A gradient stress type diptychus fat-reducing and deodorizing cultivation system and cultivation method

Abstract

The application discloses a gradient stress type lifting water fish fat-reducing and deodorization breeding system and a breeding method, relates to the field of water state breeding and intelligent breeding technology, and comprises a closed constant-temperature breeding workshop, a ring-shaped closed-loop breeding pool, a gradient water flow driving assembly, a dynamic dissolved oxygen supply assembly, a multistage water quality purification assembly, an intelligent monitoring and regulation assembly, an automatic pollution discharge assembly, an external water supplement pipeline and an ozone generator, the ring-shaped closed-loop breeding pool is arranged in the closed constant-temperature breeding workshop, the inner wall of the ring-shaped closed-loop breeding pool is provided with an anti-seepage and anti-corrosion lining, the gradient water flow driving assembly and the multistage water quality purification assembly are respectively connected with the ring-shaped closed-loop breeding pool through pipelines, and the gradient water flow driving assembly, the ring-shaped closed-loop breeding pool and the multistage water quality purification assembly are connected to form a main water circulation pipeline of water bodies. The application adopts the gradient stress type lifting water fish fat-reducing and deodorization breeding system and the breeding method, adopts a ring-shaped gradient water flow, ozone pre-purification, pool bottom full-area oxygenation and an intelligent linkage control structure.

Description

Technical Field

[0001] This invention relates to the fields of aquatic ecological aquaculture and intelligent aquaculture technology, and in particular to a gradient stress-based fat reduction and deodorization aquaculture system and method for hanging fish. Background Technology

[0002] Suspended-water culture is a key quality improvement process for high-quality commercial fish before they are marketed. Its principle is to encourage fish to swim autonomously and metabolize excess fat and decompose odor-causing metabolic products by temporarily holding them in clean water, stimulating them with moderate water flow, and dynamically controlling water quality. This reduces the fat content of the fish meat, removes the muddy taste, and significantly improves the texture and appearance of the meat. It is a core link in the current high-end freshwater and ecological fish farming and processing, and is widely applicable to large-scale aquaculture, live holding, and pre-processing of premium aquatic products for the market.

[0003] Currently, most conventional suspended aquaculture systems in the industry use fixed static ponds or constant-flow aquaculture ponds. These systems have fixed aquaculture environmental parameters and limited control methods, resulting in numerous technical shortcomings in practical production applications. Firstly, the constant water flow in traditional aquaculture ponds fails to create a dynamic gradient flow environment. This leads to insufficient stimulation of fish movement, low activity frequency, and low fat metabolism efficiency, resulting in long suspension cycles, uneven fat reduction, and limited quality improvement, making it difficult to meet the demands of rapid, large-scale suspended aquaculture production. Secondly, conventional suspended aquaculture relies solely on simple physical filtration for water purification, lacking targeted pre-disinfection, deodorization, and residue reduction methods. Residual planktonic metabolites, trace impurities, and endogenous odor substances in the aquaculture water cannot be effectively removed, resulting in varying degrees of earthy taste in the finished fish meat and inconsistent product quality.

[0004] Meanwhile, most existing aquaculture equipment uses surface aeration to increase oxygen, which easily causes oxygen stratification between the upper and lower layers of the water. The water at the bottom of the pond is in a state of low dissolved oxygen for a long time. After the uneaten feed and feces are deposited at the bottom, anaerobic bacteria are easily generated and putrefied, which further aggravates the deterioration of the water and the accumulation of odors, greatly shortens the water replacement cycle, and the energy consumption and operation and maintenance costs of aquaculture are relatively high. Summary of the Invention

[0005] The purpose of this invention is to provide a gradient stress-based fat reduction and deodorization aquaculture system and method for hanging fish, which overcomes the shortcomings of existing hanging fish aquaculture systems, such as single water flow, poor fat reduction and deodorization effect, uneven dissolved oxygen in the water, and easy accumulation of dirt at the bottom of the pond. The aim is to improve the fat reduction and deodorization quality of hanging fish by setting up gradient circulation, ozone pre-purification, bottom distributed oxygenation, and intelligent self-controlled sewage discharge structure, and to achieve intelligent and stable operation of the aquaculture process.

