Grazing type culture method for filter feeding fishes in large reservoir

Abstract

The invention relates to the technical field of filter-feeding fish culture, and discloses a grazing type culture method for filter-feeding fishes in a large reservoir, comprising a mounting unit, a transmission unit and a fishing unit, the mounting unit comprises a fence body, and a gate is arranged in an inner cavity of the fence body; a first fishing fence body and a second fishing fence body are arranged in the fence body on the two sides of the gate respectively; the fishing unit comprises two concentric-square-shaped fixing plates. According to the fence, when a sliding block in the electric sliding rail moves, a fixing plate can be driven to move, the second fence door and the first fence door can be opened through the fixing plate, and meanwhile when the fixing plate moves to a certain position, the second fence door can be closed, and then the first fence door can be closed; therefore, filter-feeding fishes can enter the first fishing fence body, and meanwhile, when the filter-feeding fishes need to be fished, a worker can lift the first fishing fence body through the lifting device, so that the filter-feeding fishes are fished.

Description

Technical Field

[0001] The present invention belongs to the technical field of filter-feeding fish farming, and specifically relates to a grazing fish farming method for filter-feeding fish in large reservoirs. Background Art

[0002] With the increasing intensity of environmental protection in China and the emphasis on the protection of large water areas such as reservoirs and lakes, aquaculture facilities such as cages and fences have been removed from the waters of many reservoirs, lakes, etc. Although cage and fence feeding aquaculture does not cause as serious eutrophication hazards to water quality as traditional fertilization fish farming, with the passage of aquaculture time, such aquaculture methods will also cause the original water transparency to gradually decrease, showing a trend of eutrophication, that is, the nutrients in the water will increase. And when the water body is eutrophic to a certain extent, cyanobacteria pollution will break out. Moreover, some waters will also be affected by industry, agriculture and people's lives, and will be more likely to evolve towards an algae-type water body. Therefore, the eutrophication of large water areas is a serious problem and is not easy to control. To ensure the water quality in the water area, removing aquaculture facilities such as cages and fences to prohibit artificial feeding aquaculture is the most direct means.

[0003] However, when the existing fences enclose filter-feeding fish, the swimming trajectories of the filter-feeding fish are often uncertain, which easily disrupts the ecological balance of the area. Therefore, some existing fences are often divided into several foraging areas to allow filter-feeding fish to enter each foraging area separately to forage. However, when existing fish enter the next foraging area from one foraging area, at this time, the gates of the two foraging areas need to be opened simultaneously to allow the filter-feeding fish to enter the next foraging area. However, although this can allow fish to enter different foraging areas to forage, when fishing for filter-feeding fish, it is more troublesome, and it is necessary to use other equipment to fish for filter-feeding fish one by one or in groups, resulting in low fishing efficiency.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: A grazing fish farming method for filter-feeding fish in large reservoirs, including an installation unit, a transmission unit and a fishing unit. The installation unit includes a fence body, a gate is arranged in the inner cavity of the fence body, and a first fishing fence body and a second fishing fence body are respectively arranged in the fence body on both sides of the gate; The fishing unit includes two circular fixing plates, and the two circular fixing plates are respectively arranged on the inner walls above the first fishing fence body and the second fishing fence body; The transmission unit includes two electric slide rails, which are respectively arranged on the opposite side walls of the fence body, and the two electric slide rails are symmetrical to each other.

[0006] As a preferred embodiment of the present invention, a first installation notch is opened at the bottom of the gate, a rectangular notch is opened above the first installation notch, the rectangular notch penetrates through the gate movably, placing notches are opened on both sides of the gate at the rectangular notch, sliding notches are opened on the gate on the opposite side walls of the two placing notches, the two sliding notches are symmetrical to each other, and moving notches are also opened on the gate on the opposite side walls of the two sliding notches, the two moving notches penetrate through the gate movably respectively, sliding notches are opened on the gate at the opposite ends of the two moving notches, and positioning notches are opened on the gate at the opposite ends of the two sliding notches.

