Zooplankton trapping and monitoring device and working method

Abstract

The invention belongs to the field of biological trapping and monitoring devices, and discloses a zooplankton trapping and monitoring device and a working method, and the zooplankton trapping and monitoring device comprises a trapping structure, a screening structure and a negative pressure generation structure. The capturing structure comprises a capturing bin body and a capturing inlet formed in the capturing bin body, and the capturing inlet is used for guiding zooplankton to enter the capturing bin body. The screening structure comprises a screening bin body, a one-way valve and a screen. The one-way valve is installed at an inlet of the screening bin body and used for controlling the communication state between the screening bin body and the capturing bin body. When the one-way valve is opened, the screening bin body is communicated with the capturing bin body, and zooplankton collected in the capturing bin body enters the screening bin body under the action of negative pressure; the screen is arranged in the screening bin body and divides the screening bin body into a plurality of bin bodies in sequence. The negative pressure generating structure communicates with the screening bin body and is used for generating a negative pressure environment in the screening bin body. When the negative pressure generating structure works, zooplankton in the capturing bin body is sucked into the screening bin body under the action of negative pressure.

Description

Technical Field

[0001] The invention belongs to the technical field of biological trapping and monitoring devices, and more specifically, relates to a zooplankton trapping and monitoring device and a working method. Background Art

[0002] Marine zooplankton, as an important component of the marine ecosystem, is not only the main food source for many marine organisms, but also plays a key role in maintaining marine ecological balance and biodiversity. In recent years, with the intensification of global climate change, marine pollution and other issues, the distribution and number of marine zooplankton have changed significantly. Therefore, how to monitor the dynamics of zooplankton has become an important task in marine ecological research.

[0003] At present, the monitoring methods for zooplankton mainly include traditional trawling, optical observation and acoustic detection technologies. However, these methods have many limitations in practical applications. For example, traditional trawling devices are usually designed to capture larger or specific target species. For zooplankton that are small, dispersed and susceptible to environmental influences, the capture efficiency is low and it is easy to cause sample damage or distortion. In addition, most of the existing fishing devices rely on manual operation and lack efficient automation mechanisms, making it difficult to achieve long-term and large-scale continuous monitoring, especially in deep-sea environments, which further increases the difficulty and cost of operation. Summary of the invention

[0004] The purpose of the present application is to provide a zooplankton trapping and monitoring device and a working method to solve the technical problem of difficulty in capturing zooplankton in the prior art.

[0005] To achieve the above purpose, the technical solution adopted in this application is: Provided is a zooplankton trapping and monitoring device, comprising: A capture structure, comprising a capture chamber body having a capture inlet; The sub-screening structure comprises a sub-screening bin, a one-way valve and a screen; the one-way valve is installed at the entrance of the sub-screening bin, and when the one-way valve is opened, the sub-screening bin is connected with the capture bin; the screen is arranged in the sub-screening bin to divide the sub-screening bin into a plurality of bins in sequence; The negative pressure generating structure is connected to the screening bin body, and is used to generate negative pressure so that the zooplankton entering the capture bin body is sucked into the screening bin body.

[0006] As a further improvement of the above technical solution: Optionally, there are multiple screens, and the mesh size of each screen is arranged to decrease in sequence along the direction from the inlet of the sub-screening bin to the negative pressure generating structure.

[0007] Optionally, there are multiple sub-screening structures, each of which is connected to the capture structure, and the number of the negative pressure generating structures corresponds to the number of the sub-screening structures.

[0008] Optionally, the negative pressure generating structure includes a negative pressure generating chamber body and a piston, the inlet end of the negative pressure generating chamber body is connected to the screening chamber body, and the piston is slidably connected to the negative pressure generating chamber body. When the piston slides away from the inlet end of the negative pressure generating chamber body, the negative pressure generating chamber body generates negative pressure.

