A cage structure capable of increasing fish habitat friendliness and its installation method

Abstract

The present invention relates to the technical field of marine aquaculture equipment, and discloses a cage structure and installation method thereof that can increase fish habitat friendliness. The cage structure includes jacket legs, breakwater net legs, an inner aquaculture net, an outer breakwater net, and an anchoring foundation. The jacket legs and breakwater net legs are paired and anchored to the seabed via an anchoring foundation, with multiple pairs of jacket legs and breakwater net legs forming a polygon at the anchoring points on the seabed. The inner aquaculture net is tied to the jacket legs to form an inner polygonal column, and the outer breakwater net is tied to the breakwater net legs to form an outer polygonal column. The inner aquaculture net and the outer breakwater net are divided into a pressure relief zone, a transition zone, and a habitat zone at the same height interval to improve fish habitat friendliness. Through mechanical analysis and aquaculture research, the present invention, based on the nonlinear distribution of ocean current energy along water depth, vertically divides the net into multiple functional zones to accommodate fish swimming in the upper layer and inhabiting the lower layer.

Description

Technical Field

[0001] The present invention relates to the technical field of marine aquaculture equipment, and in particular to a cage structure capable of increasing fish habitat friendliness and an installation method thereof. Background Art

[0002] In the field of deep-sea aquaculture, the design of traditional cage structures has long been constrained by the contradiction between two core issues: the difficulty of balancing the optimization of anti-flow load and fish habitat friendliness. This technical dilemma directly affects aquaculture efficiency and ecological sustainability.

[0003] Deep-sea aquaculture cages must simultaneously meet two seemingly contradictory physical field requirements: first, the fluid mechanics field requires the nets to have high strength and low resistance to withstand the impact of strong ocean currents and avoid structural damage; second, the biological habitat field requires the nets to have high permeability and a low noise environment to maintain normal feeding and migratory behavior of fish.

[0004] In traditional designs, these two requirements are in a trade-off relationship when selecting net parameters (mesh size, wire diameter). For example, while a small mesh size (≤20mm) can reduce instantaneous flow velocity, it significantly increases flow resistance (inversely proportional to mesh area), leading to an exponential increase in the overall load on the cage. Meanwhile, a large mesh size (≥50mm), while improving water exchange, causes the net to experience a "resonance effect" under wave action, accelerating structural fatigue. Summary of the Invention

[0005] To address existing problems, this invention provides a cage structure that enhances fish habitat friendliness. Through fluid dynamics analysis coupled with aquaculture ecological requirements, it was discovered that ocean current energy exhibits a nonlinear distribution along water depth: surface velocities are high but energy decays rapidly, while bottom velocities are low but the long-term effects are significant. Based on this principle, the net is vertically divided into three functional zones: the pressure relief zone (surface layer) utilizes large mesh size and high-diameter wire for rapid flow release to reduce transient impact; the transition zone (middle layer) maintains moderate parameters to balance load and permeability; and the habitat zone (bottom layer) utilizes small mesh size and low-diameter wire to accommodate natural water flow conditions and the fish's need to swim in the upper layers and inhabit the lower layers.

[0006] In order to achieve the above objectives, the present invention provides the following technical solutions.

[0007] The present invention provides a cage structure that can increase the friendliness of fish habitat, including a conductor frame support leg, a wave-breaking net support leg, an inner layer aquaculture net, an outer layer wave-breaking net and an anchoring foundation; the conductor frame support legs and the wave-breaking net support legs are anchored to the seabed base bed in pairs through the anchoring foundation, and multiple pairs of conductor frame support legs and wave-breaking net support legs form a polygon at the anchoring point of the seabed base bed; the inner layer aquaculture net and the conductor frame support legs are tied and connected to form an inner layer polygonal column; the outer layer wave-breaking net and the wave-breaking net support legs are tied and connected to form an outer layer polygonal column; the inner layer aquaculture net and the outer layer wave-breaking net are divided into a pressure relief zone, a transition zone and a habitat zone according to the same height range to improve the friendliness of fish habitat.