[0006] This invention provides a gradient stress-based fat reduction and deodorization aquaculture system for pontoon fish, comprising a closed-loop constant-temperature aquaculture plant, a ring-shaped closed-loop aquaculture tank, a gradient water flow drive component, a dynamic dissolved oxygen supply component, a multi-stage water purification component, an intelligent monitoring and control component, an automatic sewage discharge component, an external water supply pipeline, and an ozone generator. The ring-shaped closed-loop aquaculture tank is located inside the closed-loop constant-temperature aquaculture plant, and its inner wall is lined with a seepage-proof and corrosion-resistant lining. The gradient water flow drive component and the multi-stage water purification component are respectively connected to the ring-shaped closed-loop aquaculture tank via pipelines. The closed-loop aquaculture pond consists of a gradient water flow drive component, a ring-shaped closed-loop aquaculture pond, and a multi-stage water purification component, forming the main water circulation path. A dynamic dissolved oxygen supply component is installed at the bottom of the ring-shaped closed-loop aquaculture pond and is connected to the air passage of the ring-shaped closed-loop aquaculture pond. An automatic sewage discharge component is arranged along the bottom of the ring-shaped closed-loop aquaculture pond and is connected to the bottom pipe of the ring-shaped closed-loop aquaculture pond. An external water supply pipe is connected to the multi-stage water purification component. An ozone generator is located between the external water supply pipe and the multi-stage water purification component and is connected to the multi-stage water purification component.

[0007] Preferably, the intelligent monitoring and control components are arranged in a closed, constant-temperature aquaculture plant, and are electrically connected to the gradient water flow drive components, the dynamic dissolved oxygen supply components, and the automatic sewage discharge components.

[0008] Preferably, the variable flow drive component includes a variable frequency water circulation pump, a flow regulating valve, a distributed guide plate, and an inlet valve. The multi-stage water purification component is equipped with an outlet valve. One end of the variable frequency water circulation pump is connected to the multi-stage water purification component, and the other end of the variable frequency water circulation pump is connected to the annular closed-loop aquaculture tank in sequence via the flow regulating valve and the inlet valve. The annular closed-loop aquaculture tank is reconnected to the multi-stage water purification component through the outlet valve pipeline.

[0009] Preferably, the dynamic dissolved oxygen supply component includes a variable frequency aeration blower, a main air supply pipe, branch air pipes, a nanoporous aeration disc, and an electrical control box. The variable frequency aeration blower is connected to the nanoporous aeration disc at the bottom of the annular closed-loop aquaculture pond via the main air supply pipe and branch air pipes, and the electrical control box is electrically connected to the main control terminal.

[0010] Preferably, the automatic sewage discharge assembly includes a bottom sewage collection trough, an inclined guide slope, a sewage suction pipe, an electric timed sewage pump, an electromagnetic sewage valve, a sewage storage box, and a return filter screen. The inclined guide slope is symmetrically arranged on both sides of the bottom sewage collection trough and is located at the bottom of the annular closed-loop aquaculture pond. The bottom sewage collection trough has a pipe opening that connects to the annular closed-loop aquaculture pond and is equipped with a return filter screen. The bottom sewage collection trough is connected to the electromagnetic sewage valve and the electric timed sewage pump in sequence through the sewage suction pipe and then connected to the sewage storage box.

[0011] Preferably, the intelligent monitoring and control component includes a multi-parameter water quality sensor, a water temperature sensor, a flow velocity sensor, a water level monitoring sensor, a turbidity sensor, a main control terminal, and an audible and visual alarm. The multi-parameter water quality sensor, water temperature sensor, flow velocity sensor, water level monitoring sensor, and turbidity sensor are all placed inside the annular closed-loop aquaculture pond and electrically connected to the main control terminal. The main control terminal is electrically connected to a variable frequency water circulation pump, an electric control regulating box, an electric timed sewage pump, an electromagnetic sewage valve, and an audible and visual alarm.

[0012] Preferably, the ozone generator is connected to an external water supply pipeline and a multi-stage water purification component at both ends, and the ozone generator output pipeline is connected to the inside of the multi-stage water purification component.