[0009] Optionally, the negative pressure generating structure also includes an elastic member, one end of which is connected to the negative pressure generating chamber body, and the other end of the elastic member is connected to the piston, and the elastic member is used to drive the piston to slide away from the inlet end of the negative pressure generating chamber body.

[0010] Optionally, the negative pressure generating structure further comprises a piston rod and an unlocking member, wherein the first end of the piston rod is connected to the piston, the second end of the piston rod extends out of the negative pressure generating chamber body, and the second end of the piston rod has a slot; Optionally, when the unlocking member is locked against the slot, the piston rod and the piston are locked; when the unlocking member is withdrawn from the slot, the elastic member drives the piston to slide away from the inlet end of the negative pressure generating chamber.

[0011] Optionally, the bottom of the capture bin is conical, and the small diameter end of the conical bin is connected to the screening bin.

[0012] Optionally, the capture structure further includes a bait disposed in the capture chamber.

[0013] Optionally, the capture structure further includes a camera and / or a lighting fixture disposed on the capture bin body, wherein the lens of the camera faces the inner side of the capture bin body, and the lighting fixture is used to illuminate the inner side of the capture bin body.

[0014] Optionally, the zooplankton trapping and monitoring device also includes an environmental monitor disposed on the capture structure.

[0015] The present application also provides a working method of a zooplankton trapping and monitoring device, comprising the following steps: Put bait into the capture chamber of the capture structure; compress the elastic member in the negative pressure generating structure and lock the piston rod on the unlocking member; The zooplankton trapping and monitoring device is placed in waters of a predetermined depth; the image of the zooplankton entering the capture chamber is recorded by a camera on the capture chamber; When the number of zooplankton entering the capture bin reaches a certain amount, or the zooplankton trapping and monitoring device is arranged for a predetermined time, the unlocking member releases the piston rod, and the piston moves under the push of the elastic member, thereby generating negative pressure to suck the zooplankton in the capture bin into the screening bin; After the piston stops moving, the one-way valve is closed, and the zooplankton is isolated by the screen and distributed in the corresponding interval of the screening bin, thus completing the capture of the zooplankton.

[0016] As a further improvement of the above technical solution: Optionally, when there are multiple sub-screening bins, each sub-screening bin is connected to the capturing bin, and each negative pressure generating structure is started in sequence after a set time interval.

[0017] Compared with the prior art, the beneficial effects of this application are: The zooplankton trapping and monitoring device provided by the present application includes a capture structure, a sub-screening structure and a negative pressure generating structure. The capture structure includes a capture bin and a capture inlet arranged on the capture bin, and the capture inlet is used to guide zooplankton into the capture bin. The capture inlet can be set to multiple to expand the capture range and improve the capture efficiency. The capture bin serves as a preliminary collection area for zooplankton, which can effectively accommodate the zooplankton entering while avoiding mechanical damage to the zooplankton. The sub-screening structure includes a sub-screening bin, a one-way valve and a screen. The one-way valve is installed at the inlet of the sub-screening bin to control the connection state between the sub-screening bin and the capture bin. When the one-way valve is opened, the sub-screening bin is connected to the capture bin, and the zooplankton collected in the capture bin enters the sub-screening bin under the action of negative pressure; when the one-way valve is closed, the channel between the sub-screening bin and the capture bin is blocked, thereby preventing the zooplankton in the sub-screening bin from flowing back to the capture bin, ensuring the unidirectionality and high efficiency of the capture process. The screen is arranged inside the screening bin, and the screening bin is divided into a plurality of independent bins in turn. The zooplankton of different types or sizes is graded and collected by the screen. The negative pressure generating structure is connected to the screening bin, and is used to generate a negative pressure environment in the screening bin. When the negative pressure generating structure is working, the zooplankton in the capture bin is sucked into the screening bin under the action of negative pressure, thereby achieving the capture of the zooplankton and effectively reducing the mechanical damage to the zooplankton.

