Every aquaculture pond liners’ initial role is to maintain the water in your pond. Meanwhile, manufacturers make the flexible liners usually called geomembranes by engineers, with various materials, each of the liners has pros and cons depending on the aquaculture ponds’ design, the aquaculture pond liners need to be temperature stable and keep good performance in the hottest and coldest weather your place is to meet, what’s more, it should not snag, puncture, or tear due to objects underground, fish farming ponds based on a large scale are usually exposed to the sun, which will need high and long-term UV resistance, chemical resistance, flexibility, cost, and toxicity to fish can all vary as well. Many aquaculture geomembranes are designed for large lakes or landfills or mining plants etc, and as a result, they may not perform as well in smaller backyard ponds. For these reasons, it pays to know a little about how to tell different liner materials before you invest in one.
Aquaculture Geomembranes Material Selection
HDPE Geomembranes for Aquaculture
HDPE geomembrane as a new material in the aquaculture industry has been more and more used, if you are doing fish, shrimp, or crab farming, then it is important to choose the right aquaculture geomembranes. HDPE geomembrane, also called fish pond liners, is designed for fish tanks and planting lotus root users. With the advantages of long service life, no pollution, easy to clean, and easy installation, aquaculture pond liners can replace the traditional farming ponds made with concrete or soil, it’s a popular choice for modern farmers.
LLDPE Geomembranes for Aquaculture
Suppose that the LLDPE geomembranes are made from the same plastic resins, it’s not hard to know that linear low-density polyethylene and HDPE aquaculture geomembrane liners are common in several things. These two liner types are almost the same inexpensive price, both of the pond liners need to be welded from different sheets in the field by some professional workers. The problem with these two materials is not easy to be custom fabricated in the factory with the heavyweight and poor flexibility. Similar to HDPE, LLDPE is also weldable, nontoxic to fish, and functions well in the regular pond water temperatures, no matter landfill to contain the waste or chemicals, or the artificial lake to hold the water for irrigation.
One major advantage of the LLDPE over the HDPE, is we need to know, is that since LLDPE is not as dense as the HDPE, thus makes the LLDPE softer, more flexible. LLDPE liners are much easier to install, also when mold around the corners and tight nooks and crannies. LLDPE’s flexibility means that the pond liner made by it can form fewer wrinkles in the laying and installation. Because it’s softer, LLDPE is also somewhat less prone to stress cracking than HDPE. Although the LLDPE softness comes at the price, meanwhile, in the tensile strength aspect, is it less tensile strength than HDPE liners, they can be more flexible when meeting the length-wise and tears on the land. Aquaculture geomembranes made from LLDPE are not quite as resistant to UV rays, aging time, and chemicals as those HDPE liners.
So, LLDPE liners may not be as durable when exposed to the sun and soil (when recommended as the pond liners, LLDPE liners may last up to 35 years).
Aquaculture Geomembranes Raw Material Selection
It is important to buy aquaculture geomembrane made by virgin new materials, meanwhile, in the market, there are too many factories using recycled granules to save the production cost. The sources of recycled materials can be waste machine oil drums, waste mineral water bottles, waste greenhouse films, beer bottles, and even medical waste. So, let’s see the disadvantages of them:
The pond liners can’t be used for a long time. 1 or 2 months, 2-4 years, which will lead to unnecessary costs and installation on issues when on a large scale farming.
Unstable quality. Release harmful items to the environment and the ponds.
Aquaculture geomembrane is usually UV and age resistant, if made by recycled materials, it can’t be used for a long time for outdoor usage. Then the anti-seepage function is lost.
Aquaculture Geomembranes Thickness Selection
There are different thickness aquaculture fish pond liners, usually from 0.3 mm to 1.0 mm, within this range, 0.5 mm and 0.75 mm are the most popular types. The aquaculture pond liners are made of 100% virgin materials, with UV resistance and aging resistance additives, they can last for 20-30 years exposed to the sun, if underground, they can even last for 30-50 years.
Aquaculture Geomembranes Color Selection
For aquaculture pond liners, black is the most used color. Since black is the most UV resistant then it can last for a long time. In the production, blue geomembrane or white colors geomembrane also can be customized as long as can reach the MOQ quantity.
Aquaculture Geomembranes Safety
When choosing aquaculture pond liners, the quality of pond liners produced by recycled resins is unstable, if it is used for some time since the liners contain a variety of harmful substances, thus will release unpredictable damaged items to both the environment and fry.
Aquaculture Geomembranes Price
The cost of aquaculture geomembranes is much lower than concrete also much healthier than natural soil ponds. The pond liners of HDPE cost approx 0.8 USD per square meter for the thickness of 0.75 mm, although the material rolls cost less, you still need to pay extra cost for the installation work. If you don’t have any experience, finding a team to do the welding and laying of the geomembranes will make the total cost not so competitive comparing some other lighter materials like PVC. So actually the aquaculture geomembranes will seem more cost-effective for large-scale ponds.
