Device for fish taxis experiment

Abstract

The invention discloses a device for carrying out a fish driving experiment, and belongs to fish behavior research in fishway engineering. The device comprises a water tank experiment part, a water tank control part and a camera shooting and recording device. The water tank experiment part comprises branch water tanks and an annular central pool, and the branch water tanks are axially symmetrically arranged around the annular central pool; the water tank control part comprises a water inlet pipe, a water stabilizing weir, a tail gate, a sewer pipe, a water return tank, an upper reservoir, a water return pump, an upper water pipe, an overflow tank and a water supply pipe; the camera shooting and recording device comprises a top camera and an orthogonal calibration grid; the device has the advantages that one-way physiological stimulation can be separated to stimulate fishes, and behavior responses of the fishes under various stimulation conditions are analyzed; various kinds of stimulation are uniformly or separately provided for the fish, and then the taxis preference of the fish is analyzed.

Description

Technical Field

[0001] The invention discloses a device for conducting fish drive experiment, specifically a device for analyzing the reaction of fish to different physiological stimuli by placing fish in different tropism characteristic environments, and belongs to the field of fish behavior research in fishway engineering. Background Art

[0002] Fish tropism refers to the directional behavior of an animal in response to a unidirectional environmental stimulus. Examples include fish's movement toward light (positive phototaxis) or away from light (negative phototaxis), their tendency to flow, their ability to maintain a fixed target, and their tendency to avoid odors or highly oxygenated water. Tropism is a stereotyped response and the simplest form of instinctive behavior. While fish foraging behavior is also a directional behavior, this complex foraging behavior is heavily learned and therefore not considered a tropism.

[0003] CN114223583A discloses an interactive test method and detection system for simultaneously testing the phototaxis and rheotaxis of fish. The method includes the following steps: directing water flow into two test channels and then into a confluence area; guiding fish implanted with PIT markers in the confluence area to swim toward the test channels; placing different light sources above the test channels; and placing inductive antenna coils at both ends of the channels. Fish are placed in the confluence area. In a dark environment, the light sources are turned on to generate water flow. The PIT signals generated by the same PIT marker are recorded over time, and the percentage of time the fish spend in each test channel is recorded. The light sources are then swapped and the above steps repeated. Data on the phototaxis and rheotaxis of different fish can be analyzed.

[0004] CN205848361U An experimental device for studying the phototaxis of fish. This utility model discloses an experimental device for studying the phototaxis of fish. It includes a water tank, which is divided into two channels by a baffle. A plurality of underwater illuminometers are arranged at equal intervals at the bottom of one channel. The other channel is a fish passage. A light source device is provided on the left end face of the water tank. All inner walls of the water tank not close to the light source device are covered with black cloth. Marking tapes are provided at equal intervals at the bottom of the water tank. A plurality of support frames are provided on the side of the water tank along the direction of fish passage. An infrared camera is fixedly installed at the end of the horizontal arm of the support frame. The infrared camera is arranged directly above the water tank. The device can study the phototaxis of fish. According to the preferences of different fish for different light colors and the most suitable illumination range, it can provide valuable reference for light-induced fish driving to achieve safe fish crossing dam technology.

[0005] CN206895569U Fish phototaxis measurement device, which discloses a fish phototaxis measurement device, including an experimental water tank (1), characterized in that: one end of the experimental water tank (1) is movably inserted with a baffle (2), and the baffle (2) divides the experimental water tank (1) into a temporary storage chamber (3) and a measurement chamber (4). Multiple parallel dividing lines (5) are drawn at the bottom of the measurement chamber (4). One end of the measurement chamber (4) is provided with an organic glass plate (6), which is connected to a cylindrical light-shielding cover (7). The other end of the light-shielding cover (7) is connected to a lamp cover (8), and a light source (9) is arranged inside the lamp cover (8). The light source (9) is connected to a power supply through a dimming switch (10). A camera (11) is arranged above the experimental water tank (1). Except for the organic glass plate (6), other parts of the experimental water tank (1) are black, and the baffle (2) is also black.