[0018] The zooplankton trapping and monitoring device of the present application realizes the automated capture of zooplankton in a deep-sea environment through the synergistic effect of a capture structure, a screening structure and a negative pressure generating structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a cross-sectional structural schematic diagram of the first zooplankton trapping and monitoring device of the present application; Figure 2 It is a cross-sectional structural schematic diagram of the second zooplankton trapping and monitoring device of the present application; Figure 3 It is a structural schematic diagram of a first working state of the second zooplankton trapping and monitoring device of the present application; Figure 4 It is a structural schematic diagram of the second working state of the second zooplankton trapping and monitoring device of the present application; Figure 5 It is a structural schematic diagram of the third working state of the second zooplankton trapping and monitoring device of the present application; Figure 6 It is a cross-sectional structural schematic diagram of the third zooplankton trapping and monitoring device of the present application; Figure 7 It is a top view structural schematic diagram of the third zooplankton trapping and monitoring device of the present application; Figure 8 It is a schematic cross-sectional structure diagram of the fourth zooplankton trapping and monitoring device of the present application.

[0021] Among them, the reference numerals in the figure are: 1. Capture structure; 11. Capture entrance; 12. Capture chamber; 13. Bait; 14. Camera; 15. Lighting lamp; 2. Screening structure; 21. Screening chamber; 22. One-way valve; 23. Screen; 3. Negative pressure generating structure; 31. Negative pressure generating chamber; 32. Piston; 33. Elastic part; 34. Piston rod; 341. Slot; 35. Unlocking part; 4. Environmental monitor. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] Unless otherwise defined, all professional terms used below have the same meaning as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of this application.

[0027] like Figure 1As shown, the present application provides a zooplankton trapping and monitoring device, including a capture structure 1, a screening structure 2 and a negative pressure generating structure 3. The capture structure 1 includes a capture bin 12 and a capture inlet 11 arranged on the capture bin 12, and the capture inlet 11 is used to guide the zooplankton into the capture bin 12. The capture inlet 11 can be set to multiple to expand the capture range and improve the capture efficiency. The capture bin 12 serves as a preliminary collection area for zooplankton, which can effectively accommodate the entering zooplankton while avoiding mechanical damage to the zooplankton. The screening structure 2 includes a screening bin 21, a one-way valve 22 and a screen 23. The one-way valve 22 is installed at the inlet of the screening bin 21, and is used to control the connection state between the screening bin 21 and the capture bin 12. When the one-way valve 22 is opened, the screening bin 21 is connected to the capture bin 12, and the zooplankton collected in the capture bin 12 enters the screening bin 21 under the action of negative pressure; when the one-way valve 22 is closed, the passage between the screening bin 21 and the capture bin 12 is blocked, thereby preventing the zooplankton in the screening bin 21 from flowing back to the capture bin 12, ensuring the unidirectionality and high efficiency of the capture process. The screen 23 is arranged inside the screening bin 21, and the screening bin 21 is divided into a plurality of independent bins in turn, and zooplankton of different types or sizes is graded and collected by the screen 23. The negative pressure generating structure 3 is connected to the screening bin 21, and is used to generate a negative pressure environment in the screening bin 21. When the negative pressure generating structure 3 is working, the zooplankton in the capture bin 12 is sucked into the screening bin 21 under the action of negative pressure, thereby realizing the capture of zooplankton and effectively reducing the mechanical damage to the zooplankton.

[0028] The zooplankton trapping and monitoring device of the present application realizes the automated capture of zooplankton in a deep-sea environment through the coordinated action of the capture structure 1, the screening structure 2 and the negative pressure generating structure 3.

