A collection device for monitoring fish reproduction

Abstract

The utility model discloses a kind of for monitoring fish breeding situation's collection device, the device includes fixed ring stand, telescopic rod swivel joint, connecting fixed support, foldable ring stand, first net bag, second net bag, the upper end of the fixed ring stand is connected with foldable ring stand by connecting fixed support, wherein, the foldable ring stand is composed of fixed half ring, movable half ring, spring rotating shaft, fixed magnet;The fixed half ring, movable half ring are connected into complete torus by spring rotating shaft, and fixed half ring, movable half ring have fixed magnet inlay in middle;The movable half ring is rotated buckle in the upper end of fixed half ring with spring rotating shaft as core, and it is realized foldable ring stand's closure and opening by being adsorbed fixed with fixed magnet. It improves the structure of conventional hand copy net, can synchronous collection fish fry and juvenile fish, reduce sampling error, simultaneously, can improve the convenience of operating hand copy net, and can improve the accuracy of monitoring.

Description

Technical Field

[0001] This utility model belongs to the field of fish reproduction monitoring technology, and in particular relates to a data collection device for monitoring fish reproduction. Background Technology

[0002] Fish, as an important component of aquatic ecosystems, play a crucial role in maintaining ecological balance and reflecting the quality of aquatic environments. Monitoring fish reproduction, especially the growth and development of larvae and juveniles, is of great significance for understanding fish population dynamics, assessing ecological health, and formulating scientifically sound ecological protection measures.

[0003] Currently, surveys of early-stage fish resources along riverbanks mainly rely on hand nets. The working mechanism involves dragging the net through the water, causing juveniles and young fish to fall passively into the bottom of the net, and then sorting samples from the mixed filter media after they are removed from the water. However, this conventional tool has revealed significant shortcomings in practical applications.

[0004] First, there is a significant size difference between larvae and juveniles in the water, and the more active later-stage larvae and juveniles often escape due to the mesh size of the nets. If large mesh sizes are used, smaller early-stage larvae will be missed. Although there are double-layer net designs (small mesh inside large mesh) to attempt to achieve graded collection, the difficulty in separating the two layers of nets makes sampling complicated, which not only slows down the sampling speed but also introduces additional errors and reduces the accuracy of monitoring.

[0005] Secondly, during the collection process, juvenile fish are often mixed with debris and piled up, making subsequent sample sorting time-consuming and laborious. Furthermore, improper operation can easily cause damage or omission of fish, further affecting the accuracy and reliability of the monitoring data.

[0006] In view of the aforementioned defects and shortcomings of hand-held nets in collecting fry and juvenile fish, there is an urgent need for an improved collection device that can simultaneously collect fry and juvenile fish of different body lengths, reduce sampling errors, improve operational convenience, and effectively avoid the accumulation of fry and debris, thereby improving the accuracy and reliability of monitoring and better meeting the needs of fish reproduction monitoring.

[0007] This utility model is a research and development achievement of the China Three Gorges Corporation project "Aquatic Ecological Monitoring of the Lower Jinsha River Basin (2019-2024)" (JG / 19017B). The Jinsha River is rich in fish species, which are an important component of the Jinsha River ecosystem. Their presence and reproduction directly reflect the ecological quality of the water body. Monitoring fish reproduction requires monitoring the growth and development of fry and juveniles, necessitating collection tools for capturing them. In the field, collection tools must be convenient to use, easy to make, and easy to carry. The collection tool of this utility model is a second-generation collection tool improved through continuous field exploration. Utility Model Content