If you need to pay 1000 USD for a concrete fish pond, you may need to pay 200 USD for a geomembrane pond. The installation of the pond liners is easier for both small garden ponds and large-scale fish farms. Usually equipped with a team of 2-4 persons, a 4000 sqm of the fish pond could be finished in one day. So the geomembrane is the most cost-effective way to do in aquaculture.
Aquaculture Geomembranes Factory/Supplier
There are lots of manufacturers of fish pond liners around the world. If we are looking for a stable or qualified supplier, then CE and ISO certification are the basic important standard in the industry. Since different materials make the different costs of the finished liners. Even if national standards can’t reach the high requirements for engineering projects. Since some national standards accept the recycled resins in the production, as long as they are doing the production within the limitation.
Why Use Geomembranes For Aquaculture Instead Of Other Liners?
HDPE Aquaculture Geomembranes
High-density polyethylene (HDPE) is a stiff polymer, but it’s still flexible enough to use as a geomembrane. It’s tougher than PVC and much more tear-resistant, yet cold and freezing temperatures cause it to become brittle and crack. Most HDPE liners are somewhat fish or plant-safe, but not all offer this certification. All polyethylene-based liners, including HDPE, offer good UV and chemical resistance. HDPE is a better choice than PVC or EPDM.
LLDPE Aquaculture Geomembranes
Low-density polyethylene (LDPE) offers a lot of the same benefits as HDPE in a more flexible package. Unfortunately, that flexibility comes at the cost of some strength and tear resistance. Chemical resistance also varies in this range. While aquaculture systems don’t involve a lot of caustic or corrosive chemicals, the nutrients and byproducts in the water can still shorten the lifespan of these liners.
How The Use Of Geomembranes Can Benefit The Aquaculture Industry?
The impermeable aquaculture geomembranes can protect the slope of the pond and maintain the water capacity of the pond. At the same time, it can enhance the control of water quality and control the dissolved oxygen content. With quick and easy installation and laying of the geomembranes, the aquaculture pond liners can also reduce pumping costs and can prevent the escape of fish in the rainy season.
After using the anti-seepage aquaculture geomembranes for the fish pond, there will be no weeds at the bottom of the pond, and the salvage is quite fast, which can be fished. The fishing time will be reduced a lot, the vitality and freshness of fish and shrimp will be enhanced.
What’s more, the main function of the aquaculture fish pond liners is to avoid the direct contact of fish with the soil and water pollution from the land. It can prevent both waste accumulation in the soil and harmful substances such as entering the pond, which can reduce the risk of disease, protect and promote the growth of fish.
Thus you can see, in the aquaculture industry, the aquaculture pond liners place an important role in modern fish farming.
Which Is the Best Comparison Of Different Pond Liner Materials?
Then how to tell if the aquaculture pond liners are good or not.
1). From the surface, it is smooth and flat, the poorer the quality of recycled materials, the more bump dots it has on its surface.
2). The geomembrane of 100% virgin raw material doesn’t have any smell, but the recycled ones will smell pungent if you smell it. The worse the quality of the recycled material, the more pungent the smell. If it is impossible to judge that the geomembrane can be ignited with fire, the recycled geomembrane will emit a strong peculiar smell.
3). The density of HDPE aquaculture geomembrane is 0.94, so the 100% virgin raw material geomembrane will float on the water. Some recycled materials geomembrane’s density will be less than water, but geomembrane with very poor quality will sink to the bottom of the water.
4). The 100% aquaculture geomembrane will maintain its
toughness at -70℃. The geomembrane, which uses a lot part of recycled
materials, will harden after being frozen at low temperature and even become brittly broken.
5). The raw materials of recycled geomembrane is unstable, so the tensile
strength, break elongation and other indicators of recycled products cannot meet the standards and related requirements.
No aquaculture geomembranes liner material is perfect, but all the lists here clarify the advantages that could make them valuable additions to a variety of fish ponds, garden water ponds, artificial lakes, and irrigation ponds. When you are comparing liner materials from different factories, though the information you can get from the salespeople only the advantages, after reading this article, you will shop smart and more choose the correct liner material for your individual needs and circumstances!
Design, materials, and construction of aquaculture structures – whether inland or offshore -– play a major role in productivity and profitability. They contribute to the effort, maintenance, operational costs, and the ability of the operations to meet production goals.
Geosynthetics offer significant cost benefits and superior performance over the soil, clay- or concrete-lined ponds, supporting improved aquaculture management practices. Earthen ponds were used for fish and shrimp farms. Only when the available earth was not suitable, such as sandy or toxic soil, were liners installed. Yet, the advent of catastrophic diseases and the increase of large-scale farms have paved the way to greater use of HDPE liners.
If you have an aquaculture project under construction, fish pond or shrimp pond, or another aquaculture project. As a professional aquaculture geomembrane manufacturer and supplier, we can provide suggestions or solutions for your aquaculture project. If you have any questions, you can contact us.