[0006] CN210157860U discloses a fish phototaxis test fish tank. The utility model relates to the technical field of fish tanks, including a feeding tank, a transition tank and a living tank connected in sequence. The feeding tank and the living tank are water tanks, and the transition tank is a waterless tank; the feeding tank and the living tank are connected through a transition pipe in the transition tank. The front and rear sides of the transition tank and its connection with the living tank are light-tight tank walls; a feed box is arranged inside the feeding tank. The feed box is located at the opening of the transition pipe in the feeding tank and is fixed to the top of the feeding tank through a bracket at the upper end. The bait box has holes matching the bait. This device has two independent spaces for observing organisms. There is a channel between the two spaces, and the light on-off in each space will not affect the illuminance intensity of the other space, thus realizing the indoor observation of fish phototaxis, enabling scientific researchers and science popularization educators to conduct fish phototaxis teaching research safely, without being restricted by time, region and natural environment.

[0007] The above-mentioned prior arts are the closest prior arts to this application. Generally speaking, the above prior arts all have two common defects:

[0008] 1. Through the above devices, it is impossible to accurately obtain the relationship between the behavior of fish and different unidirectional physiological stimuli. Especially when multiple physiological stimuli act together, it is impossible to determine which stimulus has the greatest influence weight on fish.

[0009] 2. Unifying or separating multiple stimuli and providing them to fish, and then analyzing the taxis preference of fish has always been a problem that researchers in this field have tried to solve. Summary of the Invention

[0010] The technical problem to be solved by the present invention is: to propose a device that can separately provide different taxis effects to fish and an experimental device for discriminating fish taxis.

[0011] The above experimental device for discriminating fish tropism includes: a water tank experimental part, a water tank control part, and a camera recording device;

[0012] The above water tank experimental part includes: branch water tanks, an annular central pool, and the branch water tanks are arranged axially symmetrically around the annular central pool;

[0013] The above water tank control part includes: a water inlet pipe, a water stabilizing weir, a tail gate, a drain pipe, a return water tank, an upper water reservoir, a return water pump, an upper water pipe, an overflow tank, and a water supply pipe;

[0014] There are four above-mentioned branch water tanks, arranged in a "cross" shape, spaced 90° from each other, and the four branch water tanks point to the east, south, west, and north respectively; the head end of each branch water tank is connected to a water inlet pipe and a water stabilizing weir, and the downstream is connected to a tail gate, and the end of the tail gate is connected to the annular central pool;

[0015] After the end of the above-mentioned branch water tank, that is, after the branch water tank enters the annular central pool, the lengths of the two side walls of the water tank are unequal. One side wall is directly connected to the annular pool, and the other side wall extends into the annular pool and approaches the central guide gate near the annular central pool. The distance between the two is equal to three times the body width of the fish passing object. The above-mentioned central guide gate is a whole cylindrical surface, and the cylindrical surface is composed of multiple rotatable blades with adjustable angles.

[0016] The bottom of the annular central pool is connected to a drain pipe, the drain pipe is connected to a return water tank, the end of the return water tank is connected to a return water pump, the return water pump is connected to an upper water pipe, the upper water pipe is connected to an upper water reservoir, an overflow tank is installed in the upper water reservoir, the upper water reservoir is connected to a water supply pipe, the overflow part of the overflow tank is connected to a return water pipe, the return water pipe is connected to the return water tank, and the water supply pipe is connected to the water inlet pipe;

[0017] A valve is provided on the water inlet pipe to control the flow rate.