[0007] As a preferred embodiment of the present invention, the two electric slide rails penetrate through the inner cavity of the moving notch movably respectively, wedge-shaped plates are arranged on the opposite sides of the two moving notches, the two wedge-shaped plates are symmetrical to each other, the two wedge-shaped plates are respectively arranged in the sliding notch movably, and positioning blocks are fixedly connected to the opposite ends of the two wedge-shaped plates.

[0008] As a preferred embodiment of the present invention, fixing plates are also slidably arranged above the two electric slide rails, fishing luring plates are slidably arranged at the bottoms of the two electric slide rails, and the two fixing plates penetrate through the sliding notch and the positioning notch movably respectively.

[0009] As a preferred embodiment of the present invention, sliding mechanisms are arranged on the opposite side walls of the inner cavity of the sliding notch for the two wedge-shaped plates respectively, the sliding mechanism includes four moving chutes, the four moving chutes are respectively opened on the opposite side walls of the inner cavity of the two sliding notches, each moving chute is symmetrical to each other, a moving slider is slidably arranged in each moving chute inner cavity, each pair of the moving sliders is symmetrical to each other, each pair of the moving sliders is arranged on the wedge-shaped plate, a return spring is arranged on each moving slider, and the other end of the return spring is arranged on the moving chute.

[0010] As a preferred embodiment of the present invention, a first gate is arranged in the inner cavity of the first installation notch, mounting blocks are fixedly connected to the opposite side walls above the first gate, the two mounting blocks are symmetrical to each other, fixing rods are respectively arranged above the two mounting blocks, the two fixing rods are symmetrical to each other, swing arms are respectively arranged at the opposite ends of the two fixing rods movably, the two swing arms are symmetrical to each other, and the other ends of the two swing arms are respectively arranged on the positioning blocks movably.

[0011] As a preferred embodiment of the present invention, two symmetrically arranged guide rods are fixedly connected inside each of the two positioning notches. A trapezoidal plate is arranged between every two of the four guide rods. The two trapezoidal plates are symmetric to each other. Above the four guide rods is a top plate.

[0012] As a preferred embodiment of the present invention, second installation notches are provided on both the first fishing fence body and the second fishing fence body. Notches are provided above the two second installation notches. A second gate is movably arranged inside the notch cavity. The two second gates are respectively fitted and arranged inside the second installation notches. Above the two second gates are provided a plurality of connecting rods arranged at equal intervals.

[0013] As a preferred embodiment of the present invention, two placing blocks are slidably arranged above each of the two trapezoidal plates. The four placing blocks are symmetric to each other in pairs. Above the four placing blocks are fixedly connected with mounting rods. Connecting rods are arranged at the opposite ends of every two of the four mounting rods. Connecting rods are respectively arranged at the bottoms of the two connecting rods.

[0014] As a preferred embodiment of the present invention, two symmetrically arranged mounting brackets are vertically slidably arranged at the opposite ends of the two connecting rods. At the bottoms of the four mounting brackets are provided a plurality of moving rods arranged at equal intervals. Each moving rod respectively passes through the loop-shaped fixing plate movably, and a driving plate is arranged at the bottom of the moving rod.

[0015] The present invention has the following beneficial effects compared with the prior art: In the present invention, first, when the filter-feeding fish stay in the second fishing fence body for a long time, at this time, the staff starts the fish attracting board and the electric slide rail, so that the fish attracting board can move towards the first fishing fence body. When the slider inside the electric slide rail moves, it can also drive the fixing plate to move. Through the fixing plate, the second gate can be opened and the first gate can be opened. At the same time, when the fixing plate moves to a certain position, the second gate can be closed and then the first gate can be closed. Therefore, the filter-feeding fish can enter the first fishing fence body. At the same time, when it is necessary to catch the filter-feeding fish, at this time, the staff can lift the first fishing fence body through the lifting device, so as to catch the filter-feeding fish, thus ensuring that the filter-feeding fish in the whole area can be caught and ensuring the fishing efficiency.

