An auxiliary device for fish swimming ability determination and trait analysis

Abstract

The application provides a kind of fish swimming ability determination and character analysis auxiliary equipment, it is related to fish experimental equipment technical field, including water tank, water tank is divided into water circulation area, arc water tank area, rectification observation area and backflow area, water circulation area, rectification observation area are isolated from each other setting, the water inlet end of arc water tank area, water outlet end are connected with water circulation area, rectification observation area setting, the water inlet end of backflow area, water outlet end are connected with rectification observation area, water circulation area setting, fish body shooting device is installed in the rectification observation area of water tank;The device further includes movable flow rate determination mechanism, instantaneous water flow rate determination part is arranged in rectification observation area, instantaneous water flow rate determination part does displacement movement along the length, width and height of water tank three directions.The application can realize the body shape analysis of target fish on the basis of realizing fish swimming ability determination.

Description

Technical Field

[0001] This invention relates to the field of fish experimental equipment technology, specifically to an auxiliary device for measuring the swimming ability and analyzing the traits of fish. Background Technology

[0002] With the rapid development of my country's social economy, the total demand for aquatic products has increased dramatically. Optimizing aquaculture techniques and improving aquaculture processes are key to developing modern aquaculture technology and are of paramount importance for achieving healthy fish farming and optimizing aquaculture models.

[0003] In traditional aquaculture, the design of aquaculture systems is primarily based on the growth and behavioral characteristics of fish. Swimming behavior, as a typical manifestation of fish activity, is an important reference for designing aquaculture systems. Traditional fish swimming ability testing devices mainly use a water tank with a circular lane design to provide a stable flow environment with constant flow. For example, utility model CN212464554U discloses a fish swimming ability testing device, including a sealed circular water tank, a first testing area, a second testing area, and a flow velocity measuring device. This testing device measures one or more of the following: induced flow velocity, critical swimming velocity, and sudden swimming velocity. The three velocities are derived by inversely calculating the water flow velocity based on the relationship between motor frequency and water flow velocity.

[0004] It is known that the traditional method of measuring swimming ability in a water tank mainly relies on the power and speed of the motor (propeller) to estimate the water flow velocity in the test area, and cannot measure the real-time flow velocity within the test area. In addition, the traditional method of measuring the size of the target fish in a water tank mainly relies on manual measurement before the experiment. The related operations during the process will cause certain stress to the fish, thus affecting the subsequent measurement of swimming behavior and ability.

[0005] Therefore, there are areas for improvement. The present invention provides an auxiliary device for measuring the swimming ability and analyzing the traits of fish. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide an auxiliary device for measuring and analyzing the swimming ability and traits of fish. The specific solution is as follows:

[0007] An auxiliary device for measuring and analyzing the swimming ability and traits of fish includes a water chamber divided into a water circulation zone, an arc-shaped water tank zone, a rectification and observation zone, and a recirculation zone. The water circulation zone and the rectification and observation zone are isolated from each other. The inlet and outlet of the arc-shaped water tank zone are connected to the water circulation zone and the rectification and observation zone, respectively. The inlet and outlet of the recirculation zone are connected to the rectification and observation zone and the water circulation zone, respectively.

[0008] The water tank, located in the rectification observation area, is equipped with a fish photography device.

[0009] The device also includes a mobile flow velocity measuring mechanism, which is located in the rectification observation area and has an instantaneous water flow velocity measuring unit. The instantaneous water flow velocity measuring unit moves along the length, width and height of the water tank.

[0010] Therefore, after a certain amount of water is poured into the water tank, the water circulation zone provides the power to agitate the water, giving it a certain flow velocity. The water flows to the vicinity of the arc-shaped water tank area and enters the arc-shaped water tank area from the inlet end with a higher flow velocity. The arc-shaped water tank area stabilizes the agitated water flow. The stabilized water flows from the outlet end of the arc-shaped water tank area into the rectification observation area, providing a stable measurement environment for the fish in the rectification observation area. The water in the rectification observation area then re-enters the water circulation zone through the return flow zone, achieving a stable water circulation in the rectification observation area.

[0011] During the fish body measurement process, the mobile flow velocity measuring device can measure the instantaneous flow velocity at multiple points in the rectification observation area. It can directly obtain the real-time water flow velocity in the rectification observation area without additional calculation. Based on the distribution of experimental fish activities, the experimental area can be divided into distribution areas with different flow velocity characteristics. Furthermore, the instantaneous flow velocity at specific target points can be measured by comparing the distribution areas of fish in the rectification observation area.

[0012] Simultaneously, during the fish body measurement process, the fish imaging device can capture real-time images of the target experimental fish's swimming posture and phenotypic characteristics, observe the fish's activity, and identify and record relevant growth traits such as total length, body length, body width, and body height based on the fish's activity. Combined with relevant models, it can achieve analysis of the experimental fish's tail-wagging frequency and growth performance. This eliminates the need for pre- or post-experiment measurements, avoiding stress on the fish.

