How to Polyculture Fish Fry in Adult Fish Ponds? Master These Technical Points

How to polyculture fish fry in adult fish ponds? Polyculturing summer fry in adult fish ponds can both improve the utilization rate of the water environment and provide large-sized high-quality fry for the next round of adult fish farming. However, there are many points to note when polyculturing fry in adult fish ponds, and only by doing them well can the polyculture succeed.

1. When stocking adult fish fingerlings (fry), leave room for the subsequent polyculture of fry

If you need to use an adult fish pond for polyculturing summer fry, pay attention when stocking adult fish fingerlings (fry) in the earlier stage that the future fish carrying capacity must not reach the limit. Leave room in the fish carrying capacity for the polycultured fingerlings (fry), otherwise it will affect the growth of the fry, and an excessively large pond fish carrying capacity is also very dangerous.

2. Strive for uniform size in polycultured summer fry

In order for the polycultured fingerlings (fry) in the adult fish pond to reach the required size, they can be stocked appropriately earlier, and the summer fry stocked should be neat and uniform in size. In this way the fry have a long growth period and grow to a large size, and both size and physique can be consistent and robust.

3. Accurately grasp the stocking quantity of polycultured fry

The size of polycultured fry at pond harvest has a certain relationship with stocking time, fry quality and feeding management, but it is even more closely related to stocking density. Under conditions where stocking time and fry size are determined, the size achieved depends on stocking density. Therefore a reasonable stocking density should be determined according to technical conditions, management level and so on. Generally, 300-500 one-inch fry (over 3 cm) are polycultured per mu, depending on the species.

4. Strengthen feeding management

Pond fish vary in individual size, so when polyculturing, attention should be paid to doing a good job in the feeding management of both adult fish and fry. Adhere to the feeding principles of fixed time, fixed location, fixed quality and fixed quantity, flexibly control the feeding amount according to specific conditions, fertilize according to the water to cultivate palatable natural food for the fry, and at the same time pay attention to pond patrols, water quality management, disease prevention and so on.

5. Pay attention to species combination

When polyculturing summer fingerlings (fry) in adult fish ponds, fry with the same or similar feeding habits should as far as possible not be stocked in the same pond. When polyculturing silver carp and bighead carp fry, the combination ratio is 4-5:1, and in carp ponds it is best not to stock crucian carp fry or to stock few of them. The species structure and quantity of stocked fry cannot be mechanically copied exactly according to the structure and quantity required for adult fish farming.

6. Harvest adult fish from the pond in good time

When fry are polycultured in an adult fish pond, the pond fish carrying capacity will gradually increase as time goes on, and sudden weather changes in the high-temperature season often easily cause pond-wide fish kills. After August, adult fish successively reach market size, so the adult fish should be harvested and sold in good time. This can both ease the contradiction of a large pond fish carrying capacity and avoid accidents, and also win time and space for fry growth and improve the quality of the fingerlings (fry).

Polyculturing fry in adult fish ponds is not difficult. As long as the management work is done well, it can greatly reduce farming costs, save funds, and bring greater profit margins to aquaculture.