Fish test tank

Abstract

The present application belongs to the field of fish research equipment, and discloses a fish test water tank, which comprises a water tank body, an inner layer net cage, a hanging bracket, a moving trolley and an aeration pipe. The water tank body has a space required for fish test and sufficient water capacity, and provides sufficient living environment for test fish. The inner layer net cage is arranged in the water tank body, and is used for limiting the activity space of test fish, so that the test fish can only swim in the space of the inner layer net cage. The hanging bracket is arranged on the water tank body, and the inner layer net cage is hung on the hanging bracket, so that the inner layer net cage is arranged in a spaced manner with the water tank body. The space between the inner layer net cage and the water tank body provides a placement space for test equipment. The moving trolley is movably arranged on the water tank body along the circumference of the water tank body, carries and drives various test equipment to move around the water tank body. The aeration pipe is installed on the moving trolley, and is driven by the moving trolley to move in the water tank body, so as to observe the influence of the bubble curtain on the behavior of fish.

Description

Technical Field

[0001] This invention belongs to the technical field of fish research equipment, and more specifically, relates to a fish experimental tank. Background Technology

[0002] In aquaculture and fisheries resource management, bubble curtains, as an important technical facility, play a significant role in controlling fish behavior through their unique physical effects. Bubble curtains mainly consist of perforated aeration pipes installed on the bottom of the water. These pipes continuously discharge compressed air, thereby generating a dense cluster of bubbles rising from the bottom of the water. This process not only produces significant sound and low-frequency pressure vibrations in the water but also creates an upward water flow. These combined effects act on fish, influencing their behavioral patterns from multiple dimensions.

[0003] Specifically, the sound waves and vibrations of the bubble curtain can alert fish, especially when a school of fish approaches. This strong stimulus often causes the fish to change their swimming direction, thus acting as a barrier or deterrent to some extent. Simultaneously, the water flow created during the bubble's ascent also exerts a certain propulsive force on the fish; this physical force can, in some cases, guide the fish to change their swimming trajectory or speed. Therefore, bubble curtains show broad application prospects in preventing the escape of aquatic animals, guiding fish migration, and protecting the ecological balance of specific aquatic areas.

[0004] However, despite the widespread application of bubble curtain technology in practice, in-depth research on its impact on fish behavior has lagged behind. Currently, there is a lack of experimental tanks specifically designed for studying the bubble curtain effect, which to some extent restricts the progress of related scientific research. Traditional tank designs often focus on the static or simple flow states of water, making it difficult to simulate the complex physical scenarios generated by bubble curtains, and therefore unable to meet the need for precise research on the impact of bubble curtains on fish behavior. Summary of the Invention

[0005] The purpose of this application is to provide a fish experimental tank to solve the technical problem that existing tanks cannot meet research needs.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: A fish testing tank is provided, comprising: sink body; An inner mesh cage is disposed within the water tank body; A hanger is straddling the water tank body, and the inner mesh cage is suspended on the hanger, with the inner mesh cage spaced apart from the water tank body; A mobile trolley is movably mounted on the water tank body along the circumference of the water tank body; An aeration pipe is installed on a mobile trolley, with the aeration end of the aeration pipe located at the gap between the water tank body and the inner mesh cage.

[0007] As a further improvement to the above technical solution: Optionally, the water tank body is provided with a guide rail, which is arranged along the circumference of the water tank body, and the mobile trolley is movably connected to the guide rail.

[0008] Optionally, the mobile trolley includes a trolley body and a lifting platform. The trolley body is movably disposed on the water tank body along the circumference of the water tank body, and the lifting platform is connected to one side of the trolley body and located on the outer side of the side wall of the water tank body.

[0009] Optionally, the mobile trolley further includes a rotating arm rotatably connected to the trolley body.

[0010] Optionally, the water tank body is an annular water tank.

[0011] Optionally, the inner and outer ring sidewalls of the annular water tank are each equipped with independently operating mobile trolleys.

[0012] Optionally, the water tank body includes a tank frame and an observation window, the observation window being connected to the tank frame and located on the side wall of the water tank body.

[0013] Optionally, the inner mesh cage includes an inner mesh frame, a light-transmitting window, and a water-permeable mesh. The light-transmitting window is connected to the inner mesh frame and located on the side of the inner mesh cage, and the water-permeable mesh is connected to the bottom surface of the inner mesh frame.