[0029] like Figure 2As shown, in a specific embodiment of the present application, the number of screens 23 is set to be multiple, and the mesh size of each screen 23 decreases in sequence along the direction from the entrance of the sub-screening bin 21 to the negative pressure generating structure 3. This hierarchical design enables the sub-screening bin 21 to screen step by step according to the size differences of zooplankton, thereby achieving accurate classification of zooplankton of different sizes. Specifically, the screen 23 near the entrance of the sub-screening bin 21 adopts a larger mesh size to intercept zooplankton of larger size; the mesh size of the screen 23 in the middle layer is moderate, which is used to screen zooplankton of medium size; and the screen 23 near the negative pressure generating structure 3 adopts a smaller mesh size to capture zooplankton of the smallest size. Through this hierarchical screening mechanism, the device can accurately divide zooplankton into multiple categories according to the size range, and store them in different areas of the sub-screening bin 21 respectively, so as to improve the precision and accuracy of zooplankton sampling. In addition, the hierarchical screening design also reduces the mutual interference between zooplankton of different sizes, avoids sample mixing, and thus improves the overall performance and practicality of the device.

[0030] like Figure 6 and Figure 7 As shown, in a specific embodiment of the present application, there are multiple sub-screening structures 2, each of which is connected to the capture structure 1, and the number of negative pressure generating structures 3 corresponds to the number of sub-screening structures 2, and each negative pressure generating structure 3 is also connected to the corresponding sub-screening structure 2. Each negative pressure generating structure 3 is started in sequence according to a set time interval. This timing control mechanism can effectively avoid the pressure interference caused by the simultaneous operation of multiple negative pressure generating structures 3, thereby ensuring that each sub-screening structure 2 can operate independently. The sub-screening structures 2 are arranged in a circular arrangement on the periphery of the capture structure 1, which not only optimizes the space utilization, but also enables each sub-screening structure 2 to share the same capture structure 1, thereby simplifying the overall structure of the device and reducing the manufacturing cost.

[0031] like Figures 3 to 5 As shown, in a specific embodiment of the present application, the negative pressure generating structure 3 includes a negative pressure generating chamber 31 and a piston 32. The inlet end of the negative pressure generating chamber 31 is connected to the sub-screening chamber 21, so that the space in the sub-screening chamber 21 can form a fluid connection with the negative pressure generating chamber 31. The piston 32 is slidably arranged inside the negative pressure generating chamber 31, and its sliding direction is consistent with the axial direction of the negative pressure generating chamber 31. When the piston 32 slides away from the inlet end of the negative pressure generating chamber 31, the volume in the negative pressure generating chamber 31 increases, thereby generating a negative pressure environment in the sub-screening chamber 21. This negative pressure effect can suck the zooplankton in the capture chamber 12 into the sub-screening chamber 21, thereby achieving efficient capture of zooplankton. The working process of the negative pressure generating structure 3 causes less damage to the zooplankton, can effectively maintain the integrity and activity of the sample, and provide high-quality sample data for subsequent scientific research.

[0032] like Figures 3 to 5 As shown, in a specific embodiment of the present application, the negative pressure generating chamber 31 can be directly connected to the screening chamber 21; or, as shown in FIG. Figure 8 As shown, the negative pressure generating bin body 31 is connected to the sub-screening bin body 21 via a conduit. This arrangement is beneficial to reducing the overall height of the device and reducing the effects of vibration between the negative pressure generating structures 3.

[0033] like Figures 3 to 5 As shown, in a specific embodiment of the present application, the negative pressure generating structure 3 also includes an elastic member 33, one end of the elastic member 33 is connected to the negative pressure generating chamber body 31, and the other end of the elastic member 33 is connected to the piston 32, and the elastic member 33 is used to drive the piston 32 to slide away from the inlet end of the negative pressure generating chamber body 31. When the piston 32 is subjected to an external force and moves toward the inlet end of the negative pressure generating chamber body 31, the elastic member 33 is compressed and stores elastic potential energy; when the external force is released, the elastic member 33 uses its stored elastic potential energy to drive the piston 32 to slide in the direction away from the inlet end, thereby generating a negative pressure environment in the negative pressure generating chamber body 31. The elastic member 33 can be made of a spring or other material with elastic recovery characteristics, and its elastic coefficient can be adjusted according to actual needs to ensure that the sliding speed of the piston 32 and the negative pressure generation effect meet the requirements of zooplankton capture. In addition, the introduction of the elastic member 33 enables the negative pressure generating structure 3 to work without external power input, simplifies the structure of the negative pressure generating structure 3, and reduces the energy consumption and operating cost of the device.

