Bionic egg protecting device for artificial fish reef of large yellow croaker

Abstract

The invention discloses a large yellow croaker artificial fish reef bionic egg protection device, and belongs to the technical field of aquaculture and fishery resource proliferation, the large yellow croaker artificial fish reef bionic egg protection device comprises a first cover body, at least one protection ring and a first bottom plate which are sequentially arranged from top to bottom; the first cover body, the protective ring and the first bottom plate are connected in a penetrating mode through fasteners and nuts, a second bottom plate is arranged below the first bottom plate at intervals, the first bottom plate and the second bottom plate are fixedly connected through a plurality of connecting rods, a connecting ring body is arranged between every two adjacent connecting rods, and an attachment part used for attachment of large yellow croaker eggs is arranged on the second bottom plate. The bionic flexible attachment carrier is arranged, so that the probability that the fish eggs are mechanically damaged is reduced, the egg attachment rate is increased, water flow exchange of the hatching environment can be ensured, and the phenomenon that still water dead angles are easily formed in a fish egg gathering area is avoided.

Description

Technical Field

[0001] This invention relates to the field of aquaculture and fishery resource enhancement technology, specifically to a biomimetic artificial reef device for protecting eggs of large yellow croaker. Background Technology

[0002] Large yellow croaker is an economically important marine fish species in China, and also a species used for stock enhancement and resource conservation in marine ranching. The eggs laid by the large yellow croaker are buoyant and, in the natural state, require attachment to rocky reefs, seaweed beds, gorgonian corals, or other carriers to complete embryonic development. They have specific requirements regarding the substrate, water flow environment, dissolved oxygen levels, and protection from predators. Currently, in the natural reproduction and artificial stock enhancement processes of large yellow croaker, the harsh incubation microenvironment and low egg survival rate have already affected resource recovery. Existing artificial reefs are mostly solid concrete blocks, steel frames, and box-like structures, making the eggs susceptible to ocean currents and wave impacts, resulting in large-scale detachment, drifting, and sedimentation, preventing normal hatching and leading to insufficient utilization of natural spawning grounds. In contrast, natural spawning grounds are mainly composed of flexible, swaying carriers such as seaweed and corals, which can buffer against water flow shear forces. Existing artificial reefs are all rigid structures, with fish eggs in direct contact with the hard surface. Under the reciprocating action of water flow, problems such as egg membrane damage and embryonic necrosis are easily caused. Therefore, there is a need for an artificial reef suitable for hatching large yellow croaker. Currently, there are related technologies providing egg-protecting reefs, such as the existing patent CH718758B1. This patent provides an artificial reef and its use for raising fish eggs. The reef includes a box with an open top. A fixed partition is attached to one side wall of the box at a certain distance from the top edge of the same side wall. A large amount of fish egg-binding medium is arranged at the bottom of the box and on the surface of the fixed partition, with the partition located away from the floor. This technology can significantly reduce local flow velocity, thereby creating a flow velocity gradient within the reef. However, existing egg-protecting reefs still have room for improvement in areas such as biomimetic hatching. Summary of the Invention

[0003] The purpose of this invention is to provide a biomimetic egg-protecting device for large yellow croaker artificial reefs. By constructing an algae-derived flexible adhesive substrate, the rigid interface contact damage effect is weakened, improving the implantation and retention efficiency and interface affinity of fish eggs. The egg-protecting device can enhance the water replacement efficiency inside the breeding chamber and inhibit the occurrence of stagnant and low-oxygen zones inside dense clusters of fish eggs, thereby reconstructing the hydrodynamic conditions of the near-bottom microenvironment and achieving simultaneous improvement in environmental stability and survival rate during the development period of fish eggs.

[0004] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: a biomimetic egg-protecting device for artificial reefs of large yellow croaker, comprising a first cover, at least one protective ring, and a first base plate arranged sequentially from top to bottom. The first cover, the protective ring, and the first base plate are connected through fasteners and nuts. A second base plate is provided at intervals below the first base plate. The first base plate and the second base plate are fixedly connected by several connecting rods. A connecting ring is provided between adjacent connecting rods. An attachment member for attaching large yellow croaker eggs is provided on the second base plate.