[0018] The above camera recording device includes: a top camera and an orthogonal calibration grid;

[0019] Before the experiment, the orthogonal calibration grid is placed in the water tank experimental part, and the top camera is used to take pictures to calibrate the water tank plane position corresponding to the camera image;

[0020] When the experiment is carried out, the return water tank is filled with water, the return water pump is turned on, the water in the return water tank is pumped into the upper water reservoir. When the water level is too high, the water overflows through the overflow tank, and the overflowed water enters the return water pipe and returns to the return water tank; the non-overflowed water enters the water inlet pipe through the water supply pipe, enters the water stabilizing weir through the valve, then flows through the branch water tank, the tail gate, enters the annular central pool, flows into the drain pipe, and then enters the return water tank to complete the whole process;

[0021] When the water body needs aeration, an aeration device is installed in the upper water reservoir;

[0022] When the water body needs to adjust the temperature, a temperature control device is installed in the upper water reservoir;

[0023] Place the experimental subject in the water tank experiment section, adjust the external environment to generate stimuli, and record the movement process of the experimental subject with the top camera.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. The present invention provides a water tank device capable of conducting fish tropism experiments, which can separately stimulate fish with unidirectional physiological stimuli and analyze the behavioral responses of fish under various stimulation conditions;

[0026] 2. Provide various stimuli to fish either unified or separately, and then analyze the tropism preference of fish;

[0027] 3. The design method of multiple branch water tanks of the device of the present invention around the annular central pool. By changing the drainage angle of the branch water tanks and the opening angle of the central guide door, the relationship between the Coriolis force and the centrifugal force of the bend can be adjusted. Furthermore, the external force conditions received by fish in different bend environments can be fully simulated, so that the potential fluid external force stimuli can be eliminated or enhanced when the device conducts environmental stimulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Overall schematic diagram of an experimental device for discriminating fish tropism of the present invention;

[0029] Figure 2 Schematic diagram of the modification of the branch water tank of an experimental device for discriminating fish tropism of the present invention into a phototaxis experimental device;

[0030] Figure 3 Overall schematic diagram of the phototaxis experimental device of the present invention after being blocked by a light-shielding cloth;

[0031] Figure 4 The present invention Figure 1 Top view schematic diagram of an experimental device for discriminating fish tropism;

[0032] Figure 5 The present invention Figure 4 Partial enlarged schematic diagram of the annular central pool of an experimental device for discriminating fish tropism of the present invention;

[0033] Figure 6 Three-dimensional schematic diagram of an experimental device for discriminating fish tropism of the present invention;

[0034] Figure 7 Longitudinal sectional schematic diagram of the underwater light arrangement of the phototaxis experimental water tank;

[0035] Figure 8 Partial schematic diagram of the central guide door of the annular central pool of the present invention.

[0036] Branch water tank 1, annular central pool 2, central guide gate 3, water inlet pipe 4, water stabilizing weir 5, tail gate 6, drain pipe 7, return water tank 8, upper reservoir 9, upper water pump 10, upper water pipe 11, overflow tank 12, water supply pipe 13, return water pipe 14, rotating blade 15, fish screen 16. Detailed implementation mode

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] Embodiment 1

[0039] Water flow tropism experiment: A certain reservoir project mainly consists of water retaining structures, water discharging structures, etc. The dam height is 70m, and a fish passage facility is planned to be built. In order to maintain the ecological characteristics to the greatest extent and provide a continuous and unbroken connection corridor for upstream migratory fish, the fish passage objects are Schizothorax longibarbus and Schizothorax labrosus, which are collectively referred to as schizothorax fish in this embodiment.

[0040] An experimental device for discriminating fish tropism includes: a water tank experiment part, a water tank control part, and a camera recording device;

[0041] The above-mentioned water tank experiment part includes: branch water tank 1, annular central pool 2, central guide gate 3, rotating blade 15, fish screen 16, and the branch water tank 1 is arranged axially symmetrically around the annular central pool 2;

[0042] The above-mentioned water tank control part includes: water inlet pipe 4, water stabilizing weir 5, tail gate 6, drain pipe 7, return water tank 8, upper reservoir 9, return water pump 10, upper water pipe 11, overflow tank 12, water supply pipe 13;

