Grouper factory in northern China the cost of circulating water breeding and its components, according to the typical northern circulating water aquaculture technologies and facilities as well as the empirical data and breeding cost, respectively calculates the aquaculture yield to 30 kg/m ~ 2, 40 kg/m ~ 2 and survival rate of 60%, 70% and 70% when pearl gentian grouper breeding cost and its components. The yield per unit area and the survival rate can significantly affect the cost of breeding. When the yield per unit area is 30 kg/m~2 and the survival rate is 60%, the cost is 55.80 yuan /kg; when the yield per unit area is 40 kg/m~2 and the survival rate is 80%, the cost is 45.07 yuan /kg. Expense of seedling, feed, labor, water and electricity, depreciation is the main cost of breeding, accounting for 88%~90% of the total cost. Increased survival rate can significantly reduce the cost per unit seedling, survival rate increased from 60% to 80%, seedling cost from 12.5 yuan /kg to 9.385 yuan /kg. However, increasing unit output can reduce labor, water and electricity, depreciation, management, epidemic prevention, liquid oxygen and other Shared costs. Unit output increases from 30 kg/m~2 to 40 kg/m~2, and the total Shared cost decreases from 29.9 yuan /kg to 22.48 yuan /kg. This study can provide a reference for industrial aquaculture and cost control of grouper in north China.

In 2018, China's circulating aquaculture technology has reached a new level. Many people like a new model of circulating aquaculture, and the global circulating aquaculture system is a new model. On economic benefit, can reduce cost greatly.

In our view, many outside users have a different measure of price. The model and cost of the factory farming system are much lower than the traditional model, and we are entering a new era in the future. The fishing industry is developing in an all-round way. Many people say that fewer and fewer people farm. What about the people who farm? In the new era of global development, the Internet has realized a lot of human operational problems, we from ape human development to now, to achieve a lot of mechanization instead of crop products, in the future, the new industry will reach a new height.

According to the above data, the cost of this model of factory recirculating aquaculture can be obtained. Fish farming can be artificially raised at a low cost, while natural traditional aquaculture is obviously more expensive.

NPS series protein separation, the product unique structure, low energy consumption, high water treatment efficiency. When the microbubbles come into contact with the suspended solids, the surface adsorption will occur due to the surface tension. Micro air bubble upward movement, under the same movement of the water mix, the suspended particles in the water and colloid (mainly the bait and waste of breeding biology organic matter) will adhere to the micro air bubble on the surface, through an air floating method to removal of the colloidal suspension and in aquaculture wastewater organic matter such as cellulose, protein, remnant and feces. At the same time, the protein separator can be used as ozone mixing tower to achieve the function of protein separation and ozone disinfection.

CPS series protein separator has unique structure, low energy consumption and high water treatment efficiency. When the microbubbles come into contact with the suspended solids, the surface adsorption will occur due to the surface tension. Micro bubbles. When moving upward, the water flow moving downward is fully mixed, and the suspended particles and colloid (mainly organics such as residues and excreta of breeding organisms) in the water attach to the surface of microbubbles, and remove organics such as colloids, cellulose, protein, residues and feces suspended in the sewage by air flotation. At the same time, the protein separator can be used as ozone mixing tower to achieve the function of protein separation and ozone disinfection.

We divided the protein into the CPS protein separator and NPS protein separator, we in the face of the requirements of the hydrostatic pressure, as well as the maintenance fault has certain requirements, including the CPS protein separator is give expulsion-typely, ozone recovery capability is strong, and NPS protein separator cannot repair, but can save costs, recycle, save electricity, recycling ability.