Freshwater fish biomimetic flow state circulating live water oxygenation breeding method

Abstract

The application discloses a kind of freshwater fish ecological flow state circulation live water oxygenation aquaculture methods, belong to fish culture technical field, comprising the following steps: S1: construct freshwater fish culture system;S2: planting algae and releasing fry;S3: ecological flow state circulation live water oxygenation aquaculture;The application sets up fish culture system and water circulation system, and height difference is set between fish culture system and water circulation system, and water circulation system returns water to fish culture system, and the cooperation of both can realize the ecological flow state circulation live water state breeding of freshwater fish, while water circulation system returns water to fish culture system in the process of water flow impact water surface in fish culture system, can increase oxygen in water, improve the culture effect of freshwater fish.

Description

Technical Field

[0001] This invention belongs to the field of fish farming technology, specifically relating to a method for freshwater fish farming using a simulated ecological flow-circulating aeration system. Background Technology

[0002] Freshwater fish are fish that inhabit waters with a salinity of less than 0.05%. Their flesh is rich in high-quality protein, unsaturated fatty acids, and trace elements, which can meet daily needs and promote body repair and development as well as cardiovascular health. Therefore, they are very popular among consumers.

[0003] With the increasing demand for freshwater fish, it is crucial to scientifically raise freshwater fish and increase their yield.

[0004] Chinese Patent Application No. 201810197282.7 discloses a high-yield freshwater fish farming method, including selecting fish fry for later use, sterilizing and disinfecting the fish pond, installing water pumps and heaters, laying improved silt soil on the bottom of the fish pond, applying compound fertilizer and covering it with film, taking molds, planting aquatic plants, heating and controlling the water temperature of the fish pond with heaters, stocking the fish fry, feeding the fish regularly, turning on the water pump regularly, conducting regular inspections, regularly spraying fish insecticide in the fish pond, removing excessive aquatic plants and diseased fish, and regularly adding water to the fish pond until the fish fry mature.

[0005] The aforementioned existing technology has the following problems: In the existing high-yield freshwater fish farming method, the dissolved oxygen in the water increases due to oxygen released by aquatic plants through photosynthesis. However, at night, the dissolved oxygen in the fish pond decreases significantly due to oxygen consumption by aquatic plants during respiration. In some cases, this may cause freshwater fish to die from oxygen deficiency, thus reducing the yield of freshwater fish.

[0006] In view of this, a freshwater fish aquaculture method with simulated ecological flow circulation and oxygenation was designed to solve the above problems. Summary of the Invention

[0007] To address the problems mentioned in the background section, this invention provides a method for freshwater fish aquaculture using a simulated ecological flow-circulating oxygenated water system, which improves the effectiveness of freshwater fish farming.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a method for aquaculture of freshwater fish using a simulated ecological flow-circulating aeration system, comprising the following steps:

[0009] S1: Before aquaculture, construct a freshwater fish farming system, including a fish farming system, a water circulation system, and an algae farming system. A height difference is set between the fish farming system and the water circulation system. Water in the fish farming system flows to the water circulation system due to the height difference. At the same time, an adjustable-height water return system is set between the water circulation system and the fish farming system. Water in the water circulation system flows to the fish farming system at different heights due to the water return. At the same time, an adjustable-height system is set between the water circulation system and the algae farming system. Water in the water circulation system may flow to or not flow to the algae farming system due to the height adjustment.

[0010] S2: During cultivation, algae that perform photosynthesis are planted in the algae cultivation system, and freshwater fish fry to be cultivated are placed in the fish cultivation system.

[0011] S3: During the aquaculture process, if it is daytime and the fish are not feeding, the water circulation system is in an upward state. At this time, the water circulation system is connected to the algae cultivation system. Water from the fish cultivation system flows to the water circulation system, and water from the water circulation system flows to the algae cultivation system. The algae release oxygen through photosynthesis, which dissolves in the water, increasing the oxygen content in the water. The water circulation system draws water back and impacts the water in the fish cultivation system, increasing the gas-liquid contact area and increasing the oxygen content in the water. At the same time, it creates fluctuations, mimicking an ecologically active water system in conjunction with the circulation. If it is daytime and the fish are feeding, the water circulation system is raised to allow water to circulate back and forth, while simultaneously scattering food to establish a feeding signal. If it is nighttime, the water circulation system is in a downward state. At this time, the water circulation system is not connected to the algae cultivation system. Water from the fish cultivation system flows to the water circulation system. The water circulation system draws water back and impacts the water in the fish cultivation system, increasing the gas-liquid contact area and increasing the oxygen content in the water. At the same time, it creates fluctuations, mimicking an ecologically active water system in conjunction with the circulation.

