European eel's adult clam culture is the practice of puppies weighing 15 to 20 grams or more, after meticulous breeding for 5 to 6 months. In the process of adult breeding, special people are responsible for feeding management, controlling water temperature, regulating water quality, determining physical and chemical factors of water quality, strengthening disease prevention and control, and enabling carp to ingest food and activities in a good environment, and promote the rapid growth of carp in each stage. In the shortest possible time, we will develop commodities as soon as possible to achieve the goal of reducing costs and increasing commodity rates and economic returns. The farming techniques of Chengyu are introduced as follows: 1. Aquaculture ponds and their disinfection 1. Aquarium facilities: Indoor cement pools with stone (cobblestone) sand bottom and pot bottom type. The area is 150-360m2, and its shape is a rectangle or square with no corners. The depth of the pool is 1.1-1.3m and the water depth is 0.8-1.0m. Each pool is divided into a water outlet, the water inlet is located at the top of the pool wall, the sewage outlet is located at the center of the bottom of the pool, and the steel is welded into a dense grid plate to cover the sewage outlet. The diameter of the drainage pipe is more than 20cm, and the automatic overflow of the dark pipe is used. The top of the Dianchi Lake is covered with steel or bamboo, and the top is covered with black plastic film or black plastic mesh. Water quality is required to be free from pollution, fresh, and sufficient water sources for rivers and reservoirs. 2. Disinfection in Culture Ponds: Intensive culture ponds should be sprayed and disinfected with 200mg/L lime or 20mg/L bleaching powder before putting them into the pot. 3 to 4 days later, the rejuvenation tanks should be filled with fresh water, and then the concentration should be 30mg/L. Potassium permanganate was immersed and disinfected. After 2 to 3 days, the wall of the pool and the bottom of the pool were washed and drained. Second, the kind of stocking 1. Preparation before release: squid requires a healthy, fullness, disease-free without injury. The general pool water temperature is controlled at 22 ~ 26 °C, the pool water depth is maintained at 0.9 ~ 1.0m. Two 0.75kW aerators are installed at each corner of the Dianchi Lake to ensure sufficient dissolved oxygen in the water to provide a comfortable and good environment for the carp. 2. Stocking densities: It depends on the water quality and water source of different specifications and intensive culture pools. Generally 40 to 70 tails per kg of quail species, 100 to 150 tails/m2; 20 to 40 tails per kg of larvae, 80 to 100 tails per m2. Disinfection should be promptly disinfected with the drugs after the sub-category is placed to prevent the carp from being injured by bacterial infection during the operation of pulling the net. After disinfecting, a large amount of water must be changed to maintain the fresh water quality of the Dianchi Lake so that the carp can feed normally and promote its growth. Third, feeding management 1. Daily feeding amount: the initial period for the baby feed, when the weight of 50g / tail or more, use adulterated feed. When the general specification is 100-200 tails/kg, the initial cast black feed gradually feeds with larvae, and the feed rate is 4% to 5%; when the feed size is 20 to 100 tails/kg, the feed is fed to the calves. The bait rate is 2.5% to 3.5%; when the specification is below 20/kg, the bait rate is 1.5% to 2.5%. When stirring the feed, according to the amount of feed, add fresh water according to a certain proportion. Generally, the ratio of water to feed of young calf feed is 1: (1.2~1.4) for feed: water; the ratio of feed to water for adult calves is 1: (1.1). ~1.4). At the same time depending on the level of water temperature to add fish oil, when the water temperature at 18 ~ 23 °C when adding 5% to 7%; water temperature at 24 ~ 26 °C when adding 7% to 9%. After feeding, the juvenile bait can be adjusted to be softer, and the bait can be adjusted to be harder. The agglomerated bait should be sticky, elastic and stretchable and not easily dissipated in water after feeding. 2. Feeding bait: To achieve the "four principles" principle. (1) Timing: 5 to 6 o'clock in the morning, 12 o'clock in the afternoon, 5 to 6 o'clock in the evening, and 12 o'clock in the morning. Feeding amount is about 60% of the daily feeding amount before noon, and 40% of the daily feeding amount after the evening; (2) Positioning: Each rectangular pot should be set with a rectangular fixed bait station welded with steel bars, and domesticated with European positioning. Feeding habits; (3) Qualitative: The quality of carp feed directly affects the healthy growth of carp. To use the artificial full-price artificial compound feed, it is required that the crude protein content of the young quail feed should be 46%, and the high-quality feed with a low feed coefficient should be 45%. High-quality quail feed can enhance the body composition of the European eel, increase appetite and promote the rapid growth of eel, and vice versa. (4) Quantitative: The amount of feed should be based on different specifications of carp. And according to the climate, water temperature, water quality, growth and feeding conditions of squid increased or decreased, to avoid excessive waste and pollution of water quality. 