I. Environmental Requirements The establishment of a production base for green food and aquatic products must be scientifically selected and the soil analyzed to determine whether it is suitable for aquaculture production. Ponds should avoid toxic chemical contamination or choose areas where pollution can be controlled. The environmental conditions of the pond directly affect the growth of the fish. At present, there are many fish ponds that are old ponds, and they must be reformed for healthy farming. There are three clear ponds: 1. kill the wild fish and aquatic insects that are harmful to the fry; 2. remove weeds and kill bacterial pathogens and parasites in the pond water and sediment; 3. reinforce the pond base. After dredging, it is disinfected with quicklime or bleaching powder, which is generally a clear pond with water. A water depth of 1 meter can use 150 kg of quicklime or 5 kg of bleaching powder to add hydration, and the whole pool can be sprayed evenly. The time of drug selection is carried out when the temperature is high at noon on sunny days, so that the disinfection effect of the clear pond can be improved. Pay attention to the selection of high-quality, light-weight lump of quicklime, with less use and clear ponds. Second, the selection of seedlings and seedlings 1, the choice of fry pay attention to the inspection of fish farms in the hatching of fish eggs and fry cultivation process do not use large residues, does not meet the healthy culture of drugs, such as: malachite green, chloramphenicol and so on. When purchasing fish fry, we should choose the fishery that has a good reputation and technical skills. Robust fish fry is an important material basis for feeding food fish. The specific identification indicators are as follows: (1) Large and tidy, with small back, thick head, bright body, moist muscle, no parasites; (2) lively action, cluster swimming , When in fright, quickly swarm into the bottom of the water, have strong ability to catch food; like to swim under the water in the container, and swim against the water; (3) Do not choose sharp-mouthed owl (tipy cub), do not choose fat oyster, General long fry is better; choose 3 inches of fry but also be careful, if it is a bit swollen, you can cut open to see if there are no parasites. 2. Before the release of the fry, the pond water is disinfected before putting on the seedlings. Normally, 1.2-1.5 m of water is put, and then the tea seed is used for clear pond disinfection. The dosage is 25 kg/mu. 5-6 inch long carp seedlings, in the depth of 1.5-1.8 meters of fish ponds, can be stocked about 1,000 per acre, and 3 inches long carp seedlings are put about 1200. This is because the 3-inch-long fish seedlings are weak and easy to die. Feeding fodder and formulated feeds, fry can grow to 1.5 - 2 pounds a year. Third, the development of fish species to fish-based model of carp in the Pearl River Delta region is generally raised three per year as well. The first creation was from the beginning of January to 3, April, the second was from April to July and August, and the third was from August to the end of the year. The general rule is 80:20, and the main fish account for 80%. IV. Feeding medications 1. Feeds are formulated with compound feeds that meet the green food production standards. After the feed additives contained in fish are eaten by fish, residues in the fish body must not be harmful to the human body. They must not contain hormones, olaquindox, and salmonella. Wait. For the cultivation of green fodder, the use of pigs, cattle, sheep, chickens, ducks and other livestock excreta and urea, diammonium phosphate, and other fertilizers are not allowed. The last fertilization is carried out 30 days before catching. Feeding compound feed with many feeds and good quality (low feed coefficient and no deterioration) is an important measure for high fish production stability. The scientific feeding method is to use a feeding machine. The feeder feeds evenly and the feeding area is large. It is very easy to introduce fish to the surface to snatch food, increase the utilization of feed, and reduce the feed coefficient. 2. Drugs In the prevention and treatment of fish diseases, the used fishery drugs must be produced by regular manufacturers, with production licenses, approval numbers, and production execution standards. When administering medication, it is necessary to prescribe the right medicine, accurate dosage, and strictly follow the product instructions. V. Breeding management 1. Everyday technicians or managers of Xuntang insist on touring the pond early and late every day to observe the water quality. According to the weather, water quality, fish activity, etc., the fish floating head, start-up situation, fish disease, or deterioration of water quality will be determined. Take measures to prevent fish from floating for a long time at night. 2, remove the dirt every morning to remove the grass side of the grass, leftovers, dead fish and other garbage, so as not to pollute the water quality breeding bacteria. 3. Science Feeding Feeding feed in accordance with the principles of “quality, quantity, timing, and positioning†scientifically feeds feed and eliminates direct water pollution caused by feed loss. 4. At noon, the machine uses the impeller aerator to mix water and aerate. It is turned on and off at noon on a sunny day with no wind or small winds. It eliminates the dissolved oxygen and temperature difference between the upper and lower layers of the water and makes the harmful gas in the bottom layer escape. Out, eliminate oxygen debt. If the aerobic power and the aerator power specifications are appropriate, the water body can be completely mixed within 30-40 minutes after power on. Otherwise, the boot time will increase to achieve the purpose. 5. Change the water regularly Change the water according to the change of water quality. When the water temperature is lower than 25°C, water is added 1-2 times per month and the water exchange rate is 10-20 cm. When the water temperature is higher than 25°C, water is added 4 times per month, and the water exchange rate is 5-10 cm. If necessary, a large amount of water is changed. When changing the water, appropriate measures should be taken according to the cleanliness of the water source. If the water outlet is set with a 14-20 mesh sieve to make a 80-150 cm Filter bag, and the water source is in the high tide section, the time for adding water should be adjusted flexibly to avoid pollution. Peak period. 6, regular disinfection If the water temperature is 18-25 °C, once a month disinfection; water temperature 25-28 °C, disinfection once every 20 days, 28 °C above when disinfection every 15 days, the actual operation is determined according to the specific circumstances. Disinfection medications include quicklime, bleach, and chlorine dioxide. The three drugs are used interchangeably. The amount of quicklime is 10-15 kg/mu, and the amount of bleaching powder is 0.67-1 kg/mu. The specific dosage depends on the quality of the water and water (more use of water and fertilizer, less use of water, low temperature, more use of low temperature, less use of high temperature), pulp The whole pool is spilled evenly. Chlorine dioxide is applied after deployment according to the instructions. The dosage is generally 1-1.5 times as described and the treatment dose is not more than 2 times. Disinfection is generally performed after adding water or fish and killing insects. Put fish, scrape fish, kill insects must be promptly disinfected, chlorine dioxide disinfection effect is better. 7. Pond clearing Every year in winter, sludge is raised with a mud pump and clear lime is used once.
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