[0013] Furthermore, an intermediate sealing plate is installed between the water circulation zone and the rectification observation zone, and the intermediate sealing plate is installed on the bottom wall of the water tank.

[0014] This ensures the airtightness between the water circulation zone and the rectification observation zone, preventing water with a certain flow velocity in the water circulation zone from directly affecting the stability of the measurement environment in the rectification observation zone.

[0015] Furthermore, the water circulation zone includes an electric speed regulator and power supply unit, the propeller body, and the propeller support.

[0016] The thruster body is mounted on the thruster bracket, which can be detachably installed between the intermediate sealing plate and the water tank.

[0017] The electric speed regulator and power supply are installed on the outer wall of the water tank and are electrically connected to the propulsion unit.

[0018] Therefore, the electric speed regulator and power supply provide a variable constant voltage power supply to the propeller body, resulting in uniform and stable flow generation. By adjusting the voltage value of the variable constant voltage power supply, the output current can be changed, achieving a stable and uniform change in the propeller body's rotational speed. In this way, different water flow velocities can be generated within the water tank. By comparing the flow velocity measured by the instantaneous water flow velocity measuring unit, the two parameters are compared, achieving precise flow velocity control.

[0019] Furthermore, the distance between the thruster body and the bottom wall of the water tank is H, and the thruster support is adjusted to the size of H along the height direction of the water tank.

[0020] The water level in the water tank should be at least 10cm higher than the propeller body. This allows the height of the propeller support relative to the water tank to be adjusted according to the volume of the water, thereby adjusting the size of H to ensure that the water level is higher than the propeller body.

[0021] Furthermore, the mobile flow velocity measuring mechanism also includes an X-axis slide rail, a Y-axis slide rail, and a Z-axis slide rail;

[0022] Along the length of the water tank, an X-axis slide rail is installed on the top of the water tank and the intermediate sealing plate, respectively;

[0023] Along the width of the water tank, a Y-axis slide rail is slidably connected to two X-axis slide rails;

[0024] Along the height of the water tank, a Z-axis slide rail is slidably connected to the Y-axis slide rail, and the Z-axis slide rail is slidably connected to the instantaneous water flow velocity measuring unit.

[0025] Therefore, when the instantaneous water velocity measuring unit slides on the Z-axis slide rail, the height of the instantaneous water velocity measuring unit in the water can be adjusted along the height direction of the water tank. When the Z-axis slide rail slides relative to the Y-axis slide rail and the Y-axis slide rail slides relative to the X-axis slide rail, the horizontal position of the instantaneous water velocity measuring unit can be adjusted along the length and width directions of the water tank, thereby achieving accurate measurement of the instantaneous water velocity at any position within the rectification observation area.

[0026] Furthermore, the instantaneous water flow velocity measuring unit includes an extension rod and a flow velocity meter probe. One end of the extension rod is equipped with the flow velocity meter probe, and the other end is slidably connected to the Z-axis slide rail.

[0027] Therefore, the extension rod provides a way for the flow meter probe to extend into the water body, which is simple in structure and easy to operate.

[0028] Furthermore, the arc-shaped water tank area includes multiple coaxial and spaced-apart flow-damping plates;

[0029] The flow control plate is semi-circular and fixed to the bottom wall of the water tank. The spacing between two adjacent flow control plates may be the same or different.

[0030] Therefore, water with a certain flow velocity in the water circulation zone enters the channels formed by two adjacent flow-damping plates. If the distance between the two adjacent flow-damping plates is the same, the water can be diverted from the inlet to the outlet and enter the subsequent rectification observation zone through different channels. During diversion, the water velocity at the inlet may increase due to the relatively smaller inlet of the channel. As the diversion progresses, the water will continuously experience resistance due to the friction on the surface of the flow-damping plates and the curvature of the channels, reducing the possibility of turbulence forming before entering the rectification observation zone. If the distance between the two adjacent flow-damping plates is different, the space size of each channel is different. As a result, after the water enters the channel from the inlet, the flow velocity will vary due to the different distances. The narrower the inlet, the greater the instantaneous velocity. Under the premise of a velocity difference, the water at the inlet of the arc-shaped trough can be diverted into different channels, avoiding turbulence at the inlet of the arc-shaped trough. The larger the spacing, the more space the water has to pass through, thus reducing resistance and increasing flow velocity. Conversely, in channels with smaller spacing, the water experiences greater resistance, leading to a decrease in flow velocity. Therefore, water with different velocities gradually converges at the outlet of the arc-shaped flume, better reducing the likelihood of turbulence forming before the water enters the flow observation area.