[0016] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the drawings: Figure 1 It is a three-dimensional structural schematic diagram of a grazing aquaculture method for filter-feeding fish in a large reservoir; Figure 2 Schematic diagram of the inner cavity structure of the fence body for a grazing aquaculture method for filter-feeding fish in large reservoirs; Figure 3 Schematic diagram of the gate structure for a grazing aquaculture method for filter-feeding fish in large reservoirs; Figure 4 Schematic sectional view of the gate structure for a grazing aquaculture method for filter-feeding fish in large reservoirs; Figure 5 For a grazing aquaculture method for filter-feeding fish in large reservoirs Figure 4 Enlarged structure schematic diagram at position A; Figure 6 Schematic diagram of the inner cavity structure of the gate for a grazing aquaculture method for filter-feeding fish in large reservoirs; Figure 7 Schematic diagram of the structure of the second gate for a grazing aquaculture method for filter-feeding fish in large reservoirs; Figure 8 Schematic side view of the second gate for a grazing aquaculture method for filter-feeding fish in large reservoirs.

[0018] In the figure: 100, installation unit; 101, fence body; 102, gate; 1021, rectangular notch; 1022, placement notch; 1023, moving notch; 1024, sliding notch; 1025, positioning notch; 1026, first installation notch; 1027, sliding notch; 103, first fishing fence body; 1031, second fishing fence body; 1032, loop-shaped fixing plate; 1033, second installation notch; 104, first gate; 1041, fixing rod; 1042, installation block; 200, transmission unit; 201, electric slide rail; 2011, fixing plate; 2012, fish attracting plate; 202, moving chute; 2021, moving slider; 2022, return spring; 2023, wedge-shaped plate; 2024, positioning block; 2025, swing arm; 300, fishing unit; 301, trapezoidal plate; 3011, guide rod; 3012, top plate; 302, placement block; 3021, installation rod; 3022, connecting rod; 3023, connecting link; 3024, second gate; 303, installation bracket; 3031, moving rod; 3032, driving plate. Detailed implementation method

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0020] Example 1:

[0021] As Figures 1 to 8 shown, a grazing aquaculture method for filter-feeding fish in large reservoirs includes an installation unit 100, a transmission unit 200, and a fishing unit 300. The installation unit 100 includes a fence body 101, and a gate 102 is arranged inside the fence body 101. A first fishing fence body 103 and a second fishing fence body 1031 are respectively arranged in the fence body 101 on both sides of the gate 102; the fishing unit 300 includes two U-shaped fixing plates 1032, and the two U-shaped fixing plates 1032 are respectively arranged on the inner walls above the first fishing fence body 103 and the second fishing fence body 1031; the transmission unit 200 includes two electric slide rails 201, and the two electric slide rails 201 are respectively arranged on the opposite side walls of the fence body 101, and the two electric slide rails 201 are symmetric to each other. First, when the filter-feeding fish stay in the second fishing fence body 1031 for a long time, at this time, the staff starts the fish attracting board 2012 and the electric slide rail 201, so that the fish attracting board 2012 can move towards the first fishing fence body 103. When the slider in the electric slide rail 201 moves, it can also drive the fixing plate 2011 to move. Through the fixing plate 2011, the second gate 3024 can be opened and the first gate 104 can be opened. At the same time, when the fixing plate 2011 moves to a certain position, the second gate 3024 can be closed and then the first gate 104 can be closed. Therefore, the filter-feeding fish can enter the first fishing fence body 103. At the same time, when it is necessary to fish the filter-feeding fish, at this time, the staff can lift the first fishing fence body 103 through the lifting device, so as to fish the filter-feeding fish.

[0022] As Figures 1 to 5 shown, in the specific implementation, a first installation slot 1026 is opened at the bottom of the gate 102, a rectangular slot 1021 is opened above the first installation slot 1026, the rectangular slot 1021 penetrates through the gate 102 movably, placing slots 1022 are opened on both sides of the gate 102 at the rectangular slot 1021, sliding slots 1027 are opened on the opposite side walls of the two placing slots 1022 on the gate 102, the two sliding slots 1027 are symmetric to each other, and moving slots 1023 are also opened on the opposite side walls of the two sliding slots 1027 on the gate 102. The two moving slots 1023 respectively penetrate through the gate 102 movably, sliding slots 1024 are opened at the opposite ends of the two moving slots 1023 on the gate 102, and positioning slots 1025 are opened at the opposite ends of the two sliding slots 1024 on the gate 102. In this setting, the shape and components of the gate 102 are determined.

