Biological habitat structure body, biological habitat structure, and method for retrieving biological habitat structure body

Abstract

To provide, e.g., a biological habitat structure body that can accommodate a wide variety of living organisms and allows easy installation and retrieval operations.SOLUTION: Multiple hollow bodies 9 are filled above a mat 7 inside a basket body 5. The hollow bodies 9 are, e.g., approximately cylindrical members, and e.g., made of resin or bamboo. The hollow bodies 9 are composed of a material having a specific gravity greater than 1 (in the case of bamboo, a specific gravity of 1 or more can be achieved by water absorption). A hollow body connecting wire 11 is inserted through the multiple hollow bodies 9, that is, the multiple hollow bodies 9 are connected by the hollow body connecting wire 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a habitat structure that serves as a habitat for fish, shellfish, and the like. [Background technology]

[0002] For example, studies are underway to install artificial reefs that artificially create habitats for fish and shellfish in the water. For example, a reef with a cage-like structure filled with stone has been proposed. In such artificial reefs, the gaps between the stones become habitats for fish, as well as shrimp, crabs, aquatic insects, and other creatures that serve as food for the fish.

[0003] On the other hand, in order to ensure biodiversity among a large number of biological species and to systematically conserve the natural environment, it is first necessary to understand the distribution of each biological species.As a method for monitoring such organisms, for example, a biological capture means has been proposed in which a cage made of mesh members with a mesh size large enough for the target organisms to pass through is filled with stones, and when capturing organisms, the side covering part of the bag-like body is expanded to cover the cage body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-57046 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with conventional capture methods, the cage must be filled with a large amount of stone, making installation and capture / recovery difficult. For example, when filling the cage with stone on land, a crane or similar device is required to place the cage filled with stone underwater. Another method involves manually filling the cage with stone after placing it underwater, but this is difficult unless the water is shallow.

[0006] Furthermore, after installing the fishing reef underwater, in order to capture the organisms that have taken up residence inside, it is necessary to cover the cage body with the aforementioned bag-like body and then lift it onto land using a crane or the like. For this reason, the work cannot be carried out from a small pier or the like where it is difficult to install a lifting machine. Furthermore, because the work is so large-scale, it is difficult to, for example, check for organisms at frequent, regular intervals. As such, the conventional method is difficult to install and retrieve, and there are limitations on the water areas where it can be installed.

[0007] Furthermore, when the stones are filled in, the porosity between the stones becomes approximately 20% or less, and low-oxygen areas form in the gaps between the stones. For this reason, fish with low oxygen consumption, such as eels, can live there, but fish with high oxygen consumption, such as sweetfish, salmon, trout, carp, crucian carp, and catfish, cannot use the reef as a hiding place and live there.

[0008] The present invention has been made in consideration of the above problems, and aims to provide a biological habitat structure, etc. that can accommodate a wide variety of organisms and can be easily installed and retrieved. [Means for solving the problem]

[0009] The first invention for solving the above-mentioned problems is a biological habitat structure comprising a cage body, a hollow body filled inside the cage body, and a water-permeable covering material capable of covering the bottom and sides of the cage body, and characterized in that multiple hollow bodies are connected by wire for connecting the hollow bodies.

[0010] It is desirable that the plurality of hollow bodies can be removed from the cage body all at once by pulling up the hollow body connecting wire.

[0011] The hollow bodies may be of a variety of types with different lengths or diameters.

[0012] The hollow body may be substantially cylindrical, and may have a hole formed in the side surface thereof that communicates with the internal space.

[0013] The covering material is preferably a mesh of a moji net having finer mesh than the mesh of the cage body.

[0014] It is desirable that the covering material be temporarily fixed in a state where it is lowered below the cage body, and that by pulling up the covering material, the temporary fixation is released and the covering material can cover the sides of the cage body.

[0015] It is desirable that an upper frame material be fixed above the covering material, a wire for pulling up the covering material be connected to the upper frame material, and that by pulling up the wire for pulling up the covering material, the sides of the cage body can be covered with the covering material.

[0016] It is desirable that the porosity, which is the total volume of the internal spaces of the hollow bodies and the spaces between the hollow bodies, relative to the internal volume of the cage body is 50% or more.

