A fishway light illumination fish luring test device

Abstract

This invention discloses a fishway illumination-based fish-attracting experimental device, belonging to the field of fish-attracting experimental technology. It includes: an experimental water tank, positioned above a reservoir, divided into an upstream, midstream, and downstream section, with an adaptation zone in the downstream section; a support frame erected above the midstream section, covered with a black cloth; and an illumination mechanism located on the upper wall of the midstream section, comprising LED lights and connecting components. Through the structural design of the connecting components, this invention allows for multi-dimensional flexible adjustment of the LED lights' horizontal position, illumination angle, and vertical height, breaking the limitations of fixed illumination modes in traditional experimental devices. The position and angle of the illumination can be adjusted according to experimental needs, and the adjustment operation is simple and convenient. It enables multi-parameter illumination research, allowing for quantitative study of the impact of different illumination conditions on fish migration behavior, meeting the needs of different experimental scenarios, and providing support for personalized fish-attracting research.

Description

Technical Field

[0001] This invention relates to the field of fish attraction testing technology, and more specifically, to a fishway light-induced fish attraction testing device. Background Technology

[0002] In water conservancy projects, fishways are crucial facilities for ensuring the passage of migratory fish, and their effectiveness in attracting fish directly determines their passage efficiency. Light, as an important environmental signal for fish migration, has parameters whose regulation directly influences the fishway's ability to attract fish and its passage efficiency.

[0003] However, when conducting fishway light-induced fish attraction experiments at present, traditional simple experimental devices are mostly fixed light modes, which cannot adjust the position and angle of the light according to the experimental needs. It is difficult to quantitatively study the influence of different light conditions on the migratory behavior of fish, making it difficult to formulate the optimal light-induced fish attraction program for specific fish species.

[0004] Therefore, it is necessary to provide a fishway light-induced fish attraction experimental device to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a fishway light-induced fish attraction experimental device to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A fishway light-induced fish-attracting experimental device includes a water storage tank and a water circulation system, and further includes: A test water tank is set above the water storage tank. The test water tank is divided into an upstream section, a midstream section and a downstream section, and an adaptation zone is provided in the downstream section. A support frame is erected above the midstream section, and a black cloth is laid on the support frame; A lighting mechanism is installed on the upper wall of the midstream section. The lighting mechanism includes LED lights and connecting components. The connecting components are used to adjust the position and angle of the LED lights.

[0007] Furthermore, the connecting component includes: Two support plates are connected to the inner wall of the test water tank, and a connecting column is installed between the two support plates. A sleeve is installed on the outside of the connecting column. The sleeve is equipped with an angle adjustment component and a displacement component. The displacement component is connected to the LED light. The angle adjustment component and the displacement component are used to drive the LED light to rotate and extend / retract, respectively.

[0008] Furthermore, the sleeve is slidably fitted onto the outer wall of the connecting column, and the outer wall of the connecting column has multiple sets of circumferentially arrayed limiting holes, and the outer wall of the sleeve is threaded with fastening bolts that are compatible with the limiting holes.

[0009] Furthermore, the angle adjustment component includes: A connecting plate is connected to the sleeve. The bottom of the connecting plate is provided with an arc-shaped rod and a connecting rod that is hinged to it. The bottom of the connecting rod is provided with a transition plate. A limiting element is provided on the connecting rod to limit the position of the connecting rod.

[0010] Furthermore, the limiting element includes: An elastic element has one end connected to the connecting rod and the other end provided with a pull plate. One end of the pull plate is provided with a limiting rod, and the other end of the limiting rod movably passes through the connecting rod. The arc-shaped rod has multiple insertion holes that are compatible with the connecting rod.

[0011] Furthermore, the shifting component includes: The upper end of the screw is rotatably connected to the bottom of the adapter plate, and the lower end is threadedly connected to the displacement cylinder. The bottom of the displacement cylinder is provided with a mounting plate that is detachably connected to the LED light. The mounting plate is provided with a stop bar that slides through the adapter plate.

[0012] Furthermore, a knob is provided on the outer wall of the screw.

[0013] Furthermore, the outer wall of the connecting column is provided with a plurality of positioning grooves corresponding to the limiting hole, and the width of the positioning grooves is greater than the inner diameter of the limiting hole.