[0031] Furthermore, the rectification observation area includes a rectification inlet grid and a rectification outlet grid;

[0032] The rectifier inlet grid can be detachably installed between the intermediate sealing plate and the water tank, and is fitted to one end of the flow-slowing plate;

[0033] The rectifier outlet plate can be detachably installed between the intermediate sealing plate and the water tank, and is spaced apart from the rectifier inlet plate.

[0034] Therefore, the rectifier grid is designed to slow down the flow rate of the fluid. The rectifier inlet grid helps to mix water from the arc-shaped water tank area with different velocities. The rectifier inlet grid stabilizes the water flow, and the flow is rectified by the flow guide hole group on the rectifier inlet grid to achieve stable water circulation in the rectification observation area.

[0035] The rectifier exit plate works similarly to the rectifier inlet plate to stabilize the water body about to leave the rectifier observation area, ensuring that the water body in the entire rectifier observation area remains stable during the experiment.

[0036] Furthermore, the device also includes a water tank support, on which the water tank is placed.

[0037] Therefore, the water tank support structure provides support for the water tank, thereby raising the height of the water tank support structure and facilitating observation.

[0038] Furthermore, observation windows facing the rectification observation area are formed on the outer wall of the water tank;

[0039] The fish imaging device includes a top camera, a side camera, a top mounting bracket, and a side mounting bracket. The top mounting bracket is installed on the top of the intermediate sealing plate, and the top camera is mounted on the top mounting bracket and aligned with the rectification observation area. The side mounting bracket is installed on the water tank support, and the side camera is mounted on the side mounting bracket and aligned with the observation window.

[0040] Since the fish's bodies being in the water can cause size errors, top and side cameras are used to photograph and observe the fish in the rectification observation area from two different angles to reduce these errors.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0042] (1) Based on the existing circular swimming lane, this invention divides the water tank into four zones, each with a different flow velocity. This allows for the determination of the swimming ability of target fish in the rectification observation zone, and also enables the instantaneous flow velocity measurement at any point within the rectification observation zone. Furthermore, the machine vision of the fish body imaging device is used to observe the fish in the rectification observation zone, measuring the body length, body width, and suitable flow velocity trend of the target fish. In addition to determining the swimming ability of the fish, this invention also enables the analysis of the body morphology of the target fish.

[0043] (2) This device integrates functions such as autonomous flow propulsion, multi-point flow velocity measurement and behavioral observation. It adopts a modular design, and both the water circulation zone and the rectification observation zone can be easily modified. It can be matched and modified by replacing the corresponding modules for different flow velocities and different swimming fish. Attached Figure Description

[0044] Figure 1 This is a top view of the present invention;

[0045] Figure 2 This is a perspective view of the present invention;

[0046] Figure 3 A schematic diagram illustrating the installation relationship between the thruster body and the thruster support;

[0047] Figure 4 A schematic diagram of the electric speed regulator and power supply unit;

[0048] Figure 5 A schematic diagram illustrating the installation relationship between the mounting plate and the thruster bracket;

[0049] Figure 6 This is a schematic diagram showing the positional relationship between the X-axis slide rail, the Y-axis slide rail, and the Z-axis slide rail;

[0050] Figure 7 This is a diagram illustrating the positions of the top and side cameras.

[0051] Reference numerals: 1. Water tank; 2. Mobile flow velocity measuring mechanism; 21. Instantaneous water flow velocity measuring unit; 211. Extension rod; 212. Flow meter probe; 22. X-axis slide rail; 23. Y-axis slide rail; 24. Z-axis slide rail; 3. Water tank support; 4. Water circulation zone; 41. Electric speed regulation and power supply device; 411. Electric speed regulator; 412. Adjustable power supply box; 42. Thruster body; 43. Thruster support 5. Frame; 5. Arc-shaped water tank area; 51. Flow buffer plate; 6. Rectification observation area; 61. Rectification inlet grid plate; 62. Rectification outlet grid plate; 63. Guide hole; 7. Return flow area; 8. Intermediate sealing plate; 9. Mounting plate; 10. Threaded hole; 11. Reinforcing plate; 12. Fish body imaging device; 121. Top camera; 122. Side camera; 123. Top mounting bracket; 124. Side mounting bracket; 13. Observation window. Detailed Implementation

[0052] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0053] This invention proposes an auxiliary device for measuring and analyzing the swimming ability and traits of fish. It is primarily used in the assessment of swimming ability and behavior in conventionally cultured fish in both freshwater and marine environments, providing a reference for designing aquaculture systems with suitable flow velocity trends. This device divides a traditional circular swimming lane into multiple flow velocity zones and utilizes machine vision to analyze the body morphology of fish within the target observation area. In addition to measuring swimming ability, it also determines the body length, body width, and suitable flow velocity trends of the target fish.