[0034] like Figures 3 to 5 As shown, in a specific embodiment of the present application, the cross-sectional area of ​​the piston 32 is larger than the cross-sectional area of ​​the screening bin body 21. This size difference enables the piston 32 to generate a greater negative pressure effect in the negative pressure generating bin body 31 during the sliding process, thereby enhancing the suction force on the zooplankton in the screening bin body 21. When the piston 32 slides away from the inlet end of the negative pressure generating bin body 31, due to the larger cross-sectional area of ​​the piston 32, the volume change generated by its unit displacement also increases accordingly, thereby significantly improving the working efficiency of the negative pressure generating structure 3, not only ensuring that the zooplankton is quickly and effectively sucked into the screening bin body 21, but also reducing the sliding stroke of the piston 32, thereby optimizing the overall structural layout of the device.

[0035] like Figures 3 to 5As shown, in a specific embodiment of the present application, the negative pressure generating structure 3 further includes a piston rod 34 and an unlocking member 35. The first end of the piston rod 34 is fixedly connected to the piston 32, and the second end extends to the outside of the negative pressure generating chamber 31, and a card slot 341 is provided at its end. The unlocking member 35 is used to control the movement state of the piston rod 34 and the piston 32. When the lock tongue of the unlocking member 35 is clamped in the card slot 341, the piston rod 34 and the piston 32 are locked and cannot move; when the lock tongue of the unlocking member 35 withdraws from the card slot 341, the elastic member 33 releases its stored elastic potential energy, driving the piston 32 to slide away from the inlet end of the negative pressure generating chamber 31, thereby generating negative pressure in the negative pressure generating chamber 31. The unlocking member 35 can be specifically implemented by an electromagnetic lock. In the initial state, by pressing the second end of the piston rod 34, the elastic member 33 is compressed and stores elastic potential energy until the lock tongue of the electromagnetic lock is clamped in the card slot 341, completing the locking of the piston rod 34 and the piston 32. When the negative pressure generating structure 3 needs to be activated, the electromagnetic lock is energized, the lock tongue contracts and withdraws from the slot 341, and the elastic member 33 then drives the piston 32 to slide, thereby generating negative pressure.

[0036] like Figure 2 As shown, in a specific embodiment of the present application, the bottom of the capture bin 12 is a conical structure, and the small diameter end of the conical bin is connected to the screening bin 21. When the negative pressure generating structure 3 is working, the tapered structure of the conical bin helps to concentrate and amplify the negative pressure effect, thereby enhancing the suction force on zooplankton. At the same time, the large diameter end of the conical bin expands the effective suction range, so that more zooplankton can be efficiently sucked into the capture bin 12. In addition, the conical structure can also guide the zooplankton to flow in the direction of the screening bin 21, reducing its retention time in the capture bin 12.

[0037] like Figure 2 As shown, in a specific embodiment of the present application, the capture structure 1 also includes a bait 13 disposed inside the capture chamber 12. The bait 13 is used to attract zooplankton to actively enter the capture chamber 12, thereby improving the capture efficiency. The bait 13 can be selected according to the type and habits of the target zooplankton, such as using a specific type of phytoplankton, chemical attractants or other biologically active substances. The arrangement position and release method of the bait 13 must ensure that it can be evenly diffused to the surrounding waters of the capture chamber 12 to form an effective attraction area.

