates in Brazil's Amazon River in South America, which is tropical and subtropical food and ornamental fish; the largest individual in the country of origin is 20 kg. Freshwater white quail meat is delicious, mixed, fast-growing, resistant to disease, resistant to low oxygen, easy to catch, can be single-cultivated or polyculture.

First, living habits

Freshwater cockroaches inhabit in the middle and lower reaches of the water, clustered, able to withstand 0.48 mg / L hypoxia; pH to adapt pH 6.2 ~ 7.5. 16 °C began to eat normally, the growth temperature of 21 °C ~ 32 °C, the optimum growth temperature is 28°C to 30°C. Freshwater ferrets are not tolerant of low temperatures, and the temperature of the rearing species must be maintained above 17°C. When the water temperature is 12°C, large

Some adults lost their balance and died at 8°C. For omnivorous fish, ingest food. The larval stage feeds mainly on plankton, and young fish also eat organic detritus and artificial feed. At the fish stage, they eat plankton, algae, and various animal and plant feeds such as dead fish, scorpion fish, fish meal, various mixed feeds, rice bran, wheat bran, melon, vegetables, etc. one

Individual fish up to 0.5 to 0.75 kg. Three-year-old mature, spawning several times a year. When the water temperature is 25°C to 30°C, artificial oxytocin production can be performed.

Second, artificial breeding of freshwater whitefish

In the middle and late October of the Yangtze River basin, broodstock is selected for broodstock wintering. The broodstock cultivation pool has good water quality, convenient drainage and irrigation, and pools with excess hot water. Pond pre-cleaning disinfection, outdoor pool 1000 ~ 1500 square meters is appropriate. Water depth of 1.5 to 2 meters, water temperature maintained above 20 °C, stocking capacity of 180 to 370 kg/1000 square meters. Indoor insulation pool is generally 50 to 200 square meters, water depth of 1 to 1.5 meters. Oxygen-increasing equipment should be set up in the pool, and the water temperature should be kept between 20°C and 26°C according to the conditions, and the water temperature should be kept relatively constant during the winter. It is advisable that the stocking density of the lagoon be 2 to 3 kg/m3, and the temperature of warm water can be increased to 5 to 7 kg/m3. Before stocking, the fish was sterilized with 20 ‰ salt solution for 15 minutes. Pool water hyacinth, ovum and so on. Weekly change of new water according to water quality. The protein content of the feed should not be less than 25%, and the daily feed should be about 1% to 3% of the fish's body weight. The feed should be fed on the food table. Usually pay attention to the prevention of fish disease.

The optimum temperature for the production of freshwater pelicans is between 25°C and 28°C. In the Yangtze River basin, warming and oxydoping are generally conducted in May. According to the gonad development, the mature broodstock was selected as female: male 1:1 injection oxytocin. The injection time is usually performed in the evening so that the broodstock lay eggs at dawn. After the oxytocic injection, the body color of the broodstock is changed from silver to light black, and the male and female fish are estrus. The squeaks of "pecking and licking" are issued and chasing each other. Natural mating and fertilization or artificial insemination can be performed. Fertilized eggs usually hatch in the hatchery barrels. The hatched fry were cultivated as summer fish species in about 1 month.

Third, the freshwater fish 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

The management method is as described above.

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 prevention and control of fish diseases as the main control objects: 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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