A device for collecting drifting fish eggs

Abstract

This utility model relates to the field of early fish resource collection technology, specifically to a device for collecting drifting fish eggs. It includes a conical filter screen made of silk sieve, with an opening and a connection port at each end. The diameter of the opening is larger than the diameter of the connection port. A seed collection tube is detachably connected to the connection port, and an egg sieve is located at the connection between the seed collection tube and the connection port. Several ring bands are evenly distributed on the filter screen. Multiple sets of annular frames corresponding to the conical contour of the filter screen are detachably connected to both the opening and the filter screen. The annular frames are fixed to the filter screen by the ring bands. Connecting rod assemblies for lateral reinforcement of adjacent annular frames are detachably connected to the filter screen, located between the annular frames. A measuring component for measuring environmental data is located at the opening. This utility model effectively resists water flow impact, prevents the conical net from wrinkling and deforming, ensures smooth fish egg collection, and improves collection efficiency and monitoring accuracy.

Description

Technical Field

[0001] This utility model relates to the field of early fish resource collection technology, specifically to a device for collecting drifting fish eggs. Background Technology

[0002] Drifting fish egg collection devices belong to the field of early fish resource surveys and are an important technical means for river ecological monitoring. Early fish resource surveys are crucial for estimating the size of fish breeding populations and predicting changes in fish population size. Drifting fish eggs are typically laid by open-water spawning fish in rivers. These eggs are non-adhesive and semi-buoyant, drifting downstream with the current after fertilization to develop. In my country's freshwater fish populations, drifting-egg-laying fish, represented by the "four major domestic fish" (black carp, grass carp, silver carp, and bighead carp), account for more than 80% of the total freshwater fish resources, and their resource status has significant ecological and economic value.

[0003] Sample collection equipment includes survey vessels, collection nets, current meters, tilt pans, GPS, lead weights, timing devices, egg and fry sieves, water thermometers, and transparency pans. Traditional tools for collecting drifting fish eggs mainly consist of slender nets and conical nets. For example, the "Early Resource Net Conical Fish Egg and Fry Net" sold by the aquatic ecosystem factory mainly consists of a net opening, a filter section, and a collection tube. During collection, the conical net is suspended behind the survey vessel (away from the oars), and the water flow uses the floating fish eggs to wash them into the filter section, where they are finally collected in the collection tube.

[0004] However, because the cone net filtration section is mainly composed of fine canvas and sieve silk, the materials themselves have poor support. When the cone net is placed in water, the impact of the water flow and the inherent properties of the sieve silk cause insufficient support in the middle of the net, making it prone to wrinkling and deformation. This deformation prevents the collected fish eggs from flowing smoothly into the rear collection tube in a timely manner, and some fish eggs may even be lost due to the backflow of water, reducing the efficiency of fish egg collection and adversely affecting the investigation and monitoring of drifting fish eggs.

[0005] This invention provides a device for collecting drifting fish eggs to solve the above-mentioned problems. Utility Model Content

[0006] To address the aforementioned issues, this invention provides a drifting fish egg collection device that can effectively resist water flow impact, prevent the conical net from wrinkling and deforming, ensure smooth fish egg collection, and improve collection efficiency and monitoring accuracy.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows: A drifting fish egg collection device includes a conical filter screen made of silk sieve. The filter screen has an opening and a connection port at both ends, with the opening diameter larger than the connection port diameter. A seed collection tube is detachably connected to the connection port. An egg sieve is provided at the connection between the seed collection tube and the connection port. Several ring bands are evenly distributed on the filter screen. Several annular skeletons corresponding to the conical outline of the filter screen are detachably connected to the filter screen. The annular skeletons are fixed to the filter screen by the ring bands. A connecting rod assembly for lateral auxiliary reinforcement of adjacent annular skeletons is detachably connected to the filter screen. The connecting rod assembly is located between the annular skeletons. A measuring component for measuring and collecting environmental data is provided at the opening.