[0017] According to the first invention, the cage is filled with hollow bodies, making it lightweight and easy to install and retrieve. Furthermore, at least some of the hollow bodies are connected to each other by wires for connecting the hollow bodies, making it easy to remove the hollow bodies from inside the cage. Furthermore, compared to stone, the porosity is higher, and low-oxygen areas are less likely to form even when installed underwater, making it possible to provide hiding places for a variety of organisms. Furthermore, because it is lightweight, it can be installed not only on the ground or the bottom of the water, but also held floating in the water.

[0018] Furthermore, by connecting all the hollow bodies in the cage with a wire for connecting the hollow bodies, it becomes possible to remove the hollow bodies all at once.

[0019] Furthermore, by mixing hollow bodies of different sizes, such as length and thickness, it is possible to provide suitable habitats for different types and sizes of living organisms.

[0020] Furthermore, by forming holes in the side surfaces of the hollow body that communicate with the interior, it is possible to prevent the interior of the hollow body from becoming a low-oxygen area.

[0021] Furthermore, if the covering material is a moji net, it can hold the organisms with high strength. Also, the mesh of the moji net is fine enough to ensure that the captured organisms can be recovered. Furthermore, the water inside the net immediately flows out when it is pulled up, making the work of pulling it up easy.

[0022] In addition, since the covering material is temporarily fixed in place while lowered below the cage, it is possible to prevent the covering material from rolling up and blocking the sides of the cage when it is installed. Furthermore, when the covering material is pulled up, the temporary fixing is released, so the cage can be easily covered with the covering material from above the water.

[0023] Furthermore, by fixing the upper frame member to the top of the covering material, the shape of the opening at the top of the covering material is maintained, which prevents the covering material from getting caught on the cage body when pulled up, allowing the covering material to be pulled up more reliably to cover the side surface of the cage body.

[0024] By filling the cage with hollow bodies in this way, the porosity inside the cage can be increased to 50% or more.

[0025] The second invention is a biological habitat structure in which the biological habitat structure of the first invention is installed underwater, characterized in that the biological habitat structure is installed on the bottom of the water, and a wire for pulling up the cage body and a portion of the wire for pulling up the covering material are positioned above the water.

[0026] According to the second invention, organisms living on the water bottom can be efficiently captured. In this case, by placing the wire for pulling up the cage body and the wire for pulling up the covering material above the water, the covering material and the cage body can be easily pulled up to the surface of the water.

[0027] The third invention is a biological habitat structure in which the biological habitat structure of the first invention is installed underwater, characterized in that the biological habitat structure is suspended underwater away from the bottom of the water, and a wire for pulling up the cage body and a part of the wire for pulling up the covering material are positioned above the water.

[0028] According to the third aspect of the present invention, fish and shellfish that live in the middle and upper layers of the water other than the bottom can be efficiently captured.

[0029] The fourth invention is a biological habitat structure in which the biological habitat structure of the first invention is installed on the ground, and the biological habitat structure is installed on the ground, and a wire for pulling up the cage body and a part of the wire for pulling up the covering material are arranged above.

[0030] According to the fourth aspect of the present invention, it is possible to efficiently capture terrestrial organisms.

[0031] The fifth invention is a method for lifting a biological habitat structure of the first invention, characterized in that it comprises the steps of lifting the covering material to cover the sides of the cage body, lifting the cage body upward, and removing the hollow body from inside the cage body.

[0032] According to the fifth aspect of the present invention, first, the covering material is pulled up to cover the cage body, thereby ensuring the capture of the organisms inside. Furthermore, when the cage body is pulled up in this state, the hollow body inside is lightweight, so the work can be done manually. Furthermore, by removing the hollow body beforehand when pulling up the cage body, it becomes even lighter, making the recovery work easier. [Effects of the Invention]

[0033] According to the present invention, it is possible to provide a habitat structure or the like that can accommodate a wide variety of organisms and that can be easily installed and retrieved. [Brief explanation of the drawings]

