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EU black and white seedlings breeding and common disease control (1)
Feeding and management of European white young seedlings 1. Thoroughly disinfect the old pond before use. Use 200 mg/l quicklime or 20 mg/l bleach to disinfect the whole pool. Scrub after 7 days, inject new water, and then use 30 mg/elevation of potassium manganate Quanchiposa. After 3 days, wash and drain the water and wait. If it is a new cement pool to be fully immersed, can choose 1 mg ~ 1.5 mg / l oxalic acid Quanchiposa splashing, dipping and changing water, usually takes 15 days to 20 days. Determine the pH before use. Two days before the seedlings, 20 mg/g of potassium manganate was splashed and disinfected for 3 days. After washing, the water was discharged for use. 2. Seedlings choose to buy a healthy, no trauma, transparent, neat, healthy and lively white seedlings. The general specification is 2700 to 3200/kg. Before laying the seedlings, the water level of the White Tsai Pond was maintained at about 30 cm, the pH value was 6.8 to 7.2, and the salinity was 7 to 8 ‰. 3. Baizaixiatang The oxygenated seedling bags are first soaked in the pool for 20 minutes to 30 minutes, so that the water temperature inside and outside the bag is basically the same. Set dense mesh cages in the tank and unwrap the seedling bags in the tank so that the white horses can swim into the nets themselves. After 3 minutes to 5 minutes, slowly lift the cages against the water and allow the seedlings to swim into the pools themselves. Timely remove the disabled and dead seedlings. Twenty-four hours after the start of white Tsai heating, according to 6 hours 1 °C ~ 1.5 °C slowly warming and daily change of water 1/6 ~ 1/4, 4 days ~ 5 days, so that the water temperature controlled at 24 °C ~ 25 °C. 4. Domestication feeding When the water temperature rises to 20 °C ~ 24 °C, pool water desalination to 2 ‰ ~ 3 ‰, you can begin domestication feeding. Before the feeding, the aerator should be turned off, and 25% to 25% of the weight of the seedlings should be fed with red worms (silkworms). When feeding red worms, they are fed along the edge of the pond and above the bait station. A small amount is sprinkled into the center of the pond. The grazing and dropping is fed for 2 days to 3 days before feeding at regular intervals. Every day, 3 meals to 4 meals are fed and each meal is fed. After clearing the pool, it should be drained in time, and then part of the water should be injected to maintain the water level of 50 cm to 60 cm. With the rapid growth of seedlings, the amount of daily feeding is gradually increased, which is 30% to 40% of its body weight. After 25 days to 30 days of domestication of seedlings, physical fitness and vitality have been enhanced, and feed conversion can begin. The daily feed rate on the first day of feed conversion was 8% to 10% (including 70% for red worms and 30% for white larvae), mixed and mixed with paste. On the third day, 50% of the feeds were fed with red worms and white larvae. On the fifth day, white feed increased to 70%, and red worms decreased to 30%. After the seventh day, it was completely converted and fed with white litter compound feed. The daily feeding rate is reduced to 5% to 8%, and it usually takes 10 minutes to 15 minutes for feeding to finish. 5. Red worms rinsing and sterilizing. The newly purchased red worms are put into a holding tank. The micro-water is continuously rinsed and often agitated so that the internal waste can be drained. Then the screen mesh is covered and the razor wire is scraped from the mesh surface. The live red worms were placed in other pools to continue rinsing, repeated several times, and flushed to remove dead insects and dirt. Before feeding the red worm must be strictly sterilized. The worms can be sterilized with 5 g of salt or furazolidone (0.5 g/kg). After 30 minutes, 0.5 g of oxytetracycline per kilogram of red worms is fed. 6. Water quality management Europe likes fresh water quality and undercover habitat. During the cultivation of white seedlings, physical and chemical indicators are required to be stable. In particular, the fluctuation range of water temperature and pH value cannot be too large. Generally, the water temperature is required to be around 25°C. Within 1°C. The pH values ​​of Xihe and reservoirs in the mountains of northern Fujian are generally low, around 6.5, and 10 mg/liter of quicklime is used to adjust the pH to a value of 6.8 to 7.2. Due to the high stocking density of white young seedlings and the large amount of feed, it is easy to increase the levels of ammonia, nitrite, hydrogen sulfide, and other harmful substances in the water. The pathogenic organisms multiply and cause water quality deterioration. For this purpose, the bottom of the pool should be cleaned after 2 hours to 3 hours of feeding to remove dirt. About 20 centimeters of water is drained each time, and then the new water is added to make up. The amount of water exchanged per day is more than double the original pond water body.