3. Feeding management: In summer, due to higher temperature and water temperature, the carp feeds strongly, and it is necessary to properly control the amount of feed to prevent disease outbreaks. It is advisable to feed 3 times daily; the weather is cool in autumn, and the water temperature is more suitable for the growth of barnyardgrass. The amount of bait may be increased appropriately. Daily feeding is appropriate for 4 times. The temperature and water temperature in winter gradually decrease. The amount of feed is generally 1.5%-2%, and it is fed 2 or 3 times a day. In spring, the temperature and water temperature gradually increase. As for the rise, the daily feeding amount can also gradually increase with the increase of the water temperature. It is advisable to feed 3 to 4 times daily. IV. Water Quality Management Ouyang has a relatively high requirement for water quality. pH, dissolved oxygen, ammonia nitrogen, nitrite nitrogen, and temperature in the pool water all directly affect the feeding and growth of carp. For this reason, how to control the water quality changes in adult clams, so that the eel can enter the pool, that is, there is a suitable living environment, which is the primary problem to be solved. In the summer high temperature period, it is necessary to increase the amount of water exchange and strengthen the scrubbing and sewerage work. The daily water exchange volume should generally be 1.2 to 1.5 times. The top cover of Dianchi Lake should be covered with a black plastic thin net, which should be shaded and ventilated. Two 0.75kW aerators can be used in a small area of ​​Dianchi Lake, and two 1.5kW oxygen aerators can be used in a large area to ensure sufficient dissolved oxygen in water. In addition to deepening the pool water depth, in order to maintain normal water temperature in winter, Daily water exchange control is controlled at 0.6 to 0.8 times. At the same time, regular splash of 10 ~ 20mg/L lime to adjust the water quality. In addition, the NH4+-N, NO2--N, pH, and DO of the pool water should be periodically monitored to timely grasp the dynamics of the water quality and take timely measures. Fifth, the election by the sub-culture due to the continuous differentiation of carp growth, weight difference is wide, it should be timely screening sub-culture, to avoid catching poor feeding of small-sized carp growth stagnation, affecting production. The sub-pool should be screened once every 45 to 60 days. Before the sorting, prepare the separation and maintenance pools, disinfect the cages in time, fill them with water, wait for the use of the cages, collect the nets, and select other tools. The screening of the fish was carried out using a fish screen with water. According to the specifications of different squid, they will be fed into the stocking pool and continue to feed. VI. Prevention and treatment of leeches in Europe During the breeding period of European eels, after many years of microscopic examination, the main diseases are: parasitic diseases include echinococcosis, pseudo-cycloposis, trichoderma, scombrovirus, trichoderma, sticky Spore disease; Bacterial diseases include rotten tail disease, gill disease, red fin disease, enteritis disease, red head disease, de-viscosity disease, red spot disease, and Edward's disease; fungal diseases include hydromycosis and mold mycosis. In addition, organophosphorus poisoning: "yishubao" or "milur" pesticide poisoning. Its prevention and control methods: 1. Parasitic diseases: In the treatment of genital warts, some medicines may increase according to the temperature and the water quality. (1) Squash echinococcosis: Mercury nitrate 0.1 to 0.2 mg/L Quanchiposa; (2) Protozoa parasitosis: compound mebendazole 1.0 mg/L drug bath for 18 to 24 hours; (3) Trichodinosis : Insecticidal 0.3～0.4mg/L bathing for 18-24 hours; (4) Fleshia Worms: Hundred insects kill 2～3mg/L medicine bath for 12～24 hours or compound mebendazole 0.8～1.0mg/L medicine Bath for 12 hours; (5) Myxosporidiosis: Treatment Spore Ling 10 ~ 12g/kg feed, hot water immersion condiments fed even 5 to 7 days. The above drugs can achieve good results in the treatment of parasitic diseases. 2. Bacterial diseases: The combination of oral administration and external use is effective. Common internal medicines include: oxytetracycline, chloramphenicol, erythromycin, allicin, yeast powder, Lee Wei San, salt, Baogan Ling, vitamins, sulfonamides and other mixed feed; external use of mainly permanganate Potassium, formalin, salt, quicklime, furans, antibiotics, chlorine disinfectants, Chinese herbal medicine, etc. 3. Fungal diseases: (1) Saprolegnia: salt 7 to 3 to 5 days for bathing, malachite green 0.1 to 0.2 mg/L for sprinkling or water mildew for 0.3 to 0.5 mg/L for 2 days; (2) ) Scab disease: malachite green 0.1 ~ 0.2mg / L plus formalin 30mg / L, once every 3 to 4 days; methylene blue 1.5 ~ 2mg / L spill, use for 3 days. 4. Organophosphorus poisoning: In recent years, the county's late rice and early season rice “rice blast disease†occurs annually. Commonly used per mu of rice field 10% Yishu Bao or 3% Milur granule pesticide 1.25kg, mixed with fine soil application. When it rains or drains, poisonous water from farmland is discharged into the stream. When the stream is used to extract stream water, salmon poisoning often occurs. Some fields poison 2 or 3 times a year, causing serious losses to the market. Control methods: (1) The farmland and the village are closely coordinated. When the villagers use Yishubao or Milur pesticides to kill the rice gall midge, they are uniformly used to avoid the use of stream water; (2) A large amount of new water is replaced during poisoning. (3) Atropine sulfate 4 ~ 6 tablets / kg feed, continuous feeding 3 to 4 days; or with atropine sulfate 24 ~ 26 / m3 water Quanchiposa, the effect is very good.
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