[0054] like Figure 1 As shown, this device includes a water tank 1 and a mobile flow velocity measuring mechanism 2. The water tank 1 can be an existing waist-shaped water tank. The water tank 1 is divided into a water circulation zone 4, an arc-shaped water tank zone 5, a rectification observation zone 6, and a return flow zone 7. The water circulation zone 4, the arc-shaped water tank zone 5, the rectification observation zone 6, and the return flow zone 7 are four different flow velocity zones, which enable the water in the water tank 1 to achieve stable circulation. At the same time, the mobile flow velocity measuring mechanism 2 monitors the water flow in the rectification observation zone 6.

[0055] Because the water in water tank 1 needs to circulate in a regular flow direction, water tank 1, based on its waist-shaped design, is divided circumferentially into a water circulation zone 4, an arc-shaped water tank zone 5, a flow rectification observation zone 6, and a return flow zone 7. Figure 1As can be seen, a central sealing plate 8 is provided in the middle of the water tank 1. The bottom of the central sealing plate 8 is fixedly installed on the bottom wall of the water tank 1. Above the central sealing plate 8 is the water circulation zone 4, and below the central sealing plate 8 is the flow rectification observation zone 6. Due to the setting of the central sealing plate 8, the water circulation zone 4 and the flow rectification observation zone 6 are isolated from each other, ensuring the airtightness between the water circulation zone 4 and the flow rectification observation zone 6. To the left of the central sealing plate 8 is the arc-shaped water tank area 5, and to the right of the central sealing plate 8 is the return flow zone 7.

[0056] In this embodiment, the water in the water tank 1 flows counterclockwise, powered by the water circulation zone 4, causing the water to circulate from the water circulation zone 4 → arc-shaped water tank zone 5 → rectification observation zone 6 → return flow zone 7 → water circulation zone 4. The water circulation zone 4 is connected to the inlet of the arc-shaped water tank zone 5, the outlet of the arc-shaped water tank zone 5 is connected to the inlet of the observation zone, the outlet of the rectification observation zone 6 is connected to the return flow zone 7, and the return flow zone 7 is connected to the arc-shaped water tank zone 5.

[0057] In order to achieve water flow, such as Figure 2 The water circulation zone 4 includes an electric speed regulator and power supply device 41, a propeller body 42, and a propeller support 43. The electric speed regulator and power supply device 41 is installed on the outer wall of the water tank 1, such as... Figure 4 Specifically, it is a cabinet that houses an electric speed controller 411 and an adjustable power supply box 412. The adjustable power supply box 412 provides a variable constant voltage power supply for the electric speed controller 411, such as... Figure 3 The propeller body 42 adopts an impeller-type propeller. The two horizontally arranged propeller bodies 42 are detachably installed between the intermediate sealing plate 8 and the water tank 1 through the propeller bracket 43. The propeller body 42 is electrically connected to the electric speed governor 411.

[0058] When the speed regulator and power supply device supplies power to the propeller body 42, the propeller body 42 starts and rotates to propel the water. According to the change of the variable constant voltage power supply, the voltage value can be adjusted to change the output current of the electric speed regulator 411, so as to achieve a stable and uniform change in the rotation speed of the propeller body 42. In this way, the initial water flow speed of the water circulation zone 4 can be adjusted to achieve autonomous adjustment, thereby generating different water flow speeds in the water tank 1, and meeting the basic requirements of flexibly adjusting the water flow in the swimming environment of fish.

[0059] The propeller body 42 and propeller bracket 43 serve as the propulsion unit providing agitation power. Because traditional swimming ability testing tanks have a limited capacity for measuring the number of target fish, different sizes and species of fish require repeated testing. For different working conditions, different sizes of propulsion units need to be replaced, making the operation cumbersome and significantly affecting the test results. To adapt to the swimming ability testing of fish of different sizes and swimming characteristics, different water flow velocities are adjusted, combined with… Figure 3 and Figure 5 Mounting plates 9 are fixed on the side walls of the intermediate sealing plate 8 and the water tank 1, corresponding to the two sides of the thruster bracket 43. Threaded holes 10 are opened between the mounting plates 9 and the thruster bracket 43. When screws are threaded through the threaded holes 10, the thruster bracket 43 can be installed. If the thruster unit needs to be replaced, the screws can be removed.

[0060] To prevent air from mixing into the water and forming bubbles, the distance between the thruster body 42 and the bottom wall of the water tank 1 is H. The thruster bracket 43 is adjusted along the height direction of the water tank 1 to adjust the size of H. H should be more than 10cm higher than the thruster body 42. For this purpose, a row of spaced threaded holes 10 are opened on the mounting plate 9 along the height direction. The distance between two adjacent threaded holes 10 is not limited. When H is less than 10cm, a suitable mounting hole can be selected on the mounting plate 9 to match the mounting bracket, and then screws can be inserted to adjust the height of the thruster bracket 43 relative to the water tank 1 until the water level is higher than the thruster body 42.