[0005] This invention employs a first cover, a protective ring, a first base plate, and nuts that are locked together to form an overall frame structure. A second base plate is then spaced below the first base plate, and the two are fixedly connected by multiple connecting rods. Connecting rings are arranged between adjacent connecting rods, forming a double-layered base plate and a hollow support structure. This ensures both overall rigidity and efficient water exchange, eliminating the stagnant water dead zones found in traditional artificial reefs. This allows the area around the fish eggs to continuously receive fresh water flow and sufficient dissolved oxygen, while reducing sediment deposition and preventing the eggs from being buried and suffocated. Furthermore, the attachment components on the second base plate provide a stable and flexible biomimetic attachment interface for the floating eggs of the large yellow croaker, avoiding mechanical damage caused by direct contact between the eggs and rigid substrates, improving the attachment rate and stability of the eggs, and reducing loss due to ocean currents and drift. Finally, the protective ring forms a semi-enclosed egg-protecting space, which, in conjunction with the shielding effect of the first cover, prevents large planktonic debris and predators from invading the egg-protecting area, reducing the risk of predation on the eggs, while not affecting normal water flow or the entry of plankton.

[0006] It should be noted that the modular combination structure composed of the first cover, protective ring, first base plate and second base plate of the present invention can flexibly adjust the assembly height and combination form according to water depth, flow velocity and spawning scale.

[0007] According to one embodiment of the present invention, the protective ring includes an annular protective body, the protective body having a plurality of through holes, and the protective body having a first access channel and a second access channel communicating with the internal space around it. A monitoring device is installed in either the first or second entrance / exit passage.

[0008] The ring-shaped protective body provides a surrounding enclosure, and the multiple protective rings are connected to ensure the overall frame rigidity and wave resistance. At the same time, the first and second inlet / outlet channels around the protective body form a multi-directional and balanced water convection channel, which allows for smooth exchange of water flow inside and outside the device. This continuously replenishes dissolved oxygen for the large yellow croaker eggs attached to the attachment and removes metabolic waste. Structurally, it eliminates dead zones in still water, avoiding local hypoxia, water quality deterioration, and sediment accumulation. Furthermore, a monitor is installed in the first or second inlet / outlet channel to obtain parameters of the incubation microenvironment in real time in situ.

[0009] According to one embodiment of the present invention, a shrink tube is provided on the upper part of the first cover, wherein the diameter of the upper end of the shrink tube is smaller than the diameter of the lower end. The shrink tube is a rotating structure, and a through hole is provided inside the first cover. Both the first cover and the first base plate are provided with through holes for fasteners to pass through.

[0010] The rotating structure, connected to the through hole of the first cover, guides the large yellow croaker into the egg-protecting area. At the same time, it stabilizes the water flow entering the device, preventing the strong upward and downward flow from impacting the attachment and causing the fish eggs to fall off. This effectively improves the stability of the internal flow field. The through structure of the contraction tube can maintain the pressure balance inside and outside the device and ensure the efficiency of water exchange. In addition, both the first cover and the first base plate are provided with through holes for fasteners to pass through and, together with nuts, firmly lock the first cover, protective ring, and first base plate into one unit.

[0011] According to one embodiment of the present invention, the attachment is a flexible strip-shaped spiral bending structure, and the surface of the attachment is provided with second openings spaced apart, and a plurality of first openings with a diameter smaller than the second openings are provided around the second openings.