[0034] [Figure 1] FIG. 1 is an exploded perspective view of the habitat structure 1. [Figure 2] FIG. 2 is a diagram showing the assembled state of the habitat structure 1. [Figure 3] Cross-sectional view of habitat structure 1. [Figure 4] 1(a) is a diagram showing a state in which the covering material 3 is temporarily fixed below the cage body 5, and FIG. 1(b) is a diagram showing a state in which the covering material 3 has been pulled up and the temporary fixation has been released. [Figure 5] FIG. [Figure 6] 1(a) is a diagram showing the process of installing the habitat structure 1, and FIG. 1(b) is a diagram showing the fishing reef structure 25 on which the habitat structure 1 is installed. [Figure 7] 10(a) and 10(b) are diagrams showing the process of lifting up the habitat structure 1. FIG. [Figure 8] 10(a) and 10(b) are diagrams showing the process of lifting up the habitat structure 1. FIG. [Figure 9] A diagram showing the state in which the biological habitat structure 1 is pulled up. [Figure 10] 1(a) and 1(b) are diagrams showing a method for fixing the habitat structure 1 to the bottom of the water. [Figure 11] A diagram showing a fishing reef structure 25a on which a biological habitat structure 1 is installed. [Figure 12] 1(a) is a diagram showing a habitat structure 25b in which the habitat structure 1 is installed, and FIG. 1(a) is a diagram showing a habitat structure 25c in which the habitat structure 1 is installed. DETAILED DESCRIPTION OF THE INVENTION

[0035] A first embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 1 is an exploded perspective view of a biological habitat structure 1, Fig. 2 is an assembled perspective view of the biological habitat structure 1, and Fig. 3 is a cross-sectional view of the biological habitat structure 1 (for simplicity, the illustration of the wires for connecting the hollow bodies is omitted). The biological habitat structure 1 is mainly composed of a covering material 3, a cage body 5, a mat 7, a hollow body 9, etc.

[0036] The cage body 5 is box-shaped with an opening at the top, and may be, for example, a roughly rectangular parallelepiped (cubic) shape as shown in the figure. The shape of the cage body 5 may be circular in plan view, or may be a polygon other than a rectangle. The cage body 5 is, for example, a box-shaped assembly of hexagonal netting made of synthetic resin such as polyester monofilament, and is self-standing. A portion of the mesh on the side of the cage body 5 may be cut to form an opening larger than the mesh that makes up the cage body 5.

[0037] As shown in Figures 2 and 3, cage body lifting wires 17 are connected to the top of the cage body 5. The cage body lifting wires 17 are connected at predetermined intervals at the top of the cage body 5 so that they can be suspended in a balanced manner. Note that multiple cage body lifting wires 17 may be combined into one at the top.

[0038] The covering material 3 is formed in a bag shape with an opening at the top, and the cage body 5 is housed inside the covering material 3. The covering material 3 is a member that can cover at least the bottom and sides of the cage body 5. As the covering material 3, for example, a moji net that is water permeable and can be folded can be used. If the covering material 3 is a moji net, it can hold living organisms with high strength. Furthermore, if the covering material 3 is water permeable, even when it is used as a fishing reef in water, the water inside the covering material 3 immediately flows out when it is pulled up, making the pulling up operation described below easier. Note that the covering material 3 does not have to be in the shape of a mesh.

[0039] An upper frame member 13 is fixed to the upper opening of the covering material 3 as needed. The upper frame member 13 is made of wire having a certain degree of rigidity. For example, the polyester monofilament wire that constitutes the cage body 5 can be used as the upper frame member 13. The shape of the opening of the covering material 3 is maintained by the upper frame member 13. A plurality of covering material lifting wires 15 are connected to the upper frame member 13. The covering material lifting wires 15 are fixed to the upper frame member 13 at predetermined intervals so that the covering material 3 can be pulled upward in a balanced manner, and may be unified above, separately from the cage body lifting wires 17.

[0040] As described above, the covering material 3 can be folded into any shape. For example, as shown in Figures 2 and 3, before the habitat structure 1 is installed, the covering material 3 is folded under the cage body 5. In this state, the covering material 3 covers only the bottom surface of the cage body 5, and the sides of the cage body 5 are exposed.

[0041] FIG. 4(a) is a schematic diagram showing a state in which the covering material 3 is folded and held below the cage body 5. A fixing portion 21 is provided near the upper portion of the covering material 3 (for example, the upper frame member 13). The fixing portion 21 is made of an easily deformable wire material such as aluminum wire, and is formed in a hook shape. The fixing portion 21 is temporarily fixed below the cage body 5. In other words, the covering material 3 is temporarily fixed in a lowered state below the cage body 5, and the covering material 3 is prevented from unintentionally covering the side of the cage body 5.