[0008] The technical principles of the above solution are as follows: By arranging multiple sets of ring skeletons on the mesh opening and mesh body of the conical filter screen, and using the ring bands evenly arranged on the outside of the filter screen to tighten and fix the ring skeletons, and then adding horizontally arranged connecting rod assemblies between adjacent ring skeletons, a rigid support frame is formed by the ring skeletons and the horizontal connecting rod assemblies.

[0009] The filter screen is shaped and constrained around its circumference by a ring-shaped frame. The connecting rod assembly further connects the frames and limits the local displacement and collapse of the filter screen, effectively compensating for the poor support of the silk material itself. At the same time, the horizontal connecting rod assembly resists the squeezing and pulling effects of water flow impact, structurally preventing wrinkles and deformation in the middle of the filter screen. This allows fish eggs to pass smoothly through the conical filter screen and be screened by the egg and larvae screen before flowing into the detachable larvae collection tube at the rear end, avoiding fish eggs from being retained, flowing back, or lost due to filter screen deformation.

[0010] The above approach has the following beneficial effects: 1. This solution uses the combination of a ring frame and a ring belt to shape and constrain the filter screen in the circumference. Combined with the horizontally arranged connecting rod components to tie adjacent frames, a stable and rigid support structure is formed. This prevents deformation such as wrinkles and bulges in the middle of the filter screen, ensuring that the filter screen always maintains a regular conical shape. This ensures that fish eggs can be smoothly guided into the fry collection tube, reducing fish egg retention, backflow and loss, and improving fish egg collection efficiency.

[0011] 2. This solution features a flexible structural design that facilitates disassembly, maintenance, and portability: both the ring frame and the seed collection tube are detachable, the ring straps can flexibly fix the frame, the connecting rod components are adapted to the frame spacing, and can be folded and stored after disassembly, reducing transportation and storage costs.

[0012] 3. In this solution, the egg sieving screen at the connection port can perform preliminary screening of fish eggs, preventing impurities from entering the seed collection tube, while also facilitating subsequent cleaning and maintenance, thus improving the practicality and service life of the device.

[0013] Furthermore, the ring-shaped frame is provided with several connection holes.

[0014] Beneficial effect: The connecting holes provide connection points for the subsequent installation of components such as lead weights and connecting rod assemblies.

[0015] Furthermore, each connection hole can be detachably connected to a lead weight for counterweight.

[0016] Beneficial effects: The number or weight of lead weights can be flexibly increased or decreased according to the actual working conditions such as water flow speed and water depth in the collection area, so as to achieve flexible adjustment of the immersion depth of the filter screen. This also prevents the filter screen from being washed away by the water flow or from shaking significantly, ensuring the stability of the collection operation and further reducing the loss of fish eggs.

[0017] Furthermore, the connecting rod assembly includes a first connecting rod and a second connecting rod. One end of the first connecting rod is fixed to the annular frame, and the other end of the first connecting rod is hinged to the second connecting rod. The other end of the second connecting rod is fixed to another annular frame.

[0018] Beneficial effects: Based on the horizontally reinforced ring frame structure, the first and second horizontal connecting rods are hinged to facilitate folding and storage, reduce transportation difficulty, and improve portability.

[0019] Furthermore, the hinge joint of the first connecting rod and the second connecting rod is symmetrically provided with locking structures for locking the first connecting rod and the second connecting rod. Each locking structure includes a locking piece and a limiting block corresponding to the locking piece. One end of the locking piece is hinged to the second connecting rod, and the limiting block is fixed to the first connecting rod.

[0020] Beneficial effects: A locking structure is set at the hinge of the first connecting rod and the second connecting rod. Through the cooperation of the locking plate and the limiting block, the hinged connecting rod assembly can be locked and fixed, avoiding the connecting rod from rotating or loosening due to water flow impact, ensuring the stability of the skeleton support structure, further preventing the filter screen from wrinkling and deforming, and ensuring the smooth collection of fish eggs.

[0021] Furthermore, a detachable traction rope is attached to the mesh opening.