[0008] To address the shortcomings and deficiencies of existing technologies, the purpose of this utility model is to provide a simple, rationally designed, and easy-to-use collection device for monitoring fish reproduction. It improves upon the structure of traditional hand nets, enabling simultaneous collection of fry and juvenile fish, reducing sampling errors, and simultaneously enhancing the ease of operation and accuracy of monitoring.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows: it includes a fixed ring frame, a telescopic rod screw joint, a connecting fixed bracket, a foldable ring frame, a first net bag, and a second net bag; the foldable ring frame is connected to the top of the fixed ring frame via the fixed bracket, the first net bag is connected to the fixed ring frame, and the second net bag is connected to the foldable ring frame. The second net bag is located inside the first net bag, and the mesh size of the second net bag is larger than that of the first net bag. The foldable ring frame consists of a fixed half-ring, a movable half-ring, a spring rotating shaft, and a fixed magnet; the fixed half-ring and the movable half-ring are connected to form a complete ring via the spring rotating shaft, and a fixed magnet is embedded in the middle of the fixed half-ring and the movable half-ring; the movable half-ring is rotated and fastened to the upper end of the fixed half-ring with the spring rotating shaft as the axis, and is attracted and fixed by the fixed magnet to realize the closing and opening of the foldable ring frame.

[0010] Preferably, the foldable ring frame has the same diameter and specifications as the fixed ring frame.

[0011] Preferably, the connecting and fixing bracket is an "8"-shaped buckle structure with an opening at the lower end.

[0012] Preferably, the foldable ring frame is replaced with an inner snap-fit ​​spring bracket, which fits inside the fixed ring frame.

[0013] Preferably, the inner spring bracket consists of a left spring and a right spring; the top ends of the left and right springs are connected to the fixed ring frame via a connecting shaft, and the tail ends of the left and right springs are connected to the top end of an operating lever, which is movably inserted into the hollow handle rod.

[0014] Preferably, under the action of the operating lever pulling backward, the left and right springs are pulled backward into a straight structure to close the inner spring bracket.

[0015] The beneficial effects of this utility model after adopting the above structure are as follows: 1. The device has a simple structure and can collect larvae and juveniles simultaneously during survey and monitoring operations, which not only improves collection efficiency but also reduces sampling errors and improves monitoring accuracy.

[0016] 2. The device's built-in large-mesh net can intercept garbage, preventing juvenile fish from mixing with garbage, improving the sorting efficiency of juvenile fish, and avoiding damage to juvenile fish during the sorting process.

[0017] 3. The large mesh count net bag of this device adopts a movable ring frame structure, which can realize the folding and deformation of the expanded net frame, improve the convenience of operation, and avoid the drawbacks of the troublesome disassembly of traditional methods. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, this utility model will be described in detail below with reference to the specific implementation and accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the folded state of this utility model; Figure 3 This is a schematic diagram of the foldable ring frame 4 structure of this utility model; Figure 4 This is a schematic diagram of the connecting and fixing bracket 3 of this utility model; Figure 5 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the folded state of Embodiment 2 of this utility model; Explanation of reference numerals in the attached drawings: 1. Fixed ring frame; 2. Telescopic rod screw joint; 3. Connecting fixed bracket; 4. Foldable ring frame; 41. Fixed half ring; 42. Movable half ring; 43. Spring rotation shaft; 44. Fixed magnet; 5. First net bag; 6. Second net bag; 8. Inner snap spring bracket; 81. Left spring; 82. Right spring; 9. Connecting shaft; 10. Operating lever; 21. Hollow handle rod. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0021] Example 1 See Figures 1-4 As shown, this specific embodiment adopts the following technical solution: it includes a fixed ring frame 1, a telescopic rod screw joint 2, a connecting fixed bracket 3, a foldable ring frame 4, a first net bag 5, and a second net bag 6. The foldable ring frame 4 is connected to the top of the fixed ring frame 1 via the fixed bracket 3. The first net bag 5 is connected to the fixed ring frame 1, and the second net bag 6 is connected to the foldable ring frame 4. The second net bag 6 is located inside the first net bag 5. The mesh size of the second net bag 6 is larger than that of the first net bag 5. The second net bag 6 can intercept debris, preventing fry and debris from accumulating together, reducing the difficulty of subsequent sample handling, and minimizing the possibility of fry being damaged or missed.

