1, species selection Select the Guangdong Luye Ao tilapia which is resistant to low temperature, fast growth and strong disease resistance. 2. Pond conditions Choose a pond with sufficient water, good water quality, safety, no pollution, and easy injection and drainage. An area of ​​5 to 10 acres, a maximum of 15 acres. The water depth is generally 1.5-2 meters. 3, fish species stocking Before stocking, the pond should be cleaned and disinfected. The pool water depth of 10 cm per mu with lime 75 kg or bleaching powder 1 kg, 15 days after the irrigation can put fish. However, for safety reasons, use squid to test water before putting fish. (1) Specifications of fish species wintering large-scale fish species or the fish species that were bred in the current year, stocking specifications can reach 3-5 cm or more, and the specifications should be as tidy as possible, and the physique is strong, without injury or illness. (2) Stocking time Tilapia grows in natural conditions and its water temperature must not be less than 18 degrees. It is not until the water temperature is stable above 18 degrees that fish can be stocked. Combined with the reality of my county, it is generally available from the end of March to the beginning of April. (3) Stocking density According to the conditions of the pond, the size of the fertilizer, feed source, and stocking species are determined. There are 80 large-sized squid and 50 squid per mu. 1 Single tilapia. At the end of March, 25 g/tail winter large-sized fingerlings are stocked at a stocking density of 1,500 tails per mu. The stocks that were reared in the year of stocking are 2500-3000 tails per acre, and can be reared to 0.4-0.6 kg/tail for 8 months. Listing specifications. After clear ponds, vacant ponds can be used to cultivate large-sized fish species for seeding in the following year. 2 mixed tilapia. Without reducing the density of the main cultured fish, the polyculture of 3–5 cm tilapia per acre has 800–1200 tails, and the average yield of tilapia is up to 400 kg. 4, feeding and management Tilapia is an omnivorous fish. It prefers to eat plankton, organic debris, and artificial feed. Therefore, it is mainly feeding and fertilizing. (1) Fertilization Tilapia requires fertile water regardless of whether it is monoculture or polyculture. The plankton in the fertilizer water is rich, while the fertilization is to cultivate the plankton for tilapia feeding, and the sinking residue of the fertilizer can be directly used as the food of the tilapia. Therefore, in the case of ensuring that dead fish is not lost, regular fertilization is required to maintain the fertile water, and the transparency should be 25-30 cm. The amount of fertilizer to be applied is 150 kg to 200 kg of fermented manure or 300 kg of green manure per mu per week. (2) Feeding feeds once a day at 8:00 to 9:00 and 14:00 to 15:00, and the daily feeding amount is 2% to 3% of the fish's body weight. Soybean cake and rice bran should be soaked and then fed. Before or after the weather is hot or thunderstorm, you should feed less or stop feeding. (3) Day-to-day management Every morning and evening, you should inspect the ponds to observe the fish's eating and drinking conditions and water quality changes in order to determine the number of feeding and fertilizing. Every 15 to 20 days, water injection once, every 5 to 10 acres of ponds with 2 kilowatts of impeller type oxygen aerator, every day in the afternoon and early morning each boot once every 2-3 hours, the high temperature season may be appropriate to increase the number of hours. 5, fish disease prevention In the breeding process, we must adhere to the principle of “prevention as the main and treatment as the secondaryâ€. Every 10 to 15 days, every cubic metre of water shall be treated with 20 g of quicklime or 1 g of bleached powder to dissolve in the water and the whole pool shall be sprayed once evenly to prevent fish. Epidemic. Found that fish eat less or do not eat, swimming slowly, often floating surface, timely inspection and take appropriate treatment measures. 6, harvest Determine the catch time according to the discharge specification or market conditions, but when the water temperature drops to 12°C, all tilapia should be listed.
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