ZHONGSHAN G.H.L. TRADING CO., LTD. , https://www.ghltrade.com
Pond management of annual production of two salmon
At present, there is a growing number of specialized households engaged in pond fish farming. However, the majority of them only manage to raise one batch of fish per year. To achieve the goal of producing 2,000 pounds of fish and 2,000 kilograms of adult fish annually, it's essential to focus on improving pond conditions, scientifically stocking fish species, and maintaining consistent pond management.
To begin with, ponds should be selected based on size—ideally between 5 to 10 acres—with sufficient water supply and no pollution. These ponds must be properly renovated before fish are introduced. The dikes need to be strong, drainage systems efficient, and irrigation facilities complete, ensuring that water levels can be adjusted as needed during different growth stages.
Before stocking, two types of fish should be thoroughly cleared from the pond. For the first batch, 150 kg of quicklime per acre is applied 10 days prior to introducing the first fish species. After 2–3 days, fresh water is added to a depth of 0.8–1 meter. For the second batch, 10 kg of bleaching powder per acre is used three days before the next season, with fresh water added on the second day.
The first fish species, such as carp, should be introduced by mid-March, with a balanced mix of food-eating and filter-feeding fish to maximize productivity. A typical stocking ratio per acre includes 1,200–1,500 fry of 150–250 g each, 200–250 of 250 g, and 80–100 of larger sizes. By June or July, the first batch reaches an average weight of 0.8–1 kg, allowing for harvesting over 1,000 kg per acre.
After the first batch is removed, the pond is refilled, and the second batch of fish, such as tilapia or pufferfish, is introduced by July 20th at the latest. Stocking ratios include over 1,500 fry of 25 g, 260 of 250 g, and 90 of 200–250 g per acre. These fish are raised until late October, with careful feeding and water level management. Water depth should gradually increase from 0.8–1 m in April to 1.5–2 m in June, with regular water changes and lime pulp applications.
Before adding the second fish species, the water level is maintained at 0.8–1 m and gradually increased, but not exceeding 1.5 m. Throughout the year, the water quality should remain "fat, tender, and cool," with a transparency of 25–30 cm and pH between 7 and 7.5. In late May, when temperatures rise, aerators must be used if fish start floating. One aerator is recommended for every 5 acres.
Morning aeration is done on cloudy days, while on sunny days, it should be turned on for 1–2 hours at noon. Each pond must have a feeding station extending 2–4 meters into the water. Fish feed should be fresh, non-moldy, uniform, and high in nutrition to promote growth.
Pond patrols should be conducted three times daily, with detailed logs kept to monitor fish behavior, feeding, and activity. Before introducing fish, they should be bathed in 1–2% saltwater for 5–10 minutes. In spring, 0.5–0.7 grams of trichlorfon per cubic meter is used to prevent parasitic diseases. Every half-month in June, the entire pond is treated with lime slurry. During disease outbreaks, bleaching powder or other medications are applied on clear days to prevent bacterial infections.
Next Article
Techniques for raising sterile fly
Prev Article
Pond management of annual production of two salmon