[0061] After a certain amount of water is poured into water tank 1, the water circulation zone 4 provides the power to agitate the water, giving it a certain flow velocity. The water flows to the vicinity of the arc-shaped water tank zone 5, where it enters the arc-shaped water tank zone 5 from the inlet at a higher flow velocity. The arc-shaped water tank zone 5 then stabilizes the agitated water flow. In conjunction with this... Figure 1 and Figure 2 The arc-shaped water tank area 5 includes multiple flow-damping plates 51, each semi-circular in shape and fixed to the bottom wall of the water tank 1. All flow-damping plates 51 are coaxially spaced. Furthermore, along the radial direction of each flow-damping plate 51, a reinforcing plate 11 is connected to all the flow-damping plates 51. Both ends of the reinforcing plate 11 are fixed to the water tank 1, improving the structural stability of the flow-damping plates 51 and the water tank 1. The spacing between adjacent flow-damping plates 51 forms a C-shaped flow channel. Because the flow channel is non-linear, it causes the water flow to bend, and the water may slow down at the bends, thus affecting the flow velocity. The arrangement of multiple flow channels stabilizes the flow of water from the water circulation area 4.

[0062] The spacing between two adjacent flow dampers 51 can be set to be the same, from Figure 2As can be seen, the space of the flow channel closer to the center is smaller. During the process of water flowing from the inlet to the outlet, it can be diverted from different flow channels into the subsequent rectification observation area 6. During the diversion, since the inlet of the flow channel is relatively smaller, the flow velocity of the water at the inlet may increase. As the diversion gradually proceeds, the water will be constantly resisted by the friction of the surface of the flow buffer 51 and the flow channels in different spaces. Moreover, the resistance of different flow channels is different. The larger the space of the flow channel, the greater the resistance to the water. In this way, a water body with a different flow velocity will be generated in each flow channel. Each water body will gradually gather at the outlet of the arc-shaped water tank area 5, reducing the possibility of turbulence forming before the water enters the rectification observation area 6.

[0063] In addition, the spacing between two adjacent flow buffers 51 can also be set differently. Specifically, the spacing of the flow channel closer to the center is larger, and the spacing of the flow channel farther from the center is smaller. Based on the different spacing, the space size of each flow channel is different, and the inlet velocity of the flow channel with different spacing is different. The narrower the inlet, the greater the instantaneous flow velocity. As a result, the flow velocity of the water body will be different due to the different spacing during the process from the inlet end to the outlet end of the arc-shaped water tank area 5.

[0064] Specifically, under the premise of a velocity difference, the water flowing from the water circulation zone 4 to the inlet of the arc-shaped trough zone 5 can be diverted into different channels, avoiding turbulence at the inlet of the arc-shaped trough zone 5. The larger the channel spacing, the more space the water has to pass through, thus reducing resistance and increasing velocity. Conversely, smaller channel spacing results in greater resistance and decreased velocity. Therefore, compared to the case where the spacing between two adjacent flow buffers 51 is the same, further controlling the velocity difference at the inlet of each channel—for example, the channel farthest from the center has a higher inlet velocity but greater resistance during diversion, while the channel closest to the center has a lower inlet velocity but less resistance during diversion—better balances the velocity difference of the water in different channels. This controls the water with different velocities to gradually gather at the outlet of the arc-shaped trough zone 5, further reducing the possibility of turbulence forming before the water enters the rectification observation zone 6.

[0065] The inner surface of the flow depressant 51 is made of a specific material that generates friction on the water, thus affecting the water flow velocity. The greater the friction, the easier it is for the fluid to slow down. Therefore, without affecting the survival of fish, the flow depressant 51 can be made of concrete or cement. Concrete or cement surfaces typically have a certain degree of roughness, which increases the friction between the water and the surface. Alternatively, it can be made of textured or uneven rock, whose natural roughness provides additional friction.

[0066] like Figure 2The rectification observation area 6, serving as the actual measurement area, includes a rectification inlet grid 61 and a rectification outlet grid 62, designed to slow down the fluid flow rate. It typically guides the fluid through a series of resistance objects, holes, or barriers. Both the rectification inlet grid 61 and the rectification outlet grid 62 are matrix-arranged guide tube groups, each forming a guide hole 63. The rectification inlet grid 61 is detachably installed between the intermediate sealing plate 8 and the water tank 1, and is positioned adjacent to the outlet end of the arc-shaped water tank area 5. The top of the rectification inlet grid 61 is bonded to the reinforcing plate 11, the bottom is bonded to the water tank 1, and it is attached to one end of the flow-damping plate 51.