[0012] The attachment, which adopts a flexible, spirally bent structure, can swing naturally with the water flow, buffering the impact of ocean currents and preventing direct collision between fish eggs and rigid substrates, thus avoiding damage to the egg membrane and death of the embryo. The spirally bent shape of the attachment makes it more difficult for the fish eggs to fall off, thereby improving the attachment stability. Furthermore, the surface of the attachment is provided with second openings at intervals, and several first openings with smaller diameters are arranged around them to ensure that the water flows evenly through, eliminating local dead zones and oxygen-deficient areas, continuously supplying dissolved oxygen and removing embryonic metabolic waste.

[0013] According to one embodiment of the present invention, the second base plate is an annular rotating body structure with an opening in its middle. A counterweight assembly is installed in the opening. The counterweight assembly includes a counterweight rod, at least one counterweight disc, and limiting discs. The counterweight disc is sleeved on the counterweight rod, and the limiting discs are located at both ends of the counterweight rod to prevent the counterweight disc from falling off. The present invention uses an annular rotating body structure for the second base plate, with a reserved opening in the middle for assembling the counterweight assembly, so that the overall center of gravity is lowered and centered, thereby improving the stability and anti-overturning ability of the device on the seabed and avoiding displacement, tipping, or overturning caused by water flow impact. Furthermore, the counterweight assembly consists of a counterweight rod, a counterweight disc that can be increased or decreased in number, and limiting discs at both ends, and the total amount of counterweight can be adjusted according to the water depth, seabed type, and tidal current intensity.

[0014] According to one embodiment of the present invention, the counterweight rod is connected to the connecting ring body via a first rope. Connecting the counterweight rod to the connecting ring body via the first rope ensures that the counterweight assembly remains centered throughout the entire process of device deployment, sinking, and bottoming, ensuring that the device lands quickly and accurately. In addition, the flexible connection reduces the rigid disturbance of the device body caused by the swing of the counterweight assembly, and reduces the transmission of vibration to the attachment parts, thus reducing the risk of fish eggs falling off.

[0015] According to one embodiment of the present invention, a plug is provided at the end of the counterweight rod to prevent the counterweight rod from detaching from the counterweight disc. The lateral limiting effect of the plug locks the axial position of the counterweight disc structurally, forming a double constraint with the limiting discs at both ends of the counterweight rod, thus preventing the counterweight disc from shifting or falling off along the counterweight rod under the influence of long-term ocean currents or other forces.

[0016] According to one embodiment of the present invention, the connecting rings are spaced apart along the height of the connecting rod, with the vertical spacing between the connecting rings being equal or unequal. The unequal spacing of the connecting rings allows for adjustment of the support density based on ocean current velocity, water depth, and stress characteristics. In high-stress areas, the rings are densely arranged to enhance structural strength, while in low-stress areas they are reasonably sparse to optimize water exchange. This achieves a balance between structural stability and water permeability. Furthermore, the spaced-out connecting rings can evenly distribute the counterweight tension and ocean current impact force transmitted by the first rope to all connecting rods, avoiding localized stress concentration that could cause fatigue damage to the rods.

[0017] According to one embodiment of the present invention, an aeration element is also installed in the opening in the middle of the second base plate, and an aeration baffle is provided above the aeration element. The aeration baffle and the aeration element are connected by a connecting column and an air outlet gap is left.

[0018] An aeration device is installed in the opening in the middle of the second bottom plate. The dissolved oxygen in the egg protection area is continuously replenished through aeration, which improves the water environment for embryonic development and eliminates the problems of hypoxia and accumulation of metabolic waste caused by dense clustering of fish eggs. An aeration baffle is fixed above the aeration device by a connecting column, and an air outlet gap is reserved between the two. This can convert the vertically upward direct airflow into horizontally diffused uniform microbubbles, avoiding the direct impact of high-speed airflow on the attached fish eggs, and preventing the fish eggs from being washed off, the egg membrane from being damaged, or the embryonic development from being abnormal.

