Technology of running water fish culture

Through the net to introduce the technology of running water fish culture to you: running water fish culture is different from still water fish culture, it refers to the technology of fish culture in places where there is current flow, mainly refers to reservoirs, lakes, rivers and other places, running water fish culture has its different characteristics from other places. Current aquaculture running water fish culture A way of intensive fish culture in a pond with current exchange. Generally, reservoirs, lakes, rivers, mountain streams and springs are used as water sources. With the help of water level differences, drainage or interception facilities and pumps, water flows continuously through the fish ponds, or the discharged water is purified and then injected into the fish ponds. As the current plays the role of importing dissolved oxygen and removing fish excrement, the pond water can maintain good water quality, creating conditions for high-density intensive culture of fish. The main technology of running water fish culture is to control the fish culture environment, make it conducive to the growth and development of fish, and maximize the growth potential of fish. At present, it has gradually developed from the primary form of normal temperature running water to using computer to automatically monitor and control the flow rate, dissolved oxygen, water temperature, pH, content of various inorganic and organic matter, light and feeding amount of pond water, which has become a modern and efficient way of fish culture. According to the flow mode of water, running water fish culture can be divided into two basic types: open and closed circulation. After the open water source flows through the fish pond, it is no longer recycled, so it consumes a lot of water and is generally used in areas with abundant water sources. According to the control of water temperature, it can be divided into two types: normal temperature running water and warm running water. The primary form of open running water fish culture at room temperature. The utility model has the advantages of small investment, simple pool construction, convenient management and so on. All the natural water sources are used and the water temperature is not adjusted. As the discharged water is not reused, it has been injected with new water, so the water quality is better. In the past, this method was often used to raise ornamental fish in mountainous areas of China or in temples and parks. Since the 1970s, non-crucian carp, common carp, grass carp, blunt snout bream, eel and perch have become the breeding objects of this form. In addition to raising edible fish, but also raising fish fry, fish fry. As there is a positive correlation between flow and output under certain conditions, when building a pond, it is necessary to make full use of the terrain difference to obtain a larger flow rate of the fish pond, and at the same time to make the water flow in and out of the fish pond without additional power, which is the key to whether running water culture at room temperature can have production value. Open warm flow water fish culture is characterized by the ability to adjust the water temperature. Using the warm drainage of natural water sources (hot springs, deep wells) or industrial and mining enterprises (mainly power plants) whose temperature is higher than the air temperature, as the main or regulating water source, it is injected into the fish pond at the same time as the natural normal temperature water, and the appropriate temperature of the pool water is maintained by controlling the flow rate of both. Open warm flow water culture can not only increase the culture density, but also accelerate the growth and development of fish. In the low temperature season, the pond water can keep the temperature suitable for the growth of fish, so it can prolong the growth period of fish, shorten the culture cycle, and promote or inhibit the gonadal development of parent fish. In low temperature areas, the breeding period of parent fish can be advanced by using warm running water, so as to increase the breeding time of seedlings and create conditions for the cultivation of large size fish. Closed circular fish culture is also known as circular filtration fish culture. The characteristic is that the sewage discharged from the pond is purified and then injected into the fish pond, so the total water consumption is less than the former two forms, and the heating method can be used to keep the pond water at a constant temperature. The basic craftsmanship of this way comes from the aquarium. In the late 19th century, the Netherlands, the United States, the United Kingdom and other countries used circular filtration to treat fish water and made it reused for decades. In the 1960s, due to the pollution of the waters of many countries and the increasing demand for live fish, this culture method was used for seedling cultivation and edible fish production, and gradually developed into a new culture technology.