[0067] The rectifier outlet plate 62 and the rectifier inlet plate 61 are spaced apart and located adjacent to the return zone 7, so that a space for placing fish is formed between the rectifier outlet plate 62, the rectifier inlet plate 61 and the intermediate sealing plate 8. The rectifier outlet plate 62 is detachably installed between the intermediate sealing plate 8 and the water tank 1, with another reinforcing plate 11 glued to the top and the bottom glued to the water tank 1.

[0068] It should be noted that the shape of the guide holes 63 on the rectifier inlet grid 61 and the rectifier outlet grid 62 is not limited, and the size of the guide holes 63 on the rectifier inlet grid 61 and the rectifier outlet grid 62 does not need to be consistent. The guide holes 63 can be irregularly shaped holes, gradually increasing or decreasing in size, or holes that first increase in size and then decrease in size, or a baffle strip can be set in the guide holes 63. These shapes are all designed to disturb the water flow and introduce resistance, thereby changing the flow characteristics of the water. The appropriate shape is determined according to the specific application and fluid dynamics requirements.

[0069] Therefore, the guide tube assembly of the rectifying inlet grid 61 and the rectifying outlet grid 62 causes fluid dispersion, turbulence generation, and friction, thereby slowing down the flow velocity. This slowing effect helps reduce the fluid speed, preventing the fluid from passing through the grid too quickly, and also improves the mixing and homogeneity of the water. Thus, the rectifying inlet grid 61 helps mix water from the arc-shaped water tank area 5 at different velocities, and stabilizes the water flow, providing a stable measurement environment for the fish in the rectifying observation area 6. Similarly, the rectifying outlet grid 62 stabilizes the water leaving the rectifying observation area 6, ensuring that the water in the entire rectifying observation area 6 remains stable during the experiment. The water in the rectifying observation area 6 then re-enters the water circulation area 4 through the return zone 7, achieving stable water circulation in the rectifying observation area 6.

[0070] Combination Figure 1 and Figure 6The mobile flow velocity measuring mechanism 2 includes an instantaneous water flow velocity measuring unit 21, an X-axis slide rail 22, a Y-axis slide rail 23, and a Z-axis slide rail 24. The instantaneous water flow velocity measuring unit 21 is located in the rectification observation area 6. With the cooperation of the three slide rails, the instantaneous water flow velocity measuring unit 21 can move along the length, width, and height of the water tank 1.

[0071] Specifically, the instantaneous water flow velocity measuring unit 21 includes an extension rod 211 and a flow velocity meter probe 212, with the flow velocity meter probe 212 installed at one end of the extension rod 211. Along the length of the water tank 1, an X-axis slide rail 22 is installed on the top of the water tank 1 and the intermediate sealing plate 8, respectively. Along the width of the water tank 1, a Y-axis slide rail 23 is slidably connected to the two X-axis slide rails 22. Along the height of the water tank 1, a Z-axis slide rail 24 is slidably connected to the Y-axis slide rail 23. The Z-axis slide rail 24 is slidably connected to the extension rod 211 of the instantaneous water flow velocity measuring unit 21.

[0072] Therefore, when the extension rod 211 of the instantaneous water flow velocity measuring unit 21 slides on the Z-axis slide rail 24, the height of the flow velocity meter probe 212 in the water can be adjusted along the height direction of the water tank 1. When the Z-axis slide rail 24 slides relative to the Y-axis slide rail 23 and the Y-axis slide rail 23 slides relative to the X-axis slide rail 22, the horizontal position of the flow velocity meter probe 212 can be adjusted along the length and width directions of the water tank 1, thereby achieving accurate measurement of the instantaneous water flow velocity at any position within the rectification observation area 6.

[0073] During the measurement of fish swimming, the mobile flow velocity measuring device 2 can measure the instantaneous flow velocity at multiple points in the rectification observation area 6. It can directly obtain the real-time water flow velocity in the rectification observation area 6 without additional calculation. Based on the distribution of experimental fish activities, the experimental area can be divided into distribution areas with different flow velocity characteristics. Furthermore, the instantaneous flow velocity at specific target points can be measured by comparing the distribution areas of fish in the rectification observation area 6.

[0074] Traditional swimming ability testing tanks primarily rely on manual measurements before the experiment to determine the size of the target fish. The related operations during the measurement process can cause stress to the fish, thus affecting the subsequent determination of their swimming behavior and ability. To address this, during the fish swimming ability testing, a fish imaging device 12 is installed in the water chamber 1 at the rectification observation area 6. An observation window 13, facing the rectification observation area 6, is formed on the outer wall of the water chamber 1 to cooperate with the fish imaging device 12. The observation window 13 is made of transparent acrylic sheet and is fixed to the water chamber 1 with double-layer waterproof adhesive and 316 stainless steel screws to prevent water leakage.

