1. Seed Cultivation
1) The ideal area for fish fry ponds is 2 to 3 mu. It is recommended to clear and detoxify the pond 8 to 10 days before introducing heterotrophic silver carp fry into the lower pond. Properly fertilized water ensures that the fry have enough food to eat once they are transferred.
Fish fry rely on their yolk sacs for nutrition in the first few days after hatching. By day three, the yolk sac disappears, and the fry begin to swim and feed. At this stage, it's time to start feeding them with egg yolk. After a few days of feeding, the fry become more active and capable of eating, and the pond can be fully cultivated. Since the fish organs are still developing, careful management is essential during this period to maintain good water quality and sufficient food supply, which is crucial for healthy fry growth.
The breeding method for allogynogenetic crucian carp is similar to that of common carp. A density of 100,000 to 150,000 fry per acre is ideal. For the first few days, feed them soy milk twice daily, using 3 to 4 kg of soybeans per acre per day. Adjust the feeding based on water color and fry development. After 15 days, the silver crucian carp grow to 1.6-2.5 cm, at which point they can be moved to fingerling pools. If larger fish (over 6.6 cm) are desired, summer fish should be separated, typically reared at a density of 20,000 to 30,000 per acre, reaching the desired size within 20 to 30 days.
2) Paddy Field Cultivation: Raising fish fry in paddy fields is an efficient way to save on pond space and feed costs. Each mu of rice field can support about 50,000 silver carp fry, which can grow to 1.6-2.5 cm within 20-25 days. If you continue growing rice, you can introduce 1,000 to 1,500 summer fish per acre to further raise large-sized heterotrophic silver carp to 6.6 cm or more.
2. Adult Fish Culture
In adult fish culture, ponds are the most economical option. These ponds can be divided into breeding pools and adult fish ponds.
1) In fingerling pools, place 80-120 fish per acre, each measuring 5-7 cm. No additional feeding or special management is usually required. After five months of rearing, the average weight can exceed 250 grams, resulting in 20-25 kg of adult fish per acre.
2) Adult fish ponds can be categorized into two types: one where main species like flower scorpions, white bream, and squid are raised alongside smaller fish such as silver oysters; the other where the main species are bred without smaller ones. Both methods are effective.
3) In paddy fields, the stocking density of crucian carp depends on water depth and available feed. Normally, around 1,000 fish per mu can be raised, yielding up to 40-50 kg per mu.
4) Ditch farming involves closed or semi-closed large water bodies, offering high survival rates and rich bait resources. Stocking density varies depending on the size of the area and water availability. Typically, 50-300 summer fish per mu can be stocked, growing to an average of 200-400 grams by year-end.
5) Lakes are also suitable for stocking and raising fish. Stocking density varies greatly depending on the lake’s ecosystem. In small lakes with few ground fish, 40-50 fish per 100 liters (6.6 cm or larger) can be stocked.
6) Cage culture is easy to manage and highly productive. Silver carp cages are stocked at 100-500 per square meter (around 6.6 cm). After 7 months of feeding, the maximum weight can reach 0.75 kg, with an average of over 350 g. Cages can produce 7.2 kg of fish per square meter, with a feed conversion ratio of 1.2-1.4.
7) Fish-breeding mixed systems, such as those involving river eels, allow for dual production. Raising heterotrophic silver carp alongside river eels does not affect eel growth or pearl yield, while generating additional income from commercially viable fish. Usually, 500-600 mu are stocked with 500-600 bait fish. After 5-6 months, the average yield per mu reaches about 250 kg.
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