[0008] As a further improvement of the present invention, the wave-breaking net legs are vertically extended into the anchor foundation for fixation, the conductor frame legs are obliquely extended into the anchor foundation for fixation, and the center line angle α between the wave-breaking net legs and the conductor frame legs is 5°~8°; the inner layer aquaculture net and the outer layer wave-breaking net are staggered at the bottom of the cage structure to form an enclosure.

[0009] As a further improvement of the present invention, the total length of the wave-breaking net legs is H; the height ranges of the pressure relief zone, transition zone and habitat zone are 0.2H~0.4H, 0.2H~0.4H and 0.3H~0.5H respectively.

[0010] As a further improvement of the present invention, the foot sizes of the pressure relief zone, transition zone and habitat zone range from 44mm to 55mm, 35mm to 45mm and 25mm to 35mm respectively.

[0011] As a further improvement of the present invention, the diameter size ranges of the mesh wires in the pressure relief zone, transition zone and habitat zone are 4.0mm~4.6mm, 3.2mm~4.0mm and 2.5mm~3.2mm respectively.

[0012] As a further improvement of the present invention, the diameter of the wave-breaking net legs is greater than 1 / 5 of the diameter of the anchor foundation, the diameter of the wave-breaking net legs is smaller than the diameter of the jacket legs, and the diameter of the jacket legs is smaller than 2 / 5 of the diameter of the anchor foundation.

[0013] As a further improvement of the present invention, the inner layer aquaculture net and the outer layer wave-breaking net of the habitat are both made of low-resistance coating materials with a surface roughness of less than or equal to 0.05 mm.

[0014] As a further improvement of the present invention, it also includes a tension adjustment device; the connection between the inner layer aquaculture net and the conductor frame support legs adopts an adjustable tension device to achieve dynamic adjustment of the net pre-tightening force; the connection between the outer layer wave-breaking net and the wave-breaking net support legs adopts an adjustable tension device to achieve dynamic adjustment of the net pre-tightening force.

[0015] As a further improvement of the present invention, the outer layer of the outer wave-breaking net is a double-layer structure, the outer layer is high-density polyethylene (HDPE) material, and the inner layer is nylon (PA) material. The double-layer structure is formed into a composite structure by hot-melt welding; the anchoring foundation adopts a combined structure of gravity anchor blocks and suction anchors.

[0016] The present invention also provides a method for installing a cage structure capable of increasing fish habitat friendliness, comprising the following steps:

[0017] Modular assembly is carried out on land, where the jacket legs, wave-breaking net legs, pre-partitioned inner aquaculture nets, outer wave-breaking nets and anchor foundation components are pre-assembled into transport modules;

[0018] Use the sonar positioning system to determine the cage installation location in the predetermined deep-sea area; use the underwater robot to lift the transport module to the predetermined location;

[0019] Install the anchor foundation at the preset positions around the cage, connect the jacket legs and the wave-breaking net legs, and use underwater monitoring equipment to adjust the anchor foundation layout to ensure that the angle between the jacket legs and the wave-breaking net legs meets the requirements of fluid mechanics optimization;

[0020] Unfold and install the inner layer aquaculture net and outer layer wave-breaking net in the pressure relief area, transition area and habitat area in sequence. If there is an adjustable tension device, use the tension adjustment structure to pre-tighten the net to ensure that the initial tension at the connection between the net and the legs meets the design requirements.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This device uses a system-level design approach to organically combine fluid mechanics optimization with ecological habitat requirements. By integrating the jacket legs, wave-breaking net legs, double-layer netting, and anchoring foundation, a modular structure is formed, significantly improving the overall stability and installation efficiency of the cage. The netting is designed according to functional pre-zoning (pressure relief zone, transition zone, and habitat zone), which can optimize the water flow environment in a targeted manner, strike a balance between anti-flow load and fish habitat needs, and meet the space requirements of fish schools swimming in the upper layers and living in the lower layers, thereby reducing the obstruction of fish swimming in the deep-sea environment by the netting and improving the ecological friendliness of aquaculture. At the same time, the habitat area is set at the bottom of the cage, which can save the cost of building bionic fish reefs or artificial concrete facilities on the seabed.

