"Factory recycling aquaculture is the ultimate trend of aquaculture", which has long become the consensus of aquatic industry. But after all these years. Most are still in wait-and-see mode. Investigate its fundamental, it is early period investment is exorbitant, final benefit may not be like "BRICK home" WHAT people SAY in that WAY divine is MARVELOUS. Therefore, to do a down-to-earth recycling aquaculture, is a small goal of the Lanling team in recent years.
The investment cost is nothing more than the site, greenhouses, equipment, seedlings, feed these chunks. And if the breeding cycle is too long, the overall benefit will add variables. Because of some, choose good breed breeding, it is the first thing that the friend that prepares to enter pit SHOULD consider.
According to our experience, some niche varieties can be considered if they sell well in the local market. Such as Jiangxi's steelyard fish, Zhejiang's horse mouth fish, Guizhou's red tail fish, Sichuan's Chinese sand loach. If you do not know the market for these niche varieties, you can choose a variety that is well known to the general public. Such as South American white prawn, grouper, half smooth tongue sole, etc. Of course, some of the more familiar species, such as the California perch, the quad fish, etc., will not be considered for the time being. Because their price is not enough to support the current investment in recycled water. (The words are not dead. We will discuss the feasibility of recirculating aquaculture of these varieties further later.)
Because the investment is too large, after screening. Several species can be considered under current domestic conditions for recirculating aquaculture. Among the freshwater varieties, Siniperca chuatsi is a relatively ideal one, provided that the seedlings should be domesticated before being released. Among sea water species, grouper, especially pearl gentian, is the ideal species. In addition, the brackish water white prawn because of the short cycle, quick results. Can still be used as a main variety of recycling aquaculture. But you need to have a considerable technical foundation to operate.
For recirculating aquaculture of pearl gentian grouper, relevant people in the industry have many years of experience in earth pond aquaculture. Combined with recirculating aquaculture system equipment, the density of aquaculture can be greatly improved, so as to improve the economic benefits of the entire aquaculture farm.
If the gentian grouper is cast large seedlings, half a year can be a crop, commercial fish specifications in 1.5 kg/tail. Under the condition of recirculating aquaculture, the culture density can be 60 kg/m3 as the standard density. Based on the 2018 market median price, it can reach 70 yuan/kg. After seedling, feed, civil engineering, labor and other factors, taking 1000 cubic meters of water as an example, the annual net profit can reach 1 to 2 million yuan.
The following is the recirculating water grouper culture system provided by a customer in Fujian. From planning and design, to equipment production, and then to installation and commissioning, are provided by Guangzhou Lanling Aquatic Technology Co., LTD. Aquaculture water of about 400 cubic meters, batch injection of seedlings. The type of pool is cement pool coated with environmental protection paint. The bottom has a pot bottom design. The greenhouse is a double layer heat preserving shed. The salinity is about 28 parts per thousand.
As the first link of circulating aquaculture system, microfilter is the main physical filtration equipment. Firstly, it is used to filter out most of the organic particles such as feces and residual bait in aquaculture water. Behind the microfilter is a main circulating pump. The main circulation pump is a frequency conversion pump. When the system is running, there is only one main circulating pump, and the power saving effect of the frequency conversion pump will reduce the energy consumption of the system operation as much as possible.
The water is pressurized by the pump and enters the protein separator. The protein separator can not only separate the fine suspended matter from the micro-filter, but also increase the dissolved oxygen for the water in the process of treatment. It is also an ozone mixing device. Normally the ozone generator is not turned on. Only in the detection system detection alarm or fish disease is found in the case of open. The idea is to avoid ozone harming the beneficial bacteria in the biofilter system.
Grouper farming often encounters fish diseases. There are mainly peach virus, rainbow virus, small melon worm disease and so on. In view of this, the most important role of recirculating aquaculture system is to prevent disease. Ultraviolet sterilizer is a kind of equipment that can quickly kill bacteria and viruses in water. When the system is running, the ultraviolet sterilizer is kept open, which can effectively control the concentration of pathogenic bacteria or viruses in the water within a certain range, so as to greatly reduce the chance of grouper disease.
Temperature control is achieved through an air-energy heat pump. Air energy heat pump is a kind of new heating equipment, input one degree of electricity, can output 3 to 5 degrees of electricity heat. After setting the temperature range for the first time, the water body of the system can be kept constant automatically.
Biological filtration system is the focus of circulating water filtration system. A large number of brush and other filter media can make beneficial bacteria better attachment and reproduction. Under the condition of high-density recirculating aquaculture, the specific surface area of the brush is not the largest, but it is the easiest to clean. Therefore, recirculating aquaculture can focus on brush as biofiltration material. Combined with a small amount of volcanic stone, coral stone, etc., can adjust the trace elements in the water.