[0019] According to one embodiment of the present invention, the attachment member is connected to the second base plate by adhesive or plug-in method. The attachment member can flexibly swing with the water flow. Under the action of ocean current, the attachment member can sway slightly to buffer the impact force of the water flow and the transmission of vibration, so as to avoid repeated friction between the fish eggs and the hard base, which would cause damage to the egg membrane and necrosis of the embryo. The flexible swing state can keep the attachment member at a suitable tilt angle, improve the probability and stability of fish egg attachment, and reduce the phenomenon of falling off, drifting and accumulation. In addition, the swing process can also cause slight disturbance to the surrounding water, promoting local water exchange. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the first scheme of the artificial reef biomimetic egg-protecting device for large yellow croaker of the present invention; Figure 2 This is a schematic diagram of the connection scheme between the counterweight component and the connecting ring body of the present invention; Figure 3 This is a schematic diagram of the connection scheme between the second base plate and the attachment member of the present invention; Figure 4 This is a schematic diagram of the counterweight component scheme of the present invention; Figure 5 This is a schematic diagram of the connection scheme between the third base plate and the attachment member of the present invention; Figure 6 This is a schematic diagram of the attachment scheme of the present invention; Figure 7 This is a schematic diagram of the protective ring scheme of the present invention; Figure 8 This is a schematic diagram of the second scheme of the artificial reef biomimetic egg-protecting device for large yellow croaker of the present invention; Figure 9 This is a schematic diagram of the third scheme of the artificial reef biomimetic egg-protecting device for large yellow croaker of the present invention; Figure 10 This is a schematic diagram of the connection scheme between the aeration element and the connecting ring of the present invention; Figure 11 This is a schematic diagram of the aeration element scheme of the present invention.

[0022] Explanation of reference numerals in the attached drawings: 10. First cover; 11. Contraction tube; 12. Nut; 13. First base plate; 14. Second base plate; 15. Connecting ring; 16. Connecting rod; 17. Through hole; 18. Third base plate; 20. Protective ring; 21. Protective body; 22. First inlet / outlet channel; 23. Monitor; 24. Second inlet / outlet channel; 30. Attachment; 31. First opening; 32. Second opening; 40. Counterweight assembly; 41. First rope; 42. Counterweight rod; 43. Counterweight disc; 44. Limiting disc; 50. Shell; 51. Reinforcing strip; 60. Protective cover; 70. Aeration component; 71. Aeration baffle; 72. Connecting column. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments. Example 1

[0025] As shown in the attached figure Figure 1 As shown, this invention discloses a biomimetic egg-protecting device for artificial reefs of large yellow croaker. The main body of the device includes protective rings 20 stacked sequentially. Each protective ring 20 includes a protective body 21 with a rotating structure. The protective body 21 is specifically an annular structure with corresponding through holes. Multiple protective rings 20 can be stacked by fasteners passing through the through holes and connecting structural components such as nuts 12. A first cover 10 is provided above the stacked protective rings 20, and a first base plate 13 is provided at the bottom of the stacked protective rings 20. Both the first base plate 13 and the first cover 10 have through holes 17 corresponding to the through holes. The corresponding number of protective rings 20 are stacked according to the height requirements of the artificial reef in the target water area. Fasteners such as bolts are used to sequentially pass through the first cover 10, the protective rings 20, and the first base plate 13 to form the main structure of the artificial reef.

[0026] The first base plate 13 is an annular plate with a through hole in its middle that communicates with the inner space of the stacked protective ring 20.

[0027] In this example, see Appendix Figure 1 -Appendix Figure 2 As shown, the bottom of the first bottom plate 13 has a second bottom plate 14 spaced apart from it. The second bottom plate 14 is a ring-shaped rotating structure. The space between the first bottom plate 13 and the second bottom plate 14 has a vertically arranged connecting rod 16. The upper end of the connecting rod 16 is connected to the bottom of the first bottom plate 13, and the bottom of the connecting rod 16 is connected to the surface of the second bottom plate 14. The space between adjacent connecting rods 16 forms a channel for organisms, sediment and impurities at the bottom of the water body to pass through. A connecting ring 15 is provided between adjacent connecting rods 16. The connecting ring 15 can be made of a flexible material to avoid damage to organisms, or it can be made of a rigid material, depending on the aquatic ecology and the biological conditions.