[0014] This application also provides a testing method based on the above-mentioned fish test tank, comprising the following steps: A predetermined number of test fish were placed in the inner net cage of the tank body; Gas is injected into the aeration pipe to form a bubble curtain in the inner mesh cage; The mobile trolley is controlled to move the aeration pipe along the guide rail, and the noise level generated by aeration and the behavior of the test fish are monitored. The effects of controlling different air injection volumes in the aeration pipe, the noise generated by aeration, and different moving speeds of the mobile cart on the fish in the test were recorded. Under the condition that the amount of air injected into the aeration pipe and the amount of noise generated by aeration are constant, the moving trolleys on the inner ring sidewall and the moving trolleys on the outer ring sidewall are controlled to move towards each other, and the behavior of the test fish in front of the bubble curtain is observed. The minimum clamping distance of the bubble curtain on the test fish is obtained based on the behavior of the test fish. Under the condition that the amount of air injected into the aeration pipe and the amount of noise generated by aeration are constant, the test fish are forced into a predetermined area, and the moving trolleys on the inner ring sidewall and the outer ring sidewall are controlled to move in the same direction at a predetermined speed. The transfer effect on the test fish is recorded.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This application provides a fish experimental tank, including a tank body, an inner net cage, a hanger, a moving trolley, and an aeration pipe. The tank body is the outermost structure of the fish experimental tank, containing the necessary space and sufficient water volume for the fish experiments, providing a adequate living environment. The inner net cage is located within the tank body and restricts the activity space of the experimental fish, allowing them to swim only within its confines. Sufficient living space must also be provided within the inner net cage. The hanger spans the tank body, suspending the inner net cage within the tank body, thus creating a gap between the inner net cage and the tank body. This gap provides space for experimental equipment, minimizing interference and ensuring that only experimentally relevant factors influence fish behavior. The moving trolley is movably mounted on the tank body along its circumference; it carries various experimental equipment and moves the equipment around the tank body. The aeration pipe is an experimental component used to generate a bubble curtain that can penetrate the inner mesh cage, thereby influencing fish behavior. The aeration pipe is mounted on a mobile trolley, which moves the aeration pipe within the tank to observe the effect of the bubble curtain on fish behavior. The aeration end of the aeration pipe is positioned at the gap between the tank and the inner mesh cage, which prevents fish from colliding with the aeration pipe and minimizes the interference of the aeration pipe on the fish, ensuring that only the bubble curtain affects fish behavior. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a top view of the fish testing tank of this application. Figure 2 This is a cross-sectional structural schematic diagram of the fish experimental tank of this application; Figure 3 This is a partially enlarged structural diagram of the fish experimental tank of this application. Figure 1 ; Figure 4This is a partially enlarged structural diagram of the fish experimental tank of this application. Figure 2 ; Figure 5 This is a partially enlarged structural diagram of the fish experimental tank of this application. Figure 3 .

[0018] The following are the labeling elements in the figure: 1. Water tank body; 11. Inner ring sidewall; 12. Outer ring sidewall; 13. Tank frame; 14. Observation window; 2. Inner wire mesh cage; 21. Internal network frame; 22. Light-transmitting window; 23. Permeable netting; 3. Hanger; 4. Mobile trolley; 41. Vehicle body; 42. Suspended platform; 43. Swing boom; 5. Aeration pipe; 6. Guide rail. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0024] like Figures 1 to 5 As shown, this application provides a fish experimental tank, including a tank body 1, an inner net cage 2, a hanger 3, a moving trolley 4, and an aeration pipe 5. The tank body 1 is the outermost structure of the fish experimental tank, containing the necessary space and sufficient water volume for the fish experiments, providing a adequate living environment. The inner net cage 2 is located within the tank body 1, restricting the activity space of the experimental fish, allowing them to swim only within its space. The inner net cage 2 must also provide sufficient living space for the fish. The hanger 3 spans the tank body 1, suspending the inner net cage 2 within the tank body 1, thus creating a gap between the inner net cage 2 and the tank body 1. This gap provides space for experimental equipment, minimizing interference and ensuring that only experimentally relevant factors influence fish behavior. A mobile trolley 4 is movably mounted on the tank body 1 along its circumference. The trolley 4 carries various experimental instruments and moves them around the tank body 1. The aeration pipe 5 is an experimental component used to generate a bubble curtain, which can penetrate the inner net cage 2 and thus affect fish behavior. The aeration pipe 5 is mounted on the mobile trolley 4, which moves it within the tank body 1 to observe the effect of the bubble curtain on fish behavior. The aeration end of the aeration pipe 5 is located at the gap between the tank body 1 and the inner net cage 2, preventing fish from colliding with the aeration pipe 5 and minimizing its interference with the fish, ensuring that only the bubble curtain affects fish behavior.