[0014] Furthermore, both ends of the connecting column are provided with fixing holes, and the support plate is provided with fixing bolts that are threaded to the fixing holes.

[0015] Furthermore, the water circulation system includes a variable frequency water pump, the input and output ends of which are connected to the water storage tank and the test water tank respectively via water pipes.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the structural design of the connecting components, this invention enables flexible multi-dimensional adjustment of the horizontal position, illumination angle, and vertical height of the LED light, breaking the limitations of the fixed illumination mode of traditional experimental devices. The position and angle of the light can be adjusted according to experimental needs, and the adjustment operation is simple and convenient, without the need for complex control equipment, thus improving the efficiency of experimental operation. It can realize multi-parameter illumination research, quantitatively study the influence of different illumination conditions on fish migration behavior, provide experimental support for formulating optimal light-based fish attraction schemes for specific fish species, meet the needs of different experimental scenarios, and provide support for personalized fish attraction research.

[0017] 2. The experimental tank in this scheme is divided into an upstream section, a midstream section and a downstream section. The downstream section is set up as an adaptation zone to allow the experimental fish to adapt to the environment. It is also equipped with a water storage tank and a water circulation system to realize the recycling of water flow and create a controllable and realistic experimental environment. At the same time, the segmented design of the experimental tank facilitates the observation and recording of fish migration behavior in different areas, improving the detail of the experimental research.

[0018] 3. The illumination mechanism and the test water tank in this solution are connected in a detachable manner, which is convenient for disassembly and assembly. During later maintenance, damaged parts can be replaced in a targeted manner without the need for overall disassembly, thus reducing maintenance costs and workload. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall front view of the fish-attracting test device of the present invention; Figure 2 This is a schematic diagram of the illumination mechanism of the present invention from an upward viewing angle; Figure 3 This is a schematic diagram of the structure of each component on the connecting column of the present invention; Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a side view structural diagram of the arc-shaped rod and connecting rod in cross-section of the present invention.

[0020] Explanation of the labels in the diagram: 1. Water storage tank; 2. Test water tank; 3. Upstream section; 4. Midstream section; 5. Downstream section; 6. Adaptation zone; 7. Support frame; 8. Illumination mechanism; 9. LED light; 10. Support plate; 11. Connecting column; 12. Sleeve; 13. Angle adjustment assembly; 131. Connecting plate; 132. Arc rod; 133. Connecting rod; 134. Adapter plate; 135. Limiting component; 1351. Elastic component; 1352. Pull plate; 1353. Limiting rod; 136. Insertion hole; 14. Displacement assembly; 141. Screw; 142. Displacement cylinder; 143. Mounting plate; 144. Stop bar; 15. Limiting hole; 16. Fastening bolt; 17. Knob; 18. Positioning groove; 19. Fixing hole; 20. Variable frequency water pump. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1-5A fishway light-induced fish attraction experimental device includes a water storage tank 1 and a water circulation system, and further includes: The experimental tank 2 is located above the reservoir 1. The experimental tank 2 is made of transparent tempered glass, which facilitates the observation of the behavior of the experimental fish. The experimental tank 2 is divided into an upstream section 3, a midstream section 4 and a downstream section 5. An adaptation zone 6 is set up in the downstream section 5. The adaptation zone 6 allows the experimental fish to adapt to the environment first, avoiding the impact of environmental stress on the experimental data and improving the accuracy of the experimental results. Simulated aquatic plants and other coverings can also be laid in the adaptation zone 6 to provide an adaptation environment for the experimental fish. A support frame 7 is erected above the middle section 4, and a black cloth is laid on the support frame 7 to isolate external light interference in order to simulate the dark area of ​​the tunnel section. The illumination mechanism 8 is located on the upper wall of the middle section 4, that is, the light source is arranged in the area of ​​the test water tank 2 simulating the tunnel section. The illumination mechanism 8 includes LED lights 9 and connecting parts. The connecting parts are used to adjust the position and angle of the LED lights 9. The LED lights 9 provide a light source for the test, and their brightness and spectrum can be adjusted according to the test requirements.

[0023] Preparation before the experiment: After being caught by fishermen, the experimental fish were transported back to the experimental base in batches and temporarily held in tanks. They were starved for 48 hours before the experiment. The holding water was tap water that had been aerated for 48 hours beforehand. During this period, still water was used for holding, with continuous oxygenation 24 hours a day. Approximately half of the water was changed daily to maintain dissolved oxygen levels above 6.0 mg / L in the tanks.

