CATDOLL : CATDOLL: How to improve the high-yield breeding of crucian carp

1. Pond conditions

Crucian carp like to gather in groups, dive into the mud and jump against the current to escape. The main crucian carp pond area should be too large, usually about 2 mu, preferably more than 4 mu; the pond bottom should be hard, usually the mud thickness is within 10 cm, and the silt must be cleared when it exceeds 10 cm to facilitate the fishing of crucian carp; the pond bank should be solid, and the water inlet and outlet should be firmly installed with fish fences. The fish fence should be 50 cm higher than the high water level of the pond.

2. Variety selection

There are many varieties of crucian carp on the market, so it is inevitable that there will be good and bad. Practice has proved that heterogeneous silver crucian carp and high-back heterogeneous silver crucian carp (abbreviated as high-back crucian carp) are suitable for main breeding. Their growth rates are 2 times and 3 times faster than ordinary crucian carp respectively. The heterogeneous silver crucian carp and high-back crucian carp are similar. The difference between heterogeneous silver crucian carp and ordinary crucian carp: heterogeneous silver crucian carp has 31-32 lateral line scales, while ordinary crucian carp has 28-29; heterogeneous silver crucian carp and high-back crucian carp have the same number of lateral line scales. High-back crucian carp has a short head, a high back, a thick body, and a round abdomen.

3. Stocking density

From the perspective of aquaculture economic benefits, if the stocking quantity exceeds 2,000 per mu, a higher yield can be obtained, the commercial fish body is small, the selling price is low, and the benefits are ideal; if the stocking quantity is less than 1,000 per mu, although the commercial fish body is large, the total yield is high and the sales income is low, 1,400 fish of 30 grams or 1,200 fish of 50 grams can be stocked per mu, with appropriate amounts of silver carp, bighead carp and summer flower grass carp. The total number of fish buried is more than 600, and the net yield is more than 500 kg of crucian carp, and about 200 kg of other carp. The benefits are ideal.

4. Water Quality Management

The calcium and phosphorus content in crucian carp is more than twice that of other fish, so it requires water rich in calcium and phosphorus to meet the physiological needs of crucian carp. Apply quicklime solution once every 20 days, with a dosage of 60 kg per mu each time; apply superphosphate once every 15 days, with a dosage of 15-20 kg per mu each time. Apply quicklime 3-5 days before applying superphosphate to prevent excessive alkalinity of the water body, which will reduce the effect of phosphate fertilizer.