[0025] like Figure 2 As shown, in one embodiment of this application, a guide rail 6 is provided on the water tank body 1. The guide rail 6 is arranged around the circumference of the water tank body 1, and the mobile trolley 4 is movably connected to the guide rail 6. Specifically, the guide rail 6 is located at the top of the water tank body 1, facilitating the movement of the mobile trolley 4 around the water tank body 1. The guide rail 6 provides a stable and reliable movement path for the mobile trolley 4, ensuring that the mobile trolley 4 can move along a predetermined route.

[0026] like Figure 2As shown, in one embodiment of this application, the mobile trolley 4 includes a trolley body 41 and a platform 42. The trolley body 41 is movably mounted on the water tank body 1 along its circumference. The trolley body 41 is connected to the guide rail 6 via rollers at its bottom to reduce resistance and energy consumption during movement. The platform 42 is connected to one side of the trolley body 41 and is located on the outer side of the side wall of the water tank body 1. The platform 42 can carry various experimental components such as experimental instruments or counterweights. The experimental instruments can record the behavior of fish in the inner net cage 2 under the influence of the experimental source. The counterweights can be used to balance the weight of the aeration pipe 5 on the other side, effectively preventing the mobile trolley 4 from tipping over due to uneven load during operation, ensuring the safety and stability of the entire system.

[0027] like Figure 2 As shown, in one embodiment of this application, the mobile trolley 4 further includes a rotating shaft and a rotating arm 43. The rotating shaft is rotatably connected to the trolley body 41, and the rotating arm 43 is connected to the rotating shaft, thereby moving the equipment suspended on the rotating arm 43 to any angle. After the rotating shaft is tightened, the rotating arm 43 will be fixed at a predetermined angle. The rotating arm 43 is located at the top of the mobile trolley 4, and a light source or underwater speaker can be suspended at one end of the rotating arm 43 to form a light source or a noise source. In actual testing, the above-mentioned sources can be turned on individually or in combination. A recorder can also be suspended at this end of the rotating arm 43 to film the behavior of fish in the tank from above; or an illuminance meter can be suspended to measure the brightness generated by the light source; or a hydrophone can be suspended to measure the sound signal generated by the bubble curtain or noise source; or a laser sheet light source can be suspended, and an image recording device can be mounted on the platform 42 to form a particle image velocimetry (PIV) system, which can be used to measure the water velocity field around the bubble curtain. The other end of the rotating arm 43 can also be equipped with a worktable, on which various test components such as test instruments or counterweights can be mounted.

[0028] like Figure 1 As shown, in one embodiment of this application, the water tank body 1 is specifically an annular water tank, thereby providing a space for fish to swim in a circular manner. Similarly, the inner net cage 2 also needs to be an annular net cage to cooperate with the annular water tank and provide a space for fish to swim in a circular manner, so that the experimental fish can swim freely and continuously within the inner net cage 2.

[0029] like Figure 1 and Figure 4As shown, in one embodiment of this application, the inner ring sidewall 11 and outer ring sidewall 12 of the annular water tank are each equipped with an independently operating mobile trolley 4. These two mobile trolleys 4, as two independent working units, operate independently without interfering with each other, and can form two independent and controllable bubble curtains inside the water tank. This allows for adjustment of the position, intensity, and distribution of the bubble curtains according to different experimental requirements, thus providing a variety of experimental modes.

[0030] Furthermore, each mobile cart 4 can carry a variety of different test equipment, which not only enhances the multifunctional testing performance of the test tank but also increases the redundancy and reliability of the equipment. During the test, even if one mobile cart 4 or a piece of test equipment malfunctions, it will not seriously affect the entire test, thus ensuring the continuity and stability of the test.

[0031] like Figure 5 As shown, in one embodiment of this application, the tank body 1 includes a tank frame 13 and an observation window 14. The tank frame 13 serves as the supporting skeleton of the tank body 1 and can be constructed using high-strength steel or durable concrete. The tank frame 13 should be able to withstand the weight of the water, the mobile trolley 4, and other experimental equipment. The observation window 14 is embedded in the tank frame 13 and located on the side wall of the tank body 1. The observation window 14 is composed of transparent tempered glass or plexiglass, ensuring that researchers can clearly observe the behavior of fish inside the tank. Through the observation window 14, key information such as the swimming trajectory and behavioral patterns of the fish can be directly monitored, providing data support for fish behavior research.