[0022] The foldable ring frame 4 consists of a fixed half-ring 41, a movable half-ring 42, a spring rotating shaft 43, and a fixed magnet 44. The fixed half-ring 41 and the movable half-ring 42 are connected by the spring rotating shaft 43 to form a complete ring, and the fixed magnet 44 is embedded in the middle of the fixed half-ring 41 and the movable half-ring 42. The movable half-ring 42 is rotatably fastened to the upper end of the fixed half-ring 41 with the spring rotating shaft 43 as its axis, and is attracted and fixed by the fixed magnet 44, thus achieving the closing and opening of the foldable ring frame 4. The foldable ring frame 4 can be folded to reduce its size and can be placed inside the fixed ring frame 1 for easy carrying.

[0023] The foldable ring frame 4 has the same diameter and specifications as the fixed ring frame 1; the connecting and fixing bracket 3 is an "8"-shaped buckle structure with an open bottom. The connecting and fixing bracket 3 has a simple structure, is easy to use, and is inexpensive.

[0024] Example 2 See Figure 5 , Figure 6As shown, the difference between this specific embodiment and Specific Embodiment 1 is that the foldable ring frame 4 is replaced with an inner snap-fit ​​spring bracket 8, which fits inside the fixed ring frame 1. The inner snap-fit ​​spring bracket 8 consists of a left spring 81 and a right spring 82, the top ends of which are connected to the fixed ring frame 1 via a connecting shaft 9. The tail ends of the left spring 81 and right spring 82 are connected to the top end of an operating lever 10, which is movably inserted into the hollow handle rod 21. When the operating lever 10 is pulled backward by hand, the left spring 81 and right spring 82 are pulled backward into a straight line, causing the inner snap-fit ​​spring bracket 8 to close and exposing the fixed ring frame 1. Similarly, the foldable ring frame 4 can be easily folded and carried.

[0025] Furthermore, the cross-sections of the left spring 81 and the right spring 82 are both semi-circular arc structures, which keep them tightly fitted to the inside of the fixing ring frame 1.

Claims

1. A collection device for monitoring fish reproduction, characterized in that: It comprises a fixed ring frame, a telescopic rod screw connector, a connecting fixed bracket, a foldable ring frame, a first net bag, and a second net bag. The foldable ring frame is connected to the top of the fixed ring frame via the fixed bracket. The first net bag is connected to the fixed ring frame, and the second net bag is connected to the foldable ring frame. The second net bag is located inside the first net bag, and the mesh size of the second net bag is larger than that of the first net bag. The foldable ring frame consists of a fixed half-ring, a movable half-ring, a spring rotating shaft, and a fixed magnet. The fixed half-ring and the movable half-ring are connected to form a complete ring via the spring rotating shaft, and a fixed magnet is embedded in the middle of the fixed half-ring and the movable half-ring. The movable half-ring is rotatably fastened to the upper end of the fixed half-ring with the spring rotating shaft as its axis, and is attracted and fixed by the fixed magnet to achieve the closing and opening of the foldable ring frame.

2. The data collection device for monitoring fish reproduction according to claim 1, characterized in that: The foldable ring frame has the same diameter and specifications as the fixed ring frame.

3. The collection device for monitoring fish reproduction according to claim 1, characterized in that: The connecting and fixing bracket is an "8"-shaped buckle structure with an opening at the lower end.

4. The collection device for monitoring fish reproduction according to claim 1, characterized in that: The foldable ring frame is replaced with an inner snap-fit ​​spring bracket, which fits inside the fixed ring frame.

5. The collection device for monitoring fish reproduction according to claim 4, characterized in that: The inner spring bracket consists of a left spring and a right spring; the top ends of the left and right springs are connected to the fixed ring frame via a connecting shaft, and the tail ends of the left and right springs are connected to the top end of the operating lever, which is movably inserted into the hollow handle rod.

6. The collection device for monitoring fish reproduction according to claim 5, characterized in that: Under the action of the operating lever pulling backward, the left and right springs are pulled backward into a straight line structure, so that the inner spring bracket is closed.

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