[0012] Furthermore, in step S1, the fish farming system includes a fish farming pond set in the foundation pit, and several connecting pipes are set at the bottom of one side wall of the fish farming pond;

[0013] Steps for constructing a fish farming system:

[0014] Excavate a foundation pit in the soil, build a fish farming pond inside the foundation pit, and make several installation holes at equal intervals at the bottom of one side wall of the fish farming pond. Connecting pipes are installed in the installation holes with screws.

[0015] Further, in step S1, the water circulation system includes an installation plate installed on one side wall of the fish farming pond and several second electric cylinders installed at the top of the fish farming pond. A first electric cylinder and a circulation pump are respectively installed at the top of the installation plate. A circulation pool is installed at the output end of the first electric cylinder. The circulation pool is located below the fish farming pond. A filter screen is installed inside the circulation pool. A first connecting port is installed on the side wall of the circulation pool below the filter screen. A main circulation inlet pipe is installed at the inlet end of the circulation pump. An electrically controlled three-way valve is installed at the other end of the main circulation inlet pipe. Branch circulation inlet pipes are installed at the other two valve ports of the electrically controlled three-way valve. The two branch circulation inlet pipes are of different lengths. When the circulation pool is in the rising state, the connecting pipe and the long branch circulation inlet pipe are located below the filter screen, and the short branch circulation inlet pipe is located above the filter screen. When the circulation pool is in the falling state, the connecting pipe and the long and short branch circulation inlet pipes are located above the filter screen. A circulation outlet pipe is installed at the outlet end of the circulation pump. A spray pipe is installed at the output end of the electric cylinder. The other end of the circulation outlet pipe is connected to the spray pipe.

[0016] Steps for constructing a water cycle system:

[0017] An installation plate is installed on the outer wall of the fish farming pond. A first electric cylinder and a circulation pump are installed on the installation plate. A circulation tank with a first connecting port is built in the pit below the fish farming pond. The circulation tank is connected to the first electric cylinder. A filter screen with installation holes is installed above the first connecting port of the circulation tank. One end of the connecting pipe extends through the installation hole of the filter screen to the bottom of the filter screen. A main circulation inlet pipe is installed at the water inlet end of the circulation pump. An electrically controlled three-way valve is installed at the other end of the main circulation inlet pipe. Two branch circulation inlet pipes are installed at the other two valve ports of the electrically controlled three-way valve. The other end of the main circulation inlet pipe extends through the installation hole of the filter screen to the bottom of the filter screen. A circulation outlet pipe is installed at the water outlet end of the circulation pump. Several electric cylinders are installed at the top of the fish farming pond. A spray pipe is installed at the top of the electric cylinder. The circulation outlet pipe is connected to the spray pipe.

[0018] Further, in step S1, the algae cultivation system includes an algae cultivation pond located at the bottom of the fish farming pond. A planting port is provided on one side wall of the algae cultivation pond. Several light tubes are evenly spaced at the top of the algae cultivation pond. A second connecting port is provided on the other side wall of the algae cultivation pond. In the rising state of the circulation pond, the circulation pond is connected to the algae cultivation pond through the first and second connecting ports. When the water level in the algae cultivation pond rises to its highest level but does not exceed the planting port, the circulation pond is in a descending state and is not connected to the algae cultivation pond. Several pile foundations are provided at the bottom of the algae cultivation pond, and one of the pile foundations closes the first connecting port when the circulation pond is in a descending state. A ladder is provided on the outer wall of the algae cultivation pond.

[0019] Steps for constructing an algae cultivation system:

[0020] Several pile foundations are set up in the foundation pit, and algae cultivation ponds with planting openings and second connecting openings are built on the pile foundations. Several light tubes are installed in the algae cultivation ponds, and ladders are built in the foundation pit.

[0021] Fish farming ponds are built on top of algae farming ponds after the algae farming ponds are completed.