[0023] Preferably, the wave-breaking net legs and the jacket legs are arranged at an angle of 5° to 8°, which can guide the direction of the ocean current, reduce direct impact, and reduce the risk of structural fatigue; and form a space design that is narrow at the bottom and wide at the top to meet the needs of fish inhabiting the lower layer and swimming in the upper layer; the inner layer of aquaculture net and the outer layer of wave-breaking net are enclosed at the bottom of the cage structure, reducing the risk of fish leakage, eliminating the need to add bottom nets, and saving material and installation costs; this angle range has been optimized through fluid mechanics to improve the flow resistance without significantly increasing the resistance, reduce load vibration and extend the life of the cage.

[0024] Preferably, the height intervals of the nets are divided proportionally (0.2H~0.4H for the pressure relief zone, 0.2H~0.4H for the transition zone, and 0.3H~0.5H for the habitat zone) to ensure that the functions of each zone are accurately realized; according to the biology of marine fish schools, vertical partitions are set proportionally so that the pressure relief zone can efficiently disperse the energy of the ocean current, the transition zone can be smoothly connected, and the habitat zone can provide a suitable water flow environment, thus realizing "zoning optimization and overall coordination."

[0025] Preferably, a gradient design of mesh foot size is adopted (44mm~55mm in pressure relief zone, 35mm~45mm in transition zone, 25mm~35mm in habitat zone), which not only ensures the flow resistance of the pressure relief zone, but also avoids insufficient water exchange in the habitat zone due to too small mesh size; the mesh foot size is negatively correlated with the water flow resistance. This design can significantly reduce the overall load and balance the load-bearing and water flow conditions of the partitions, ensuring that the fish swim in the upper layer and live in the lower layer.

[0026] Preferably, the mesh wire diameter is designed with a gradient (4.0mm~4.6mm in the pressure relief zone, 3.2mm~4.0mm in the transition zone, and 2.5mm~3.2mm in the habitat zone) to match the functional requirements of each zone; the thick mesh wire enhances the impact resistance of the pressure relief zone, and the thin mesh wire reduces the water flow disturbance in the habitat zone. The combination of the two can ensure stable mechanical properties and reduce material costs.

[0027] Preferably, the diameter ratio of the legs and the anchor foundation is designed (d1>D / 5, d2>d1, d2<2 / 5D) to ensure structural stability; the larger diameter of the wave-breaking net legs can disperse the current load, the moderate diameter of the jacket legs takes into account both strength and cost, and the anchor foundation is large enough to provide stable support.

[0028] Preferably, the habitat uses a low-resistance coating (Ra≤0.05mm), which can reduce water flow noise and reduce fish stress response; at the same time, it can reduce water disturbance, improve the uniformity of dissolved oxygen distribution, and improve the living environment of fish.

[0029] Preferably, the adjustable tension device can realize dynamic adjustment of the net pre-tightening force to adapt to different sea conditions; for example, the pre-tightening force can be increased before a typhoon to improve the flow resistance, and appropriately relaxed at other times to optimize water exchange and extend the life of the net.

[0030] Preferably, the outer wave-breaking net adopts a double-layer structure of HDPE+PA. The outer layer of HDPE is UV-resistant and corrosion-resistant, and the inner layer of PA is high-strength and low-elongation. The composite anchoring system (gravity anchor + suction anchor) adapts to complex seabed geology and significantly improves pull-out resistance.

