Blackfish is a valuable freshwater fish with high economic value and is known as "treasures in fish." Black-fish adult fish farming refers to the production of various fish species into ponds, ponds, ponds, cages and other small water bodies. In recent years, the main focus is on ponds with high density and monoculture. The following is a brief description and is for reference only. First, the preparatory work before breeding. 1. Breeding facilities: soil ponds, concrete pools, etc. Water depth to 1-2 meters. Water lifting equipment. 2. Water source: River water, reservoir water, underground well water, etc. Water quality should be neutral or slightly alkaline. 3. Area: In order to facilitate production management and sales, the area of ​​the fish pond should be smaller, preferably about 1 mu, and the maximum should not exceed 2 mu. 4. It is best to have a water outlet. There must be a 40-60 cm fence around the pool to prevent escape. 5. Plant aquatic plants on the surface of the pool (generally not exceeding 20% ​​of the area of ​​the fish pond), as a evasion object, which is convenient for sheltering the sun, avoiding heat and predation, and purifying the water and regulating the water temperature. 6. Pond clearing and disinfection must be done before the fish species are released. Second, aquaculture technology. 1. Fish species stocking: 1 Fish species specification: Use 10 cm or more (preferably 10-14 cm, 60 g - 100 g). When the fish species are the same, the fish species must have the same specifications, and no injury or illness. 2 Source of fish: It is best to choose locally produced fish species. 3 stocking time: the best in the year from September to early October is better, you can eat to restore constitution, improve survival rate overwintering. Years of stocking should be in March-April. 4 disinfection: before the next pond must be strictly disinfected, generally soaked with 5% of salt water for 10-15 minutes or 10PPM malachite green solution soak for 10 minutes. 5 Stocking density: The water depth is 1.2-1.5 meters, 50-60 grams of fish species will be put into 8000-9000 acre per acre, 80-100 grams of fish species will be put in 5000-6000 acre per acre. If the average water depth is reduced, the stocking capacity will be reduced accordingly. 2. Feeding management: Feeding should adhere to the "four set", that is, qualitative, quantitative, timing, positioning. Before the feeding, a “sensory†response is formed by the “sound†of the beat and the black fish is collected around the food field, which easily creates a predation situation, increases food intake, and reduces food waste. The type of bait is mainly fresh animal bait, mainly sea freshwater small fish and shrimp. In freshwater, there are meal strips, wheat ears, sand cress, juvenile white fish, small cockles, pony foals, fish-side fish skins, clams, small green shrimps, etc. Kinds of small fish. In the season of eating, the amount of bait is about 8% of the fish weight, and the highest ones are more than 10%. The off-season for eating is 3-4%. Feeding method adopts “slow, fast, slow†feeding effect, less feed wastage, most fish can stop feeding after running full. The weather is good or bad, the air pressure is high, the water quality is good, and the food intake of fish is very different. 3. Daily management: mainly do the following aspects. 1 patrol pond. Observe changes in fish feeding, activities, and water quality, whether there are signs of floating heads, or disease-free fish, and if any problems are found, they should be dealt with promptly. 2 change the water. Generally, one-third is changed every week, and 4/5 is replaced by half-monthly. The specific changes in water quality can be grasped flexibly. Where conditions permit, it is advisable to keep the micro-water aquaculture and the water temperature during the cultivation is not higher than 30°C. 3 prevent escape. The height of the pond from the water surface should generally be greater than 50 cm, and a strong anti-flood network should be installed at the water inlet and outlet. Third, the common occurrence of blackfish disease and prevention. 1. Saprophytic disease. Prevention and control methods should be as careful as possible in the operation of net transportation and stocking to prevent fish from being injured. Use 0.1PPM of malachite green or 0.5PPM of methyl blue for whole-tank disinfection. 10PPM of peacocks can be used when fish species become ill. Lime green or 3-5% concentration of saline solution dip. 2. Enteritis disease. In the prevention and control method, 34 g of furazolidone (Ferritin) was fed twice a day for 3 consecutive days in a 100 kg diet. 3. Myxosporidiosis. Control methods, with 0.2-0.5PPM concentration of 90% crystal trichlorfon treatment. Dongping County Animal Husbandry Bureau of Shandong Province Postcode: 271500 Excerpt from: 2007.11.16.03 version of "Science and Technology Information"
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