[0013] A method for raising fish using a gradient stress-induced fat reduction and deodorization aquaculture system includes the following steps: Step S1, Water replenishment and purification stage: Water source is sent to ozone generator through external water replenishment pipeline. Ozone generated by ozone generator is simultaneously introduced into multi-stage water quality purification components to complete water pretreatment. Water level monitoring sensor monitors the water level in the annular closed-loop aquaculture pond in real time. Water is continuously replenished when the water level is insufficient. Step S2, Gradient Water Circulation Stage: The variable frequency water circulation pump draws purified water from the multi-stage water purification components and sends it into the annular closed-loop aquaculture pond. The water flows through the distributed guide plate to form a gradient circulation. The pond water flows back to the multi-stage water purification components through the outlet valve for circulation. The main control terminal adjusts the operation status of the variable frequency water circulation pump based on the data collected by the flow velocity sensor. Step S3, bottom dynamic oxygenation stage; the variable frequency aeration blower delivers gas to the nanoporous aeration discs at the bottom of the annular closed-loop aquaculture pond through the main air supply pipe and branch air pipes. The main control terminal adjusts the air supply of the variable frequency aeration blower through the electric control adjustment box based on dissolved oxygen data from multi-parameter water quality sensors. Step S4, Monitoring and Early Warning Stage: Multi-parameter water quality sensors, water temperature sensors, and turbidity sensors collect water quality data in real time and transmit it to the main control terminal. When water quality exceeds the standard or equipment malfunctions, the main control terminal activates the audible and visual alarm to issue an audible and visual alarm. Step S5, Automatic Sewage Discharge Stage: Sewage in the circular closed-loop aquaculture pond flows along the inclined guide slope into the bottom sludge collection tank. The return filter screen traps solid impurities. The main control terminal periodically activates the electric timed sewage pump and electromagnetic sewage valve to pump the sewage in the bottom sludge collection tank into the sewage temporary storage tank. The sewage in the sewage temporary storage tank is periodically discharged.

[0014] Therefore, this invention adopts the above-mentioned gradient stress-type fish fat reduction and deodorization aquaculture system and method to overcome the defects of existing fish aquaculture, such as single water flow, poor fat reduction and deodorization effect, uneven dissolved oxygen in the water, and easy accumulation of dirt at the bottom of the pond. It aims to improve the fat reduction and deodorization quality of fish by setting up gradient circulation, ozone pre-purification, bottom distributed oxygenation and intelligent self-controlled sewage discharge structure, and realize intelligent and stable operation of the aquaculture process.

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a gradient stress-type fish fat reduction and deodorization aquaculture system according to the present invention; Figure 2 This is a schematic diagram of the dynamic dissolved oxygen supply component in a gradient stress-induced fat reduction and deodorization aquaculture system for hanging fish according to the present invention; Figure 3 This is a schematic diagram of the automatic sewage discharge component in a gradient stress-type fish fat reduction and deodorization aquaculture system of the present invention; Figure 4 This is a connection block diagram of the main control terminal in a gradient stress-induced fat reduction and deodorization aquaculture system for hanging fish according to the present invention. Figure 5 This is a schematic diagram of the aquaculture method of a gradient stress-type fish fat reduction and deodorization aquaculture system according to the present invention.