[0042] 4(b), when the wire 15 for pulling up the covering material is pulled up, the upper frame material 13 is pulled up. At this time, the fixing portion 21 is deformed, the temporary fixation is released, and the covering material 3 is pulled up. In other words, by pulling up the covering material 3 with the wire 15 for pulling up the covering material, the temporary fixation by the fixing portion 21 is released, and the sides of the cage body 5 can be covered with the covering material 3.

[0043] A mat 7 is placed at the bottom of the cage body 5. The mat 7 is permeable and serves as a filter layer that can prevent soil and sand from the bottom of the water from penetrating into the cage body 5. The mat 7 is, for example, a nonwoven fabric.

[0044] A plurality of hollow bodies 9 are filled inside the cage body 5 above the mat 7. The hollow bodies 9 are, for example, approximately cylindrical members made of resin or bamboo. The hollow bodies 9 are made of a material with a specific gravity of more than 1 (in the case of bamboo, the specific gravity is set to 1 or more due to water content). A wire 11 for connecting the hollow bodies is inserted through the plurality of hollow bodies 9. In other words, the plurality of hollow bodies 9 are connected by the wire 11 for connecting the hollow bodies.

[0045] 5 is a diagram showing the hollow body 9. A plurality of holes 19 that communicate with the internal space are formed on the side surface of the hollow body 9. By forming holes 19 that communicate with the interior on the side surface of the hollow body 9 in this way, the inside of the hollow body 9 can be prevented from becoming a low-oxygen area even when the hollow body is placed underwater.

[0046] The shape of the hollow bodies 9 is not limited to a cylindrical shape, and may be, for example, a polygonal tube. A partition wall may be provided at one end of the hollow bodies 9 or inside the hollow bodies 9, as long as the hollow body connecting wire 11 can be inserted therethrough. Although the example shows the hollow body connecting wire 11 being inserted axially through the hollow bodies 9, the method of connecting the hollow body connecting wire 11 to the hollow bodies 9 is not particularly limited. All of the hollow bodies 9 may be connected and integrated with a single hollow body connecting wire 11, or multiple hollow bodies 9 may be divided into several groups, and each group may be connected with a hollow body connecting wire 11.

[0047] 2, when the hollow bodies 9 are filled in the cage body 5, the tip ends of the hollow body connecting wires 11 are arranged so as to be exposed on the upper surface of the cage body 5. For example, the tip ends of the hollow body connecting wires 11 may be temporarily fixed to the upper part of the cage body 5, etc.

[0048] The hollow bodies 9 may all be the same size, or a mixture of different sizes (length or diameter) may be used. By mixing hollow bodies 9 of different sizes, such as lengths and diameters, it is possible to provide habitats suitable for different types and sizes of living organisms. In this case, the size and arrangement of the hollow bodies 9 should be considered so that adjacent hollow bodies 9 do not fit into each other (for example, so that a small-diameter hollow body 9 does not get inside a large-diameter hollow body 9). The hollow bodies 9 may be connected by different wires 11 for connecting the hollow bodies according to their sizes.

[0049] It is desirable that the porosity, which is the total volume of the internal space of the hollow bodies 9 and the space between the hollow bodies 9 relative to the internal volume of the cage body 5, be 50% or more. If the porosity is less than 50%, there is a risk that sufficient oxygen will not reach the inside of the cage body 5 in the water, and this will cause an increase in weight. Note that the porosity can be calculated by calculating the internal volume from the internal dimensions of the cage body 5, subtracting the total volume obtained by multiplying the volume per hollow body 9 (which can be calculated from the specific gravity and mass of the material) by the number of hollow bodies 9 from the internal volume of the cage body 5 to calculate the total spatial volume, and then dividing this by the internal volume of the cage body 5.

[0050] The mesh of the cage body 5 is large enough to hold the hollow body 9. When the covering material 3 is a moji net, the mesh of the moji net is finer than the mesh of the cage body 5 and is large enough to capture the target organisms.

[0051] Next, a method for installing the biological habitat structure 1 underwater will be described. First, as shown in Figure 6, the biological habitat structure 1 is hung from above the water by the cage body lifting wire 17 and installed on the water bottom 23. At this time, as mentioned above, the covering material 3 is lowered below the cage body 5 and temporarily fixed in place. Because the hollow body 9 is lightweight, the hanging work can be done manually without using a lifting machine such as a crane. Note that the covering material lifting wire 15 is fixed above the water separately from the cage body lifting wire 17, because the temporary fixation mentioned above will be released if tension is applied to it.

