In the fall, about 4 cm of green shrimp are purchased and then raised intensively in holding ponds for 3–4 months. These shrimp are then sold on New Year’s Day and the Spring Festival, where their price can more than double, resulting in a significant economic return.
The temporary holding area is typically between 2000–3000 square meters. The pond slope should be 1:2.5 to 3, with a water depth of 1.5–2 meters. The silt layer at the bottom must not exceed 10 cm. A shallow ditch is dug at the bottom, and a small shrimp pond measuring 5 meters long, 3 meters wide, and 0.5 meters deep is constructed near the outlet. Before stocking, the pond is dried thoroughly and exposed to sunlight for about a week until the bottom cracks. Ten days before introducing the shrimp, the water level is raised to around 30 cm, and 50–70 kg of quicklime per acre is spread across the entire pond. Aquatic plants are transplanted or shrimp nests are set up to provide shelter. Additionally, each acre of water requires an aerator of 0.5–1 kW, and one water pump is needed for every 2000–3000 square meters of water surface.
Shrimp selection should take place in mid-to-late September to ensure enough time for growth. Choose shrimp that are about 4 cm in size, with fully developed limbs, strong vitality, and no eggs. Soft-shell shrimp should be removed before stocking. Stocking density is approximately 70–100 kg per acre.
Feeding during the fall season is crucial for the second growth phase of the shrimp. Mainly use whole shrimp pellets with animal feed as a supplement. Pellet size should be 2–4 mm, with a crude protein content of 35%–40%. Animal feed should be crushed before feeding. Feed twice daily—once in the morning (8–9 am) and once in the afternoon (6–7 pm). Morning feeding accounts for about one-third of the total daily amount. The daily feeding rate is 3%–5% of the total shrimp weight in the pond (dry matter), or 10%–15% if using fresh feed. Adjustments should be made based on weather, water quality, temperature, and feeding behavior. Animal feed is mainly used in the morning, while pellet feed is used in the afternoon.
Water quality management is essential. Green shrimp require clear water with a transparency of 35–40 cm, dissolved oxygen above 5 mg/L, and a pH between 7 and 8. Fresh water should be added every 15–20 days, draining about 30 cm each time. From stocking until early October, transparency can be increased to over 40 cm to control algae growth. After autumn and winter, fertilization is applied to maintain a transparency of around 30 cm. Water levels should be adjusted according to the season, keeping the depth at 1–1.2 meters from September to October, and increasing it to about 1.5 meters after entering winter.
Oxygen deficiency is a major concern. If dissolved oxygen drops below 1.12 mg/L, shrimp may suffocate and die. Regular checks should be done in the morning and evening, and aerators should be turned on promptly. On sunny days, open them at noon; on cloudy mornings, open them early; and on rainy days, keep them running throughout the night. If signs of floating heads appear, water and oxygen should be added immediately, and chemical oxygen stimulators may be used if necessary. Autumn evenings with sudden thunderstorms are especially risky, so preventive measures should be taken in advance.
Disease prevention is critical during the holding period due to high stocking density, large feed amounts, and rapid changes in water quality. Key preventive measures include applying 15–20 kg of lime per acre every 15–20 days, and using terramycin at a rate of 1–2 g per cubic meter of water every 20 days. This helps prevent diseases such as white spot syndrome and red body disease in shrimp.
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