[0017] Figure Labels 1. Enclosed constant-temperature aquaculture plant; 2. Circular closed-loop aquaculture pond; 21. Leak-proof and corrosion-resistant lining; 3. Variable flow drive assembly; 31. Variable frequency water circulation pump; 32. Flow regulating valve; 33. Distributed guide plate; 34. Inlet valve; 4. Dynamic dissolved oxygen supply assembly; 41. Variable frequency aeration fan; 42. Main air supply pipeline; 43. Branch air pipe; 44. Nanoporous aeration disc; 45. Electrical control box; 5. Multi-stage water purification assembly; 51. Outlet valve; 6. Intelligent monitoring and control. Components; 61. Multi-parameter water quality sensor; 62. Water temperature sensor; 63. Flow rate sensor; 64. Water level monitoring sensor; 65. Turbidity sensor; 66. Main control terminal; 67. Audible and visual alarm; 7. Automatic sewage discharge assembly; 71. Bottom sewage collection tank; 72. Inclined guide slope; 73. Sewage discharge suction pipe; 74. Electric timed sewage pump; 75. Electromagnetic sewage discharge valve; 76. Sludge storage box; 77. Return filter screen; 8. External water supply pipeline; 9. Ozone generator. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0020] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] Example 1 like Figures 1-5 As shown, this invention discloses a gradient stress-based fat reduction and deodorization aquaculture system for suspended fish, comprising a closed-loop constant-temperature aquaculture plant 1, a circular closed-loop aquaculture pond 2, a gradient water flow drive component 3, a dynamic dissolved oxygen supply component 4, a multi-stage water purification component 5, an intelligent monitoring and control component 6, an automatic sewage discharge component 7, an external water supply pipeline 8, and an ozone generator 9. The circular closed-loop aquaculture pond 2 is located inside the closed-loop constant-temperature aquaculture plant 1. The temperature control range inside the closed-loop constant-temperature aquaculture plant 1 is 18-26℃, which can isolate external temperature fluctuations, dust, pollutants, and biological interference, providing a stable and sealed environment for suspended fish aquaculture. The circumference of a single ring of the circular closed-loop aquaculture pond 2 is set to 12-18m, with an effective water depth of 1.2-1.6m.

[0022] The inner wall of the circular closed-loop aquaculture pond 2 is lined with a 2-3mm thick anti-seepage and anti-corrosion lining 21, which can effectively prevent the aquaculture water from leaking out, while avoiding water corrosion of the pond structure, thus improving the service life of the equipment and the cleanliness of the aquaculture environment.

[0023] The gradient water flow drive component 3 and the multi-stage water purification component 5 are respectively connected to the annular closed-loop aquaculture tank 2 via pipelines. The gradient water flow drive component 3, the annular closed-loop aquaculture tank 2, and the multi-stage water purification component 5 are connected to form the main water circulation circuit. The total volume of water in a single cycle is controlled at 8-12m³. 3 / h, to achieve continuous circulation and purification of aquaculture water.

[0024] The dynamic dissolved oxygen supply component 4 is installed at the bottom of the annular closed-loop aquaculture pond 2 and connected to the air passage of the pond 2. Its full-coverage installation allows for uniform oxygen supply from the bottom of the water body, solving the problems of uneven dissolved oxygen at the surface and oxygen deficiency at the bottom, thus meeting the needs for balanced dissolved oxygen throughout the pond. The automatic sewage discharge component 7 is arranged along the bottom of the annular closed-loop aquaculture pond 2 and connected to the bottom pipes. It relies on gravity to automatically collect and discharge waste, eliminating the need for manual pond cleaning and meeting the sewage discharge requirements of long-term continuous suspended aquaculture.

[0025] An external water supply pipe 8 connects to a multi-stage water purification component 5 to replenish the system with aquaculture water. An ozone generator 9 is located between the external water supply pipe 8 and the multi-stage water purification component 5 and is connected to the multi-stage water purification component 5. The ozone output concentration is set to 8-12 mg / L, which can perform ozone pre-oxidation purification on the replenished water, effectively degrading azotoxins and fish medicine residues in the water and killing pathogens.

[0026] The intelligent monitoring and control component 6 is installed inside the enclosed, constant-temperature aquaculture plant 1, without occupying space in the aquaculture ponds. The intelligent monitoring and control component 6 is electrically connected to the gradient water flow drive component 3, the dynamic dissolved oxygen supply component 4, and the automatic sewage discharge component 7. The signal acquisition frequency is set to 1 time / second, enabling real-time acquisition of operating parameters for each component and the issuance of control, start / stop, and early warning commands. This achieves centralized intelligent management of all equipment, replacing the existing extensive operation and maintenance mode characterized by manual control, poor parameter accuracy, and strong lag.