[0023] Example 2:

[0024] The difference between the above embodiment and this embodiment is as follows: As Figures 1 to 8 shown, in a grazing aquaculture method for filter-feeding fish in large reservoirs, two electric slide rails 201 respectively pass through the inner cavity of the moving notch 1023 movably. On the opposite sides of the two moving notches 1023, there are wedge-shaped plates 2023. The two wedge-shaped plates 2023 are symmetrical to each other. The two wedge-shaped plates 2023 are respectively arranged in the sliding notch 1027 movably. The opposite ends of the two wedge-shaped plates 2023 are fixedly connected with positioning blocks 2024. In this setting, the installation position of the wedge-shaped plate 2023 is determined.

[0025] As Figures 1 to 4 and Figures 6 to 7 shown, in the specific implementation, a fixed plate 2011 is also slidably arranged above the two electric slide rails 201, and a fish attracting plate 2012 is also slidably arranged at the bottom of the two electric slide rails 201. The two fixed plates 2011 respectively pass through the sliding notch 1024 and the positioning notch 1025 movably. In this setting, the position of the fish attracting plate 2012 is determined.

[0026] As Figures 1 to 6 shown, further, sliding mechanisms are arranged on the opposite side walls of the inner cavity of the sliding notch 1027 for the two wedge-shaped plates 2023 respectively. The sliding mechanism includes four moving chutes 202. The four moving chutes 202 are respectively opened on the opposite side walls of the inner cavity of the two sliding notches 1027. Each moving chute 202 is symmetrical to each other. A moving slider 2021 is slidably arranged in each moving chute 202. Each pair of the moving sliders 2021 is symmetrical to each other. Each pair of the moving sliders 2021 is arranged on the wedge-shaped plate 2023. A return spring 2022 is arranged on each moving slider 2021, and the other end of the return spring 2022 is arranged on the moving chute 202. In this setting, it is ensured that the wedge-shaped plate 2023 can move horizontally with the assistance of the moving chute 202 and the moving slider 2021.

[0027] Embodiment 3:

[0028] The difference between the above embodiment and this embodiment is as follows: As Figures 1 to 7As shown in the figure, a grazing aquaculture method for filter-feeding fish in large reservoirs. Inside the first installation notch 1026, there is a first gate 104. On the opposite two side walls above the first gate 104, there are fixedly connected mounting blocks 1042. The two mounting blocks 1042 are symmetrical to each other. Above the two mounting blocks 1042, there are respectively provided fixed rods 1041. The two fixed rods 1041 are symmetrical to each other. At the opposite ends of the two fixed rods 1041, there are respectively movably provided swing arms 2025. The two swing arms 2025 are symmetrical to each other. The other ends of the two swing arms 2025 are respectively movably provided on the positioning blocks 2024. In this setting, it is ensured that when the wedge-shaped plate 2023 moves to a certain position, at this time it can drive the positioning block 2024 to move horizontally. When the positioning block 2024 moves to a certain position, it can drive the swing arm 2025 to drive the fixed rod 1041 to move vertically upward.

[0029] As Figures 1 to 4 and Figures 6 to 8 shown in the figure, in the specific implementation manner, two symmetrically arranged guide rods 3011 are fixedly connected in each of the two positioning notches 1025. Between the four guide rods 3011 in pairs, there are trapezoidal plates 301. The two trapezoidal plates 301 are symmetrical to each other. Above the four guide rods 3011, there is a top plate 3012. In this setting, it is ensured that the trapezoidal plate 301 can move vertically.