[0043] There are four of the above-mentioned branch water tanks 1, arranged in a "cross" shape, spaced 90° from each other, and the four branch water tanks 1 respectively point to the east, south, west, and north; the head end of each branch water tank 1 is connected with a water inlet pipe 4 and a water stabilizing weir 5, and the downstream is connected with a tail gate 6, and the tail end of the tail gate is connected to the annular central pool 2;

[0044] The bottom of the annular central pool is connected with a drain pipe 7, the drain pipe 7 is connected with a return water tank, the end of the return water tank 8 is connected with a return water pump 10, the return water pump 10 is connected with an upper water pipe 11, the upper water pipe 11 is connected with an upper reservoir 9, an overflow tank is installed in the upper reservoir 9, the upper reservoir 9 is connected with a water supply pipe 13, the overflow part of the overflow tank 12 is connected with a return water pipe 14, the return water pipe 14 is connected with the return water tank 8, and the water supply pipe 13 is connected with the water inlet pipe 4;

[0045] A valve is provided on the water inlet pipe 4 to control the flow rate.

[0046] The above-mentioned camera recording device includes: a top camera C1, an orthogonal calibration grid; the orthogonal calibration grid is a white bottom plate with a black square grid drawn on it, and the side length of each grid is 2-5 cm;

[0047] Before the experiment, place the orthogonal calibration grid in the experimental part of the water tank. Use the top camera C1 to take pictures to calibrate the position of the water tank plane corresponding to the camera image.

[0048] When conducting the experiment, fill the return water tank 8 with water, turn on the return water pump 10, and the water in the return water tank 8 is pumped into the upper reservoir 9. When the water level is too high, the water overflows through the overflow tank 12, and the overflowed water enters the return water pipe 14 and returns to the return water tank 8; the non-overflowed water enters the water supply pipe 13, then enters the water inlet pipe 4, passes through the valve and enters the water stabilizer weir 5, then flows through the branch water tank 1, the tail gate 5, enters the annular central pool 2, flows into the drain pipe 7 through the central guide gate 3, and then enters the return water tank 8 to complete the entire process.

[0049] When the water body needs to be aerated, install an aeration device in the upper reservoir.

[0050] When the water temperature needs to be adjusted, install a temperature control device in the upper reservoir.

[0051] Place the experimental object in the experimental part of the water tank, adjust the external environment to generate stimuli, and use the top camera C1 to record the movement process of the experimental object.

[0052] At the start of the experiment, place the experimental object fish between the central guide gate 3 and the tail gate 6. Release different flow rates in the 4 branch water tanks 1, and adjust the angle of the rotor 15 and the angle of the tail gate 6 so that a clockwise vortex is formed at the drain pipe 7. At this time, when the fish swim upstream against the current, they swim to the left, but will be affected by the Coriolis force that deflects to the right, and the experimental object will consume more energy. And it tends to leave the circulation area as soon as possible and enter one of the 4 branch water tanks 1. Among them: the east direction provides a flow rate of 1.0 m / s, the north direction provides a flow rate of 0.8 m / s, the west direction provides a flow rate of 0.6 m / s, and the south direction provides a flow rate of 0.4 m / s. Judge which flow rate the fish prefer by the number of fish entering different branch water tanks.

[0053] In this experiment, the following record table is obtained. Therefore, it can be known that 0.6 m / s is the tropotactic flow rate of Schizothorax grahami.

[0054] Table 1 Distribution table of experimental objects

[0055] Water tank position Eastward branch water tank Northward branch water tank Westward branch water tank Southward branch water tank Water flow velocity in the water tank 1.0 m / s 0.8 m / s 0.6 m / s 0.4 m / s Number of experimental subjects 2 tails 5 tails 12 tails 6 tails

[0056] Example 2

[0057] Phototaxis experiment: Select one branch water tank 1 of the device of the present invention.