[0031] Preferably, the modular installation method is combined with sonar positioning to improve deep-sea installation efficiency; dynamic preload adjustment technology reduces manual diving operations and reduces installation costs; full-process monitoring ensures installation accuracy and reduces the risk of structural failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are merely schematic and are used to facilitate understanding of the present invention. They are not intended to limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0033] Figure 1 Schematic diagram of a cage structure that can increase fish habitat friendliness in an embodiment;

[0034] Figure 2 A cross-sectional view of an anchoring foundation of a cage structure that can increase fish habitat friendliness in an embodiment;

[0035] Figure 3 A top view of a cage structure that can increase fish habitat friendliness in an embodiment;

[0036] Figure 4 Schematic diagram of a cage structure net that can increase fish habitat friendliness in an embodiment;

[0037] Figure 5 This is a schematic diagram of a cage structure partition arrangement that can increase fish habitat friendliness in an embodiment.

[0038] Among them, 1. Jacket support legs; 2. Wave-breaking net support legs; 3. Inner aquaculture net; 4. Outer aquaculture net; 5. Anchor foundation. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0040] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] like Figure 1 and Figure 2 As shown, this embodiment provides a cage structure that can increase the friendliness of fish habitat, including a conductor frame leg 1, a wave-breaking net leg 2, an inner layer aquaculture net 3, an outer layer wave-breaking net 4 and an anchoring foundation 5; the conductor frame leg 1 and the wave-breaking net leg 2 are anchored to the seabed in pairs through the anchoring foundation 5, and multiple pairs of conductor frame legs 1 and wave-breaking net legs 2 form a polygon at the anchoring point of the seabed; the inner layer aquaculture net 3 is tied and connected to the conductor frame leg 1 to form an inner layer polygonal column; the outer layer wave-breaking net 4 is tied and connected to the wave-breaking net leg 2 to form an outer layer polygonal column; the inner layer aquaculture net 3 and the outer layer wave-breaking net 4 are divided into a pressure relief zone, a transition zone and a habitat zone according to the same height range to improve the friendliness of fish habitat.

[0043] like Figure 2 As shown, the breakwater net legs 2 extend vertically into the anchor foundation 5 for fixation, while the jacket legs 1 extend obliquely into the anchor foundation 5 for fixation. The centerline angle α between the breakwater net legs 2 and the jacket legs 1 is 5° to 8°. The inner aquaculture net 3 and the outer breakwater net 4 intersect at the bottom of the cage structure, forming a closed enclosure. The 5° to 8° angle between the breakwater net legs 2 and the jacket legs 1 guides the current, reduces direct impact, and mitigates structural fatigue risk. This creates a narrower bottom and wider top design, accommodating the needs of fish that inhabit the lower layers and swim above, while also minimizing fish leakage. This angle range, optimized through fluid dynamics, improves flow resistance without significantly increasing resistance, reducing load vibration and extending the cage's lifespan.

[0044] like Figure 2As shown in the figure, the jacket leg 1 is cylindrical with an outer diameter of d1; the wave protection net leg 2 is cylindrical with an outer diameter of d2; the anchoring foundation is cylindrical with an outer diameter of D. In order to enable the jacket leg 1 and the wave protection net leg 2 to extend into the anchoring foundation in pairs for fixation, both d1 and d2 are smaller than D, and the sum of d1 and d2 is also smaller than D. Because the inner layer aquaculture net 3 on the inner side is subject to more impacts from aquaculture organisms and has a greater load, the jacket leg 1 is thicker than the wave protection net leg 2. Based on the above principle, the diameter d1 of the wave protection net leg 2 is greater than 1 / 5 of the diameter D of the anchoring foundation, the diameter d1 of the wave protection net leg 2 is smaller than the diameter d2 of the jacket leg 1, and the diameter d2 of the jacket leg 1 is smaller than 2 / 5 of the diameter of the anchoring foundation, that is, 0.2D < d1 < d2 < 0.4D. Specifically, D = 2m, d1 = 0.4m, and d2 = 0.6m. The design of the diameter ratio of the legs to the anchoring foundation 5 ensures the structural stability; the wave protection net leg 2 can disperse the sea current load, and the jacket leg 1 with a larger diameter bears the load of aquaculture organisms. The designs of both take into account strength and cost, and the anchoring foundation 5 is large enough to provide a stable support.

