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Breeding techniques of carp fry
First, hatching ring (barrel) nursery. The loop is a specially designed body of water that mimics natural ecological conditions and keeps the eggs in constant motion. Using loops directly for raising fish fry provides an ideal environment for salmon fry to thrive. More importantly, this method helps maintain stable water quality and ensures a continuous supply of oxygen and nutrients.
When the carp seedlings start feeding, they are introduced to palatable bait fish—smaller live fish that have been removed from the film. This not only meets their nutritional needs but also helps keep the water clean by reducing waste buildup. Additionally, the movement of the loop helps prevent sediment accumulation, which can harm the fry.
During the seedling cultivation process, it's important to monitor the loop for issues like poor drainage and silt buildup. After 5 to 7 days of growth, on sunny mornings around 10 a.m., the loop should be rotated gently. Since the seedlings are very active and tend to eat greedily, it’s best to stop feeding the bait fish 12 hours before rotation. This ensures their stomachs are empty, reducing the risk of stress or loss during the process.
Second, net cage nursery. Net cages are an excellent choice for raising fish fry because they allow for a steady supply of fresh water and easy access to food. However, one drawback is that you cannot feed newly released fish immediately. Regular cleaning and cage replacement are necessary, making management more complex and time-consuming. Most cages use a three-stage nursery system: Class I boxes are made with 40 to 28 mesh polyethylene netting, measuring 4 to 6 meters long, 1 meter wide, and 1 meter deep. Class II boxes use 0.3 cm wide warp-knitted polypropylene mesh, sized at 2 meters by 1 meter by 1 meter. Class III boxes are slightly larger, using 0.5% larger mesh and also measuring 2m x 1m x 1m. The ratio of these cages is typically 1:10:20, ensuring efficient space utilization and proper growth stages.
Third, cement pool nursery. Cement pools are commonly used for fish breeding and are usually 4 meters by 6 meters with a depth of 0.8 meters, though sizes may vary slightly. It's crucial that the bottom has a slight slope to facilitate drainage. A small drainage pool should be located at the bottom, along with proper drainage systems. The drainage device is typically made of rubber hoses, filter mesh, and support wires. The hose is fixed in the center of the frame so it remains in place and maintains a consistent water level, regardless of how the pool is positioned. The drainage flow is controlled based on the number of drains and the height of the outlet.
Fourth, small earth pond breeding. When eels reach about 3 centimeters in length, they can be transferred to small ponds, with a stocking density of approximately 150,000 per hectare. Before introducing the eels, bait fish must be pre-cultured in the pond. Typically, bait fry are added 10 to 15 days before the eels are placed. The amount of bait fish is around 1,500 to 22.5 per hectare. Fresh water is added regularly each day, and care is taken to avoid overfeeding, which could lead to poor water quality.