A device for monitoring fish egg and larvae damage during waterway blasting.

Abstract

This invention discloses a device for monitoring fish egg and fry damage during waterway blasting construction in the field of river management. The device includes: a counterweight with a water inlet at the bottom; a fixing part detachably connected to the top of the counterweight, with a fixing component on the fixing part; and a sealing part detachably connected to the top of the fixing part, with an air outlet at the top. The sealing part, fixing part, and sealing part, when installed, form a hollow egg shape. The beneficial effects of this invention are: by setting a counterweight to balance the weight of the device, and by using an egg-shaped structure for the counterweight, fixing part, and sealing part, the device effectively protects the internal eggs and fry. The overall design is similar to a roly-poly toy, effectively preventing the device from tipping over in water and affecting experimental accuracy.

Description

Technical Field

[0001] This invention relates to the field of river management technology, specifically to a device for monitoring fish egg and fry damage during waterway blasting construction. Background Technology

[0002] Blasting to remove reefs is currently the primary construction technique for clearing navigational obstructions from reefs in the mountainous areas of the upper Yangtze River. However, the instantaneous shock waves generated by blasting can impact aquatic life near the blasting point. To reduce the impact of blasting on sensitive habitats and aquatic organisms, non-blasting technologies such as underwater reef breaking using combined impact hammers and drilling, minimally invasive high-frequency crushing, and integrated milling and excavation have gradually made breakthroughs. However, due to their low efficiency, strong vibrations, and high noise levels, they can currently only serve as effective supplements to blasting. The impact of both blasting and mechanical reef clearing techniques on habitats and aquatic organisms deserves serious attention. Due to the lack of active avoidance capabilities, fish eggs and larvae are more susceptible to the shock waves from blasting, thus requiring close monitoring during underwater blasting operations. With the increasing demands for ecological protection and sustainable development, ensuring the effectiveness of blasting while avoiding irreversible damage to drifting fish eggs and larvae is a pressing technical challenge in waterway improvement projects.

[0003] Existing methods for monitoring the damage of blast shock waves to fish eggs and larvae mainly involve fixed-point monitoring using fish traps. However, existing monitoring devices for the impact of shock waves on fish eggs and larvae use a mesh fish trap structure. Due to the strong current in rivers, the eggs and larvae die very quickly after entering the water, causing significant errors in the actual monitoring of the impact of underwater blast shock waves on the survival rate of fish eggs and larvae. Furthermore, the fish traps are relatively lightweight and cannot sink quickly in the current, often floating. Therefore, additional counterweights are required, making the experimental process very cumbersome and inaccurate.

[0004] Therefore, we propose a monitoring device for fish egg and fry damage during waterway blasting construction. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a device for monitoring fish egg and fry damage during waterway blasting operations.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0007] A device for monitoring fish egg and fry damage during waterway blasting includes: a counterweight with a water inlet at the bottom, the counterweight being used to keep the device below the water surface and vertical; a fixing part detachably connected to the top of the counterweight, the fixing part having a fixing component; and a sealing part detachably connected to the top of the fixing part, the sealing part having an air outlet at the top. The sealing part, fixing part, and sealing part are hollow and egg-shaped when installed.

[0008] By adding a counterweight at the bottom to increase the weight of the entire device, it can be directly submerged below the water surface. The counterweight also makes the device stand upright underwater, ensuring that the inlet is at the bottom when the device is placed in the river, allowing water to flow into the device. In use, the sealing part is removed, fish fry and eggs are placed in, the sealing part is reinstalled, and the entire device is placed in the water. The device is secured with fasteners to prevent it from being washed away by the water flow. The single-peak curved surface shape, similar to an egg, ensures that the device is completely filled with water, leaving no air inside that could affect the propagation of shock waves. Compared to existing fish cages, this device better protects the eggs and fry from the influence of river currents.

[0009] Furthermore, the sealing part is made of a soft, deformable material; the use of a soft, deformable material for the sealing part allows it to be folded and stored after the experiment, so that the device can be used for subsequent egg and seedling rearing.

[0010] Further specified, the counterweight is made of zinc-aluminum alloy and has a counterweight block at the bottom, with the water inlet penetrating through the counterweight block.

[0011] Further, the top of the counterweight is provided with a first external thread, and the bottom of the fixing part is provided with a first internal thread that matches the first external thread. The fixing part is fixed to the counterweight by the cooperation of the first external thread and the first internal thread. The connection between the first external thread and the first internal thread can ensure the stability and sealing of the connection between the counterweight and the fixing part.

[0012] Furthermore, the top of the fixing part is provided with a second external thread, and the bottom of the sealing part is provided with a second internal thread that matches the second external thread. The sealing part is fixed to the fixing part by the cooperation of the second external thread and the second internal thread. The connection between the second external thread and the second internal thread can also ensure the stability and sealing of the connection between the fixing part and the sealing part.

[0013] Further specifying, the fastener is a hanging ring; setting the fastener as a hanging ring facilitates connection.

[0014] Further specifying, the sealing part is made of polyvinyl chloride, and the fixing part is made of polycarbonate.

[0015] The beneficial effects of this invention are as follows: by setting a counterweight to balance the weight of the device, the counterweight, fixing part and sealing part are egg-shaped, which can effectively protect the eggs inside. The whole is similar to a roly-poly toy, which can effectively prevent the device from tipping over in water and affecting the experimental accuracy. Attached Figure Description

[0016] Figure 1 This is an exploded view of the present invention from a frontal perspective;

[0017] Figure 2 This is an exploded three-dimensional view of the invention from a top-down perspective;

[0018] Figure 3 This is an exploded schematic diagram of the three-dimensional state from an upward perspective of the present invention;

[0019] Figure 4 This is a microscopic image showing the state of fish fry after underwater impact in an existing setup.