[0022] Furthermore, in step S3, the specific steps for the water flow from the fish farming system to the water circulation system include:

[0023] The water in the fish farming ponds flows to the circulation pond through several connecting pipes.

[0024] Furthermore, in step S3, the specific steps for the water to flow from the water circulation system to the algae cultivation system include:

[0025] In the rising state of the circulation pool, the circulation pool is connected to the algae cultivation pool through the first and second connecting ports, and the water in the circulation pool flows to the algae cultivation pool through the first and second connecting ports.

[0026] In the descending state of the circulation pool, the first and second connecting ports are staggered, and the first connecting port of the circulation pool is closed by a certain pile foundation. The circulation pool and the algae cultivation pool are not connected, and the water in the circulation pool cannot flow to the algae cultivation pool through the first and second connecting ports.

[0027] Furthermore, in step S3, the specific steps of the water circulation system drawing water back to impact the water in the fish farming system include:

[0028] In the rising state of the circulation tank, the connecting pipe and the long branch circulation inlet pipe are located below the filter screen, and the short branch circulation inlet pipe is located above the filter screen. The circulation tank is connected to the algae cultivation tank through the first and second connecting ports. The electric three-way valve is switched to connect the main circulation inlet pipe and the short branch circulation inlet pipe. The circulation pump is started, and the water in the circulation tank is pumped to the spray pipe for spraying through the short branch circulation inlet pipe, the main circulation inlet pipe, and the circulation outlet pipe. The sprayed water flows back to the fish farming system.

[0029] In the descending state of the circulating pool, the connecting pipe and the long and short branch circulating water inlet pipes are located above the filter screen. The first and second connecting ports are staggered, and the first connecting port of the circulating pool is closed when a certain pile foundation is closed. The circulating pool is not connected to the algae cultivation pool. The electric three-way valve is switched to connect the main circulating water inlet pipe with the long branch circulating water inlet pipe. The circulating pump starts, and the water in the circulating pool is pumped to the spray pipe for spraying through the long branch circulating water inlet pipe, the main circulating water inlet pipe and the circulating water outlet pipe. The sprayed water flows back to the fish farming system.

[0030] Furthermore, in step S3, the specific steps for adjusting the water circulation system to a higher height for water recirculation include:

[0031] The height of the spray pipe is adjusted using the second electric cylinder.

[0032] Furthermore, in step S3, the specific steps of scattering the food include:

[0033] Fish food is scattered into the circulating tank above the filter screen through a feeding pipe with timed and quantitative feeding. The food is then pumped and sprayed into the fish farming pond.

[0034] The sprayed fish food is dynamic and can simulate live bait, increasing the feeding interest of freshwater fish.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] 1. This invention sets up a fish farming system and a water circulation system, with a height difference between the two. The water circulation system returns water to the fish farming system. The two work together to achieve a simulated ecological flow-circulating living water state for freshwater fish farming. At the same time, the water flow impacts the water surface in the fish farming system during the water circulation system's return of water to the fish farming system, which can increase the oxygen in the water and improve the farming effect of freshwater fish.

[0037] 2. This invention sets up an algae cultivation system that is connected to the water circulation system during the day, allowing algae photosynthesis to increase oxygen levels in the water. At night, however, the system is not connected to the water circulation system to prevent the carbon dioxide and other substances produced by algae respiration from affecting freshwater fish, thereby improving the freshwater fish farming results.

[0038] 3. The reflux height of the water circulation system of this invention is adjustable. When not feeding, the height can be fixed, reducing the distance from the water surface of the fish farming system, thus reducing the impact sound and simulating the sound of flowing water, thereby increasing the stress response of freshwater fish. When feeding, the height can be increased, increasing the distance from the water surface of the fish farming system, thus increasing the impact sound. Feeding at this time can train the feeding signals of freshwater fish, avoid wasting the fish food, and reduce the possibility of fish food polluting the water quality, thereby improving the freshwater fish farming effect. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the present invention during the daytime breeding state;

[0040] Figure 2 This is a schematic diagram of the structure of the present invention during nighttime aquaculture. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] This invention provides the following technical solution: a method for aquaculture of freshwater fish using a simulated ecological flow-circulating oxygenated water system, comprising the following steps:

[0043] S1: Before aquaculture, construct a freshwater fish farming system, including a fish farming system, a water circulation system, and an algae farming system. A height difference is set between the fish farming system and the water circulation system. Water in the fish farming system flows to the water circulation system due to the height difference. At the same time, an adjustable-height water return system is set between the water circulation system and the fish farming system. Water in the water circulation system flows to the fish farming system at different heights due to the water return. At the same time, an adjustable-height system is set between the water circulation system and the algae farming system. Water in the water circulation system may flow to or not flow to the algae farming system due to the height adjustment.

