Recirculating Aquaculture System Case - Urban Aquaculture Holding System


In the Aquaculture Holding Center, many farmers will purchase high-quality finished fish from the sea, put them into temporary holding centres, raise them for a period of time, and then wholesale them to various places. After being adapted for short-term feeding, it will effectively remove fish body pollutants and improve fish quality.


Guangzhou Zhonghang has learned through many aquaculture wholesalers that caged fish were originally raised in cages, but due to the aging of infrastructure, the food chain in natural ecosystems has been frequently destroyed, and large amounts of organics such as baits, excrement, and debris have been used by other organisms. A large amount of nitrogen and phosphorus organic compounds are produced. The eutrophication of the water caused by the accumulation of these organic substances seriously pollutes the ponds, degrades the ecological functions, and increases the number of diseases. The situation is worrying, and it is difficult to make ends meet every year. After a variety of understanding, we learned that the factory-based recirculating aquaculture system can solve the drawbacks of traditional breeding, and began to plan to transform into aquaculture. The customer said that there are several advantages to using the holding center. First, the controllability is high, regardless of the quality of the water or the quality of the fish. Second, it can reduce the transport time and transportation costs because renting a warehouse in the urban area The center, and then according to different customer needs directly to the distribution, so that the cost is reduced and greatly improved the quality of fish.

This case introduces a merchant who specializes in the wholesale of marine fish. After a number of companies have compared, the customer has made contact with our company and conducted several communication and exchanges, and finally reached an agreement with the company's design. After the plan was established, our production personnel immediately went into production. After 15 days, all equipment was completed. The quality inspection department immediately checked the equipment before leaving the factory and the dispatch department arranged the delivery. After a week of delivery, the device successfully reaches the customer.


It is necessary to improve the quality of fish through temporary education, and at the same time it is also relatively controllable to the aquaculture environment. Traditional breeding modes are difficult to achieve. This model is easily affected by the environment and the weather. During the breeding process, it may pose a certain threat to the surrounding ecological environment. At the same time, there are many drawbacks such as high energy consumption, low efficiency and waste of resources, which directly affect the sustainable development of the industry. . The recirculating aquaculture model can use the system circulating water to control the water temperature and dissolved oxygen, and a complete set of water purification equipment to achieve high-density culture of aquatic products and recycling of water.

Recirculating aquaculture systems are viable as a breeding model for holdings for sale. After a period of 7-33 days of temporary maintenance by the customer, the water quality of the system is good. The water quality parameters (dissolved oxygen, ammonia nitrogen, alanine, PH, salinity, temperature, etc.) are all at normal values, and the survival rate is as high as 95%. In the past, it was 30%-50% higher than before without equipment. According to market demand, some varieties have a holding period of up to one month. No matter if the quality of the fish or the quality of meat is very obvious.


Just-installed system-tested semi-slip tongue and grouper ponds

Holding development


Previous holding systems typically placed aeration lines and pumps in the containers to increase the oxygen content in the water and water circulation. Although the water circulation can be achieved through a water pump, impurities such as feces and residual baits generated during shellfish rearing process will continue to flow along with the water circulation, resulting in contamination of water quality. The temporary holding pool is prone to produce ammonia nitrogen during the raising of aquatic animals. Nitrite nitrogen and other substances that are toxic to aquatic animals. At the same time, protein, organic matter, etc. produced by holding pools will also cause damage to the water quality, affect aquatic animal breeding, and reduce the survival time of aquatic animals. In order to prolong the survival time of aquatic animals in holding tanks, it is necessary to treat aquaculture water irregularly according to the number and types of aquatic animals in the holding tanks.

Now improving

As a result of people's continuous improvement, the current holding system has retained microscopic impurities, feces, etc. in the culture water through a microfiltration machine, thereby obtaining the culture water without impurities. The aquaculture water treated by the microfiltration machine is used together with the protein separator by the ozone integrated machine to effectively separate protein, organic matter, and heavy metals in the aquaculture water, and also has various functions such as increasing the system of dissolved oxygen, disinfection and sterilization. The culture water processed by the protein separator is passed through an ultraviolet sterilizer, and the ultraviolet sterilizer sterilizes the culture water, and then discharges ammonia nitrogen and nitrite nitrogen into the biological filtration system to decompose the culture water. The culture water treated by the biological filtration system Into the thermostat system for temperature control process and finally re-introduced into the micro filter to achieve recycling results. The above-mentioned processes can greatly reduce the harmful substances of aquatic animals in aquaculture water, thereby ensuring the environment required for the growth of aquatic animals and prolonging the survival time of aquatic animals.

Holding benefits

  1. The establishment of a holding center in the urban area can reduce the transportation and distribution costs and shorten the transportation time from the farm to the store. The shorter the transportation time, the better the quality of the fish.

  2. The temporary holding center screens and divides and rearranges the fish recovered from different farms, effectively increasing the survival rate of fish and avoiding the inflow of substandard products into the market.

  3. Through this holding system, the quality of the fish can be effectively improved, and the taste of the mud can be reduced. Whether it is taste or meat quality, there will be a great improvement.

  4. Reducing harmful substances in cultured water, removing contaminants from fish, and prolonging the survival time of aquatic animals, so as to avoid the period of low fish prices, determine the time of market according to the price of fish, and increase the economic benefits of breeding.

  5. The breeding density is much higher than that of ordinary fish ponds, and cost and resource waste can be effectively controlled.

  6. The discharged wastewater can also be recycled after treatment to reduce the pollution to the ecological environment.

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