[0024] Experimental steps: 1. Take two fish out of the temporary holding tank and put them into the adaptation zone 6 of the downstream section 5 of the test tank 2. Record the adaptation time, which is 20 minutes. Do not turn on the LED light 9 during the adaptation process.

[0025] 2. After the adaptation period, turn on the LED light 9 in the middle section 4, remove the barrier between the middle section 4 and the downstream section 5, and start the video recording to record the corresponding time. The experiment will then officially begin and last for 40 minutes.

[0026] 3. After the experiment, turn off the recording and record the time. Remove the experimental fish, replace them with the next group of experimental fish, and repeat the above steps. Perform 10 replicates for each condition, and record the fish's preferred behaviors on video.

[0027] Under different intensities of LED light 9, the distribution rate of experimental fish in three water areas (upstream section 3, midstream section 4 and downstream section 5) was compared to analyze the fish's preference for the three water areas under different light intensities. In addition, the migratory behavior of experimental fish under different light conditions was observed and recorded in different areas. The light parameters and water flow speed can be repeatedly adjusted according to the experimental needs to carry out multiple sets of comparative experiments.

[0028] This invention, through the structural design of the connecting components, enables flexible multi-dimensional adjustment of the horizontal position, illumination angle, and vertical height of the LED lamp 9. This breaks the limitations of the fixed illumination mode of traditional experimental devices, allowing the position and angle of the light to be adjusted according to experimental needs. This enables multi-parameter illumination research, and allows for quantitative study of the influence of different illumination conditions on fish migration behavior, providing experimental support for developing optimal light-attracting schemes for specific fish species.

[0029] In addition, the experimental tank 2 of this scheme is divided into upstream section 3, midstream section 4 and downstream section 5, and is equipped with a water storage tank 1 and a water circulation system to realize the recycling of water flow. At the same time, the segmented design of the experimental tank 2 facilitates the observation and recording of fish migration behavior in different areas, and improves the detail of the experimental research.

[0030] For preferred options, please refer to [link / reference]. Figure 2-5 The connecting components include: Two support plates 10 are connected to the inner wall of the test water tank 2, and a connecting column 11 is installed between the two support plates 10. A sleeve 12 is installed on the outside of the connecting column 11. The sleeve 12 is provided with an angle adjustment component 13 and a displacement component 14. The displacement component 14 is connected to the LED lamp 9. The angle adjustment component 13 and the displacement component 14 are used to drive the LED lamp 9 to rotate and extend.

[0031] Specifically, the sleeve 12 can slide along the axis of the connecting post 11 and rotate axially to adjust the horizontal position of the LED light 9 and the circumferential angle along the connecting post 11.

[0032] The LED light 9 is rotated by the angle adjustment component 13 to adjust the illumination angle in the left and right directions, and the LED light 9 is moved by the shifting component 14 to adjust the vertical height.

[0033] The connecting components provide a stable mounting base for the LED light 9, while also enabling flexible multi-dimensional adjustment of the LED light 9's horizontal position, illumination angle (left and right and circumferential), and vertical height, making the control of illumination parameters more flexible.

[0034] For preferred options, please refer to [link / reference]. Figure 2-3 The sleeve 12 is slidably sleeved on the outer wall of the connecting column 11. The outer wall of the connecting column 11 has multiple sets of circumferentially arrayed limiting holes 15. The outer wall of the sleeve 12 is threaded with fastening bolts 16 that are compatible with the limiting holes 15.

[0035] Specifically, after the sleeve 12 slides to the target position, the fastening bolt 16 is rotated so that the end of the fastening bolt 16 is screwed into the corresponding limiting hole 15, thereby fixing the position of the sleeve 12 on the connecting column 11, which locks the position of the LED light 9 at this time and ensures the stability of the illumination position.

[0036] The horizontal position of the LED light 9 can be adjusted by sliding the sleeve 12 on the connecting post 11; in addition, the sleeve 12 can be rotated around the connecting post 11 to adjust the rotation angle of the LED light 9, thereby accurately positioning the illumination area and meeting the needs of fish attraction experiments at different horizontal positions.