[0044] S2: During cultivation, algae that perform photosynthesis are planted in the algae cultivation system, and freshwater fish fry to be cultivated are placed in the fish cultivation system.

[0045] S3: During the aquaculture process, if it is daytime and the fish are not feeding, the water circulation system is in an upward state. At this time, the water circulation system is connected to the algae cultivation system. Water from the fish cultivation system flows to the water circulation system, and water from the water circulation system flows to the algae cultivation system. The algae release oxygen through photosynthesis, which dissolves in the water, increasing the oxygen content in the water. The water circulation system draws water back and impacts the water in the fish cultivation system, increasing the gas-liquid contact area and increasing the oxygen content in the water. At the same time, it creates fluctuations, mimicking an ecologically active water system in conjunction with the circulation. If it is daytime and the fish are feeding, the water circulation system is raised to allow water to circulate back and forth, while simultaneously scattering food to establish a feeding signal. If it is nighttime, the water circulation system is in a downward state. At this time, the water circulation system is not connected to the algae cultivation system. Water from the fish cultivation system flows to the water circulation system. The water circulation system draws water back and impacts the water in the fish cultivation system, increasing the gas-liquid contact area and increasing the oxygen content in the water. At the same time, it creates fluctuations, mimicking an ecologically active water system in conjunction with the circulation.

[0046] Specifically, in step S1, the fish farming system includes a fish farming pond set in the foundation pit, and several connecting pipes are set at the bottom of one side wall of the fish farming pond;

[0047] Steps for constructing a fish farming system:

[0048] Excavate a foundation pit in the soil, build a fish farming pond inside the foundation pit, and make several installation holes at equal intervals at the bottom of one side wall of the fish farming pond. Connecting pipes are installed in the installation holes with screws.

[0049] Specifically, in step S1, the water circulation system includes an installation plate installed on one side wall of the fish farming pond and several second electric cylinders installed at the top of the fish farming pond. A first electric cylinder and a circulation pump are respectively installed at the top of the installation plate. A circulation pool is installed at the output end of the first electric cylinder. The circulation pool is located below the fish farming pond. A filter screen is installed inside the circulation pool. A first connecting port is installed on the side wall of the circulation pool below the filter screen. A main circulation inlet pipe is installed at the inlet end of the circulation pump. An electrically controlled three-way valve is installed at the other end of the main circulation inlet pipe. Branch circulation inlet pipes are installed at the other two valve ports of the electrically controlled three-way valve. The two branch circulation inlet pipes are of different lengths. When the circulation pool is in the rising state, the connecting pipe and the long branch circulation inlet pipe are located below the filter screen, and the short branch circulation inlet pipe is located above the filter screen. When the circulation pool is in the falling state, the connecting pipe and the long and short branch circulation inlet pipes are located above the filter screen. A circulation outlet pipe is installed at the outlet end of the circulation pump. A spray pipe is installed at the output end of the electric cylinder. The other end of the circulation outlet pipe is connected to the spray pipe.

[0050] Steps for constructing a water cycle system:

[0051] An installation plate is installed on the outer wall of the fish farming pond. A first electric cylinder and a circulation pump are installed on the installation plate. A circulation tank with a first connecting port is built in the pit below the fish farming pond. The circulation tank is connected to the first electric cylinder. A filter screen with installation holes is installed above the first connecting port of the circulation tank. One end of the connecting pipe extends through the installation hole of the filter screen to the bottom of the filter screen. A main circulation inlet pipe is installed at the water inlet end of the circulation pump. An electrically controlled three-way valve is installed at the other end of the main circulation inlet pipe. Two branch circulation inlet pipes are installed at the other two valve ports of the electrically controlled three-way valve. The other end of the main circulation inlet pipe extends through the installation hole of the filter screen to the bottom of the filter screen. A circulation outlet pipe is installed at the water outlet end of the circulation pump. Several electric cylinders are installed at the top of the fish farming pond. A spray pipe is installed at the top of the electric cylinder. The circulation outlet pipe is connected to the spray pipe.