[0028] A first cover 10, a protective ring 20, a first base plate 13, and nuts 12 are used to form an integral frame structure. A second base plate 14 is then spaced below the first base plate 13. The two are fixedly connected by multiple connecting rods 16, with connecting rings 15 arranged between adjacent connecting rods 16, forming a double-layered base plate and a hollow support structure. This ensures both overall rigidity and efficient water exchange, thus eliminating the stagnant water dead zones inside traditional artificial reefs. This allows the fish eggs to continuously receive fresh water and sufficient dissolved oxygen, while reducing sediment deposition and preventing the fish eggs from being destroyed. Furthermore, the attachment element 30 provided on the second base plate 14 can provide a stable and flexible biomimetic attachment interface for the floating eggs of large yellow croaker, avoiding mechanical damage caused by direct contact between the eggs and the rigid substrate, improving the attachment rate and stability of the eggs, and reducing the loss caused by ocean current scouring and drift. In addition, the protective ring 20 surrounds and forms a semi-enclosed egg protection space, which, together with the shielding effect of the first cover 10, blocks large planktonic debris and predatory organisms from invading the egg protection area, reducing the risk of the eggs being preyed upon, while not affecting normal water circulation and the entry of plankton.

[0029] In this embodiment, a contraction tube 11 is located above the first cover 10. The contraction tube 11 is a rotating structure with through holes at both ends. The diameters of the through holes are equal or unequal at both ends. The through holes penetrate the bottom of the first cover 10, allowing organisms and objects to enter and exit the internal space of the main structure of the reef, formed by the first cover 10, the protective ring 20, and the first base plate 13, through the contraction tube 11. This allows them to enter and exit the space inside the protective ring 20. The rotating structure, connected to the through holes in the first cover 10, guides the large yellow croaker into the egg-protecting area. It also stabilizes the water flow entering the device, preventing strong, vertical currents from impacting the attachment member 30 and causing the eggs to fall off. This effectively improves the stability of the internal flow field. The through structure of the contraction tube 11 maintains pressure balance inside and outside the device and ensures efficient water exchange.

[0030] This embodiment describes the structural form of the protective ring 20 in detail. (See attached image) Figure 7 As shown, the aforementioned protective ring 20 includes a protective body 21, which is a circular ring structure. The protective body 21 has at least two through holes spaced apart. In the case of a small number of through holes, the through holes should not be too close together or located on the same side of the protective body 21, as this can easily reduce the stability of the protective ring 20 stacked on the side without through holes. The protective body 21 has a first access channel 22 and a second access channel 24 communicating with its inner space. The arrangement of the first access channel 22 and the second access channel 24 can form a... Figure 7The diagram shows an inlet / outlet channel 24 with first inlet / outlet channels 22 spaced apart on both sides. Other layouts are also possible, such as an inlet / outlet channel 24 with first inlet / outlet channels 22 spaced apart on one side. In this embodiment, the cross-sectional shape of the first inlet / outlet channel 22 and the second inlet / outlet channel 24 is not limited to circular, polygonal, or elliptical shapes. A ring-shaped protective body 21 provides a surrounding enclosure, and the multiple protective rings 20 are connected to ensure the overall frame rigidity and wave resistance. Simultaneously, the first inlet / outlet channel 22 and the second inlet / outlet channel 24, encircled by the protective body 21, form a multi-directional and balanced water convection channel, allowing for smooth water exchange inside and outside the device. This continuously replenishes dissolved oxygen for the large yellow croaker eggs on the attachment 30 and removes metabolic waste, structurally eliminating still water dead zones and preventing localized oxygen deficiency, water quality deterioration, and sediment accumulation.