[0037] For preferred options, please refer to [link / reference]. Figure 3-5 The angle adjustment component 13 includes: The connecting plate 131 is connected to the sleeve 12. The bottom of the connecting plate 131 is provided with an arc-shaped rod 132 and a connecting rod 133 is hinged thereto. The bottom of the connecting rod 133 is provided with a transition plate 134. The limiting member 135 is provided on the connecting rod 133 and is used to limit the position of the connecting rod 133.

[0038] Specifically, the rotating link 133 can rotate around the hinge point, thereby driving the adapter plate 134 and the LED light 9 to adjust the illumination angle in the left and right directions, realizing flexible adjustment of the illumination angle of the LED light 9, which can simulate natural lighting at different angles and fit the actual lighting environment of the fish passage; after the adjustment is completed, the position of the link 133 is locked by the limiting part 135 to prevent the angle from shifting.

[0039] In this embodiment, preferably, please refer to [reference needed]. Figure 3-5 The limiting component 135 includes: The elastic element 1351 has one end connected to the connecting rod 133 and the other end provided with a pull plate 1352. One end of the pull plate 1352 is provided with a limiting rod 1353, and the other end of the limiting rod 1353 movably passes through the connecting rod 133. The curved rod 132 has multiple insertion holes 136 that are compatible with the connecting rod 133.

[0040] Specifically, when adjusting the angle, pull the pull plate 1352 to drive the limiting rod 1353 out of the insertion hole 136, rotate the connecting rod 133 to the target angle, release the pull plate 1352, and the rebound force of the elastic element 1351 will drive the limiting rod 1353 to insert into the corresponding insertion hole 136, thereby locking the connecting rod 133.

[0041] It can quickly unlock and lock, and the angle adjustment operation is convenient without cumbersome fixing steps; the arc rod 132 has multiple holes 136 designed to achieve multiple fixed positions of the irradiation angle, which can accurately control the light angle and meet the requirements of quantitative test; the overall structure has no complicated electronic control components, the mechanical locking method has high reliability, is resistant to water and humid environments, and is not prone to failure.

[0042] For preferred options, please refer to [link / reference]. Figure 2-5 The shifting component 14 includes: The upper end of the screw 141 is rotatably connected to the bottom of the adapter plate 134, and the lower end is threadedly connected to the displacement cylinder 142. The bottom of the displacement cylinder 142 is provided with a mounting plate 143 that is detachably connected to the LED lamp 9. Mounting plate 143 is provided with a stop bar 144 that slides through the adapter plate 134. The stop bar 144 can guide the movement of the shift cylinder 142, prevent the shift cylinder 142 from rotating synchronously with the screw 141, and ensure the stability of the telescopic adjustment.

[0043] Specifically, by rotating the screw 141, under the limiting and guiding action of the stop bar 144, the shifting cylinder 142 is driven to move up and down by the threaded transmission, and then the LED light 9 is driven to extend and retract through the mounting plate 143. This allows for precise fine adjustment of the vertical height of the LED light 9, which can control the gradient change of the light intensity and meet the needs of fish-attracting experiments at different light heights.

[0044] The LED lamp 9 is detachably connected to the mounting plate 143, making it easy to replace LED lamps 9 of different specifications and expand the range of illumination parameters for experimental research.

[0045] For preferred options, please refer to [link / reference]. Figure 2-5 A knob 17 is provided on the outer wall of the screw 141. This design makes it easy for the operator to hold and rotate the screw 141, reducing the difficulty of adjustment and improving the convenience of the test operation. The knob 17 can be designed as an anti-slip structure to prevent the hand from slipping during operation, which is especially suitable for wet and slippery conditions after the hand comes into contact with water in the test environment.

[0046] In this embodiment, preferably, please refer to [reference needed]. Figure 2-3 Multiple positioning grooves 18 are provided at the corresponding limiting holes 15 on the outer wall of the connecting column 11. The width of the positioning grooves 18 is greater than the inner diameter of the limiting holes 15.

[0047] With this design, when tightening the fastening bolt 16, the end of the fastening bolt 16 first enters the positioning groove 18, slides along the positioning groove 18 to the position of the limiting hole 15, and then is screwed into the limiting hole 15 to complete the fixation.