[0027] The variable flow drive component 3 includes a variable frequency water circulation pump 31, a flow regulating valve 32, a distributed guide plate 33, and an inlet valve 34. The multi-stage water purification component 5 is equipped with an outlet valve 51. The variable frequency water circulation pump 31 is a 0.75-1.5kW variable frequency pump, and its inlet end is connected to the purified water output end of the multi-stage water purification component 5 through a pipeline. One end of the variable frequency water circulation pump 31 is connected to the multi-stage water purification component 5, and the other end of the variable frequency water circulation pump 31 is connected to the annular closed-loop aquaculture tank 2 in sequence through the flow regulating valve 32 and the inlet valve 34. The annular closed-loop aquaculture tank 2 is reconnected to the multi-stage water purification component 5 through the outlet valve 51 pipeline. By adjusting the opening of the flow regulating valve 32 (0-100% stepless adjustment) and the operating frequency of the variable frequency water circulation pump 31 (20-50Hz), and with the diversion and guiding effect of the distributed guide plate 33, a gradient circulating water flow of 0.1-0.5m / s alternating fast and slow can be formed inside the annular closed-loop aquaculture pond 2, continuously forcing fish to swim and metabolize excess fat.

[0028] The dynamic dissolved oxygen supply component 4 includes a variable frequency aeration fan 41, a main air supply pipe 42, a branch air pipe 43, a nanoporous aeration disc 44, and an electrical control box 45. The variable frequency aeration fan 41 is a 0.55-1.1kW variable frequency fan. The variable frequency aeration fan 41 is connected to the nanoporous aeration disc 44 at the bottom of the annular closed-loop aquaculture pond 2 via the main air supply pipe 42 and the branch air pipe 43. The pore size of the nanoporous aeration disc 44 is set to 20-50μm to achieve uniform microbubble aeration throughout the pond bottom. The electrical control box 45 is electrically connected to the main control terminal 66 and can receive the control signals from the main control terminal 66 to adjust the speed and air supply of the variable frequency aeration fan 41 in real time, so as to maintain the dissolved oxygen in the water at the optimal range of 5-8mg / L, avoiding excessively high or low dissolved oxygen levels that would affect the quality of fish farming.

[0029] The automatic sewage discharge assembly 7 includes a bottom sewage collection trough 71, an inclined guide slope 72, a sewage suction pipe 73, an electric timed sewage pump 74, an electromagnetic sewage valve 75, a sewage storage box 76, and a return filter screen 77. The inclined guide slope 72 is symmetrically arranged on both sides of the bottom sewage collection trough 71 and is located at the bottom of the annular closed-loop aquaculture pond 2. The slope is set to 3-5° and is installed to fit the bottom of the annular closed-loop aquaculture pond 2. The bottom of the pond forms a stable guide structure with a low middle and high sides. The bottom sewage collection trough 71 is 15-20cm wide. The bottom sewage collection trough 71 has a pipe opening that connects to the annular closed-loop aquaculture pond 2 and is equipped with a return filter screen 77, which can effectively intercept large pieces of uneaten feed and fecal solid impurities, allowing only sewage and fine flocculent matter to pass through, preventing pipe blockage. The bottom sludge collection tank 71 is connected in sequence to the electromagnetic sludge discharge valve 75 and the electric timed sludge discharge pump 74 via the sludge suction pipe 73, and then connected to the sludge temporary storage box 76 to form an independent automatic sludge discharge branch. It can extract the sludge deposited at the bottom of the tank in a timed and quantitative manner, realizing unmanned sludge discharge operation and maintenance.

[0030] The intelligent monitoring and control component 6 includes a multi-parameter water quality sensor 61, a water temperature sensor 62, a flow velocity sensor 63, a water level monitoring sensor 64, a turbidity sensor 65, a main control terminal 66, and an audible and visual alarm 67. The multi-parameter water quality sensor 61, water temperature sensor 62, flow velocity sensor 63, water level monitoring sensor 64, and turbidity sensor 65 are all fixedly installed at different water depths inside the annular closed-loop aquaculture pond 2 to comprehensively collect real-time parameters such as dissolved oxygen, pH, water temperature, water flow velocity, water level, and turbidity. The detection accuracy reaches: dissolved oxygen ±0.1mg / L, water temperature ±0.1℃, flow velocity ±0.01m / s, water level ±1mm, and turbidity ±1NTU. All sensors are electrically connected to the main control terminal 66 via signal lines to achieve real-time data upload.