[0020] Figure 5 This is a microscopic image showing the state of fish eggs after underwater impact in an existing setup.

[0021] Figure 6 This is a microscopic image showing the state of fish fry after underwater impact in the device of the present invention.

[0022] Figure 7 This is a microscopic image showing the state of fish eggs after underwater impact in the device of this invention.

[0023] The symbols for each component are as follows:

[0024] Counterweight 1, water inlet 11, first external thread 12, fixing part 2, hanging ring 21, first internal thread 22, second external thread 23, sealing part 3, air outlet 31, second internal thread 32. Detailed Implementation

[0025] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0026] Example:

[0027] like Figures 1-3As shown, a device for monitoring fish egg and fry damage during waterway blasting includes a counterweight 1, a fixing part 2, and a sealing part 3. The counterweight 1 has a water inlet 11 at its bottom, is made of zinc-aluminum alloy, and has a counterweight block at its bottom. The water inlet 11 passes through the counterweight block. The counterweight 1 is used to keep the device below the water surface and vertical. The fixing part 2 is made of polycarbonate. The top of the counterweight 1 has a first external thread 12, and the bottom of the fixing part 2 has a first internal thread 22 that matches the first external thread 12. The fixing part 2 is fixed to the counterweight 1 by the cooperation of the first external thread 12 and the first internal thread 22. The fixing part 2 has a hanging ring 21, and the top of the fixing part 2 has a second external thread. 23. The bottom of the sealing part 3 is provided with a second internal thread 32 that matches the second external thread 23. The sealing part 3 is fixed to the fixing part 2 through the cooperation of the second external thread 23 and the second internal thread 32. The top of the sealing part 3 is provided with an air outlet 31. The sealing part 3 is made of polyvinyl chloride. The sealing part 3, the fixing part 2 and the sealing part 3 are hollow egg-shaped when installed. The inlet 11 and the air outlet 31 are both provided with a filter screen with a pore size of 2mm to prevent the small egg seedlings from escaping. An inlet piston is provided. After the test, the inlet can be closed, the sealing part 3 can be removed, the counterweight part 1 can be separated from the fixing part 2, and the counterweight part 1 can be stuck in the top opening of the fixing part 2 to directly carry out the subsequent culture of the egg seedlings.

[0028] By adding a counterweight 1 at the bottom to increase the weight of the entire device, it can be directly submerged below the water surface. The counterweight 1 also allows the device to act as a self-righting structure, maintaining its upright position below the water surface. This ensures that when the device is submerged in a river, the inlet 11 is at the bottom, allowing water to flow into the device. During use, the sealing part 3 is removed, fish fry and eggs are placed inside, and the sealing part 3 is reinstalled. The entire device is then submerged in water and secured with fasteners to prevent it from being swept away by the current. The egg-like, single-peaked shape ensures the device is completely filled with water, leaving no air inside. The design affects the propagation of shock waves and can better protect the eggs and fry from the influence of river currents compared to existing fish cages. The sealing part 3 is made of a soft and deformable material, which allows it to be folded and stored after the experiment, and the device can be used for subsequent egg and fry rearing. The connection between the counterweight part 1 and the fixing part 2 is ensured by the first external thread 12 and the first internal thread 22. The connection between the fixing part 2 and the sealing part 3 is also ensured by the second external thread 23 and the second internal thread 32. The fixing part is set as a hanging ring 21 for easy connection.

[0029] Comparative Experiment: The device of this invention was compared with a traditional fish cage as a control group. A fixed amount of fish eggs and fry were placed in both devices, and both devices were simultaneously submerged in river water for ten minutes under the impact of the current. Afterward, the devices were removed from the water, and the survival rate of the eggs and fry and the degree of damage to the fry were observed. The results are shown in Table 1 and [Table data missing]. Figures 4-7 As shown:

[0030] Table 1. Egg and larvae survival rates of the device and fish cage of the present invention.

[0031]

Claims

1. A device for monitoring fish egg and fry damage during waterway blasting operations, characterized in that, include: The counterweight (1) has a water inlet (11) at the bottom. The counterweight (1) is used to keep the device below the water surface and keep it vertical and not tilted. The fixing part (2) is detachably connected to the top of the counterweight part (1), and the fixing part (2) is provided with a fixing member; The sealing part (3) is detachably connected to the top of the fixing part (2). The top of the sealing part (3) is provided with an air outlet (31). The sealing part (3), the fixing part (2) and the sealing part (3) are hollow egg-shaped when installed. The sealing part (3) is made of a soft, deformable material; The counterweight (1) is made of zinc-aluminum alloy and has a counterweight block at the bottom. The water inlet (11) is provided through the counterweight block. The sealing part (3) is made of polyvinyl chloride, and the fixing part (2) is made of polycarbonate. The counterweight (1) enables the device to form a roly-poly toy, keeping the device upright below the water surface.

2. The device for monitoring fish egg and fry damage during waterway blasting construction according to claim 1, characterized in that, The counterweight (1) has a first external thread (12) at the top and the fixing part (2) has a first internal thread (22) at the bottom that matches the first external thread (12). The fixing part (2) is fixed to the counterweight (1) by the cooperation of the first external thread (12) and the first internal thread (22).

3. The device for monitoring fish egg and fry damage during waterway blasting construction according to claim 2, characterized in that, The top of the fixing part (2) is provided with a second external thread (23), and the bottom of the sealing part (3) is provided with a second internal thread (32) that matches the second external thread (23). The sealing part (3) is fixed on the fixing part (2) by the cooperation of the second external thread (23) and the second internal thread (32).

4. The device for monitoring fish egg and fry damage during waterway blasting construction according to claim 1, characterized in that, The fastener is a hanging ring (21).

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