[0048] The positioning groove 18 provides a guide for the fastening bolt 16, allowing the operator to screw the bolt into the limiting hole 15 without precise alignment, which greatly improves the fixing efficiency of the horizontal position of the sleeve 12. The sleeve 12 can be rotated circumferentially to the required angle first, so that the end of the fastening bolt 16 enters the positioning groove 18 first, and then the sleeve 12 is moved horizontally along the connecting column 11. The horizontal position of the sleeve 12 can then be adjusted. This can prevent the angle of the sleeve 12 from changing during horizontal adjustment and improve the adjustment effect.

[0049] In this embodiment, preferably, please refer to [reference needed]. Figure 2-3 The connecting column 11 has fixing holes 19 at both ends, and the support plate 10 has fixing bolts that are threaded to the fixing holes 19.

[0050] This design allows the two ends of the connecting column 11 to be attached to the support plate 10, aligning the fixing hole 19 with the bolt hole on the support plate 10. By screwing in the fixing bolt, the connecting column 11 and the support plate 10 can be detachably fixed, facilitating the disassembly and replacement of the connecting column 11. If a component is damaged, it can be repaired accordingly, reducing maintenance costs. There is no need for destructive modifications such as welding to the test water tank 2; installation can be completed by bolt connection. It is compatible with test water tanks of different specifications, improving the versatility of the device.

[0051] In this embodiment, preferably, please refer to [reference needed]. Figure 1 The water circulation system includes a variable frequency water pump 20, whose input and output ends are connected to the water storage tank 1 and the test water tank 2 respectively through water pipes.

[0052] This design allows the variable frequency water pump 20 to pump water from the storage tank 1 into the test tank 2, and then the water in the test tank 2 flows back to the storage tank 1, forming a circulating water flow. By adjusting the frequency of the variable frequency water pump 20, the outflow rate and water flow speed can be changed to match the hydrodynamic environment of different fish migrations, thus improving the realism of the experiment. The water circulation design enables the reuse of water resources, avoids continuous water addition during the experiment, saves experimental water, and reduces experimental costs. As a water storage unit, the storage tank 1 can stabilize the water level in the test tank 2, avoid water level fluctuations caused by changes in water flow speed, and ensure the stability of the experimental environment.

[0053] The water circulation system also includes a flow controller and a flow rectifier, which can simulate a flow velocity of 0.1-2.0 m / s. The variable frequency pump provides a stable power source, and the flow controller precisely adjusts the water flow rate, simulating the natural water flow velocity range of 0.1-2.0 m / s to meet the hydrodynamic needs of different fish migrations. The flow rectifier is used to optimize the flow field distribution, avoid eddies in the tank, and ensure that the water flow is uniform and stable, which is highly consistent with the actual fishway water flow environment.

[0054] Furthermore, the interior of the experimental tank 2 is equipped with a simulated fishway partition structure, the bottom is laid with ecological simulated substrate, the side walls are equipped with fish shelter structures, and the two ends of the tank are equipped with anti-escape interception nets. The size of the tank can be adjusted according to the experimental needs to ensure that the experimental space meets the migration behavior needs of fish of different sizes, while facilitating observation and data collection.

[0055] The illumination mechanism 8 also includes a spectrum control module and a light intensity adjustment module. The LED lights 9 can be arranged in a matrix, with each LED independently controlled, enabling three illumination modes: point light source, line light source, and surface light source, covering the 380-780nm visible light and near-infrared spectrum range. The light intensity adjustment range is 0-5000 lux, and the flicker frequency is adjustable from 0-50Hz. Both the spectrum control module and the light intensity adjustment module communicate with the central control unit to receive precise control commands.

[0056] Furthermore, this experimental setup also includes a fish behavior monitoring system, consisting of an underwater high-definition camera, an infrared sensor array, a three-dimensional trajectory tracking module, and a behavior analysis server. The underwater high-definition camera and the infrared sensor array work together to achieve full-area monitoring of the tank without blind spots, unaffected by water transparency. The three-dimensional trajectory tracking module uses underwater binocular vision positioning technology to acquire real-time three-dimensional coordinate data of individual experimental fish, with a positioning accuracy of ±2mm and a sampling frequency of ≥30fps. The behavior analysis server has built-in intelligent algorithms to automatically process the collected data and output quantitative indicators such as fish swimming trajectory, aggregation density, and reaction time.

