Freshwater whitefish breeding technology

Freshwater whitefish are edible and ornamental fish. The meat is delicious, mixed, fast-growing, disease-resistant, resistant to hypoxia, and easy to fish. It can be cultivated individually or in combination.

First, living habits

Freshwater cockroaches inhabit in the mid- and lower-water layers and are clustered, capable of withstanding 0.48 milligrams per litre of hypoxia; suitable for pH values ​​from 6.2 to 7.5. The growth temperature is 21°C to 32°C, and the optimum growth temperature is 28°C to 30°C. Not intolerable to low temperature, the temperature of the rearing species must be above 17°C and omnivorous.

Second, artificial breeding

The Yangtze River basin generally conducts broodstock breeding in mid-to late October. Well-selected water quality, convenient drainage and irrigation, there is a hot water office at the establishment of broodstock cultivation pool. Outdoor pool 1000 ~ 1500 square meters is appropriate, depth of 1.5 to 2 meters, water temperature maintained at 20 °C above, stocking capacity of 180 to 370 kg per 1000 square meters. Indoor insulation pool area of ​​50 to 200 square meters, water depth of 1 to 1.5 meters, water temperature maintained at 20 °C ~ 26 °C. The density of stocking in the still pool is 2 to 3 kilograms per cubic meter, and the temperature of warm water can be increased to 5 to 7 kilograms. Pool water hyacinth, ovum and so on. The protein content of the feed should not be less than 25%, and the daily feed amount should be 1% to 3% of the fish's body weight. The feed should be fed on the food table.

Freshwater white oysters are most suitable to produce water temperature is 25 °C ~ 28 °C, the Yangtze River Valley in May warming up production. According to gonad development, mature broodstock was injected with oxytocic acid. Injections usually take place in the evening. After the oxytocic injection, the body color of the broodstock is changed from silver to light black, and the male and female fish are crouching and squeaking, and they chase each other. Natural mating or artificial insemination can be performed at this time. The fertilized eggs are hatched in hatching barrels, and the hatched fish fry are cultivated into summer flower fingerlings for about one month.

Third, breeding technology

Commercial fish farming generally adopts three modes of pond single-cultivation, pond polyculture, and nesting in fingerling ponds, of which the monoculture management is convenient and the economic benefits are significant.

Generally, when the outdoor water temperature meets the requirements in the end of May and early June, it can be stocked. Each 1,000 square meters of water can be filled with 1/5 of the total fish. Feeding amount is generally 4% to 6% of fish weight. The drop in water temperature should be promptly arrested and listed. After the end of October, Jiangsu and Zhejiang provinces generally started catching or warm water conservation.

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. In the adult fish ponds, 150 to 300 freshwater fishes can be mixed per 100 square meters. Under the premise of guaranteeing the production of domestic fish, 75 to 150 kilograms of freshwater fishes can be produced. Since freshwater whitefish are more sensitive to drugs, they should be splashed with 0.510-6 to 0.7 10-6 crystals of trichlorfon in a concentration of 0.510-6 to 0.7 10-6 before the freshwater white mullet species are released. If freshwater whitefish and summer flowers are to be served, a small pool of ponds should be fortified and cultivated beforehand in Tongjiao, so that they can be stocked after similar specifications with those of the Tangzhong family.

Freshwater white plover has a high catch rate, so it is also a good type of fishing. Pay attention to the prevention of water mildew, anchor head disease, white skin disease.

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