[0052] FIG. 6(b) is a diagram showing a fishing reef structure 25 in which the habitat structure 1 is installed underwater. In the fishing reef structure 25, the habitat structure 1 is installed on the water bottom 23. As described above, the covering material 3 is lowered below the cage body 5, and the sides of the cage body 5 are exposed. Therefore, fish and shellfish can enter the cage body 5 through the openings in the cage body 5 or the mesh on the sides (or openings formed by cutting part of the mesh) and use the inside of the hollow bodies 9 or the spaces between the hollow bodies 9 as habitats. Note that the cage body hoisting wire 17 and a portion of the covering material hoisting wire 15 are placed above the water and fixed to a pier, buoy, or the like.

[0053] Next, a method for lifting the biohabitat structure 1 from the water for a fishing reef structure 25 in which the biohabitat structure 1 is placed underwater will be described. First, as shown in FIG. 7(a), with the cage body 5 placed on the water bottom 23, the coating material lifting wire 15 is lifted from the water. This lifts the coating material 3, and as shown in FIG. 7(b), the sides of the cage body 5 can be covered with the coating material 3. At this time, the overall height of the coating material 3 is higher than the overall height of the cage body 5, and the sides of the cage body 5 are completely covered with the coating material 3. Furthermore, as mentioned above, the mesh of the coating material 3 is sufficiently smaller than the mesh of the cage body 5, so that the seafood inside the cage body 5 can be covered with the coating material 3.

[0054] Next, as shown in Figure 8(a), with the sides of the cage body 5 covered with the covering material 3, the cage body lifting wire 17 is pulled up above the water, and the cage body 5 is pulled up close to the water surface. For example, the biological habitat structure 1 is pulled up until the top ends of the cage body 5 and the covering material 3 are above the water.

[0055] Next, as shown in Figure 8(b), the hollow body 9 is removed from inside the cage body 5. At this time, the hollow body connecting wire 11 can be easily pulled up because it is exposed on the top surface of the cage body 5. Note that by pulling up the hollow body 9 using the hollow body connecting wire 11, the hollow body 9 is pulled up with its opening facing in a substantially vertical direction, and therefore the seafood inside falls into the cage body 5 (covering material 3).

[0056] In the illustrated example, the cage lifting wire 17 is fixed above the water and the work is performed with the biological habitat structure 1 suspended above the water surface, but this is not limited to this. For example, with the hollow body 9 filled, the entire biological habitat structure 1 may be lifted above the water, and then the hollow body 9 may be removed from the cage body 5.

[0057] Finally, as shown in Figure 9, the living organisms such as fish and shellfish are collected from inside the cage body 5 (covering material 3) after the hollow body 9 has been removed. In this way, the living organisms such as fish and shellfish that have taken up residence in the biological habitat structure 1 can be captured, and their types and numbers can be determined.

[0058] According to the first embodiment, the cage body 5 is filled with a lightweight hollow body 9, so that installation and recovery work can be done manually. This allows work to be easily done even on a pier or the like where a crane or the like cannot be used. Furthermore, installation can be done regardless of the water depth. Furthermore, periodic observations can be easily performed.

[0059] Furthermore, since at least some of the hollow bodies 9 are connected to one another by the hollow body connecting wires 11, it is easy to remove the hollow bodies 9 from inside the cage body 5. In particular, if all of the hollow bodies 9 are connected together by the hollow body connecting wires 11, all of the hollow bodies 9 can be removed together. Furthermore, since the hollow bodies 9 are filled, they have a higher porosity than stone and are less likely to form low-oxygen areas, making them suitable for providing hiding places for a variety of organisms.

[0060] Furthermore, by fixing the upper frame member 13 to the top of the covering material 3, the shape of the opening at the top of the covering material 3 is maintained. Therefore, when the covering material 3 is pulled up, it is prevented from getting caught on the cage body 5, and the covering material 3 can be pulled up so as to more reliably cover the side surface of the cage body 5.

[0061] In addition, since the covering material 3 is temporarily fixed in a state where it is lowered below the cage body 5, it is possible to prevent the covering material 3 from unintentionally rolling up during installation and blocking the side of the cage body 5. Furthermore, when the covering material 3 is pulled up, the temporary fixing is released, so the side of the cage body 5 can be easily covered with the covering material 3 from above water.