[0058] The full-spectrum light source L2 is arranged in a branch water tank in the following way: on both side walls, it is divided into a first section, a middle section, and a last section along the length direction, and a segmented grille G1 is set in the middle of the interval between the two sections; in the elevation direction, it is divided into three elevations, the highest height is close to the lower surface of the water surface in the water tank, the lowest height is 3 times the height of the fish body, and the middle height is in the middle of the highest height and the lowest height; each light source can be independently adjusted in angle through a pan-tilt head.

[0059] In this embodiment, the water surface in the above-mentioned water tank is 1m, 3 times the height of the fish body is 36cm, and the above-mentioned middle height is 68cm.

[0060] The top of the experimental water tank is covered with a completely light-tight cloth NL1, and a top camera C1 is set to capture the behavior trajectory of the schizothoracin; a dual-camera group C2 is set according to the fish-eye focal length to capture the light source change.

[0061] Use a water pump to fill the experimental water tank with water, keep the water tank full, stop the water pump, close all the segmented grilles G1, turn on all the lights, keep them at the lowest brightness, and make all of them shine on the bottom of the first section. When at its lowest brightness, the illuminance at the bottom of the first section of the experimental water tank is 2×10 -5 Lux; Place the experimental schizothoracin in a fish holding box, place the fish holding box at the bottom of the first section of the experimental water tank, open the hatch of the fish holding box, turn on the fish attracting water pump, attract the fish into the first section of the experimental water tank, close and remove the fish attracting water pump and remove the fish holding box to let the fish fully adapt in the first section of the experimental water tank; the fish attracting water pump is an electric water-pushing propeller.

[0062] Determine through the top camera C1 that the experimental fish has started to enter a relaxed state, open the segmented grille between the first section and the middle section, and open the segmented grille between the middle section and the last section.

[0063] Adjust the light brightness in the following order to obtain the relationship between the fish movement path and reaction time and the light brightness. The entire fish behavior path is recorded by the top camera C1:

[0064] (1) When the experimental object starts to swim randomly within the first section, brighten the light brightness on the right side of the middle of the middle section until the experimental fish starts to swim towards the light, stop increasing the brightness, and wait for the experimental object to approach the light on the right side of the middle of the middle section.

[0065] (2) When the experimental object starts to swim randomly at the light on the right side of the middle of the middle section, brighten the light brightness on the left side of the middle of the last section until the experimental fish starts to swim towards the light, and wait for the experimental object to approach the light on the left side of the middle of the last section.

[0066] (3) When the experimental object starts to swim randomly at the light on the left side of the middle of the last section, brighten the light brightness on the right side of the middle of the last section until the experimental fish starts to swim towards the light, and wait for the experimental object to approach the light on the right side of the middle of the last section.

[0067] (4) When the experimental subject starts to swim randomly at the light on the right side of the middle of the last section, brighten the light on the left side of the middle of the middle section until the experimental fish starts to swim towards the light, and wait for the experimental subject to approach the light on the left side of the middle of the middle section;

[0068] (5) When the experimental subject starts to swim randomly at the light on the left side of the middle of the middle section, brighten the light on the right side of the middle of the first section until the experimental fish starts to swim towards the light, and wait for the experimental subject to approach the light on the right side of the middle of the first section;

[0069] (6) When the experimental subject starts to swim randomly at the light on the right side of the middle of the first section, brighten the light on the left side of the middle of the first section until the experimental fish starts to swim towards the light, and wait for the experimental subject to approach the light on the left side of the middle of the first section; Repeat the above steps until the experimental subject no longer moves due to the change in light brightness or the light brightness reaches the maximum;

[0070] Filter the full-spectrum light source with a [200, 400] nm band-pass optical filter, and repeat steps (1)-(6);

[0071] Filter the full-spectrum light source with a [390, 770] nm band-pass optical filter, and repeat steps (1)-(6);

[0072] Filter the full-spectrum light source with a [770, 1500] nm band-pass optical filter, and repeat steps (1)-(6);

[0073] Record the path of the above experimental subject under the swimming time series through the top camera.