[0038] like Figure 2As shown, in a specific embodiment of the present application, the capture structure 1 also includes a camera 14 and / or an illuminator 15 disposed on the capture bin 12. The lens of the camera 14 faces the inner side of the capture bin 12, and is used to monitor the activities of zooplankton in the capture bin 12 in real time. The camera 14, in combination with the camera system, image processing algorithm and computer vision technology, is capable of real-time identification and analysis of zooplankton entering the capture bin 12. Through target detection and image classification technology, the camera 14 can distinguish different types of zooplankton and record data such as their quantity, size and movement behavior. The illuminator 15 is installed on the inner side or periphery of the capture bin 12 to provide sufficient lighting for the camera 14 under low light conditions to ensure the clarity and accuracy of image acquisition.

[0039] like Figure 2 As shown, in a specific embodiment of the present application, the device also includes an environmental monitor 4 disposed on the capture structure 1. The environmental monitor 4 is used to collect ecological environmental parameters of the water area where the capture structure 1 is located in real time, including key indicators such as temperature, salinity, pH value, dissolved oxygen, etc. These parameters are continuously monitored by the sensor module, and the data is transmitted to the data processing unit for recording and analysis, providing auxiliary data for the behavior research of zooplankton.

[0040] The present application also provides a working method of a zooplankton trapping and monitoring device, comprising the following steps: The capture chamber 12 of the capture structure 1 is filled with bait 13 , and the bait 13 is selected according to the type and habits of the target zooplankton to attract the zooplankton to actively enter the capture chamber 12 .

[0041] In addition, the elastic member 33 in the negative pressure generating structure 3 is compressed to move the piston rod 34 to the locked position, and the piston rod 34 is fixed by the unlocking member 35. At this time, the elastic member 33 is in an energy storage state. After the zooplankton trapping and monitoring device is placed in the waters of a predetermined depth, the camera 14 on the capture chamber 12 begins to record the zooplankton images entering the capture chamber 12 in real time, and combines image processing and computer vision technology to identify and analyze the zooplankton. At the same time, the environmental monitor 4 collects ecological and environmental parameters such as temperature, salinity, pH value, dissolved oxygen, etc. of the waters in real time to provide auxiliary data for the behavior research of zooplankton.

[0042] When the number of zooplankton entering the capture chamber 12 reaches a preset threshold, or the device is placed in the water area for a predetermined time, the unlocking member 35 releases the piston rod 34. The piston 32 moves under the elastic potential energy of the elastic member 33, thereby generating negative pressure in the negative pressure generating chamber 31, and sucking the zooplankton in the capture chamber 12 into the screening chamber 21.

[0043] If there are multiple screening structures 2, each screening structure 2 is connected to the capture structure 1, and each negative pressure generating structure 3 is started in sequence at a set time interval to ensure that each screening structure 2 can independently and efficiently complete the capture and screening of zooplankton.

[0044] When the piston 32 stops moving, the one-way valve 22 is closed to prevent the zooplankton in the screening bin 21 from flowing back to the capture bin 12. Under the grading and screening action of the screen 23, the zooplankton is distributed to the corresponding intervals of the screening bin 21 according to its size, completing the capture and classification of the zooplankton.

[0045] Through the above steps, efficient trapping, precise screening and real-time monitoring of zooplankton are achieved.

[0046] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A zooplankton trapping and monitoring device, characterized in that: include: A capture structure (1) comprising a capture chamber (12) having a capture inlet (11); The screening structure (2) comprises a screening bin body (21), a one-way valve (22) and a screen (23); the one-way valve (22) is installed at the entrance of the screening bin body (21); when the one-way valve (22) is opened, the screening bin body (21) is connected to the capture bin body (12); the screen (23) is arranged in the screening bin body (21) to sequentially divide the screening bin body (21) into a plurality of bins; The negative pressure generating structure (3) is in communication with the screening bin body (21), and the negative pressure generating structure (3) is used to generate negative pressure so that zooplankton entering the capture bin body (12) is sucked into the screening bin body (21).