[0031] Multi-parameter water quality sensor 61, water temperature sensor 62, flow velocity sensor 63, water level monitoring sensor 64, and turbidity sensor 65 are all placed inside the annular closed-loop aquaculture tank 2 and electrically connected to the main control terminal 66. The main control terminal 66 is electrically connected to the variable frequency water circulation pump 31, the electrical control regulating box 45, the electric timed sewage pump 74, the electromagnetic sewage valve 75, and the audible and visual alarm 67. The main control terminal 66 has built-in preset aquaculture parameter thresholds: water temperature 18-26℃, dissolved oxygen 5-8mg / L, turbidity not greater than 30NTU, and water level fluctuation not greater than 5cm. It can automatically adjust the operation of each device according to the sensor feedback data. When any parameter exceeds the standard or equipment malfunctions, the audible and visual alarm 67 is automatically triggered to issue an audible and visual warning, realizing full-process intelligent monitoring and fault warning.

[0032] The ozone generator 9 is connected at both ends to the external water supply pipe 8 and the multi-stage water purification component 5, respectively. The output pipe of the ozone generator 9 is connected to the inside of the multi-stage water purification component 5. The ozone dosage is controlled at 0.3-0.5 mg / L, and the oxidation pretreatment time is not less than 3 minutes. After the ozone oxidation pretreatment is completed, the ozone is fed into the multi-stage water purification component 5. Through the strong oxidizing effect of ozone, the soily substances and residual fish medicines in the water are efficiently degraded, and pathogenic bacteria in the water are killed.

[0033] A method for raising fish using a gradient stress-induced fat reduction and deodorization aquaculture system includes the following steps: Step S1: Water replenishment and purification stage; The clean water required for aquaculture is sent to the ozone generator 9 through the external water replenishment pipeline 8. The ozone generator 9 produces ozone with a concentration of 8-12 mg / L, which is simultaneously introduced into the multi-stage water purification component 5 to complete water pretreatment, including pre-disinfection, deodorization, and reduction of drug residues. The water level monitoring sensor 64 monitors the water level in the annular closed-loop aquaculture pond 2 in real time, and continuously replenishes water when the water level is insufficient. When the water level is lower than the preset threshold of 1.2m, the system automatically and continuously replenishes water, and stops replenishing water when the water level reaches the standard of 1.6m, maintaining a stable aquaculture water volume.

[0034] Step S2, Gradient Water Circulation Stage: The variable frequency water circulation pump 31 draws purified water from the multi-stage water purification component 5 and sends it into the annular closed-loop aquaculture pond 2. The water flows through the distributed guide plate 33 to form a gradient circulation, creating a dynamically adjustable gradient circulation of 0.1-0.5 m / s within the pond. This continuously drives the fish to swim autonomously, accelerating the metabolism of excess fat in their bodies. The aquaculture water completes a full pond circulation every 30-45 minutes. The pond water flows back to the multi-stage water purification component 5 through the outlet valve 51 for circulation. The main control terminal 66 adjusts the operating status of the variable frequency water circulation pump 31 based on data collected by the flow velocity sensor 63, dynamically controlling the operating frequency of the variable frequency water circulation pump 31 and precisely adjusting the gradient water flow intensity to adapt to the fat reduction needs of different types and sizes of fish.

[0035] Step S3, Bottom-level Dynamic Oxygenation Stage: The variable frequency aeration blower 41 delivers gas to the nanoporous aeration discs 44 at the bottom of the annular closed-loop aquaculture pond 2 via the main air supply pipe 42 and branch air pipes 43. Finally, 20-50μm microbubbles are released through the nanoporous aeration discs 44 at the bottom of the annular closed-loop aquaculture pond 2, achieving uniform oxygenation at the bottom of the water body. The main control terminal 66, combined with dissolved oxygen data from the multi-parameter water quality sensor 61, adjusts the air supply of the variable frequency aeration blower 41 via the electrical control regulating box 45. When dissolved oxygen is below 5mg / L, the blower power is increased; when it is above 8mg / L, the blower power is decreased, dynamically adjusting the air supply of the variable frequency aeration blower 41 to always maintain the dissolved oxygen in the optimal aquaculture range of 5-8mg / L.