[0022] Beneficial effects: The detachable tow rope at the net opening facilitates the use of the survey vessel for towing and movement by the operators, allowing for flexible adjustment of the collection position to adapt to different waters and collection needs. The detachable design also facilitates the replacement and storage of the tow rope, improving operational convenience.

[0023] Furthermore, a pull ring is fixedly connected to the traction rope.

[0024] Beneficial effects: It can also be used with hooks, ropes and other components to fix or drag the device, preventing the traction rope from slipping during the traction process, and improving the safety and convenience of the operation.

[0025] Furthermore, the measuring components include a speedometer and an inclination disk. A crossbar is fixedly connected to the mesh opening along its diameter. The inclination disk is detachably connected to the crossbar. A measuring rod is detachably connected to the mesh opening. The other end of the measuring rod is fixed to the crossbar. The speedometer is detachably connected to the measuring rod.

[0026] Beneficial effects: The tilting disc measures the angle between the net opening and the river cross-section, correcting the actual area of ​​the net opening; the velocimeter measures the water flow velocity in the collection area, providing key data for fish egg collection efficiency analysis and ecological behavior research of drifting fish eggs; the detachable design of the measuring rod facilitates the maintenance, replacement and storage of the velocimeter, improving the practicality of the device.

[0027] Furthermore, a sieve is provided on the side wall of the seed collection tube.

[0028] Beneficial effects: It can facilitate the circulation of water in the seedling collection tube, avoid excessive water accumulation in the collection tube which would lead to excessive water pressure and damage to fish eggs, and at the same time filter out some fine impurities, keep the water quality in the collection tube clean, provide a good temporary storage environment for fish eggs, and reduce fish egg mortality.

[0029] Furthermore, the mesh size of the sieve is smaller than that of the filter screen.

[0030] Beneficial effects: The mesh size of the sieve is smaller than that of the filter screen, which allows for secondary sieving of fish eggs that have been initially filtered by the filter screen, effectively preventing impurities and debris from entering the seed collection tube. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the main body of the drifting fish egg collection device of this utility model; Figure 2 This is a schematic diagram of the main body of the ring-shaped skeleton. Figure 3 This is a cross-sectional view of a ring-shaped skeleton. Figure 4 This is a schematic diagram of the connecting rod assembly; Figure 5 This is an isometric schematic diagram of the seed collection tube; Figure 6 for Figure 1 Enlarged view of part A in the middle.

[0032] The reference numerals in the accompanying drawings of the instruction manual include: 1. Filter screen; 2. Mesh opening; 3. Connection port; 4. Seed collection tube; 5. Egg and seedling sieve; 6. Ring belt; 7. Circular frame; 8. Connection hole; 9. Lead weight; 10. Locking plate; 11. Limiting block; 12. Traction rope; 13. Pull ring; 14. Speed ​​meter; 15. Inclined plate; 16. Crossbar; 17. Measuring rod; 18. Screen; 101. First connecting rod; 102. Second connecting rod. Detailed Implementation

[0033] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The following detailed description illustrates the specific implementation method: Example 1: As shown in the attached document Figure 1 and Figure 5 As shown: A device for collecting drifting fish eggs includes a conical filter screen 1, which is made of silk sieve. The filter screen 1 has a mesh opening 2 and a connecting opening 3 at both ends. The diameter of the mesh opening 2 is larger than the diameter of the connecting opening 3 (the diameter of the mesh opening 2 is preferably 0.5m, the area of ​​the mesh opening 2 is preferably 0.196㎡, and the length of the filter screen 1 is preferably 2m). A seedling collection tube 4 is detachably connected to the connecting opening 3 (the seedling collection tube 4 is cylindrical in shape, the bottom diameter of the seedling collection tube 4 is preferably 12cm, and the height of the seedling collection tube 4 is preferably 20cm). An egg and seedling sieve 5 is provided at the connection between the seedling collection tube 4 and the connecting opening 3. A sieve 18 is provided on the outer wall of the seedling collection tube 4, and the mesh size of the sieve 18 is smaller than the mesh size of the filter screen 1.

