What Are the Benefits of Micro-Flow Water Fish Farming? A Detailed Guide to Flow-Through Fish Farming Technology
Flow-Through Fish Farming Technology
Zhifujing Network introduces flow-through fish farming technology: Unlike still-water fish farming, flow-through fish farming refers to the technique of raising fish in places where water flows, mainly reservoirs, lakes, rivers, and similar sites. Flow-through fish farming has characteristics that differ from other methods.
Flow-Through Fish Farming
running water fish culture
A method of high-density intensive fish culture carried out in ponds with flowing water exchange. Generally, reservoirs, lakes, rivers, mountain streams, springs, and similar sources are used as water sources. By means of water level differences, diversion or interception facilities, and pumps, water is made to flow continuously through the fish pond, or the discharged water is purified and then returned to the pond. Because the flowing water serves to introduce dissolved oxygen and remove fish excrement, the pond water maintains good quality, creating conditions for high-density intensive fish culture.
The main technique of flow-through fish farming lies in controlling the fish-rearing environment so that it favors the growth and development of fish and maximizes their growth potential. At present, it has gradually developed from the primary form of normal-temperature flowing water to the automatic monitoring and control, by computer, of pond water flow, dissolved oxygen, water temperature, pH, the content of various inorganic and organic substances, lighting, and feeding amount, becoming a modern, highly efficient fish-farming method. According to the way water flows, flow-through fish farming can be divided into two basic types: open-flow and closed recirculating.
Open-flow type: After the water source flows through the fish pond, it is not recovered, so water consumption is relatively large, and it is generally used mostly in areas with abundant water sources. Depending on whether water temperature is controlled or not, it is further divided into two types: normal-temperature flowing water and warm flowing water.
Open-flow normal-temperature flowing water fish farming is the primary form of flow-through fish farming. It has the advantages of low investment, simple pond construction, and convenient management. It entirely uses natural water sources, and the water temperature is not regulated. Because the discharged water is not reused and new water is constantly added, the water quality conditions are relatively good. In China, mountain-area household fish farming in the past, as well as ornamental fish kept in temples and parks, mostly used this method. Since the 1970s, Nile tilapia, carp, grass carp, blunt snout bream, eel, and bass have successively become culture targets for this form. In addition to raising food fish, it is also used to rear fry and fingerlings. Because flow rate and yield are positively correlated under certain conditions, when building ponds, full use should be made of terrain differences so that the fish pond obtains a relatively large flow rate, while at the same time water flows into and out of the pond without additional power. This is the key to whether normal-temperature flowing water fish farming can have production value.
Open-flow warm flowing water fish farming is characterized by the ability to regulate water temperature. Natural water sources with temperatures higher than the air temperature (hot springs, deep wells) or warm discharge water from industrial and mining enterprises (mainly power plants) are used as the main or regulating water source, and are injected into the fish pond together with natural normal-temperature water. By controlling the flow of the two, the pond water is kept at a suitable temperature. Open-flow warm flowing water fish farming can not only increase culture density, but also accelerate the growth and development of fish. In low-temperature seasons, it can keep the pond water at a temperature suitable for fish growth, thereby extending the fish growth period, shortening the culture cycle, and promoting or inhibiting the gonadal development of broodstock. In low-temperature areas, using warm flowing water to cultivate broodstock can advance their breeding period, thereby increasing the rearing time for fry and fingerlings and creating conditions for cultivating large-sized fingerlings.
The closed recirculating type is also called recirculating filtration fish farming. Its characteristic is that the wastewater discharged from the pond is purified and then returned to the fish pond, so total water consumption is less than the previous two forms, and heating can be used to maintain a constant pond water temperature. The basic technique of this method originated from aquariums. In the late 19th century, the Netherlands, the United States, the United Kingdom, and other countries used recirculating filtration to treat fish-farming water, allowing it to be reused for as long as several decades. In the 1960s, because waters in many countries were polluted and demand for live fish continued to increase, this culture method was adopted for fry and fingerling rearing and food fish production, gradually developing into a new aquaculture technique.
Flow-Through Fish Farming
running water fish culture
A method of high-density intensive fish culture carried out in ponds with flowing water exchange. Generally, reservoirs, lakes, rivers, mountain streams, springs, and similar sources are used as water sources. By means of water level differences, diversion or interception facilities, and pumps, water is made to flow continuously through the fish pond, or the discharged water is purified and then returned to the pond. Because the flowing water serves to introduce dissolved oxygen and remove fish excrement, the pond water maintains good quality, creating conditions for high-density intensive fish culture.
The main technique of flow-through fish farming lies in controlling the fish-rearing environment so that it favors the growth and development of fish and maximizes their growth potential. At present, it has gradually developed from the primary form of normal-temperature flowing water to the automatic monitoring and control, by computer, of pond water flow, dissolved oxygen, water temperature, pH, the content of various inorganic and organic substances, lighting, and feeding amount, becoming a modern, highly efficient fish-farming method. According to the way water flows, flow-through fish farming can be divided into two basic types: open-flow and closed recirculating.
Open-flow type: After the water source flows through the fish pond, it is not recovered, so water consumption is relatively large, and it is generally used mostly in areas with abundant water sources. Depending on whether water temperature is controlled or not, it is further divided into two types: normal-temperature flowing water and warm flowing water.
Open-flow normal-temperature flowing water fish farming is the primary form of flow-through fish farming. It has the advantages of low investment, simple pond construction, and convenient management. It entirely uses natural water sources, and the water temperature is not regulated. Because the discharged water is not reused and new water is constantly added, the water quality conditions are relatively good. In China, mountain-area household fish farming in the past, as well as ornamental fish kept in temples and parks, mostly used this method. Since the 1970s, Nile tilapia, carp, grass carp, blunt snout bream, eel, and bass have successively become culture targets for this form. In addition to raising food fish, it is also used to rear fry and fingerlings. Because flow rate and yield are positively correlated under certain conditions, when building ponds, full use should be made of terrain differences so that the fish pond obtains a relatively large flow rate, while at the same time water flows into and out of the pond without additional power. This is the key to whether normal-temperature flowing water fish farming can have production value.
Open-flow warm flowing water fish farming is characterized by the ability to regulate water temperature. Natural water sources with temperatures higher than the air temperature (hot springs, deep wells) or warm discharge water from industrial and mining enterprises (mainly power plants) are used as the main or regulating water source, and are injected into the fish pond together with natural normal-temperature water. By controlling the flow of the two, the pond water is kept at a suitable temperature. Open-flow warm flowing water fish farming can not only increase culture density, but also accelerate the growth and development of fish. In low-temperature seasons, it can keep the pond water at a temperature suitable for fish growth, thereby extending the fish growth period, shortening the culture cycle, and promoting or inhibiting the gonadal development of broodstock. In low-temperature areas, using warm flowing water to cultivate broodstock can advance their breeding period, thereby increasing the rearing time for fry and fingerlings and creating conditions for cultivating large-sized fingerlings.
The closed recirculating type is also called recirculating filtration fish farming. Its characteristic is that the wastewater discharged from the pond is purified and then returned to the fish pond, so total water consumption is less than the previous two forms, and heating can be used to maintain a constant pond water temperature. The basic technique of this method originated from aquariums. In the late 19th century, the Netherlands, the United States, the United Kingdom, and other countries used recirculating filtration to treat fish-farming water, allowing it to be reused for as long as several decades. In the 1960s, because waters in many countries were polluted and demand for live fish continued to increase, this culture method was adopted for fry and fingerling rearing and food fish production, gradually developing into a new aquaculture technique.