The net house model helps shrimp grow steadily.
Shrimp farming has long been a strength of coastal localities in Nghe An province. However, in the summer, high temperatures and solar radiation cause sudden changes in the water environment of shrimp ponds, leading to thermal shock, increasing the risk of disease and economic losses. Many farmers have had to abandon their crops or face heavy losses.
To overcome this, many shrimp farmers in Nghe An have boldly switched to the model of shrimp farming in net houses - a solution that can regulate temperature, limit the adverse effects of weather, and protect farmed shrimp from the nursery stage to the time of sale.
A prime example is the model of Mr. Nguyen Cuong in Hamlet 9, An Chau Commune (formerly Dien Chau District). With a total area of 3 hectares of water surface for shrimp farming, he invested in building a net house system covering more than 1 hectare of ponds for initial shrimp farming. This system includes a sturdy steel frame, UV-resistant polyethylene netting, and a waterproof bottom liner, ensuring a stable living environment for the shrimp.
According to Mr. Cuong, using shade nets helps reduce the water temperature in the pond by 3-4 degrees Celsius compared to outdoor ponds, while also limiting the growth of algae and harmful microorganisms. Shrimp grow faster, are less prone to disease, shorten the farming time, and increase the number of farming cycles to 3-4 cycles per year instead of 1-2 cycles as before.
Although the initial investment cost for the greenhouse system is considerable, at hundreds of millions of VND per hectare, the economic benefits are very clear. Each year, Mr. Cuong sells 4-5 batches of shrimp, with much higher and more stable yields compared to traditional farming.
“The ideal water temperature for shrimp farming is around 30 degrees Celsius, so ponds are equipped with water fans and aeration systems to maintain oxygen levels. Combined with regularly measuring water temperature, farmers can easily adjust the water temperature and quality to suit the shrimp's growth. When water temperature is well controlled, shrimp grow faster, stress is reduced, and disease outbreaks are minimized. Commercial shrimp achieve uniform size, beautiful color, and higher quality. Net houses not only provide protection from the summer sun but also retain warmth in the winter, creating conditions for year-round shrimp farming. While highly effective, the investment requirements remain a barrier for many small-scale shrimp farmers,” Mr. Cuong shared.
Mr. Cuong also stated that for outdoor ponds, it is essential to always provide sufficient water, ensuring a depth of 1.2-1.4m, and to increase the use of aeration fans to cool the ponds, prevent temperature stratification, and provide oxygen for the shrimp.
Not only Mr. Cuong's family, but in Nghe An province, there are currently 105 establishments applying high-tech shrimp farming models with a total area of over 202 hectares, including 51 establishments farming in floating cages and net houses, achieving a yield of 15-20 tons/hectare/season.
According to Mr. Le Van Huong, Deputy Head of the Fisheries and Fisheries Inspection Department of the province, investing in shrimp farming in net houses is an inevitable trend for shrimp farmers to adapt to climate change.
Observations show that shrimp farming net houses are designed relatively simply, consisting of a sturdy steel or aluminum frame, and a sunshade net capable of filtering 30-50% of sunlight, minimizing the impact of radiation. The net system is anchored with cables to withstand strong winds and storms.
Changing mindsets for sustainable aquaculture development.
The model of shrimp farming in net houses is not only a technological breakthrough but also a shift in the production mindset of the people. Instead of relying entirely on nature, farmers proactively create an optimal farming environment, minimizing risks and aiming for long-term efficiency.
This direction is also consistent with Nghe An province's sustainable aquaculture development strategy in the coming period. Authorities at all levels are actively supporting people in accessing preferential loans, transferring technology, and expanding the greenhouse model in localities with suitable conditions.
In the context of increasingly complex climate change, innovative models such as shrimp farming in net houses not only help people "live with the weather" but also enhance product value and contribute to protecting the ecological environment.
Shrimp farming in net houses has been adopted by farmers in Nghe An province for many years, proving its effectiveness and attracting attention from many coastal localities in the province, which are gradually adopting it. With comprehensive support from the government, this model is spreading more widely, changing the landscape of coastal shrimp farming and creating a stable, safe, and sustainable production value chain.
Source: https://baonghean.vn/dau-tu-nha-luoi-nguoi-nuoi-tom-nghe-an-thich-ung-voi-thoi-tiet-nang-nong-10302239.html
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