2. The zooplankton trapping and monitoring device according to claim 1, characterized in that: There are a plurality of sieves (23), and the mesh size of each sieve (23) is arranged to decrease in sequence along the direction from the inlet of the sub-screening bin body (21) to the negative pressure generating structure (3).

3. The zooplankton trapping and monitoring device according to claim 1, characterized in that: The number of the sub-screening structures (2) is plural, each of the sub-screening structures (2) is connected to the capture structure (1), and the number of the negative pressure generating structures (3) corresponds to the number of the sub-screening structures (2).

4. The zooplankton trapping and monitoring device according to claim 1, characterized in that: The negative pressure generating structure (3) comprises a negative pressure generating chamber body (31) and a piston (32); the inlet end of the negative pressure generating chamber body (31) is in communication with the screening chamber body (21); the piston (32) is slidably connected to the negative pressure generating chamber body (31); when the piston (32) slides away from the inlet end of the negative pressure generating chamber body (31), the negative pressure generating chamber body (31) generates negative pressure.

5. The zooplankton trapping and monitoring device according to claim 4, characterized in that: The negative pressure generating structure (3) further comprises an elastic member (33), one end of the elastic member (33) being connected to the negative pressure generating chamber body (31), and the other end of the elastic member (33) being connected to the piston (32), the elastic member (33) being used to drive the piston (32) to slide away from the inlet end of the negative pressure generating chamber body (31).

6. The zooplankton trapping and monitoring device according to claim 5, characterized in that: The negative pressure generating structure (3) further comprises a piston rod (34) and an unlocking member (35), wherein a first end of the piston rod (34) is connected to the piston (32), a second end of the piston rod (34) extends out of the negative pressure generating chamber (31), and the second end of the piston rod (34) has a slot (341); When the unlocking member (35) is abutted against the locking groove (341), the piston rod (34) and the piston (32) are locked; when the unlocking member (35) is withdrawn from the locking groove (341), the elastic member (33) drives the piston (32) to slide away from the inlet end of the negative pressure generating chamber (31).

7. The zooplankton trapping and monitoring device according to any one of claims 1 to 6, characterized in that: The bottom of the capture bin body (12) is conical, and the small diameter end of the conical bin body is connected to the screening bin body (21).

8. The zooplankton trapping and monitoring device according to any one of claims 1 to 6, characterized in that: The capture structure (1) further comprises a camera (14) and / or an illumination lamp (15) arranged on the capture chamber (12); the lens of the camera (14) faces the inner side of the capture chamber (12); and the illumination lamp (15) is used to illuminate the inner side of the capture chamber (12); It also includes an environmental monitor (4) arranged on the capture structure (1).

9. A working method of a zooplankton trapping and monitoring device, characterized in that: The steps include: A bait (13) is placed in a capture chamber (12) of a capture structure (1); an elastic member (33) in a negative pressure generating structure (3) is compressed, and a piston rod (34) is locked on an unlocking member (35); Placing the zooplankton trapping and monitoring device in waters of a predetermined depth; recording images of the zooplankton entering the capture chamber (12) via a camera (14) on the capture chamber (12); When the number of zooplankton entering the capture bin (12) reaches a certain amount, or the zooplankton trapping and monitoring device has been arranged for a predetermined time, the unlocking member (35) releases the piston rod (34), and the piston (32) moves under the push of the elastic member (33), thereby generating negative pressure to suck the zooplankton in the capture bin (12) into the screening bin (21); After the piston (32) stops moving, the one-way valve (22) is closed, and the zooplankton is distributed in the corresponding area of ​​the screening chamber (21) under the isolation of the screen (23), thereby completing the capture of the zooplankton.

10. The working method of the zooplankton trapping and monitoring device according to claim 9, characterized in that: When there are multiple sub-screening bins (21), each sub-screening bin (21) is connected to the capturing bin (12), and each negative pressure generating structure (3) is started in sequence after a set time interval.

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