Sewage fish caught six points
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July 18 13:41:22, 2025
Every day, a significant volume of domestic wastewater flows into urban drainage systems. This wastewater is rich in organic matter and nutrients, making it a valuable resource for aquaculture. In suburban areas, fish ponds often utilize this sewage to raise fish, which not only reduces the need for fertilizers, feed, and labor but also helps purify the water and improve the local environment.
Ponds used for fish farming with sewage should generally be large, ideally around 6,670 square meters. This size allows for better water circulation and ensures that the pond's natural purification capacity can handle the load. The water depth should be between 2 to 3 meters, and the pond should be oriented east-west with slightly oval ends to prevent stagnant "dead zones." Inlet and outlet pipes are equipped with elliptical bends to enhance water flow. The bottom of the pond should have a slight slope of about 5%, which aids in removing debris and makes fishing more efficient. Two to three inlet and outlet pipes are typically installed at opposite ends to avoid dead spots, ensuring smooth water movement and effective purification. The inlet pipe should be positioned above the water surface to create a strong flow, improving oxygenation. Additionally, water intake valves and gates are placed before the inlet to regulate the timing and volume of wastewater entering the pond.
The main species stocked in these ponds are scalefish, making up 80% to 90% of the population. Other species such as tilapia, grass carp, and silver carp account for the remaining 10% to 20%. Stocking density ranges from 1,000 to 1,500 fish per 667 square meters.
Managing wastewater aquaculture involves careful control over the amount and quality of sewage introduced. Key practices include understanding the source and characteristics of the wastewater, avoiding toxic industrial effluents, and using open channels to allow oxygenation and sedimentation. Alternating inlet and outlet pipes improves water flow. A settling tank is recommended to reduce toxicity before the wastewater enters the pond. Some farms use a "Dianchi Lake" system to achieve dual benefits of settling and purification. The amount of sewage added at one time should not exceed 3% of the pond’s total volume, and water clarity should be maintained between 20 to 35 cm. Feeding areas should be located away from the sewage outlet to prevent fish poisoning. Aerators are used to speed up the breakdown of organic matter, promote plankton growth, and maintain healthy fish populations by preventing them from floating to the surface.