Super-intensive Shrimp culture technology in the greenhouse by Raceway technology

Raceway technology originated in South American countries (Mexico, Ecuador, Honduras, USA, Guatemala …), and has been thriving since 2008 when EMS / AHPND desease outbroke in these countries. This technology is widely used in shrimp farming, especially popular in white shrimp farming. The important goal of this technology is to help increase profitability on the same farrmin area in the same period of time thanks to its short rotation capability, maximize the white shrimps’ superior biological properties and increases the stock’s success.

According to the study of Dr. Tzachi Szwaja et al at the AgriLife Aquaculture Research Laboratory in Corpus Christi, Texas; The raceway system can produce more than 9 kg of white shrimp per cubic meter of water with a stocking density of 530 individuals / m3 of water. Average feed conversion ratio (FCR) is low, about 1-1.2; The weekly growth rate of shrimp is 1.3 g / week. In addition, this system reduces the cost of shrimp production from $ 5 per pound to about $ 2 per pound. Time to grow commercial products only takes 3 months, allowing production of 4 crops / tank / year. The closed culture system successfully suppresses the onset of the virus, and the death rate is kept below 0.5% per week.

This technology requires high technical management, especially the system’s dissolved oxygen (DO) level must be at its best. Since the water is not being replaced (only adding about 1% of total water daily to compensate for evaporated water), the raceway system contains dense biofloc granules containing bacteria and microalgae in a stale water environment. This is also an important source of food for the stock.

This is a system that requires large initial investment, high level of management and techniques to achieve the best results.

Super-intensive Shrimp culture technology in the greenhouse

Currently, greenhouse shrimp farming is widespread in the Mekong Delta due to disease control, environmental pollution and less risk than other models. Shrimp farming in the greenhouse, the initial investment costs are quite high. Total investment cost for 1 ha of about 10 billion VND, including building houses covering shrimp ponds, building walls around ponds, lining pond bottom, installing fan system, bottom oxygen, shrimp feeding system automatic, …

Thanks to the investment model is quite modern and closed so it is possible to stock intensive farming with high density. Average stocking density from 200 to 290 individuals / m2, shrimp 100- 105 days after harvest is harvestable, shrimp size from 30 to 33 children / kg, yield about 60-90 tons / ha. . Shrimp farming in the greenhouse has many advantages such as easy control of environmental factors (temperature), shrimps grow quite fast, especially the post-harvest and beautiful shrimp should be the shrimp processing companies The export price is higher than the market price.

Due to high stocking density, fan and bottom system must be operated 24/24 hours continuously. Accordingly, every 5 days to microbiological culture once and weekly to check the growth of shrimp to adjust the amount of food, water environment timely. What is especially important is that the greenhouse shrimp culture does not require water exchange, water can be used to stocking shrimp for the next crop. Consequently, people will be proactive in wastewater treatment in shrimp farming environment – a long-lasting issue without any remedial measures. In addition, in order to manage the pond environment for a period of 3-4 days, it is necessary to siphon the pond bottom once, cleaning the aquaculture environment to create clean products to meet the strict requirements of the export market.

In a nutshell, there are now many different types of technology; Each technology has different strengths, weaknesses and levels of investment. Depending on the practical conditions, farmers can consider and select the appropriate farming technology to achieve the highest economic efficiency.

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