[0074] The above-mentioned phototaxis experimental water tank is based on the taxis test device and adds: a light adjustment system;

[0075] The above-mentioned light adjustment system includes: a lighting adjustment system and a natural light adjustment system; The above-mentioned lighting adjustment system includes: an above-water lighting adjustment system and an underwater lighting adjustment system;

[0076] The above-mentioned above-water light adjustment system includes: a light-shield NL1, a light-shield support NL2, a filter plate NL3, a lamp holder L11, a lamp holder guide rail L12, a lamp L1, an underwater filter plate L13, and an underwater filter plate card slot L14;

[0077] The above-mentioned light-shield NL1 wraps the entire experimental part of the water tank, with all sides closed and an opening provided at the top for installing different filter plates;

[0078] The above-mentioned lamp L1 is installed on the lamp holder L11, and the lamp holder L11 is installed on the lamp holder guide rail L12. The above-mentioned lamp holder guide rail L12 is laid along both sides of the branch water tank 1;

[0079] Preferably, the above-mentioned lamp L1 moves up and down along the lamp holder L11;

[0080] Preferably, there are multiple above-mentioned lamps L1, and their wavelength ranges cover [200, 1500] nm;

[0081] Preferably, the above-mentioned lamp L1 is a directional spotlight with adjustable angle;

[0082] The above-mentioned underwater light adjustment system includes: an underwater lamp L2 and an underwater lamp holder;

[0083] The above-mentioned underwater lamp L2 is a directional spotlight with adjustable angle. The above-mentioned underwater lamp holder is fixed on the side wall of the water tank experiment part, and the above-mentioned underwater lamp L2 is installed on the underwater lamp holder;

[0084] The above-mentioned underwater lamps L2 are respectively arranged in the upper, middle and lower parts. The lower lamp is 3 times the height of the fish body away from the bottom of the water tank. The upper L2 is arranged below the water surface, and the middle L2 is arranged in the middle between the bottom and the upper part.

[0085] Table 2 Analysis table of light intensity range and wavelength range when fish are attracted

[0086] Time Behavior Left eye light intensity (Lux) Right eye light intensity (Lux) Wavelength range (nm) 00:02.5 Moving towards the light source 0.5 1 390-770 00:05.3 Moving towards the light source 0.9 12 390-770 00:06.2 Moving towards the light source 10 17 390-770 00:08.5 Moving towards the light source 16 2 390-770 00:10.6 Moving towards the light source 18 2 390-770 00:13.4 Moving towards the light source 19 6 390-770 00:23.1 Moving towards the light source 69 23 390-770 00:25.6 Moving towards the light source 36 65 390-770 00:31.6 Moving towards the light source 75 23 390-770 00:32.5 Moving towards the light source 42 96 390-770 00:35.3 Moving towards the light source 65 35 390-770 00:37.2 Moving towards the light source 78 42 390-770 00:39.2 Moving towards the light source 96 53 390-770 00:41.6 Moving towards the light source 53 62 390-770 00:42.6 Moving towards the light source 68 68 390-770 00:45.7 Moving towards the light source 94 72 390-770 00:46.8 Moving towards the light source 69 81 390-770 00:51.2 Moving towards the light source 110 93 390-770 00:53.4 Moving towards the light source 115 135 390-770 00:54.5 Moving towards the light source 126 165 390-770 00:55.6 Moving towards the light source 131 217 390-770

[0087] Example 3

[0088] Analysis of the respective stimulus taxis of multi-environment characteristic parameters: The 4 branch water tanks 1 of this experimental device are respectively set as follows: The flow rates of the three water branch tanks 1 in the north, west and south are all set to 0.1 m / s, that is, lower than the induction flow rate of the experimental fish, but the preferred environmental stimuli can be transported to the initial stay area of the fish, that is, the annular central pool 2;

[0089] The flow rate of the eastward branch water tank 1 is set to the preferred flow rate of Schizothorax longibarbus, which is 0.6 m / s;

[0090] The northward branch water tank 1 is a light taxis water tank, and the light intensity is set to 100 Lux, with a wavelength bandpass of 390 - 770 nm;

[0091] The westward branch water tank 1 is a olfactory taxis stimulus, and the bait odor substance is dissolved in the southward branch water tank;

[0092] The southward branch water tank is a dissolved oxygen and acoustics branch water tank. Aeration in the branch water tank reaches 100%, and the sound of jet water inflow is set, and a large number of bubbles descend along with the water body.