[0057] Furthermore, the central control unit integrates a light parameter programmable controller, a water flow parameter controller, and a data acquisition processor to enable collaborative operation of all systems. It incorporates a built-in light-water flow-behavior coupling algorithm, which can automatically execute preset experimental plans, synchronously adjust the parameters of the light-attracting fish system and the water flow circulation system, and collect fish behavior data and environmental data in real time. The accompanying host computer software can automatically generate fish phototaxis response curves and experimental analysis reports.

[0058] It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various modifications or changes based on them. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

[0059] It should be noted that if the embodiments of the present invention involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0060] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

Claims

1. A fishway light-induced fish-attracting experimental device, comprising a water storage tank (1) and a water circulation system, characterized in that, Also includes: The test water tank (2) is set above the water storage tank (1). The test water tank (2) is divided into an upstream section (3), a midstream section (4) and a downstream section (5), and an adaptation zone (6) is provided in the downstream section (5). A support frame (7) is erected above the midstream section (4), and a black cloth is laid on the support frame (7); The lighting mechanism (8) is located on the upper wall of the middle section (4). The lighting mechanism (8) includes an LED lamp (9) and a connecting component. The connecting component is used to adjust the position and angle of the LED lamp (9).

2. The fishway light-induced fish-attracting experimental device according to claim 1, characterized in that, The connecting component includes: Two support plates (10) are connected to the inner wall of the test water tank (2), and a connecting column (11) is installed between the two support plates (10). A sleeve (12) is installed on the outside of the connecting column (11). The sleeve (12) is provided with an angle adjustment component (13) and a displacement component (14). The displacement component (14) is connected to the LED lamp (9). The angle adjustment component (13) and the displacement component (14) are respectively used to drive the LED lamp (9) to rotate and extend.

3. The fishway light-induced fish-attracting experimental device according to claim 2, characterized in that, The sleeve (12) is slidably sleeved on the outer wall of the connecting column (11). The outer wall of the connecting column (11) has multiple sets of circumferentially arrayed limiting holes (15). The outer wall of the sleeve (12) is threaded with fastening bolts (16) that are compatible with the limiting holes (15).

4. The fishway light-induced fish-attracting experimental device according to claim 2, characterized in that, The angle adjustment component (13) includes: A connecting plate (131) is connected to the sleeve (12). The bottom of the connecting plate (131) is provided with an arc-shaped rod (132) and a connecting rod (133) is hinged thereto. The bottom of the connecting rod (133) is provided with a transition plate (134). A limiting member (135) is provided on the connecting rod (133) for limiting the position of the connecting rod (133).

5. The fishway light-induced fish-attracting experimental device according to claim 4, characterized in that, The limiting element (135) includes: An elastic element (1351) has one end connected to the connecting rod (133) and the other end provided with a pull plate (1352). One end of the pull plate (1352) is provided with a limiting rod (1353), and the other end of the limiting rod (1353) movably passes through the connecting rod (133). The arc-shaped rod (132) has multiple insertion holes (136) that are compatible with the connecting rod (133).

6. The fishway light-induced fish-attracting experimental device according to claim 4, characterized in that, The shifting component (14) includes: The upper end of the screw (141) is rotatably connected to the bottom of the adapter plate (134), and the lower end is threadedly connected to the displacement cylinder (142). The bottom of the displacement cylinder (142) is provided with a mounting plate (143) that is detachably connected to the LED lamp (9). The mounting plate (143) is provided with a stop bar (144) that slides through the adapter plate (134).

7. The fishway light-induced fish-attracting experimental device according to claim 6, characterized in that, A knob (17) is provided on the outer wall of the screw (141).

8. The fishway light-induced fish-attracting experimental device according to claim 3, characterized in that, The outer wall of the connecting column (11) is provided with a plurality of positioning grooves (18) corresponding to the limiting hole (15), and the width of the positioning grooves (18) is greater than the inner diameter of the limiting hole (15).

9. The fishway light-induced fish-attracting experimental device according to claim 2, characterized in that, The connecting column (11) has fixing holes (19) at both ends, and the support plate (10) has fixing bolts that are threaded to the fixing holes (19).

10. The fishway light-induced fish-attracting experimental device according to claim 1, characterized in that, The water circulation system includes a variable frequency water pump (20), the input end and output end of which are connected to the water storage tank (1) and the test water tank (2) respectively through water pipes.

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