[0075] Combination Figure 1 and Figure 7Specifically, the fish imaging device 12 includes a top camera 121, a side camera 122, a top mounting bracket 123, and a side mounting bracket 124. The top mounting bracket 123 is a gantry type and is installed on top of the intermediate sealing plate 8 along the length of the water tank 1. The top camera 121 is mounted on the top mounting bracket 123 and aligned with the flow observation area 6, so that the height of the top camera 121 is higher than that of the flow observation area 6. The side mounting bracket 124 is mounted on the water tank support 3, and the side camera 122 is mounted on the side mounting bracket 124 and aligned with the observation window 13.

[0076] The top camera 121 and the side camera 122 can capture real-time images of the swimming posture and characteristics of the target experimental fish from two different angles, observing the movement of the fish without requiring measurements before or after the experiment, thus avoiding stress on the fish. Based on the movement of the fish, relevant growth characteristics of the target fish, such as total length, body length, body width, and body height, can be identified and recorded.

[0077] It should be noted that the top camera 121 and the side camera 122 can not only record images of the swimming posture and characteristics of fish, but also capture video, such as measuring the swimming speed of fish over short distances. Typically, fish will make short-distance sprints under certain stimuli or inducements, and their speed can be determined through video analysis. Alternatively, they can film fish in the rectifier observation zone 6 where the water flow velocity gradually increases, and measure their swimming tolerance by observing their behavior in the water flow. By combining the data captured by the two cameras with relevant models, the tail-wagging frequency and growth performance of the experimental fish can be analyzed.

[0078] Tail wagging frequency in fish refers to the number or frequency of times they wag their tail fins, usually expressed as the number of waggings per minute. Tail wagging frequency is an important indicator for studying fish behavior and physiological state because it reflects the fish's swimming activity, comfort, and physiological responses. The following are some important aspects related to fish tail wagging frequency:

[0079] Swimming activity level: Tail wagging frequency is generally related to the swimming activity level of fish. A high tail wagging frequency usually indicates that the fish is swimming fast or engaging in vigorous activity, while a low frequency indicates slower swimming or a relatively still state.

[0080] Stress response: The tail wagging frequency of fish can be affected by stressors such as unfamiliar environments, capture, water quality problems, or other threats. Some fish may exhibit abnormal tail wagging frequencies when stressed, which can be used to monitor their stress status.

[0081] Behavioral studies: Tail wagging frequency can also be used to study fish behavior, such as foraging, courtship, risk avoidance, and territorial defense. By monitoring tail wagging frequency, we can better understand their behavioral patterns.

[0082] Although the operating parameters of the thruster body 42 can be adjusted via electric speed regulation and power supply device 41, thereby regulating the initial velocity of the water in the water circulation zone 4 and thus adjusting the flow velocity of the water in the rectification observation zone 6, the slow flow occurs gradually during the water circulation process. When the flow velocity of the water in the rectification observation zone 6 needs to be adjusted rapidly, it is difficult to adjust the flow velocity of the water in the rectification observation zone 6 immediately by controlling the operating parameters of the thruster body 42.

[0083] In this regard, auxiliary equipment for measuring fish swimming ability and analyzing traits also includes a hollow frame-type water tank support 3, such as... Figure 1 Water tank 1 is placed on water tank support 3, which can raise the height of water tank 1, thus creating a height difference. Water tank support 3 is equipped with a lifting part, which is specifically a cylinder. The extension and retraction end of the cylinder is driven to the bottom wall of water tank 1, which is equipped with rectification observation area 6 and return flow area 7.

[0084] Although the operating parameters of the thruster body 42 can be adjusted via electric speed regulation and power supply device 41, thereby regulating the initial velocity of the water in the water circulation zone 4 and thus adjusting the flow velocity of the water in the rectification observation zone 6, the slow flow occurs gradually during the water circulation process. When the flow velocity of the water in the rectification observation zone 6 needs to be adjusted rapidly, it is difficult to adjust the flow velocity of the water in the rectification observation zone 6 immediately by controlling the operating parameters of the thruster body 42.

[0085] Thus, the lifting unit can raise the height of the return zone 7 or the rectification observation zone 6, so that the arc-shaped water tank zone 5 and the rectification observation zone 6 form a height difference. In addition to being slowed down by the arc-shaped water tank zone 5 and the rectification guide plate 61, the water body also needs to overcome the gravitational potential energy brought about by the height difference, which can quickly adjust the water body entering the rectification observation zone 6.