[0037] Several ring bands 6 are evenly sewn and fixed on the filter screen 1. Several ring skeletons 7 corresponding to the conical contour of the filter screen 1 are detachably connected to the filter screen 1 (the inner diameter of the ring skeleton 7 decreases from the mesh opening 2 to the connecting opening 3, and the number of ring skeletons 7 can be adjusted according to the actual situation). The ring skeletons 7 are fixed to the filter screen 1 by the ring bands 6. Connecting rod assemblies for lateral auxiliary reinforcement of adjacent ring skeletons 7 are detachably connected to the filter screen 1. The connecting rod assemblies are located between the ring skeletons 7. A measuring component for measuring and collecting environmental data is provided at the mesh opening 2.

[0038] During collection, the main method is to use the outboard motor installed on the survey vessel to drag the filter screen 1 laterally in the water to collect the fish eggs drifting in the water. The survey vessel is preferably 9m long and 3m wide, and is preferably equipped with two 13.2kw conventional diesel engines and a constant force 8.8 outboard motor. The survey vessel serves as a means of transportation and a collection platform.

[0039] The specific implementation process is as follows: During collection, the survey vessel is sailed to the target water body, and then the ring frame 7 is assembled. The ring frame 7 is fixed and tightened with the preset ring belt 6. Then, the connecting rod assembly is fixed between adjacent ring frames 7 in an alternating manner. The seed collection tube 4 is fixed to the connecting port 3. Finally, the filter screen 1 is placed in the water using the hanging hoist (the net opening 2 needs to be against the direction of water flow, and the filter screen 1 should be far away from the survey propeller when the net is lowered. Since the fish eggs are light, when the propeller disturbs the water, it will affect the fish eggs entering the filter screen 1 and reduce the collection efficiency).

[0040] When filter 1 enters the water, it moves synchronously with the hull, collecting fish eggs floating in the water against the current. Due to the support of the annular frame 7, the middle of filter 1 maintains its shape, allowing the fish eggs to pass smoothly through filter 1 and then through the egg sieve 5 into the collection cylinder 4. Simultaneously, because filter 1 moves against the current, it experiences lateral water flow pulling force. To further reinforce the annular frame 7 and maintain the tapered structure of filter 1, lateral connecting rods are connected between the annular frames 7. The collected fish eggs pass through the egg sieve 5 into the collection cylinder 4. Since the side wall of the collection cylinder 4 is equipped with a screen 18, the mesh size of which is smaller than that of filter 1, water can freely pass through the screen 18, while the fish eggs cannot pass through and are collected in the collection cylinder 4. This also prevents external impurities from entering the collection cylinder 4, achieving the purpose of collecting and purifying drifting fish eggs.

[0041] Traditional conical mesh filters typically use silk sieve material for the main body. Because silk sieve is relatively soft and easily deformed, it can only maintain its shape by relying on the opposing current drag force generated by the relative flow velocity between the water and the filter 1 after immersion in water. This design adds a ring-shaped frame 7 and a transverse connecting rod assembly to form a support and fixing structure for the filter 1. This allows the filter 1 to stably maintain its regular conical structure under different relative flow velocities, preventing it from collapsing or deforming.

[0042] Example 2: As shown in the attached document Figure 2 As shown, the difference from Example 1 is that, in order to adjust the depth of filter screen 1 immersed in the water and maintain the stability of the filter screen 1's shape, as... Figure 6 As shown, the ring-shaped frame 7 is provided with several connecting holes 8, and each connecting hole 8 can be detachably connected to a lead fish 9 for counterweight.