[0032] like Figure 5 As shown, in one embodiment of this application, the inner net cage 2 includes an inner net frame 21, a light-transmitting window 22, and a water-permeable net 23. The inner net frame 21 can be constructed using a lightweight steel structure or an aluminum alloy structure to reduce the load on the hanger 3. The light-transmitting window 22 is connected to the inner net frame 21 and located on the side of the inner net cage 2. The light-transmitting window 22 is composed of transparent tempered glass, plexiglass, or mesh to allow for direct monitoring of fish behavior. The water-permeable net 23 is connected to the bottom surface of the inner net frame 21. The water-permeable net 23 must ensure the smooth passage of the bubble curtain while also intercepting the experimental fish to prevent them from escaping to the gap between the tank body 1 and the inner net cage 2.

[0033] This application also provides a test method for the fish test tank in the above embodiments, and the specific test steps are as follows: A predetermined number of test fish, typically ranging from 10 to 40, are placed in the inner mesh cage 2 of the tank body 1 to ensure the statistical significance and representativeness of the experimental results. Compressed air is then injected through the aeration pipe 5, with the gas flow rate controlled between 20 L / min and 160 L / min per unit width, to form a uniform and stable bubble curtain within the inner mesh cage 2. To precisely control the experimental conditions, a first mobile trolley 4 moves along the guide rail 6, driving the aeration pipe 5 at a constant or variable speed. During this process, the noise level generated by aeration is monitored in real time, and the behavioral changes of the test fish, including swimming trajectories, group distribution, and stress responses, are recorded using a high-definition camera. Simultaneously, a second mobile trolley 4 maintains a certain distance ahead of the first mobile trolley 4 in its direction of travel; this distance is typically 1 to 4 times the width of the tank. A high-sensitivity hydrophone is mounted on the second mobile trolley 4 via a rotating arm 43 to measure the noise spectrum and sound pressure level generated by the bubble curtain, and the data is transmitted in real time to a recorder via a wireless transmission system. Both mobile carts 4 are equipped with high-precision recorders to simultaneously record the behavioral data of fish near and in front of the bubble curtain. By comparing and analyzing the fish behavior under different air injection volumes, noise levels, and movement speeds, the repelling effect of the bubble curtain on the test fish can be systematically evaluated. During the experiment, the air injection volume and movement speed can be adjusted according to the experimental needs.

[0034] In one embodiment of this application, under the condition that the air injection volume and the noise generated by aeration in the aeration pipe 5 are kept constant, the moving trolley 4 on the inner ring sidewall 11 and the moving trolley 4 on the outer ring sidewall 12 are controlled to move in opposite directions, while the behavioral changes of the test fish in front of the bubble curtain are observed in real time. By recording the swimming trajectory, group distribution, and stress response of the fish during the approach of the bubble curtain, the minimum clamping distance at which the bubble curtain effectively drives away the test fish is analyzed and determined. The determination of this minimum clamping distance is based on the behavioral threshold of the fish when approaching the bubble curtain, such as the distance when the fish begin to significantly change their swimming direction or accelerate to escape. The moving speed of the moving trolley 4 adopts the optimal moving speed measured by experiments in the above embodiment to ensure the scientific nature and repeatability of the experimental conditions.

[0035] In one embodiment of this application, under the condition that the air injection volume in the aeration pipe 5 and the noise generated by aeration are kept constant, the test fish are driven and forced into a predetermined area within the tank body 1 to ensure the controllability and consistency of the test environment. Subsequently, the moving trolleys 4 on the inner ring sidewall 11 and the outer ring sidewall 12 are controlled to move in the same direction at the same predetermined speed to simulate the continuous driving effect of the bubble curtain on fish in practical applications. During this process, the swimming trajectory, group distribution, behavioral changes, and acoustic response of the test fish are monitored and recorded in real time using high-definition camera equipment and hydrophones to evaluate the transfer effect of the bubble curtain on the fish. The predetermined speed of the moving trolleys 4 is optimized and determined based on previous experimental data to ensure maximization of driving efficiency and minimization of fish stress response. By systematically analyzing the transfer behavior of the test fish under the action of the bubble curtain, the driving efficiency of the bubble curtain can be accurately quantified, and a scientific basis can be provided for parameter optimization in practical applications.

