How healthy the pond with good liner?

Ponds constructed in soils containing iron pyrite (potential acid-sulfate or active acid-sulfate soils) will develop a low pH, which causes a problem for shrimp culture. Ponds built in sandy soil do not hold water very well. Organic soils do not allow stable embankments and have an elevated oxygen demand. Because of the low-lying land, shrimp ponds constructed in these areas face difficulties in drainage and drying after harvest. Pond bottoms do not completely dry out, and after culturing shrimp for a few crops, the pond bottom becomes deteriorated and this can stress shrimp and favor disease outbreaks.

Among several management schemes that can be used is the practice of separating the pond water and the soil by the use of plastic pond liners, which typically have achieved the best, cost-effective results in shrimp aquaculture. Plastic materials have been used for a long time in reservoirs, dams and ponds for agricultural purposes. But it is only in the last few years that this technology has been widely applied to aquaculture.

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Plastic materials suitable for lining shrimp ponds are HDPE (high density polyethylene) and poly vinyl chloride (PVC). As both HDPE and PVC incorporate anti-ultraviolet substances, these two materials can resist deterioration by UV light, which allows them to last for many years. These materials are flexible and come in rolls of sheeting that can be easily fused or glued together during installation. The recommended thickness for a shrimp pond liner is at least 0.75 mm, and many suppliers of HDPE and PVC liners guarantee their product use under normal conditions for five to 10 years.

Pond water quality is more easily managed because there are no negative effects on pond water quality from contact with bottom and dike soils. Liners effectively prevent soil-water interaction and prevent the issue of soil acidity, stop salinization of neighboring areas, and control seepage of water into the ponds in areas with a high water table.