[0030] As Figures 1 to 4 and Figures 6 to 8 shown in the figure, further, on both the first fishing fence body 103 and the second fishing fence body 1031, there are second installation notches 1033 opened. Above the two second installation notches 1033, there are notches opened. Inside the notch cavities, there are movably provided second gates 3024. The two second gates 3024 are respectively fitted and arranged in the second installation notches 1033. Above the two second gates 3024, there are provided a plurality of equally spaced connecting rods 3023. In this setting, the position of the second gate 3024 is determined.

[0031] As Figures 1 to 4 and Figures 6 to 8 shown in the figure, further, on both the two trapezoidal plates 301, there are slidably provided two placing blocks 302. The four placing blocks 302 are symmetrical to each other in pairs. Above the four placing blocks 302, there are fixedly connected mounting rods 3021. At the opposite ends of the four mounting rods 3021 in pairs, there are connecting rods 3022. At the bottom parts of the two connecting rods 3022, there are respectively provided connecting rods 3023. In this setting, the installation position and connection relationship of the connecting rod 3022 are determined.

[0032] As Figures 1 to 4 and Figures 6 to 8As shown in the figure, further, two symmetrically arranged mounting brackets 303 are vertically slidably provided at opposite ends of the two connecting rods 3022. A plurality of equally spaced moving rods 3031 are provided at the bottoms of the four mounting brackets 303. Each moving rod 3031 respectively passes through the loop-shaped fixing plate 1032 movably, and a driving plate 3032 is provided at the bottom of the moving rod 3031. In this setting, it is ensured that the staff can lift the mounting bracket 303 by means of a robotic arm or the like. Therefore, when the mounting bracket 303 moves to a certain position, it will be able to drive the driving plate 3032 to move vertically upward through the moving rod 3031. When the driving plate 3032 moves upward to a certain position, it will be able to drive the loop-shaped fixing plate 1032 to move upward, so that the first fishing fence body 103 can be driven to move vertically upward through the loop-shaped fixing plate 1032, and thus the first fishing fence body 103 can be taken out. Therefore, it is convenient to catch the filter-feeding fish in the first fishing fence body 103.

[0033] The implementation principle of a grazing aquaculture method for filter-feeding fish in large reservoirs in this embodiment is as follows: First, the staff places the filter-feeding fish into the second fishing fence body 1031 provided in the fence body 101. When it is necessary to change the feeding area of the second fishing fence body 1031, at this time, the staff starts the electric slide rail 201. Therefore, the electric slide rail 201 can drive the fixing plate 2011 to move. When the fixing plate 2011 moves to a certain position, the fixing plate 2011 can squeeze the trapezoidal plate 301 to move vertically upward with the assistance of the guide rod 3011. When the trapezoidal plate 301 moves upward, it will be able to drive the placing block 302 to move upward. When the placing block 302 moves upward, it will be able to drive the mounting rod 3021 to move vertically upward. When the mounting rod 3021 moves upward, it will be able to drive the connecting rod 3022 to move upward. When the connecting rod 3022 moves upward, it will be able to drive the connecting rod 3023 to move upward, and when the connecting rod 3023 moves upward, it will be able to drive the second gate 3024 to move vertically upward. Therefore, the second installation notch 1033 opened on the first fishing fence body 103 can be opened; When the fixed plate 2011 moves to a certain position, that is, when the fixed plate 2011 enters the moving notch 1023, at this time, the fixed plate 2011 presses on the inclined surface of the wedge plate 2023. Therefore, the wedge plate 2023 will be able to move horizontally with the assistance of the moving chute 202 and the moving slider 2021. When the wedge plate 2023 moves to a certain position, at this time, it can drive the positioning block 2024 to move horizontally. When the positioning block 2024 moves to a certain position, it can drive the swing arm 2025 to drive the fixed rod 1041 to move vertically upward (because the fixed rod 1041 is fixedly installed on the mounting block 1042, and the mounting block 1042 is fixedly installed on the first fence door 104. Therefore, it can drive the first fence door 104 to move vertically upward. Because the mounting block 1042 and the rectangular notch 1021 fit each other and are slidably arranged); When the first fence door 104 is opened, at this time, the electric slide rail 201 will be able to drive the fish attracting plate 2012 into the first fishing fence body 103. At the same time, when the electric slide rail 201 drives the fixed plate 2011 to continue to move a certain distance, it will be able to make the trapezoidal plate 301 fall down under the action of gravity, so that the second fence door 3024 is closed, so as to change the foraging environment of the filter-feeding fish; When it is necessary to catch the filter-feeding fish, at this time, the staff can lift the mounting bracket 303 through a robotic arm or the like (because the mounting bracket 303 is slidably arranged on the connecting rod 3022. Therefore, when lifting, the initial position of the mounting bracket 303 is located at the top of the inner cavity of the chute arranged on the connecting rod 3022. Therefore, it can make the connecting rod 3022 move together, ensuring that the second fence door 3024 will not open). Therefore, when the mounting bracket 303 moves to a certain position, it will be able to drive the driving plate 3032 to move vertically upward through the moving rod 3031. When the driving plate 3032 moves upward to a certain position, it will be able to drive the loop-shaped fixing plate 1032 to move upward, so that the first fishing fence body 103 can be driven to move vertically upward through the loop-shaped fixing plate 1032, so that the first fishing fence body 103 can be taken out, so as to facilitate catching the filter-feeding fish in the first fishing fence body 103.