[0052] Specifically, in step S1, the algae cultivation system includes an algae cultivation pond located at the bottom of the fish farming pond. A planting port is provided on one side wall of the algae cultivation pond. Several light tubes are evenly spaced at the top of the algae cultivation pond. A second connecting port is provided on the other side wall of the algae cultivation pond. In the rising state of the circulation pond, the circulation pond is connected to the algae cultivation pond through the first and second connecting ports. When the water level in the algae cultivation pond rises to its highest level but does not exceed the planting port, the circulation pond is in a descending state and is not connected to the algae cultivation pond. Several pile foundations are provided at the bottom of the algae cultivation pond, and one of the pile foundations closes the first connecting port when the circulation pond is in the descending state. A ladder is provided on the outer wall of the algae cultivation pond.

[0053] Steps for constructing an algae cultivation system:

[0054] Several pile foundations are set up in the foundation pit, and algae cultivation ponds with planting openings and second connecting openings are built on the pile foundations. Several light tubes are installed in the algae cultivation ponds, and ladders are built in the foundation pit.

[0055] Fish farming ponds are built on top of algae farming ponds after the algae farming ponds are completed.

[0056] Specifically, in step S3, the specific steps for the water flow from the fish farming system to the water circulation system include:

[0057] The water in the fish farming ponds flows to the circulation pond through several connecting pipes.

[0058] Specifically, in step S3, the specific steps for the water to flow from the water cycle system to the algae cultivation system include:

[0059] In the rising state of the circulation pool, the circulation pool is connected to the algae cultivation pool through the first and second connecting ports, and the water in the circulation pool flows to the algae cultivation pool through the first and second connecting ports.

[0060] In the descending state of the circulation pool, the first and second connecting ports are staggered, and the first connecting port of the circulation pool is closed by a certain pile foundation. The circulation pool and the algae cultivation pool are not connected, and the water in the circulation pool cannot flow to the algae cultivation pool through the first and second connecting ports.

[0061] Specifically, in step S3, the specific steps of the water circulation system drawing water back to impact the water in the fish farming system include:

[0062] In the rising state of the circulation tank, the connecting pipe and the long branch circulation inlet pipe are located below the filter screen, and the short branch circulation inlet pipe is located above the filter screen. The circulation tank is connected to the algae cultivation tank through the first and second connecting ports. The electric three-way valve is switched to connect the main circulation inlet pipe and the short branch circulation inlet pipe. The circulation pump is started, and the water in the circulation tank is pumped to the spray pipe for spraying through the short branch circulation inlet pipe, the main circulation inlet pipe, and the circulation outlet pipe. The sprayed water flows back to the fish farming system.

[0063] In the descending state of the circulating pool, the connecting pipe and the long and short branch circulating water inlet pipes are located above the filter screen. The first and second connecting ports are staggered, and the first connecting port of the circulating pool is closed when a certain pile foundation is closed. The circulating pool is not connected to the algae cultivation pool. The electric three-way valve is switched to connect the main circulating water inlet pipe with the long branch circulating water inlet pipe. The circulating pump starts, and the water in the circulating pool is pumped to the spray pipe for spraying through the long branch circulating water inlet pipe, the main circulating water inlet pipe and the circulating water outlet pipe. The sprayed water flows back to the fish farming system.

[0064] Specifically, in step S3, the steps for raising the water circulation system to perform water recirculation include:

[0065] The height of the spray pipe is adjusted using the second electric cylinder.

[0066] Specifically, in step S3, the specific steps for scattering the food include:

[0067] Fish food is scattered into the circulating tank above the filter screen through a feeding pipe with timed and quantitative feeding. The food is then pumped and sprayed into the fish farming pond.

[0068] The sprayed fish food is dynamic and can simulate live bait, increasing the feeding interest of freshwater fish. Specific Implementation

[0070] Algae, capable of photosynthesis, are planted at the same density in the soil within the algae cultivation pond through the planting port.