[0086] After the working parameters of the propeller body 42 in the water circulation zone 4 have stabilized for a period of time, and the instantaneous water flow velocity measuring unit 21 detects a decrease in flow velocity, the cylinder can fall, and the water tank 1 can then be horizontally and stably positioned on the water tank support 3 for subsequent measurements.

[0087] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An auxiliary device for measuring and analyzing the swimming ability and traits of fish, comprising a water tank (1), characterized in that, The water tank (1) is divided into a water circulation zone (4), an arc-shaped water tank zone (5), a rectification and observation zone (6), and a return flow zone (7). The water circulation zone (4) and the rectification and observation zone (6) are isolated from each other. The inlet and outlet of the arc-shaped water tank zone (5) are connected to the water circulation zone (4) and the rectification and observation zone (6), respectively. The inlet and outlet of the return flow zone (7) are connected to the rectification and observation zone (6) and the water circulation zone (4), respectively. A fish photography device (12) is installed in the water tank (1) located in the rectification observation area (6); The auxiliary equipment also includes a mobile flow velocity measuring mechanism (2), which is located in the rectification observation area (6) and has an instantaneous water flow velocity measuring unit (21). The instantaneous water flow velocity measuring unit (21) moves along the length, width and height of the water tank (1). The mobile flow velocity measuring mechanism (2) also includes an X-axis slide rail (22), a Y-axis slide rail (23), and a Z-axis slide rail (24); along the length of the water tank (1), an X-axis slide rail (22) is installed on the top of the water tank (1) and the intermediate sealing plate (8); along the width of the water tank (1), a Y-axis slide rail (23) is slidably connected to the two X-axis slide rails (22); along the height of the water tank (1), a Z-axis slide rail (24) is slidably connected to the Y-axis slide rail (23), and the Z-axis slide rail (24) is slidably connected to the instantaneous water flow velocity measuring unit (21); An intermediate sealing plate (8) is provided between the water circulation zone (4) and the rectification observation zone (6). The intermediate sealing plate (8) is installed on the bottom wall of the water tank (1). The auxiliary equipment also includes a water tank support (3). The water tank (1) is placed on the water tank support (3). The water tank support (3) is provided with a lifting part. The lifting part is specifically a cylinder. The extension and retraction end of the cylinder is driven to connect with the bottom wall of the water tank (1) which is provided with the rectification observation zone (6) and the return flow zone (7). An observation window (13) facing the rectification observation zone (6) is formed on the outer wall of the water tank (1). The fish body imaging device (12) includes a top camera (121), a side camera (122), a top mounting bracket (123), and a side mounting bracket (124). The top mounting bracket (123) is installed on the top of the intermediate sealing plate (8). The top camera (121) is mounted on the top mounting bracket (123) and aligned with the flow observation area (6). The side mounting bracket (124) is installed on the water tank support (3). The side camera (122) is mounted on the side mounting bracket (124) and aligned with the observation window (13).

2. The auxiliary equipment for determining fish swimming ability and analyzing traits according to claim 1, characterized in that, The water circulation zone (4) includes an electric speed control and power supply device (41), a propeller body (42), and a propeller support (43); The thruster body (42) is mounted on the thruster bracket (43), and the thruster bracket (43) is detachably installed between the intermediate sealing plate (8) and the water tank (1); The electric speed regulator and power supply unit (41) is installed on the outer wall of the water tank (1) and is electrically connected to the propeller body (42).

3. The auxiliary equipment for measuring and analyzing the swimming ability of fish according to claim 2, characterized in that, The distance between the propeller body (42) and the bottom wall of the water tank (1) is H, and the propeller support (43) adjusts the size of H along the height direction of the water tank (1).

4. The auxiliary equipment for determining and analyzing the swimming ability of fish according to claim 1, characterized in that, The instantaneous water flow velocity measuring unit (21) includes an extension rod (211) and a flow velocity meter probe (212). One end of the extension rod (211) is equipped with the flow velocity meter probe (212), and the other end is slidably connected to the Z-axis slide rail (24).

5. The auxiliary equipment for determining and analyzing the swimming ability of fish according to claim 1, characterized in that, The arc-shaped water tank area (5) includes multiple coaxial and spaced-apart flow-damping plates (51); The flow-slowing plate (51) is semi-circular and fixed to the bottom wall of the water tank (1). The spacing between two adjacent flow-slowing plates (51) may be the same or different.

6. The auxiliary equipment for determining and analyzing the swimming ability of fish according to claim 1, characterized in that, The rectification observation area (6) includes a rectification inlet grid (61) and a rectification outlet grid (62); The rectifier guide plate (61) is detachably installed between the intermediate sealing plate (8) and the water tank (1), and is fitted to one end of the flow-slowing plate (51); The rectifier outlet plate (62) is detachably installed between the intermediate sealing plate (8) and the water tank (1), and is spaced apart from the rectifier inlet plate (61).

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