[0031] Furthermore, a monitor 23 can be installed within the first inlet / outlet channel 22 or the second inlet / outlet channel 24. This monitor 23 includes, but is not limited to, sensors such as water temperature sensors, oxygen sensors, and pH sensors used to monitor the water quality environment during fish egg hatching. The required monitor 23 can be selectively installed on a single protective ring 20, or it can be selectively installed layer by layer on multiple stacked protective rings 20. The monitor 23 installed within the first inlet / outlet channel 22 or the second inlet / outlet channel 24 is used to acquire parameters of the hatching microenvironment in real time and in situ. Example 2

[0032] This embodiment is based on the embodiment 1 and discloses the following solution: See attached Figure 2 Appendix Figure 3 As shown, multiple attachment members 30 are arranged on the second base plate 14, as shown in the figure. Figure 6 The attachment 30 is a strip-shaped spiral bending structure. The bottom of the attachment 30 is connected to the second base plate 14 by adhesive bonding or insertion. The attachment 30 is vertically positioned and has a certain degree of flexibility. Second openings 32 are arranged at intervals on the surface of the attachment 30, and first openings 31 with smaller diameters are arranged around each second opening 32. The flexible strip-shaped spiral bending structure of the attachment 30 allows it to sway naturally with the water flow, buffering the impact of ocean currents and preventing direct collisions between fish eggs and the rigid substrate, which could cause damage to the egg membrane and embryonic death. The spiral bending shape of the attachment 30 makes it more difficult for fish eggs to detach, thus improving the attachment stability. Furthermore, the second openings 32 are spaced apart on the surface of the attachment 30, and several first openings 31 with smaller diameters are arranged around them, ensuring that water flows evenly through, eliminating localized stagnant water dead zones and oxygen-deficient areas, continuously supplying dissolved oxygen, and removing embryonic metabolic waste. Example 3

[0033] This embodiment is based on the embodiment 1 and discloses the following solution: See attached Figure 5 As shown, in this embodiment, the bottom of the connecting rod 16 is a third base plate 18, that is, the third base plate 18 replaces the second base plate 14. The second base plate 14 has an opening in the middle, which can be used to accommodate or connect the counterweight assembly 40. The connection method between the counterweight assembly 40 and the second base plate 14 is shown in [the diagram]. Figure 2 As shown, in this embodiment, the third base plate 18 at the bottom of the connecting rod 16 is a circular plate without an opening in the middle. The third base plate 18 is preferably a flexible base plate, which is beneficial to improving the adhesion of the entire device to the mud, sand, and stones at the bottom of the water after it is placed in the water. Multiple attachment members 30 are arranged on the third base plate 18, as shown in the figure. Figure 6 The structure is expressed in the middle. The attachment 30 is a strip-shaped spiral bending structure. The bottom of the attachment 30 is connected to the second base plate 14 by adhesive, plugging or other methods. The attachment 30 is set in a vertical state and has a certain degree of flexibility. The surface of the attachment 30 is provided with second openings 32 at intervals. The periphery of the second openings 32 is provided with first openings 31 with a diameter smaller than the second openings 32. Example 4

[0034] This embodiment is based on the embodiment 1 and discloses the following solution: like Figure 2 As shown, the second base plate 14 has an opening in the middle, which can be used to accommodate or connect the counterweight assembly 40. Figure 4 As shown, the counterweight assembly 40 includes counterweight discs 43 stacked sequentially. The edges of the counterweight discs 43 are spaced apart. Multiple counterweight discs 43 are stacked, and the specific number is selected according to the counterweight requirements. Each counterweight disc 43 has a mounting through hole in its center, into which a counterweight rod 42 is inserted. The counterweight rod 42 has limiting circular plates 44 at both ends with a diameter larger than the mounting through hole. Inserted rods are located on the sides of the ends of the counterweight rods 42 to prevent them from detaching from the counterweight discs 43. Specifically, the lateral limiting action of the inserted rods structurally locks the axial position of the counterweight discs 43, forming a double constraint with the limiting circular plates 44 at both ends of the counterweight rods 42, preventing the counterweight discs 43 from shifting or falling off along the counterweight rods 42 under long-term ocean current impacts. The counterweight rods 42 are also connected to the connecting ring 15 via a first rope 41. The second base plate 14 adopts a ring-shaped rotating body structure, with a reserved opening in the middle for mounting the counterweight assembly 40, so that the overall center of gravity is lowered and centered, thereby improving the stability and anti-overturning ability of the device on the seabed and avoiding displacement, tipping or overturning caused by water flow impact. Furthermore, the counterweight assembly 40 consists of a counterweight rod 42, a counterweight disc 43 whose number can be increased or decreased, and a limiting disc 44 at both ends, which can adjust the total amount of counterweight according to the sea depth, seabed type and tidal current intensity.