[0043] like Figure 4 As shown, the backflow of water will continuously impact the annular frame 7 on the filter screen 1. In order to further reinforce the annular frame 7, the connecting rod assembly includes a first connecting rod 101 and a second connecting rod 102. One end of the first connecting rod 101 is fixed to the annular frame 7, and the other end of the first connecting rod 101 is hinged to the second connecting rod 102. The other end of the second connecting rod 102 is fixed to another adjacent annular frame 7. The hinge of the first connecting rod 101 and the second connecting rod 102 is symmetrically provided with locking structures for locking the first connecting rod 101 and the second connecting rod 102. Each locking structure includes a locking piece 10 and a limiting block 11 corresponding to the locking piece 10. One end of the locking piece 10 is hinged to the second connecting rod 102, and the limiting block 11 is fixed to the first connecting rod 101 (the locking piece 10 is designed with reference to the internal positioning locking piece of MS705. The locking piece 10 has a small hole, and the bottom of the limiting block 11 is provided with threads. The limiting block 11 is fixed to the first connecting rod 101 by the threads).

[0044] The specific implementation process is as follows: Researchers determine the required immersion depth of filter screen 1 in the water based on actual water monitoring and the depth of the fish eggs. Through the pre-set connection holes 8 on the annular frame 7, a corresponding number of lead weights 9 can be disassembled and assembled to adjust the counterweight. When assembling the lead weights 9, in order to ensure the balance of filter screen 1 after immersion in the water, the lead weights 9 need to be suspended symmetrically. By increasing or decreasing the number of lead weights 9, the overall weight of the entire filter screen 1 structure is changed, thereby adjusting the immersion depth of filter screen 1 in the water, achieving precise control of the immersion depth, and meeting the usage requirements under different working conditions.

[0045] After the lead weight 9 is installed, the positions of the first connecting rod 101 and the second connecting rod 102 need to be adjusted and the locking piece 10 needs to be moved to align the locking piece 10 with the first connecting rod 101. Then, the limiting block 11 is locked with the locking piece 10 to lock the first connecting rod 101 and the second connecting rod 102, preventing the first connecting rod 101 and the second connecting rod 102 from moving relative to each other.

[0046] The first connecting rod 101 and the second connecting rod 102 further reinforce the adjacent annular frame 7, making the filter screen 1 more stable in shape during underwater operation. The hinged connection between the first connecting rod 101 and the second connecting rod 102, while providing lateral fixation to the annular frame 7 structure, also improves portability. Hinging the first connecting rod 101 and the second connecting rod 102 facilitates folding and storage, reducing transportation difficulties. Simultaneously, it avoids rigid connection structures, extending the service life of the connecting rod assembly.

[0047] Example 3: As shown in the attached document Figure 1 As shown, the difference from Embodiment 2 is that a traction rope 12 is detachably connected to the mesh opening 2. A pull ring 13 is fixedly connected to the other end of the traction rope 12. The measuring components include a speedometer 14 and an inclination disk 15. The speedometer 14 is preferably an LS26-3A type propeller-type current meter, and the inclination disk 15 is preferably an ACQJ32X30-10S angle measuring instrument. A crossbar 16 is fixedly connected to the mesh opening 2 along its diameter. The inclination disk 15 is detachably connected to the crossbar 16. A measuring rod 17 is detachably connected to the mesh opening 2, with the other end of the measuring rod 17 fixed to the crossbar 16. The speedometer 14 is detachably connected to the measuring rod 17. In addition, to increase the diversity and richness of environmental data collection, the research vessel is also equipped with a hydrological control system, GPS positioning device, thermometer, depth sounder, rangefinder, and transparency disc (the preferred model for the hydrological control system is the YL-9603 smart terminal, the preferred model for the GPS positioning device is the MG858A, the preferred model for the depth sounder is the HD-LITE-single-frequency depth sounder, the preferred model for the rangefinder is the Leica laser telescope, and the preferred model for the transparency disc is the SD20). The output terminals of the velocity meter 14, tilting disc 15, GPS positioning device, and depth sounder are all electrically connected to the input terminal of the hydrological control system. The hydrological control system receives and displays the corresponding data, facilitating researchers to organize and record it.