[0045] The total length of the wave protection net leg 2 is H; the height ranges of the pressure relief area, the transition area, and the habitat area are 0.2H~0.4H, 0.2H~0.4H, and 0.3H~0.5H respectively. Divide the height interval of the netting by proportion to ensure the accurate realization of the functions of each area; according to the biology of marine fish schools, set the partitions vertically by proportion so that the pressure relief area can efficiently disperse the sea current energy, the transition area can be smoothly connected, and the habitat area can provide a suitable water flow environment, realizing "partition optimization and overall coordination".

[0046] According to the simulation of the calculation software, the initial conditions are set as follows: the length, width, and height of the net cage structure are 25m * 25m * 30m, the heights of the pressure relief area, the transition area, and the habitat area are all 10m, and the distance from the bottom of the cage to the seabed is 10m.

[0047] Under the same wire diameter, the relationship between the mesh foot size and the load magnitude is as follows:

[0048]

[0049] Generally, the seabed topography and geological conditions are stable. The closer the structure built in the sea is to the sea level, the greater the influence of wind, tides, and sea currents, and the higher the surface flow velocity. At this time, the load on the upper part of the netting is greater; based on this principle, the mesh foot sizes of the habitat area, the pressure relief area, and the transition area increase in sequence, which can increase the passage of high-flow velocity seawater in the upper layer and reduce the frictional resistance, thus reducing the load borne by the netting.

[0050] In this embodiment, the mesh sizes of the pressure relief zone, transition zone, and habitat zone range from 44mm to 55mm, 35mm to 45mm, and 25mm to 35mm, respectively. This gradient mesh size design ensures flow resistance in the pressure relief zone while preventing insufficient water exchange in the habitat zone due to small mesh openings. Since mesh size is negatively correlated with water flow resistance, this design significantly reduces overall load and balances load and water flow across the zones, ensuring that fish can swim in the upper layers and inhabit the lower layers.

[0051] According to the simulation of the calculation software, the initial conditions are set as follows: the length, width and height of the cage structure are 25m * 25m * 30m, the height of the pressure relief zone, transition zone and habitat zone are all 10m, and the distance between the bottom of the cage and the seabed is 10m.

[0052] Under the same mesh size, the relationship between the diameter of the mesh and the load size is:

[0053]

[0054] Generally speaking, the seabed topography and geological conditions are stable. The closer the structure built in the sea is to the sea level, the greater the impact of wind, tides and currents, and the higher the surface flow velocity, the greater the load on the upper part of the net. Based on this principle, the diameter of the net line in the habitat area, pressure relief area and transition area increases successively, which can increase the load-bearing capacity to adapt to the load formed by the high-velocity seawater in the upper layer, thereby improving the strength and safety of the net.

[0055] In this embodiment, the mesh wire diameters in the pressure relief zone, transition zone, and habitat zone range from 4.0mm to 4.6mm, 3.2mm to 4.0mm, and 2.5mm to 3.2mm, respectively. This gradient mesh wire diameter design matches the functional requirements of each zone. Coarse mesh wire enhances impact resistance in the pressure relief zone, while fine mesh wire reduces water flow disturbance in the habitat zone. This combination ensures stable mechanical properties and reduces material costs.

[0056] The inner layer aquaculture net 3 and the outer layer wave-breaking net 4 of the habitat are both made of low-resistance coating materials with a surface roughness of less than or equal to 0.05mm, so as to reduce water flow noise and water disturbance, and reduce fish stress response; at the same time, reduce water disturbance, improve the uniformity of dissolved oxygen distribution, and improve the living environment of fish.