[0035] The present invention connects the counterweight rod 42 to the connecting ring 15 via the first rope 41, so that the counterweight assembly 40 remains centered throughout the entire process of device deployment, sinking and bottoming, ensuring that the device falls to the bottom quickly and accurately. In addition, the flexible connection can reduce the rigid disturbance of the main body of the device caused by the swing of the counterweight assembly 40, and reduce the vibration transmitted to the attachment 30, which may cause the fish eggs to fall off. Example 5

[0036] This example discloses the following solution: like Figure 8 As shown, the artificial reef for large yellow croaker includes a cylindrical shell 50, which is hollow inside and has a retractable tube 11 connected to it at the upper end. The retractable tube 11 is a rotating structure with through holes at both ends. The diameters of the two ends of the through holes are equal or unequal. The through holes penetrate the bottom shell 50. A protective cover 60 with multiple openings is detachably connected to the upper part of the retractable tube 11.

[0037] A cylindrical shell 50 is used as the main enclosure structure. The hollow inner cavity provides a safe habitat and spawning space for the large yellow croaker, and isolates it from external impacts from large organisms and entanglement with debris. The upper end of the shell 50 is equipped with a rotating constriction tube 11, whose through holes can be set with equal or variable diameters. It can smoothly guide the flow from top to bottom, reduce the water flow velocity entering the inner cavity, and prevent turbulent flow from directly washing away the attachment parts 30 and causing the fish eggs to fall off. At the same time, it guides the large yellow croaker to smoothly enter and exit the egg protection area. Furthermore, the upper part of the constriction tube 11 can be detachably connected to a protective cover 60. The protective cover 60 has multiple sets of openings, which can not only ensure normal water exchange and dissolved oxygen replenishment, but also effectively block predators from entering, further improving the safety of egg protection.

[0038] The shell 50 has a first bottom plate 13 at its bottom. The first bottom plate 13 is an annular plate with a through hole in its middle that communicates with the interior of the shell 50. The bottom of the first bottom plate 13 has a second bottom plate 14 spaced apart from it. The second bottom plate 14 is an annular rotating structure. The space between the first bottom plate 13 and the second bottom plate 14 has a vertically arranged connecting rod 16. The upper end of the connecting rod 16 is connected to the bottom of the first bottom plate 13, and the bottom of the connecting rod 16 is connected to the surface of the second bottom plate 14. The space between adjacent connecting rods 16 forms a channel for organisms, sediment and impurities at the bottom of the water to pass through. A connecting ring 15 is provided between adjacent connecting rods 16. The connecting ring 15 can be made of a flexible material to avoid damage to organisms, or it can be made of a rigid material, depending on the aquatic ecology and the organisms.