[0071] Turn on the light;

[0072] Fish fry were released into the fish farming pond;

[0073] During the daytime and when the fish are not feeding, the first electric cylinder starts, moving the circulation tank to an elevated position. At this time, the connecting pipe is located below the filter screen of the circulation tank. The first connecting port of the circulation tank is connected to the second connecting port of the algae cultivation tank. The long branch circulation inlet pipe is located below the filter screen of the circulation tank, and the short branch circulation inlet pipe is located above the filter screen of the circulation tank. The main circulation inlet pipe of the electrically controlled three-way valve is connected to the two valve ports of the short branch circulation inlet pipe. Due to the height difference, the water in the fish cultivation tank flows through several connecting pipes to the circulation tank located below the filter screen. The water in the circulation tank flows to the algae cultivation tank through the first and second connecting ports. The algae in the algae cultivation tank absorb light energy and perform photosynthesis, releasing oxygen. The circulation pump starts, and through the short branch circulation inlet pipe, the main circulation inlet pipe, and the circulation outlet pipe, the water above the filter screen in the circulation tank is returned to the spray pipe and sprayed into the fish cultivation tank.

[0074] The aforementioned connecting pipes allow water from the fish farming pond to fall below the filter screen of the circulating pond and flow into the algae farming pond. This not only increases the dissolved oxygen in the water but also purifies the water of harmful substances such as feces.

[0075] The aforementioned filter screen can intercept debris in the circulating pool. The water flows back through the short branch circulating water inlet pipe above the filter screen, which can prevent debris flowing into the circulating water and soil and other debris in the algae cultivation pool from flowing back into the fish farming pool.

[0076] The water in the fish farming pond flows to the circulation pond due to the height difference, the water in the circulation pond flows to the algae farming pond, and the water in the circulation pond flows back to the fish farming pond. This can simulate ecological flow circulation and live water farming. At the same time, the oxygen released by the algae and the water surface impact can increase oxygen and improve the freshwater fish farming effect.

[0077] During the day and while the fish are feeding, the second electric cylinder is activated, raising the position of the spray pipe. At the same time, the feed pipe feeds the fish, and the water and feed in the circulation tank flow back to the fish farming pond according to the above steps.

[0078] The aforementioned lifting of the spray pipe increases the distance between the spray pipe and the water surface in the fish farming pond, increasing the impact force. This can distinguish the water ripples in the fish farming pond from those in a non-feeding state. Combined with feeding, it can train the feeding signals of freshwater fish, enabling them to feed quickly when there are similar water ripples, avoiding feed waste and preventing feed from polluting the water in the fish farming pond.

[0079] At night, the first electric cylinder starts, moving the circulation pool to a lowered state. At this time, the connecting pipe is located below and above the filter screen of the circulation pool. The first connecting port of the circulation pool is offset from the second connecting port of the algae cultivation pool, and the first connecting port is sealed by the pile foundation. The long and short branch circulation inlet pipes are located above the filter screen of the circulation pool. The main circulation inlet pipe of the electrically controlled three-way valve is connected to the two valve ports of the long branch circulation inlet pipe. The water in the fish cultivation pool flows to the circulation pool through several connecting pipes due to the height difference. The circulation pump starts and returns the water in the circulation pool to the spray pipe through the long branch circulation inlet pipe, the main circulation inlet pipe, and the circulation outlet pipe. The water is then sprayed into the fish cultivation pool by the spray pipe.

[0080] The water in the fish farming pond flows to the circulation pond due to the height difference, the water in the circulation pond flows to the algae farming pond, and the water in the circulation pond flows back to the fish farming pond. This can simulate ecological flow circulation and live water farming. At the same time, the water surface impact can increase oxygen and improve the freshwater fish farming effect.

[0081] The closure of the first connection port mentioned above is only achieved when a pile foundation is located exactly at the first connection port during the actual implementation. If the actual implementation is carried out again, any structure that can close the first connection port can be used.

[0082] The above specific embodiments are only described in detail for oxygenation. In actual implementation, algae density control, fish pond disinfection, fry density control, regular fry inspection and regular removal of dead fish should all be carried out simultaneously, and the steps are the same as those in the prior art, so they will not be repeated here.

