The Application of Geomembranes Liner in Fish Farming Ponds-N

I. Introduction

   Traditional fish farming ponds often encounter problems such as water leakage, unstable water quality, high maintenance costs, and frequent fish diseases, all of which hinder the sustainable development of aquaculture. However, geomembrane (synthetic membrane) lining effectively addresses these issues with its outstanding physical and chemical properties, and has become an indispensable part of modern intensive and commercial fish farming.

II. Overview of Geomembrane Liner for Fish Farming Ponds

    Geomembrane liner for fish farming ponds is a kind of impermeable geosynthetic material made of high-quality polymer materials, mainly including HDPE (High-Density Polyethylene), LDPE (Low-Density Polyethylene) and other types. Among them, HDPE geomembrane is the most widely used due to its excellent comprehensive performance. It is non-toxic, eco-friendly, corrosion-resistant and easy to install, which can form a complete impermeable barrier between the pond water and the soil, effectively preventing water seepage and isolating soil pollutants. The application of geomembrane liner not only improves the utilization rate of water resources but also creates a stable and safe living environment for fish, laying a solid foundation for high-yield and high-quality aquaculture.

III. Performance Parameters of Geomembrane Liner for Fish Farming Ponds

IV. Selection Criteria for Geotextile Liners for Fish Pond Cultivation

When choosing a geotextile liner, it is necessary to consider the actual conditions of the fish pond, such as its size, depth, soil quality, the type of fish being raised, and the local climate. This ensures that the selected liner is both suitable, economical, and durable. 

Firstly, regarding material selection: priority should be given to using aquatic-grade HDPE geotextiles made entirely of 100% pure resin, avoiding the use of cheap products that contain a large amount of recycled components and are prone to brittleness and fragility.

Secondly, regarding thickness selection: for shallow ponds (with a depth less than 1.2 meters), a 0.5 - 0.8 millimeter thick liner can be used; while for deep ponds or large-scale breeding ponds, a 1.0 - 2.0 millimeter thick liner should be selected to enhance the puncture resistance. 

Third, performance first: Opt for products that possess excellent waterproof properties, UV resistance, and non-toxicity. These products meet the standards for aquatic farming environments. 

Finally, cost control: Balance performance and cost, and avoid overemphasizing high performance which leads to unnecessary waste.

V. Installation Process of Geomembrane Liner in Fish ponds

Proper installation of the geotextile membrane liner is crucial for ensuring its seepage prevention effect.

During the preparatory stage, thoroughly clean the bottom and slope of the pond, remove sharp objects such as stones and tree roots, level uneven areas and compact the soil to prevent the liner from being punctured. At the same time, unfold the geotextile membrane and allow it to adapt to the on-site temperature to reduce stress caused by thermal expansion and contraction. 

During the on-site installation stage, the padding was laid in the order of "first the bottom, then the slope surface", with a 1.5% allowance for ground settlement. The padding was then joined together using hot wedges, ensuring that the welding width was no less than 10 centimeters and the welding strength met the standards. 

During the post-installation inspection stage, a watertightness test is conducted: water is added to the pond and observed for 24 to 48 hours. If there is no significant drop in water level, the installation is considered； otherwise, the leakage points should be promptly identified and repaired.

VI. Application Effect of Geomembrane Liner in Fish Pond Cultivation 

Firstly, regarding water resource conservation: This excellent waterproofing performance can reduce water leakage loss by over 90%, thereby saving a large amount of water resources and lowering water supply costs.

Secondly, water quality stability measures: It separates pond water from the soil, preventing harmful substances (such as heavy metals and pesticides) in the soil from seeping into the water, stabilizing the pH value and reducing fish diseases. This can reduce the incidence of fish ulcers by 60%.

Thirdly, cost reduction: The pond dredging cycle has been shortened from 15 days to 7 days, reducing labor and maintenance costs, and the cost can be recovered within 1 to 3 farming cycles.

Fourthly, efficiency improvement: The surface of the liner is smooth, facilitating fishing and cleaning, increasing fishing efficiency by 50%, and also stabilizing water temperature, thereby shortening the breeding cycle and increasing yield by 35% or more.

VI. Conclusions and Prospects

Geomembrane liners have become an important material that drives the modernization of the aquaculture industry due to their outstanding performance and significant application effects. They effectively solve the problems such as water leakage, unstable water quality, and high maintenance costs that exist in traditional fish ponds, improving the efficiency and economic benefits of aquaculture, and conforming to the concepts of green and sustainable aquaculture.

With the continuous advancement of aquaculture technology and the increasing demand for environmentally friendly aquaculture, the performance of geotextile membrane liners will be further enhanced, and their application scope will also become more extensive. In the future, geotextile membrane liners will be combined with intelligent aquaculture technology to better serve the high-quality development of the aquaculture industry and provide more powerful support for global food security.