[0036] Step S4, Monitoring and Early Warning Stage: Throughout the aquaculture process, multi-parameter water quality sensors 61, 62, and 65 collect water quality data in real time at a frequency of 1 time / second and transmit it to the main control terminal 66. When water quality exceeds standards or equipment malfunctions, the main control terminal 66 activates the audible and visual alarm 67 to issue an audible and visual alarm. When abnormal conditions occur, such as water temperature exceeding 18-26℃, turbidity greater than 30 NTU, abnormal dissolved oxygen, or equipment malfunction, the audible and visual alarm 67 is immediately activated, continuously issuing audible and visual alarm signals to remind maintenance personnel to promptly investigate and repair, ensuring a stable and controllable aquaculture process.

[0037] Step S5, Automatic Sewage Discharge Stage: The system's automatic sewage discharge cycle is set to 12 hours / time. Sewage in the annular closed-loop aquaculture pond 2 flows along a 3-5° inclined guide slope 72 into the bottom sewage collection tank 71. The return filter screen 77 intercepts solid impurities to prevent clogging of pipes and pumps. The main control terminal 66 periodically starts the electric timed sewage pump 74 and the electromagnetic sewage discharge valve 75 to pump the sewage in the bottom sewage collection tank 71 into the sewage temporary storage tank 76. The sewage in the sewage temporary storage tank 76 is periodically discharged, realizing fully automatic sewage discharge without manual intervention during the aquaculture process.

[0038] Therefore, the present invention adopts the above-mentioned gradient stress-type fish fat reduction and deodorization aquaculture system and method, which adopts a ring gradient water flow, ozone pre-purification, full-area oxygenation at the bottom of the pond and intelligent linkage control structure, effectively optimizes the water environment, enhances the fat reduction and deodorization effect of fish, and realizes fully automatic sewage discharge and fault early warning.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention; and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A gradient stress-based fat reduction and deodorization aquaculture system for hanging fish, characterized in that, The system includes a closed-loop constant-temperature aquaculture facility, a circular closed-loop aquaculture tank, a gradient water flow drive component, a dynamic dissolved oxygen supply component, a multi-stage water purification component, an intelligent monitoring and control component, an automatic sewage discharge component, an external water supply pipeline, and an ozone generator. The circular closed-loop aquaculture tank is located inside the closed-loop constant-temperature aquaculture facility, with a seepage-proof and corrosion-resistant lining on its inner wall. The gradient water flow drive component and the multi-stage water purification component are connected to the circular closed-loop aquaculture tank via pipelines. The gradient water flow drive component, the circular closed-loop aquaculture tank, and the multi-stage water purification component are interconnected to form the main water circulation channel. The dynamic dissolved oxygen supply component is located at the bottom of the circular closed-loop aquaculture tank and is connected to the tank's air supply channel. The automatic sewage discharge component is arranged along the bottom of the circular closed-loop aquaculture tank and is connected to the bottom pipeline of the tank. The external water supply pipeline is connected to the multi-stage water purification component, and the ozone generator is located between the external water supply pipeline and the multi-stage water purification component and is connected to the multi-stage water purification component.

2. The gradient stress-based fat reduction and deodorization aquaculture system for suspended fish according to claim 1, characterized in that, The intelligent monitoring and control components are installed in the closed, constant-temperature aquaculture plant. The intelligent monitoring and control components are electrically connected to the gradient water flow drive components, the dynamic dissolved oxygen supply components, and the automatic sewage discharge components.

3. The gradient stress-based fat reduction and deodorization aquaculture system for suspended-water fish according to claim 2, characterized in that, The variable flow drive component includes a variable frequency water circulation pump, a flow regulating valve, a distributed guide plate, and an inlet valve. The multi-stage water purification component is equipped with an outlet valve. One end of the variable frequency water circulation pump is connected to the multi-stage water purification component, and the other end of the variable frequency water circulation pump is connected to the annular closed-loop aquaculture tank in sequence through the flow regulating valve and the inlet valve. The annular closed-loop aquaculture tank is reconnected to the multi-stage water purification component through the outlet valve pipeline.