[0048] The specific implementation process is as follows: First, connect the pull ring 13 to the hanging device, then throw the filter screen 1 into the water. The traction rope 12 pulls the filter screen 1 to move upstream with the survey vessel. During the collection process, the tilting disc 15 measures the angle between the plane of the net opening 2 and the river cross-section to correct the area of ​​the net opening 2. The velocity meter 14 measures the water flow velocity, measuring the average flow velocity of the net opening 2 during the sampling period to calculate the amount of water filtered by the collection net. A conventional mercury thermometer (accuracy 0.1 degrees Celsius) is used to measure the air and water temperatures during the collection process. The transparency disc is used to determine the water transparency of the sampling area, and a distance meter is used to determine the river width and the distance from the shore to the sampling point. The depth sounder accurately obtains the water depth at the sampling point. Finally, the detection data measured by the measurement components are transmitted to the hydrological control system, where they are received, processed, and collected by the intelligent terminal of the hydrological control system.

[0049] The researchers recorded the data measured by the measuring components in the data acquisition record sheet to facilitate future river ecological surveys and statistical analysis.

[0050] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A device for collecting drifting fish eggs, comprising a conical filter (1), characterized in that, The filter screen (1) is made of silk sieve. The filter screen (1) has a mesh opening (2) and a connection opening (3) at both ends. The diameter of the mesh opening (2) is larger than the diameter of the connection opening (3). The connection opening (3) is detachably connected to a seedling collection tube (4). The connection between the seedling collection tube (4) and the connection opening (3) is provided with an egg seedling sieve (5). The filter screen (1) is evenly provided with several ring bands (6). The filter screen (1) is detachably connected with several ring skeletons (7) corresponding to the conical outline of the filter screen (1). The ring skeletons (7) are fixed to the filter screen (1) by the ring bands (6). The filter screen (1) is detachably connected with a connecting rod assembly for lateral auxiliary reinforcement of adjacent ring skeletons (7). The connecting rod assembly is located between the ring skeletons (7). The mesh opening (2) is provided with a measuring component for measuring and collecting environmental data.

2. The drifting fish egg collection device according to claim 1, characterized in that, The ring-shaped skeleton (7) is provided with several connecting holes (8).

3. The drifting fish egg collection device according to claim 2, characterized in that, Each of the connecting holes (8) can be detachably connected to a lead weight (9) for counterweight.

4. The drifting fish egg collection device according to claim 3, characterized in that, The connecting rod assembly includes a first connecting rod (101) and a second connecting rod (102). One end of the first connecting rod (101) is fixed to the annular frame (7), and the other end of the first connecting rod (101) is hinged to the second connecting rod (102). The other end of the second connecting rod (102) is fixed to another annular frame (7).

5. The drifting fish egg collection device according to claim 4, characterized in that, The hinge joints of the first connecting rod (101) and the second connecting rod (102) are symmetrically provided with locking structures for locking the first connecting rod (101) and the second connecting rod (102). Each locking structure includes a locking piece (10) and a limiting block (11) corresponding to the locking piece (10). One end of the locking piece (10) is hinged to the second connecting rod (102), and the limiting block (11) is fixed to the first connecting rod (101).

6. The drifting fish egg collection device according to claim 5, characterized in that, A traction rope (12) can be detachably connected at the mesh opening (2).

7. The drifting fish egg collection device according to claim 6, characterized in that, A pull ring (13) is fixedly connected to the traction rope (12).

8. The drifting fish egg collection device according to claim 7, characterized in that, The measuring components include a speedometer (14) and an inclination plate (15). A crossbar (16) is fixedly connected to the mesh opening (2) along its diameter direction. The inclination plate (15) is detachably connected to the crossbar (16). A measuring rod (17) is detachably connected to the mesh opening (2). The other end of the measuring rod (17) is fixed to the crossbar (16). The speedometer (14) is detachably connected to the measuring rod (17).

9. The drifting fish egg collection device according to claim 8, characterized in that, The side wall of the seed collection tube (4) is equipped with a sieve (18).

10. The drifting fish egg collection device according to claim 9, characterized in that, The mesh size of the sieve (18) is smaller than that of the filter (1).

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