Do you still remember the recirculating water breeding of leather shrimp mentioned by Xiao Cat last year?
Recently, there has been new good news from this Vietnamese farm that uses recycled water technology to breed pipi shrimp!
According to the latest news released by Le Ngoc Hanh, master of the Second Institute of Aquaculture in Vietnam, after a year of breeding experiments last year, the breeding research of "breeding mantis shrimp in a circulating system in plastic containers" has achieved a survival rate of 93%-98%, and the weight will reach 150-170 grams after 3 months from the initial 80-100 grams.
"Understanding the economic value of this type of shrimp, as well as the actual needs of consumers, the Second Institute of Aquaculture has initially succeeded in developing the indoor Rar shrimp farming model, which is highly efficient and economical," Le NGOC Hanh emphasized. ”
This research on the "recirculating system for the cultivation of mantis shrimp in plastic containers" is the technical route of the Harpiosquilla Harpax (de Haan, 1844) that uses a factory recirculating water system (RAS) to raise skin shrimp in plastic containers.
The factory recirculating aquaculture system (RAS) is a kind of purification, temperature control, oxygenation and sterilization and disinfection and other subsystems, through a complete circulating water treatment equipment, on the one hand, it can filter out organic matter in water quality, and fully reflect the harmful ammonia nitrogen, nitrite and various trace elements in the water. On the other hand, it can also reduce the dependence on large-scale breeding sites, reduce the restrictions of natural resources such as land and water, and realize cross-regional and cross-seasonal environmentally friendly farming.
Specifically, in the shrimp breeding system, it is mainly composed of a breeding tank system, a mechanical filtration device, an ultraviolet sterilization device, a CO2 emission reduction device, a dissolved oxygen addition device, a biological filtration device and a monitoring system.
The breeding area adopts a closed type, strictly controls the environment of the indoor water tank, and the breeding area adopts a closed, box system with a partition, which is based on the simulation of the survival environment of the shrimp in nature, each box only accommodates one shrimp, so as to reduce cannibalism, so the number can be easily monitored and controlled.
In addition to the design of the breeding area, the system introduces the wastewater from the aquaculture system into the mechanical filtration system including the microfilter and protein skimmer to filter out the solid organic matter in the water body in the treatment of the aquaculture pond water. Subsequently, it is introduced into the biochemical filter tank to remove ammonia nitrogen, nitrite and other dissolved inorganic substances in the water quality.
Subsequently, the water that has been filtered through two stages is then fed into the ultraviolet disinfection system, and then re-supplied to the culture tank after increasing the oxygen content of the water through the mixing tank. The temperature in the system is adjusted by means of a heating tank to ensure that the water temperature is stable. The treated water is pumped (10 m³ h capacity)** to the culture tank.
Le Ngoc Hanh said the total water consumption of the farming system is 123 cubic meters, of which 4 are filtered by the system6 cubic meters (377%), 6 cubic meters of incubator (50%), and the rest are pure water pipelines. The circulating flow rate of each tank (6 liters of water) is adjusted to 003 cubic meters per hour, which is equivalent to the water exchange rate of 5 hours of the tank. Generally, the circulating water flow of the whole system reaches 720 cubic meters per day. The RAS system uses a compressed air blower system with a flow rate of 250 litre-minutes, generating 360 cubic meters of air flow per day.
At present, the Le NGOC Hanh team has signed installation contracts with enterprises and seafood production units to install the system in various districts such as Ben Tre, Dong Nai and Tien Giang in Vietnam, with a scale ranging from 1,000 to 10,000 tanks.
According to the team's estimates, a 150-square-meter Pipi shrimp circulating water farm can earn a profit of VND 73.73 million and a net profit of VND 69.67 million. The profit per kilogram is 4180,000 VND, equivalent to about 1.22 million yuan.
In addition, the pipi shrimp breeding technology of the factory circulating water system consumes less water, restricts water exchange with the outside world (water conservation), reduces the risk of natural disasters and diseases, does not use toxic chemicals, pesticides, antibiotics, should not affect the health of shrimp, and ensure food safety.
It is worth mentioning that the aquaculture system is designed in a modular form, shrimp farmers can deploy according to their own site size, and the amount of aquaculture wastewater is treated by the filtration and purification system, which is cleaner and more hygienic, and will not be directly discharged to the surrounding area, which is convenient for the farm to be close to the market destination for breeding, which is in line with the current social life situation in Vietnam.
Such a circulating water aquaculture model, has long been popularized in our country, including cataqua including the domestic circulating water design, equipment manufacturing team, has been in Wuxi, Wenzhou, Dongguan and other cities to land such box type circulating water farms, successfully bred hairy crabs, Australian crayfish, red claws and other crustacean aquatic organisms, quite recognized by breeding customers.