[0036] In other embodiments of this application, the mobile vehicle 4 may be further equipped with a light source or an underwater speaker as additional influencing sources to study the behavioral responses of the test fish under different environmental stimuli. The light source may be an LED light group with different wavelengths and intensities to simulate natural light or light environments under specific spectral conditions; the underwater speaker can play sound signals with specific frequencies and sound pressure levels to simulate underwater noise or specific acoustic environments. By controlling parameters such as the switching frequency of the light source, the light intensity, or the sound frequency and sound pressure level of the underwater speaker, the behavioral changes of the test fish under the influence of multiple influencing sources can be studied, including but not limited to swimming trajectories, group distribution, phototaxis, or acoustic avoidance responses, thereby more realistically simulating actual application scenarios and providing a basis for optimizing driving strategies.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fish experimental tank, characterized in that, include: The water tank body (1) has an inner ring sidewall (11) and an outer ring sidewall (12), and the inner ring sidewall (11) and the outer ring sidewall (12) enclose each other to form an annular water tank; The inner mesh cage (2) is located in the annular water tank of the water tank body (1), and the inner mesh cage (2) is spaced apart from the inner ring sidewall (11) and the outer ring sidewall (12); A hanger (3) is straddling the water tank body (1), and the inner mesh cage (2) is suspended on the hanger (3); Two mobile trolleys (4) run independently along the circumference of the inner ring sidewall (11) and the outer ring sidewall (12), respectively; Aeration pipes (5) are installed on two mobile carts (4), and the aeration end of the aeration pipes (5) is located at the gap between the water tank body (1) and the inner mesh cage (2). Among them, the two mobile trolleys (4) can move in opposite directions in a controlled manner to determine the minimum squeezing distance that effectively drives away the test fish under the synergistic squeezing effect of the two bubble curtains generated by the two aeration pipes (5); the two mobile trolleys (4) can also move in the same direction in a controlled manner to transfer the test fish across the predetermined interval.

2. The fish experimental tank as described in claim 1, characterized in that, The water tank body (1) is provided with a guide rail (6), which is arranged along the circumference of the water tank body (1). The mobile trolley (4) is movably connected to the guide rail (6).

3. The fish experimental tank as described in claim 1, characterized in that, The mobile trolley (4) includes a trolley body (41) and a lifting platform (42). The trolley body (41) is movably disposed on the water tank body (1) along the circumference of the water tank body (1). The lifting platform (42) is connected to one side of the trolley body (41) and is located on the outside of the side wall of the water tank body (1).

4. The fish experimental tank as described in claim 3, characterized in that, The mobile trolley (4) also includes a rotating arm (43), which is rotatably connected to the vehicle body (41).

5. The fish experimental tank as described in any one of claims 1 to 4, characterized in that, The water tank body (1) includes a tank frame (13) and an observation window (14), the observation window (14) being connected to the tank frame (13) and located on the side wall of the water tank body (1).

6. The fish experimental tank as described in any one of claims 1 to 4, characterized in that, The inner mesh cage (2) includes an inner mesh frame (21), a light-transmitting window (22) and a water-permeable mesh (23). The light-transmitting window (22) is connected to the inner mesh frame (21) and located on the side of the inner mesh cage (2). The water-permeable mesh (23) is connected to the bottom surface of the inner mesh frame (21).

7. A test method based on a fish test tank as described in any one of claims 1 to 6, characterized in that, Includes the following steps: A predetermined number of test fish were placed in the inner net cage (2) of the tank body (1); Gas is injected into the aeration pipe (5) to form a bubble curtain in the inner mesh cage (2); The control trolley (4) drives the aeration pipe (5) to move along the guide rail (6), and monitors the noise generated by aeration and the behavior of the test fish. By controlling different air injection volumes in the aeration pipe (5), the noise generated by aeration, and different moving speeds of the moving trolley (4), the effects of driving away the test fish were recorded. Under the condition that the amount of air injected into the aeration pipe (5) and the amount of noise generated by aeration are constant, the moving trolley (4) on the inner ring sidewall (11) and the moving trolley (4) on the outer ring sidewall (12) are controlled to move towards each other, and the behavior of the test fish in front of the bubble curtain is observed. The minimum clamping distance of the bubble curtain on the test fish is obtained based on the behavior of the test fish. Under the condition that the amount of air injected into the aeration pipe (5) and the amount of noise generated by aeration are constant, the test fish are squeezed into the predetermined range, and the moving trolley (4) on the inner ring sidewall (11) and the moving trolley (4) on the outer ring sidewall (12) are controlled to move in the same direction at a predetermined speed, and the transfer effect on the test fish is recorded.

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