[0083] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for aquaculture of freshwater fish using a simulated ecological flow-circulating aeration system, characterized in that... Includes the following steps: S1: Before aquaculture, construct a freshwater fish farming system, including a fish farming system, a water circulation system, and an algae farming system. A height difference is set between the fish farming system and the water circulation system. Water in the fish farming system flows to the water circulation system due to the height difference. At the same time, an adjustable-height water return system is set between the water circulation system and the fish farming system. Water in the water circulation system flows to the fish farming system at different heights due to the water return. At the same time, an adjustable-height system is set between the water circulation system and the algae farming system. Water in the water circulation system may flow to or not flow to the algae farming system due to the height adjustment. The water circulation system includes an installation plate mounted on one side wall of the fish farming pond and several second electric cylinders mounted on the top of the fish farming pond. A first electric cylinder and a circulation pump are respectively installed on the top of the installation plate. A circulation pool is located at the output end of the first electric cylinder, below the fish farming pond. A filter screen is installed inside the circulation pool. A first connecting port is located on the side wall of the circulation pool below the filter screen. A main circulation inlet pipe is installed at the inlet end of the circulation pump. An electrically controlled three-way valve is installed at the other end of the main circulation inlet pipe. Branch circulation inlet pipes are installed at the other two ports of the electrically controlled three-way valve, one long and one short. In the upward state of the circulation pool, the connecting pipe and the long branch circulation inlet pipe are located below the filter screen, and the short branch circulation inlet pipe is located above the filter screen. In the downward state of the circulation pool, the connecting pipe and the long and short branch circulation inlet pipes are located above the filter screen. A circulation outlet pipe is installed at the outlet end of the circulation pump. A spray pipe is installed at the output end of the second electric cylinder, and the other end of the circulation outlet pipe is connected to the spray pipe. Steps for constructing a water cycle system: An installation plate is installed on the outer wall of the fish farming pond. A first electric cylinder and a circulation pump are installed on the installation plate. A circulation tank with a first connecting port is built in the pit below the fish farming pond. The circulation tank is connected to the first electric cylinder. A filter screen with installation holes is installed above the first connecting port of the circulation tank. One end of the connecting pipe extends through the installation hole of the filter screen to the bottom of the filter screen. A main circulation inlet pipe is installed at the water inlet end of the circulation pump. An electrically controlled three-way valve is installed at the other end of the main circulation inlet pipe. Two branch circulation inlet pipes are installed at the other two valve ports of the electrically controlled three-way valve. The other end of the long circulation inlet pipe extends through the installation hole of the filter screen to the bottom of the filter screen. A circulation outlet pipe is installed at the water outlet end of the circulation pump. Several second electric cylinders are installed at the top of the fish farming pond. A spray pipe is installed at the top of the second electric cylinder. The circulation outlet pipe is connected to the spray pipe. The algae cultivation system includes an algae cultivation pond located at the bottom of a fish farming pond. A planting inlet is located on one side wall of the algae cultivation pond. Several light tubes are evenly spaced at the top of the algae cultivation pond's interior. A second connecting opening is located on the other side wall of the algae cultivation pond. In a rising state, the circulation pond is connected to the algae cultivation pond via the first and second connecting openings. When the water level in the algae cultivation pond rises to its highest level but does not exceed the planting inlet, the circulation pond is in a descending state and is not connected to the algae cultivation pond. Several pile foundations are located at the bottom of the algae cultivation pond, with one pile foundation sealing the first connecting opening when the circulation pond is descending. A ladder is installed on the outer wall of the algae cultivation pond. Steps for constructing an algae cultivation system: Several pile foundations are set up in the foundation pit, and algae cultivation ponds with planting openings and second connecting openings are built on the pile foundations. Several light tubes are installed in the algae cultivation ponds, and ladders are built in the foundation pit. Fish farming ponds are built on top of algae farming ponds after the algae farming ponds are constructed. S2: During cultivation, algae that perform photosynthesis are planted in the algae cultivation system, and freshwater fish fry to be cultivated are placed in the fish cultivation system. S3: During the aquaculture process, if it is daytime and the fish are not feeding, the water circulation system is in an upward state. At this time, the water circulation system is connected to the algae cultivation system. Water from the fish cultivation system flows to the water circulation system, and water from the water circulation system flows to the algae cultivation system. The algae release oxygen through photosynthesis, which dissolves in the water, increasing the oxygen content in the water. The water circulation system draws water back and impacts the water in the fish cultivation system, increasing the gas-liquid contact area and increasing the oxygen content in the water. At the same time, it creates fluctuations, mimicking an ecologically active water system in conjunction with the circulation. If it is daytime and the fish are feeding, the water circulation system is raised to allow water to circulate back and forth, while simultaneously scattering food to establish a feeding signal. If it is nighttime, the water circulation system is in a downward state. At this time, the water circulation system is not connected to the algae cultivation system. Water from the fish cultivation system flows to the water circulation system, and the water circulation system draws water back and impacts the water in the fish cultivation system, increasing the gas-liquid contact area and increasing the oxygen content in the water. At the same time, it creates fluctuations, mimicking an ecologically active water system in conjunction with the circulation. The specific steps for raising the water circulation system to achieve water recirculation include: The height of the spray pipe is adjusted using the second electric cylinder.