[0039] like Figure 9 As shown, the outer ring of the housing 50 is provided with a strip-shaped reinforcing strip 51. Example 6

[0040] This embodiment is based on the embodiment 1 and discloses the following solution: like Figure 3 As shown, the second base plate 14 has an opening in the middle. Figure 10 As shown, the opening in the middle of the second base plate 14 can be used to accommodate or connect the aeration device 70. Above the air outlet of the aeration device 70, there is a horizontally arranged aeration baffle 71. The aeration baffle 71 and the air outlet of the aeration device 70 are connected by a connecting column 72. There is a gap between the air outlets of the aeration baffle 71 and the aeration device 70. The aeration device 70 is a waterproof aeration device. The aeration device 70 is set in the opening in the middle of the second base plate 14 to continuously replenish dissolved oxygen in the egg protection area, improve the water environment for embryo development, and eliminate the problems of hypoxia and metabolic waste accumulation caused by dense fish eggs. The aeration baffle 71 is fixed above the aeration device 70 by the connecting column 72. The air outlet gap between the two is reserved to convert the vertically upward direct airflow into horizontally diffused uniform microbubbles, avoiding the direct impact of high-speed airflow on the large yellow croaker eggs on the attachment 30, preventing the fish eggs from being washed off, the egg membrane from being damaged, or the embryo development from being abnormal.

[0041] It should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," etc., 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0042] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art can make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as the technology or embodiments that are substantially the same as the present invention.

[0043] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A biomimetic artificial reef device for protecting the eggs of large yellow croaker, characterized in that, The device includes a first cover (10), at least one protective ring (20), and a first base plate (13) arranged sequentially from top to bottom. The first cover (10), the protective ring (20), and the first base plate (13) are connected through fasteners and nuts (12). A second base plate (14) is provided below the first base plate (13) at intervals. The first base plate (13) and the second base plate (14) are fixedly connected by several connecting rods (16). A connecting ring (15) is provided between adjacent connecting rods (16). The second base plate (14) is provided with an attachment piece (30) for attaching large yellow croaker eggs.

2. The artificial reef biomimetic egg-protecting device for large yellow croaker according to claim 1, characterized in that, The protective ring (20) includes an annular protective body (21), which has several through holes. The protective body (21) is surrounded by a first access channel (22) and a second access channel (24) that communicate with the internal space. A monitor (23) is installed in the first access channel (22) or the second access channel (24).

3. The artificial reef biomimetic egg-protecting device for large yellow croaker according to claim 1, characterized in that, The first cover (10) is provided with a shrink tube (11) on the upper part. The shrink tube (11) is a rotating body structure. It has a through hole that passes through the first cover (10). The first cover (10) and the first base plate (13) are both provided with through holes (17) for fasteners to pass through.

4. The artificial reef biomimetic egg-protecting device for large yellow croaker according to claim 1, characterized in that, The attachment (30) is a flexible strip-shaped spiral bending structure. The surface of the attachment (30) is provided with second openings (32) spaced apart. The second openings (32) are surrounded by a number of first openings (31) with a diameter smaller than that of the second openings (32).

5. The artificial reef biomimetic egg-protecting device for large yellow croaker according to claim 1, characterized in that, The second base plate (14) is an annular rotating body structure with an opening in the middle. A counterweight assembly (40) is installed in the opening. The counterweight assembly (40) includes a counterweight rod (42), at least one counterweight disc (43), and a limiting disc (44). The counterweight disc (43) is sleeved on the counterweight rod (42), and the limiting disc (44) is located at both ends of the counterweight rod (42) to prevent the counterweight disc (43) from falling off.

6. The artificial reef biomimetic egg-protecting device for large yellow croaker according to claim 5, characterized in that, The counterweight rod (42) is connected to the connecting ring (15) via the first rope (41).

7. The artificial reef biomimetic egg-protecting device for large yellow croaker according to claim 5, characterized in that, The counterweight rod (42) has an insert at its end to prevent it from detaching from the counterweight disc (43).

8. The artificial reef biomimetic egg-protecting device for large yellow croaker according to claim 1, characterized in that, The connecting rings (15) are arranged at intervals along the height direction of the connecting rod (16), and the spacing between the upper and lower connecting rings (15) is equal or unequal.

9. The artificial reef biomimetic egg-protecting device for large yellow croaker according to claim 1, characterized in that, The attachment (30) is connected to the second base plate (14) by adhesive or plugging, and the attachment (30) can flexibly swing with the water flow.

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