European black and white seedlings breeding and common disease control (2)
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September 20 05:01:06, 2024
The breeding and management of the European black young seedlings The European young black seedlings are reared with the tail seedlings weighing 0.26 to 0.32 grams for 30 days to 35 days, making them become tail weights of 2 to 3 grams. the process of. 1. Feeding ponds and seedlings for disinfection After breeding black leeches, 200 mg/liter of quicklime or 20 mg/litre of bleaching powder shall be used to disinfect the whole pond before use. After 4 days to 5 days, wash and drain the water and inject new water. Use 30 mg/liter. The whole pool of potassium manganate is splashed and washed for three days. Black seedlings should be disinfected with drugs immediately after stocking, so as to prevent infection during the selection and fishing operations. Normally use salt or furan drugs to disinfect. Never use drugs that are irritating to skin. After disinfection, a large amount of fresh water should be injected to keep the water fresh and increase the appetite of the black seedlings. 2. Feeding management choose stable quality black feed. After screening, the black seedlings of small size can continue to be fed with white feed, and the feeds can be turned into black feeds until the specifications are reached. Black seedlings that have reached the specification can be converted to black feed. Feed should be added with fish oil as well, the mixed feed is soft and inflated, strong in viscosity, difficult to disperse, high in utilization, and less in loss. The number of feedings per day is 3 to 4 times, depending on the season. Feeding time is from 5am to 6am every morning and midnight. Due to different seasons throughout the year, feeding time in the morning and evening can be adjusted. 3. Sewage and water change After feeding every day, the bait station should be washed in a timely manner and lifted off the water surface to dry. After 2 hours to 3 hours after each feeding, the bottom of pond clearing pool, the wall of brush pool, and the residual bait and excrement should be eliminated. The amount of water to be changed should be determined according to the amount of seedlings and the temperature change. Generally, the displacement will be 15 cm to 20 cm at a time, and the new water will be added later. When changing the water, be careful to keep the pool water temperature at 25 °C ~ 26 °C. The prevention and treatment of common diseases of white and black seedlings was observed by microscopy for many years. During the breeding period, the disease was found to have Edward's disease, rotten tail disease, gill disease, red fin disease, and enteritis disease. Red head disease, demyxosis, and small echinococcosis, trichoderma, pseudo-cynomolosis, myxosporidiosis, fish-wave beanworm disease, and fecal worm disease. The main treatment methods are as follows: 1. Bacterial diseases are treated with a combination of internal medicine and external medicine. The effect is good. Commonly used internal medicines mainly include: oxytetracycline, chloramphenicol, allicin, norfloxacin, sulfonamides, yeast powder, Lee Wei San, salt, quicklime, bleaching powder, furans, antibiotics, chlorine disinfectants, Chinese herbs. At present, there are large bacterial diseases and serious deaths are caused by bacterial sepsis and de-adherence. Treatment methods (1) Use 10 mg to 20 mg/L of Huanglian, 3 mg to 5 mg/L of rhubarb, 3 mg to 5 mg/L of astragalus, 4 mg to 5 mg/L of gallnut, and 2 days of decoction. ~ 3 days; (2) iodine iodine 1 mg ~ 2 mg / liter + furazolidone 3 mg ~ 4 mg / liter spill, used for 2 days; (3) norfloxacin 1 g ~ 2 g / kg feed, or ciproflox Star 0.5 g ~ 1.0 g / kg feed fed 2 days to 3 days, the effect is good. The above two diseases should be carefully observed from the white to the black seedling rearing stage. Once the signs are found, they should be promptly treated. Severe cure time is long, short half a month, the elderly from January to February, easy to cause a large number of deaths. Onset of a long time will affect the growth of carp, and the proportion of three types of seedlings may increase. 2. Parasitic disease Squash Ichthyosis (1) Malachite green 0.2 mg/L Bath for 12 hours to 24 hours. (2) "Exterminator" No. 2 1 mg ~ 2 mg / L Quanchiposa, used for 2 days to 3 days. (3) Mercurous nitrate 0.08 mg to 0.1 mg/L Quanchiposa. It is intended that the ringworm disease (1) uses compound mebendazole 0.6 mg to 0.8 mg/L in a medicinal bath for 12 hours to 24 hours. (2) "Exterminator" No. 2 1 mg to 2 mg/L bath for 12 hours to 24 hours. Trichodinosis (1) with copper sulfate and ferrous sulfate mixture 0.7 mg / l drug bath 18 hours to 24 hours. (2) "Insecticidal" 0.2 mg to 0.3 mg/L Medication bath for 12 hours to 24 hours. Bacillus fusiformis (1) Use "hundred insects to kill" 2 mg to 3 mg/l medicinal bath for 18 hours to 24 hours. (2) Compound Mebendazole 0.6 mg to 1.0 mg/L Medication for 12 hours. (3) "Insecticidal" 0.2 mg to 0.3 mg/L Medicated bath for 12 hours to 24 hours Myxosporidiosis (1) Use "Salbicide" 5 g ~ 6 g/kg feed, soaked in hot water for 5 hours ~ After 6 hours, the concoction mixed feed was fed for 5 days to 7 days. (2) "treatment spore" 3 mg ~ 5 mg / l hot water soaking, juice and even splash 3 days to 5 days. Fish puffer bean disease (1) with copper sulfate and ferrous sulfate mixture 0.7 mg / l medicine bath 12 hours to 24 hours. (2) 7 to 8 食 bath salt bath 18 hours to 24 hours. (3) Formalin 30 mg to 50 mg/L bath for 12 hours to 24 hours.