[0057] The present invention also provides a method for installing a cage structure capable of increasing fish habitat friendliness, comprising the following steps:

[0058] Modular assembly is performed on land, where the jacket legs 1, the wave-breaking net legs 2, the pre-partitioned inner aquaculture net 3, the outer wave-breaking net 4, and the anchor foundation 5 are pre-assembled into a transport module;

[0059] Use the sonar positioning system to determine the cage installation location in the predetermined deep-sea area; use the underwater robot to lift the transport module to the predetermined location;

[0060] Install the anchor foundation 5 at the preset positions around the cage, connect the jacket legs 1 and the wave-breaking net legs 2, and use underwater monitoring equipment to adjust the layout of the anchor foundation 5 to ensure that the angle between the jacket legs 1 and the wave-breaking net legs 2 meets the requirements of fluid mechanics optimization;

[0061] Unfold and install the inner aquaculture net 3 and outer wave-breaking net 4 in the pressure relief area, transition area, and habitat area in sequence. If there is an adjustable tension device, use the tension adjustment structure to pre-tighten the net to ensure that the initial tension at the connection between the net and the legs meets the design requirements.

[0062] This installation method uses modular installation and combines sonar positioning to improve deep-sea installation efficiency; dynamic preload adjustment technology reduces manual diving operations and reduces installation costs; full-process monitoring ensures installation accuracy and reduces the risk of structural failure.

[0063] Example 2

[0064] The difference between this embodiment and embodiment 1 is that:

[0065] 1) The cage structure of this embodiment, which can increase the friendliness of fish habitats, also includes an adjustable tension device; the inner aquaculture net 3 is connected to the jacket leg 1 using an adjustable tension device to achieve dynamic adjustment of the net preload force; the outer wave-breaking net 4 is connected to the wave-breaking net leg 2 using an adjustable tension device to achieve dynamic adjustment of the net preload force.

[0066] 2) The outer wave-breaking net 4 is a double-layer structure, with the outer layer being made of high-density polyethylene (HDPE) material and the inner layer being made of nylon (PA) material. The double-layer structure is formed into a composite structure by hot-melt welding; the anchor foundation 5 adopts a combined structure of a gravity anchor block and a suction anchor.

[0067] The adjustable tension device can adopt a spiral buckle structure, which includes a screw, nut, frame and connectors. One end of the spiral buckle is tied to the longitudinal frame of the net, and the other end of the spiral mouth is fixed to the jacket leg 1 or the wave-breaking net leg 2. The adjustable tension device can realize dynamic adjustment of the net preload to adapt to different sea conditions. For example, the preload can be increased before a typhoon to improve the flow resistance, and it can be appropriately relaxed at other times to optimize water exchange and extend the life of the net.

[0068] The outer net 4 has a double-layer structure, with an outer layer made of high-density polyethylene (HDPE) and an inner layer made of nylon (PA). The double-layer structure is formed by heat-melting and welding. The outer net 4 uses a double-layer HDPE + PA structure. The HDPE outer layer is UV-resistant and corrosion-resistant, while the PA inner layer is high-strength and low-elongation.

[0069] The anchoring foundation 5 is a combination of a gravity anchor block and a suction anchor. The composite anchoring system (gravity anchor + suction anchor) adapts to complex seabed geology and significantly improves pullout resistance.

[0070] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention.