[0093] After the physical and chemical conditions in each of the above branch water tanks are stable, the experimental individuals are placed in the annular central pool 2, that is, the position between the central guide door 3 and the fish barrier net 16, and start to record the behavioral characteristics of the experimental objects over time. Finally, the following table is obtained:

[0094] Table 3 Distribution table of experimental subjects for different unidirectional stimuli

[0095] Water tank position Eastward branch water tank Northward branch water tank Westward branch water tank Southward branch water tank Stimulation method Water flow stimulation Light stimulation Olfaction Dissolved oxygen and acoustics Number of experimental subjects 5 tails 1 tail 4 tails 4 tails

Claims

1. An apparatus for conducting fish repellency experiments, characterized in that: It includes the following components: The flume experiment part, the flume control part, and the camera recording device; the flume experiment part includes: branch flumes, an annular central pool, and the branch flumes are arranged axially symmetrically around the annular central pool; The flume control part includes: an inlet pipe, a water stabilizer weir, a tail gate, a drain pipe, a return flume, an upper reservoir, a return water pump, an upper water pipe, an overflow flume, and a water supply pipe; There are four branch flumes, arranged in a "plus" shape, spaced 90° from each other, and the four branch flumes point to the east, south, west, and north respectively; the head end of each branch flume is connected to an inlet pipe and a water stabilizer weir, and the downstream is connected to a tail gate, and the end of the tail gate is connected to the annular central pool; After the end of the branch flume, that is, after the branch flume enters the annular central pool, the lengths of the two side walls of the flume are unequal. One side wall is directly connected to the annular pool, and the other side wall extends into the annular pool and approaches the central guide gate near the annular central pool. The distance between the two is equal to three times the body width of the fish passing object. The central guide gate is a cylindrical surface as a whole, and the cylindrical surface is composed of multiple rotatable blades with adjustable angles.

2. The device for conducting fish repellency experiments according to claim 1, characterized in that: The bottom of the annular central pool is connected to a drain pipe, the drain pipe is connected to a return flume, the end of the return flume is connected to a return water pump, the return water pump is connected to an upper water pipe, the upper water pipe is connected to an upper reservoir, an overflow flume is installed in the upper reservoir, the upper reservoir is connected to a water supply pipe, the overflow part of the overflow flume is connected to a return water pipe, the return water pipe is connected to the return flume, and the water supply pipe is connected to the inlet pipe; A valve is set on the inlet pipe to control the flow rate.

3. An apparatus for conducting fish repellency experiments according to claim 1, wherein: The camera recording device includes: a top camera, and an orthogonal calibration grid; Before the experiment, the orthogonal calibration grid is placed in the flume experiment part, and the top camera is used to take pictures to calibrate the position of the camera image corresponding to the flume plane.

4. An apparatus for conducting fish repellency experiments according to claim 1, wherein: When the experiment is carried out, the return flume is filled with water, the return water pump is turned on, and the water in the return flume is pumped into the upper reservoir. When the water level is too high, the water overflows through the overflow flume, and the overflowed water enters the return water pipe and returns to the return flume; the non-overflowed water enters the inlet pipe through the water supply pipe, enters the water stabilizer weir through the valve, then flows through the branch flumes, the tail gate, enters the annular central pool, flows into the drain pipe, and then enters the return flume to complete the entire process; When the water body needs to be aerated, an aeration device is installed in the upper reservoir; When the water temperature needs to be adjusted, a temperature control device is installed in the upper reservoir; The experimental object is placed in the flume experiment part, the external environment is adjusted to generate stimuli, and the movement process of the experimental object is recorded by the top camera.

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