Aquaculture

The aquaculture industry has experienced rapid growth in recent years, but traditional earthen pond farming faces problems such as leakage, water pollution, and frequent diseases. Geomembranes, as a highly effective anti-seepage material, are changing this situation. HDPE geomembranes, for example, not only effectively isolate harmful substances from the soil but also raise water temperatures and inhibit algae growth, making aquaculture management easier.

Leakage Prevention: HDPE geomembranes offer a permeability coefficient as low as 10⁻¹³ cm/s, saving 50% in construction costs compared to cement ponds and shortening the construction period by 70%.

Water Quality Protection: They block heavy metals and pesticide residues in the soil, reducing fish diseases (e.g., reducing the incidence of eel ulcers by 60%).

Temperature Control: The heat-absorbing properties of the black film stabilize water temperatures, accelerating the growth of species such as the yellow eel.

Easy Maintenance: The smooth surface facilitates cleaning of leftover bait and feces, reducing pond drying time from 15 days to 7.

Case 1: Shrimp Pond Anti-seepage Improvement

Problem: Rainwater seepage in a shrimp pond in a tropical region caused salinity fluctuations, resulting in a shrimp fry survival rate of only 50%.

Solution: Laying a 0.75mm HDPE geomembrane with double-track hot-melt welded seams (lap width ≥ 10cm).

Result: Improved water level stability, shortened the culture cycle to 90 days, and increased yield by 35%.

Case 2: Ecological Polyculture System

Design: A fish-lotus symbiotic pond utilizes a 0.35mm anti-seepage membrane. A 30cm layer of soil is placed above the membrane for lotus root cultivation, and a lower layer for loach cultivation.

Highlights: The membrane is highly tear-resistant (difficult to tear manually), eliminating the need for de-alkali disinfection of the lotus pond and preventing damage to the loach's belly.

Base Treatment: After removing sharp objects, lay a 150g/m² non-woven fabric protective layer to prevent punctures.

Slope Laying: Extend from the bottom of the pond to the top of the slope, allowing 1.5% slack to account for thermal expansion and contraction.

The use of geomembranes in aquaculture effectively addresses challenges such as leakage, water pollution, and frequent disease outbreaks in traditional earthen ponds. HDPE geomembranes, with their advantages of preventing leakage, protecting water quality, regulating temperature, and ease of maintenance, have demonstrated significant success in shrimp pond renovation and ecological polyculture, improving aquaculture efficiency while reducing costs and risks. With the increasing adoption of green aquaculture concepts, geomembranes will become a crucial material for promoting sustainable aquaculture development.