Stocking methods and matters needing attention of crayfish

There is a lot of preparation work before releasing crayfish, crayfish can not be raised by stocking, its breeding also has certain techniques and skills, and only by mastering these techniques and skills can its benefits be maximized.

Preparation of crayfish before stocking

1. The condition and preparation of rice field. The area of rice fields should be large, ranging from tens of mu to hundreds of mu. The ridge of the field is high and can hold a water depth of 50 to 80 centimeters. A trench with a width of 1 to 1.5 meters and a depth of 0.8 meters is excavated along the ridges of the fields with a larger area, and a "ten" or "well" shaped trench is also excavated in the middle, with a width of 0.5 meters and a depth of 0.5 meters. Ten to 15 days before shrimp release, 50kg quicklime per mu of rice field ditch was used, or other drugs were selected to thoroughly clear the ditch and disinfect the ditch to kill wild fish, enemy organisms and pathogenic bacteria.

2. Apply sufficient base fertilizer. 7-10 days before shrimp release, 50-80 cm of water was injected into the field ditch, and then fertilized to cultivate food organisms. Generally, 50 kg of compound fertilizer and 50 kg of ammonium bicarbonate are applied per mu; the fertilizer effect of farm manure is slow and long, and it has no effect on the growth of crayfish, and it can also reduce the frequency and quantity of chemical fertilizer applied in the future. Therefore, it is best to apply farm manure with farm manure 1000 kg per mu.

3. Transplant aquatic plants. Submerged aquatic plants such as verticillium verticillata and goldfish algae are planted in the shrimp ditch, or water spinach and water hyacinth are planted on the edge of the ditch. But to control the area of aquatic plants, generally accounting for 10%-20% of the shrimp ditch area, sporadic distribution is better, do not gather together, this is conducive to the smooth flow of water in the shrimp ditch.

4. Filtering and escape prevention. Anti-escape and filtration facilities such as bamboo foil, barbed wire and mesh should be installed at the inlet and outlet to strictly prevent the entry of enemy creatures.

Stocking methods of crayfish

When stocking crayfish seedlings or shrimp species, try the water. Only after the water test is safe can you release the crayfish. There are several ways to release crayfish:

First, in the first ten days of September after the rice harvest, the species of crayfish are put directly in the rice field and allowed to reproduce on their own. according to the actual situation of rice field culture, generally 20 kilograms of crayfish with more than 40 grams per mu are released, with a female-to-male ratio of 3:1 or 7:2. The no-tillage method was used to plant rice in the next season.

Second, after rice seedlings were planted in May, the larval crayfish were put in 2cm and 4cm, and the quantity was 5000cm / mu. Crayfish in stocking, we should pay attention to the quality of young shrimp, the same field stocking specifications should be as neat as possible, full release at one time.