[0034] First, when the filter-feeding fish stay in the second fishing fence body 1031 for a long time, the staff activates the fish attracting board 2012 and the electric slide rail 201 at this time, so that the fish attracting board 2012 can move towards the first fishing fence body 103. When the slider in the electric slide rail 201 moves, it can also drive the fixed plate 2011 to move. Through the fixed plate 2011, the second gate 3024 can be opened and the first gate 104 can be opened. At the same time, when the fixed plate 2011 moves to a certain position, the second gate 3024 can be closed and then the first gate 104 can be closed. Therefore, the filter-feeding fish can enter the first fishing fence body 103. At the same time, when it is necessary to catch the filter-feeding fish, the staff can lift the first fishing fence body 103 through the lifting device at this time, so as to catch the filter-feeding fish.

Claims

1. A grazing aquaculture method for filter-feeding fish in large reservoirs, comprising an installation unit (100), a transmission unit (200) and a fishing unit (300), characterized in that: The installation unit (100) includes a fence body (101), a gate (102) is arranged in the inner cavity of the fence body (101), and a first fishing fence body (103) and a second fishing fence body (1031) are arranged in the fence body (101) on both sides of the gate (102); The fishing unit (300) includes two U-shaped fixing plates (1032), and the two U-shaped fixing plates (1032) are respectively arranged on the inner walls above the first fishing fence body (103) and the second fishing fence body (1031); The transmission unit (200) includes two electric slide rails (201), and the two electric slide rails (201) are respectively arranged on the opposite side walls of the fence body (101), and the two electric slide rails (201) are symmetrical to each other.

2. The grazing aquaculture method for filter-feeding fish in large reservoirs according to claim 1, characterized in that A first installation notch (1026) is opened at the bottom of the gate (102), a rectangular notch (1021) is opened above the first installation notch (1026), the rectangular notch (1021) penetrates through the gate (102) movably, placement notches (1022) are opened on both sides of the gate (102) at the rectangular notch (1021), sliding notches (1027) are opened on the opposite side walls of the two placement notches (1022) on the gate (102), the two sliding notches (1027) are symmetrical to each other, and moving notches (1023) are also opened on the opposite side walls of the two sliding notches (1027) on the gate (102), the two moving notches (1023) penetrate through the gate (102) movably respectively, sliding notches (1024) are opened at the opposite ends of the two moving notches (1023) on the gate (102), and positioning notches (1025) are opened at the opposite ends of the two sliding notches (1024) on the gate (102).

