Blackfish is a valuable freshwater fish with high economic value and is known as "treasures in fish." It is very nutritious and contains a lot of protein, which is higher than the protein contained in chicken and beef. From the perspective of nutrition, blackfish is a kind of advanced health food with comprehensive nutrition and delicious meat. Black fish adult fish farming refers to the production process of raising fish species into small fish ponds, ponds, and cages. Artificially farmed blackfish have extensive polyculture and intensive monoculture. Extensive polyculture refers to the polyculture with four kinds of home fish in the fishing pond. Intensive monoculture is the use of abundant sources of water, adequate feed conditions for high-density single-cultivation, sub-cage single-culture and pond single-cultivation, in recent years mainly to adopt high-density single-maintenance ponds. The following is a brief description and is for reference only. Prepare before breeding 1. Breeding facilities: soil ponds, concrete pools, etc. The water depth is 1 meter to 2 meters. Drainage equipment is complete. 2. Water quality: No pollution is required, and the water quality should be neutral or slightly alkaline. 3. Area: The area of ​​the fishing pond should be smaller, preferably about 1 mu, and the maximum should not exceed 2 mu. 4. There must be a fence of 40 cm to 60 cm around the pool to prevent escape. 5. Plant aquatic plants on the surface of the pool, generally not more than about 20%, which is suitable for sheltering sunlight, summer heat, and predation, while purifying water and regulating water temperature. Breeding technology 1. Stocking of fish species: 1) When the fish species is selected from 10 cm or more in the current year, the fish species should be of the same specifications and be free from injury and illness. 2 It is best to choose locally produced fish species. 3 The stocking time is better from early September to early October. The fish can take a restorative constitution and increase the survival rate of overwintering. Years of stocking are from March to April. 4 disinfection: strict disinfection before the next pond. 5 Stocking Density: Water depth is 1.2m~1.5m, 50g~60g fish species are put into 8000~9000 pigs per mu, 80g~100g fish species are put in 5000~6000 tails per mu. 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. This makes it easier to form a feeding situation, increase food intake, and reduce food waste. The types of bait are mainly fresh aquatic animals, mainly sea freshwater fish and shrimps. When food is flourishing, the amount of fish bait is about 8% of the fish weight, and the highest ones are more than 10%. The low season for eating is 3%~4%. When feeding, the “slow, fast, and slow†method is adopted, the feeding effect is good, and the feed is wasted. Most of the fish can stop feeding after they eat. When the weather, air pressure and water quality are different, the food intake of fish is very different. 3. Day-to-day 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. Black fish intake high-protein foods every day, the concentration of ammonia in the pool water is high, especially in summer when the water temperature is high, the water body is very easy to deteriorate. For this reason, it is necessary to replace the water body in time. Generally, it is changed 1/3 a week, and 4/5 is replaced in half a month. Where conditions permit, it is advisable to maintain microfluidic aquaculture, and the water temperature during the cultivation should not exceed 30°C. 3 prevent escape. As the blackfish gradually grows, the ability to jump increases, especially when changing the water in the rain or jumping early in the morning, so the height of the pool from the water surface should generally be greater than 50 cm, and a strong anti-flood network should be installed at the entrance and exit of the pool. Prevent escape or prevent escape. Disease and Prevention 1. Saprophytic disease. Prevention and control methods should be carefully handled during transport and stocking operations to prevent fish injuries. When fish species occur, they can be soaked with 3%~5% concentration of salt solution. 2. Myxosporidiosis. Control methods were treated with 0.2-0.5 ppm concentrations of 90% trichlorfon.
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