2. The method for freshwater fish aquaculture using a simulated ecological flow-circulating aeration system according to claim 1, characterized in that: In step S1, the fish farming system includes a fish farming pond set in the foundation pit, and several connecting pipes are set at the bottom of one side wall of the fish farming pond. Steps for constructing a fish farming system: Excavate a foundation pit in the soil, build a fish farming pond inside the foundation pit, and make several installation holes at equal intervals at the bottom of one side wall of the fish farming pond. Connecting pipes are installed in the installation holes with screws.

3. The method for freshwater fish aquaculture using a simulated ecological flow-circulating oxygenation system according to claim 2, characterized in that: In step S3, the specific steps for the water flow from the fish farming system to the water circulation system include: The water in the fish farming ponds flows to the circulation pond through several connecting pipes.

4. The method for freshwater fish aquaculture using a simulated ecological flow-circulating aeration system according to claim 3, characterized in that: In step S3, the specific steps for the water to flow from the water circulation system to the algae cultivation system include: In the rising state of the circulation pool, the circulation pool is connected to the algae cultivation pool through the first and second connecting ports, and the water in the circulation pool flows to the algae cultivation pool through the first and second connecting ports. In the descending state of the circulation pool, the first and second connecting ports are staggered, and the first connecting port of the circulation pool is closed by a certain pile foundation. The circulation pool and the algae cultivation pool are not connected, and the water in the circulation pool cannot flow to the algae cultivation pool through the first and second connecting ports.

5. The method for freshwater fish aquaculture using a simulated ecological flow-circulating aeration system according to claim 4, characterized in that: In step S3, the specific steps of the water circulation system drawing water back to impact the water in the fish farming system include: In the rising state of the circulation tank, the connecting pipe and the long branch circulation inlet pipe are located below the filter screen, and the short branch circulation inlet pipe is located above the filter screen. The circulation tank is connected to the algae cultivation tank through the first and second connecting ports. The control of the electric three-way valve switches to connect the main circulation inlet pipe with the short branch circulation inlet pipe. The circulation pump starts, and the water in the circulation tank is pumped to the spray pipe for spraying through the short branch circulation inlet pipe, the main circulation inlet pipe, and the circulation outlet pipe. The sprayed water flows back to the fish farming system. In the descending state of the circulating pool, the connecting pipe and the long and short branch circulating water inlet pipes are located above the filter screen. The first and second connecting ports are staggered, and the first connecting port of the circulating pool is closed when a certain pile foundation is closed. The circulating pool is not connected to the algae cultivation pool. The controllable three-way valve is switched to connect the main circulating water inlet pipe with the long branch circulating water inlet pipe. The circulating pump starts, and the water in the circulating pool is pumped to the spray pipe for spraying through the long branch circulating water inlet pipe, the main circulating water inlet pipe and the circulating water outlet pipe. The sprayed water flows back to the fish farming system.

6. The method for freshwater fish aquaculture using a simulated ecological flow-circulating aeration system according to claim 5, characterized in that: In step S3, the specific steps of scattering the food include: Fish food is scattered into the circulating tank above the filter screen through a feeding pipe with timed and quantitative feeding. The food is then pumped and sprayed into the fish farming pond. The sprayed fish food is dynamic and can simulate live bait, increasing the feeding interest of freshwater fish.

Images