Claims

1. A cage structure that can increase the friendliness of fish habitat, characterized in that: The invention comprises a jacket support leg (1), a wave-breaking net support leg (2), an inner layer aquaculture net (3), an outer layer wave-breaking net (4) and an anchoring foundation (5); the jacket support leg (1) and the wave-breaking net support leg (2) are anchored to the seabed in pairs through the anchoring foundation (5); multiple pairs of jacket support legs (1) and wave-breaking net support legs (2) form a polygon at the anchoring point of the seabed; the inner layer aquaculture net (3) and the jacket support leg (1) are tied and connected to form an inner layer polygonal column; the outer layer wave-breaking net (4) and the wave-breaking net support leg (2) are tied and connected to form an outer layer polygonal column; the inner layer aquaculture net (3) and the outer layer wave-breaking net (4) are divided into a pressure relief zone, a transition zone and a habitat zone according to the same height range, so as to improve the fish habitat friendliness; The wave-breaking net legs (2) are vertically extended into the anchor foundation (5) for fixation, the jacket frame legs (1) are obliquely extended into the anchor foundation (5) for fixation, and the angle α between the center lines of the wave-breaking net legs (2) and the jacket frame legs (1) is 5° to 8°; the inner layer aquaculture net (3) and the outer layer wave-breaking net (4) are staggered at the bottom of the cage structure to form an enclosure; The diameter of the wave-breaking net leg (2) is greater than 1 / 5 of the diameter of the anchor foundation (5), the diameter of the wave-breaking net leg (2) is smaller than the diameter of the jacket leg (1), and the diameter of the jacket leg (1) is smaller than 2 / 5 of the diameter of the anchor foundation (5); The invention also includes a tension adjustment device; the inner layer aquaculture net (3) is connected to the conductor frame support leg (1) by an adjustable tension device to achieve dynamic adjustment of the net pre-tightening force; the outer layer wave-breaking net (4) is connected to the wave-breaking net support leg (2) by an adjustable tension device to achieve dynamic adjustment of the net pre-tightening force.

2. A cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The total length of the wave-breaking net legs (2) is H; the height ranges of the pressure relief zone, transition zone and habitat zone are 0.2H~0.4H, 0.2H~0.4H and 0.3H~0.5H respectively.

3. A cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The foot sizes of the pressure relief zone, transition zone and habitat zone range from 44mm to 55mm, 35mm to 45mm and 25mm to 35mm respectively.

4. The cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The diameter ranges of the mesh wires in the pressure relief zone, transition zone and habitat zone are 4.0mm~4.6mm, 3.2mm~4.0mm and 2.5mm~3.2mm respectively.

5. The cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The inner layer aquaculture net (3) and the outer layer wave-breaking net (4) of the habitat are both made of low-resistance coating materials, and the surface roughness is less than or equal to 0.05 mm.

6. The cage structure capable of increasing fish habitat friendliness according to claim 1, characterized in that: The outer wave-breaking net (4) is a double-layer structure, the outer layer is made of high-density polyethylene (HDPE) material, and the inner layer is made of nylon (PA) material. The double-layer structure is formed into a composite structure by hot-melt welding; the anchoring foundation (5) adopts a combined structure of a gravity anchor block and a suction anchor.

7. A method for installing a cage structure capable of increasing fish habitat friendliness according to any one of claims 1 to 6, characterized in that: The following steps are involved: Modular assembly is performed on land, whereby the jacket legs (1), the wave-breaking net legs (2), the pre-partitioned inner layer aquaculture net (3), the outer layer wave-breaking net (4) and the anchoring foundation (5) are pre-assembled into a transport module; Use the sonar positioning system to determine the cage installation location in the predetermined deep-sea area; use the underwater robot to lift the transport module to the predetermined location; Install the anchor foundation (5) at the preset position around the cage, connect the jacket legs (1) and the wave-breaking net legs (2), and use underwater monitoring equipment to adjust the layout of the anchor foundation (5) to ensure that the angle between the jacket legs (1) and the wave-breaking net legs (2) meets the requirements of fluid mechanics optimization; The inner layer aquaculture net (3) and the outer layer wave-breaking net (4) of the pressure relief zone, transition zone, and habitat zone are sequentially unfolded and installed. If there is an adjustable tension device, the tension adjustment structure is used to pre-tighten the net to ensure that the initial tension at the connection between the net and the legs meets the design requirements.

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