3. The grazing aquaculture method for filter-feeding fish in large reservoirs according to claim 1, characterized in that, The two electric slide rails (201) penetrate through the inner cavities of the moving notches (1023) movably respectively, wedge-shaped plates (2023) are arranged on the opposite sides of the two moving notches (1023), the two wedge-shaped plates (2023) are symmetrical to each other, the two wedge-shaped plates (2023) are arranged in the sliding notches (1027) movably respectively, and positioning blocks (2024) are fixedly connected to the opposite ends of the two wedge-shaped plates (2023).

4. The grazing aquaculture method for filter-feeding fish in large reservoirs according to claim 3, characterized in that, Fixing plates (2011) are also slidably arranged above the two electric slide rails (201), fish attracting plates (2012) are slidably arranged at the bottoms of the two electric slide rails (201), and the two fixing plates (2011) penetrate through the sliding notches (1024) and the positioning notches (1025) movably respectively.

5. A grazing aquaculture method for filter-feeding fish in large reservoirs according to claim 3, characterized in that Two of the wedge plates (2023) are respectively provided with sliding mechanisms on the opposite side walls of the inner cavity of the sliding notch (1027). The sliding mechanism includes four moving chutes (202). The four moving chutes (202) are respectively opened on the opposite side walls of the inner cavity of the two sliding notches (1027). Each of the moving chutes (202) is symmetric with each other. A moving slider (2021) is slidably arranged in the inner cavity of each moving chute (202). Each pair of the moving sliders (2021) is symmetric with each other. Each pair of the moving sliders (2021) is arranged on the wedge plate (2023). A return spring (2022) is arranged on each of the moving sliders (2021), and the other end of the return spring (2022) is arranged on the moving chute (202).

6. A grazing aquaculture method for filter-feeding fish in large reservoirs according to claim 1, characterized in that, A first gate (104) is arranged in the inner cavity of the first installation notch (1026). Mounting blocks (1042) are fixedly connected to the opposite side walls above the first gate (104). The two mounting blocks (1042) are symmetric with each other. Fixing rods (1041) are respectively arranged above the two mounting blocks (1042). The two fixing rods (1041) are symmetric with each other. Swing arms (2025) are respectively movably arranged at the opposite ends of the two fixing rods (1041). The two swing arms (2025) are symmetric with each other. The other ends of the two swing arms (2025) are respectively movably arranged on the positioning blocks (2024).

7. A grazing aquaculture method for filter-feeding fish in large reservoirs according to claim 1, characterized in that, Two symmetric guide rods (3011) are fixedly connected in each of the two positioning notches (1025). A trapezoidal plate (301) is arranged between every two of the four guide rods (3011). The two trapezoidal plates (301) are symmetric with each other. A top plate (3012) is arranged above the four guide rods (3011).

8. A grazing aquaculture method for filter-feeding fish in large reservoirs according to claim 1, characterized in that, Second installation notches (1033) are opened on both the first fishing fence body (103) and the second fishing fence body (1031). Notches are opened above the two second installation notches (1033). A second gate (3024) is movably arranged in the inner cavity of the notch. The two second gates (3024) are respectively fitted in the second installation notches (1033). A plurality of equally spaced connecting rods (3023) are arranged above the two second gates (3024).

9. A grazing aquaculture method for filter-feeding fish in large reservoirs according to claim 7, characterized in that, Two placing blocks (302) are respectively slidably arranged above the two trapezoidal plates (301). The four placing blocks (302) are symmetric with each other in pairs. Mounting rods (3021) are fixedly connected above the four placing blocks (302). Connecting rods (3022) are arranged at the opposite ends of every two of the four mounting rods (3021). Connecting rods (3023) are respectively arranged at the bottoms of the two connecting rods (3022).

10. A grazing aquaculture method for filter-feeding fish in large reservoirs according to claim 9, characterized in that, Two symmetrically arranged mounting brackets (303) are vertically slidably provided at opposite ends of the two connecting rods (3022). A plurality of equally spaced moving rods (3031) are provided at the bottom of each of the four mounting brackets (303). Each moving rod (3031) respectively passes through the loop-shaped fixing plate (1032) movably, and a driving plate (3032) is provided at the bottom of the moving rod (3031).

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