4. The gradient stress-based fat reduction and deodorization aquaculture system for suspended fish according to claim 3, characterized in that, The dynamic dissolved oxygen supply component includes a variable frequency aeration blower, a main air supply pipeline, branch air pipes, a nanoporous aeration disc, and an electrical control box. The variable frequency aeration blower is connected to the nanoporous aeration disc at the bottom of the annular closed-loop aquaculture pond via the main air supply pipeline and branch air pipes. The electrical control box is electrically connected to the main control terminal.

5. The gradient stress-based fat reduction and deodorization aquaculture system for suspended fish according to claim 4, characterized in that, The automatic sewage discharge assembly includes a bottom sewage collection trough, an inclined guide slope, a sewage suction pipe, an electric timed sewage pump, an electromagnetic sewage valve, a sewage storage box, and a return filter screen. The inclined guide slope is symmetrically arranged on both sides of the bottom sewage collection trough and is located at the bottom of the annular closed-loop aquaculture pond. The bottom sewage collection trough has a pipe opening that connects to the annular closed-loop aquaculture pond and is equipped with a return filter screen. The bottom sewage collection trough is connected to the electromagnetic sewage valve and the electric timed sewage pump in sequence through the sewage suction pipe and then connected to the sewage storage box.

6. The gradient stress-based fat reduction and deodorization aquaculture system for suspended fish according to claim 5, characterized in that, The intelligent monitoring and control components include a multi-parameter water quality sensor, a water temperature sensor, a flow velocity sensor, a water level monitoring sensor, a turbidity sensor, a main control terminal, and an audible and visual alarm. The multi-parameter water quality sensor, water temperature sensor, flow velocity sensor, water level monitoring sensor, and turbidity sensor are all placed inside the annular closed-loop aquaculture pond and electrically connected to the main control terminal. The main control terminal is electrically connected to a variable frequency water circulation pump, an electrical control regulating box, an electric timed sewage pump, an electromagnetic sewage valve, and an audible and visual alarm.

7. The gradient stress-based fat reduction and deodorization aquaculture system for suspended-water fish according to claim 6, characterized in that, The ozone generator is connected to an external water supply pipeline and a multi-stage water purification component at both ends, and the ozone generator output pipeline is connected to the inside of the multi-stage water purification component.

8. The method for raising fish using a gradient stress-induced fat reduction and deodorization aquaculture system according to claim 7, characterized in that, Includes the following steps: Step S1, Water replenishment and purification stage: Water source is sent to ozone generator through external water replenishment pipeline. Ozone generated by ozone generator is simultaneously introduced into multi-stage water quality purification components to complete water pretreatment. Water level monitoring sensor monitors the water level in the annular closed-loop aquaculture pond in real time. Water is continuously replenished when the water level is insufficient. Step S2, Gradient Water Circulation Stage: The variable frequency water circulation pump draws purified water from the multi-stage water purification components and sends it into the annular closed-loop aquaculture pond. The water flows through the distributed guide plate to form a gradient circulation. The pond water flows back to the multi-stage water purification components through the outlet valve for circulation. The main control terminal adjusts the operation status of the variable frequency water circulation pump based on the data collected by the flow velocity sensor. Step S3, bottom dynamic oxygenation stage; the variable frequency aeration blower delivers gas to the nanoporous aeration discs at the bottom of the annular closed-loop aquaculture pond through the main air supply pipe and branch air pipes. The main control terminal adjusts the air supply of the variable frequency aeration blower through the electric control adjustment box based on dissolved oxygen data from multi-parameter water quality sensors. Step S4, Monitoring and Early Warning Stage: Multi-parameter water quality sensors, water temperature sensors, and turbidity sensors collect water quality data in real time and transmit it to the main control terminal. When water quality exceeds the standard or equipment malfunctions, the main control terminal activates the audible and visual alarm to issue an audible and visual alarm. Step S5, Automatic Sewage Discharge Stage: Sewage in the circular closed-loop aquaculture pond flows along the inclined guide slope into the bottom sludge collection tank. The return filter screen traps solid impurities. The main control terminal periodically activates the electric timed sewage pump and electromagnetic sewage valve to pump the sewage in the bottom sludge collection tank into the sewage temporary storage tank. The sewage in the sewage temporary storage tank is periodically discharged.

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