The pond must have sufficient water, good water quality, and efficient drainage. The area is typically 3 to 5 mu (about 0.2 to 0.3 hectares). The pond should have a slight slope to ensure proper water flow. To prevent crayfish from escaping, the pond's width should be more than 1.5 meters, with a 0.5-meter-high smooth wall or escape board around the edges. In the center of the pond, a small loach (a type of structure) is built to create caves for the crayfish. It’s important that this loach is not connected to the main pond. The loach should be about 4/5 the length of the pond, at least 1 meter wide, and 5 to 10 centimeters above the water level. The pond depth should range between 0.8 to 1.5 meters, with shallow areas surrounding the deeper middle part. At the bottom, roots, bamboo tubes, and similar structures are placed to provide shelter. Before stocking, the pond should be thoroughly sterilized using 300 to 500 kg of cooked manure per acre. Aquatic plants such as Vallisneria, Hydrilla, Eichhornia, Water Lilies, and Water Peanuts should cover about 30% of the pond area to offer hiding spots and reduce stress during molting.
Juvenile shrimp are stocked in three main ways. First, summer stocking involves placing the first batch of hatchlings in mid-July, with a density of 30,000 to 40,000 juvenile shrimp per acre for those measuring 0.8 cm. Second, fall stocking occurs between mid-August and September, where larger shrimp, either 1.2 cm in size (25,000 to 30,000 per acre) or 2.5 to 3 cm (15,000 to 20,000 per acre), are introduced. Third, winter and spring stocking takes place in December or March to April, involving shrimp that didn’t meet market standards earlier. These are stocked at 100 to 200 per kilogram, with 15,000 to 20,000 per acre. After two growing seasons, they are ready for sale between June and July.
When stocking, it's crucial to select healthy juveniles with strong bodies, complete limbs, no injuries or diseases, and high activity levels. All shrimp in the same pond should be of similar size. Before introducing them, place the shrimp in a plastic basin and gradually add water until the temperature matches the pond. Add 3–4% saltwater for disinfection for 5 minutes, then slowly release the shrimp along the edge of the pond. Avoid exposing them to air for long periods. If shrimp have been out of water for too long and appear sluggish, keep them in the basin for 20 minutes before restocking.
Feeding can include minced fish, snail meat, silkworm pupae, clams, slaughterhouse scraps, rice bran, soybean cake, bran, pumpkin, hawthorn, and fresh water grass. Commercial shrimp feed can also be used, but it should have a crude protein content of over 25%.
From July to October, when temperatures are ideal, this is the peak growth period. During this time, feed the shrimp fully, ensuring all food is consumed without leftovers. Animal-based feed should account for 8–12% of their body weight, while compound feed should be 3–5%. Feed twice daily—more at night (60–70%) and less during the day. In other seasons, feed once a day, before and after sunset, at 2–5% of their body weight. Crayfish are poor swimmers and tend to stay in one area, so feeding must be consistent in timing, location, quality, and quantity. Adjust feeding based on weather: more on sunny days, less during hot or rainy weather, and when water quality is poor. Increase feeding when crabs are molting.
Daily management includes regular pond inspections to detect issues early. One week after stocking, apply 50–60 kg of cooked manure per acre, and 15–20 kg of fermented manure per mu later in the season. Maintain green or brown water with a transparency of about 35 cm. Change water every 5–7 days in summer, and every 15–20 days otherwise, replacing 20–30% each time. Keep the pH between 7 and 9, and dissolved oxygen above 4 mg/L. Regularly disinfect and improve water quality by sprinkling lime (10–15 kg per acre) for 15 days. Apply 0.5–0.6 g per cubic meter of Quanchipia monthly. In the middle and late stages, add 5–6 g of photosynthetic bacteria and 40–60 g of sediment enhancer per square meter to maintain a healthy aquatic environment.
Drawer Safe,Lock Safe,Anti Theft Safe,Portable Cash Safe Money Box
Ningbo Reliance Security Technology CO.,Ltd , https://www.reliancesafes.com