[0062] Furthermore, by placing the mat 7 at the bottom of the cage body 5, sand and the like on the bottom 23 of the water can be prevented from being stirred up and entering the inside of the cage body 5, and the hollow body 9 can be prevented from being buried in the bottom 23 of the water.

[0063] In this way, the fishing reef structure 25 can efficiently capture organisms that live on the water bottom. When installing the biological habitat structure 1 on the water bottom 23, anchors 27 may be provided at the bottom, as in the biological habitat structure 1a shown in Figure 10(a), to prevent the biological habitat structure 1 from being washed away. Instead of anchors 27, piles may be driven into the water bottom 23 and the biological habitat structure may be fixed to the piles.

[0064] 10(b), a weight 29 may be placed at the bottom of the cage body 5. In this case, by connecting a weight wire 31 to the weight 29 and pulling it out upward, the weight 29 can be first pulled out of the water to reduce its weight before the cage body 5 is pulled out of the water.

[0065] Furthermore, although the fishing reef structure 25 described above is intended for fish and shellfish that live near the water bottom 23, the present invention is not limited to this. For example, the fishing reef structure 25a shown in Fig. 11 has the biological habitat structure 1 suspended in the water with the biological habitat structure 1 spaced apart from the water bottom 23. In other words, the cage body 5 is not installed on the water bottom 23 but is kept floating in the water. In this case, the wire 17 for lifting the cage body and a portion of the wire 15 for lifting the covering material are placed above the water, and the wire 17 for lifting the cage body is fixed to a structure above the water.

[0066] In the fishing reef structure 25a, the covering material 3 is also lowered below the cage body 5, so that fish and shellfish can enter the cage body 5 from the side. By pulling up the covering material 3 from this state, the fish and shellfish inside can be captured. At this time, because the upper frame material 13 is fixed to the top of the covering material 3, the covering material 3 can be pulled up quickly to cover the cage body 5 without getting caught on it.

[0067] As such, because the biological habitat structure 1 is lightweight, it can be not only installed on the bottom 23 of the water, but also kept floating in the water, making it possible to target fish and shellfish that live in the upper and middle layers of the water other than the bottom.

[0068] In the above-described embodiments, the habitat structure is installed underwater and the habitat structure is a fishing reef, but this is not limiting. For example, the habitat structure 1 may be installed on the ground 23a below a structure such as a pier, as in the habitat structure 25b shown in FIG. 12(a). Also, the habitat structure 1 may be installed on the ground 23a below a cliff, as in the habitat structure 25c shown in FIG. 12(b). Furthermore, the habitat structure 1 may be installed on a plain or the like, or may be used as a habitat for organisms on land.

[0069] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the technical ideas disclosed in this application, and it is understood that these modifications and alterations also fall within the technical scope of the present invention.

[0070] For example, when filling a large number of hollow bodies 9 into a cage body 5, the hollow bodies 9 may be randomly arranged inside the cage body 5, or the hollow bodies 9 may be stacked in a certain direction, for example, so that the openings are facing approximately horizontally.

[0071] Furthermore, although an example has been shown in which the top surface of the cage body 5 is open, the top surface of the cage body 5 may be covered with a lid. The lid is made up of, for example, a mesh body that constitutes the cage body 5. In this case, the lid of the cage body 5 may be openable and closable from above. For example, only a portion of the lid may be connected to the cage body 5 to form a hinge portion, and the lid can be opened from above by pulling up a wire for opening the lid. [Explanation of symbols]

[0072] 1, 1a, 1b……biological habitat structure 3……Coating material 5……Cage body 7. Matt 9……Hollow body 11……Wire rod for connecting hollow bodies 13……Top frame material 15....Wire rod for pulling up coating material 17....Wire rod for lifting cage body 19……hole 21……Fixed part 23……Underwater 23a……ground 25, 25a……Fishing reef structure 25b, 25c……biological habitat structure 27...Anchor 29…… Weight 31……Wire rod for weight

Claims

1. 1. A habitat structure comprising: The cage body and a hollow body filled inside the cage body; a water-permeable covering material capable of covering the bottom and sides of the cage; Equipped with A biological habitat structure characterized in that a plurality of the hollow bodies are connected by wires for connecting the hollow bodies.

2. 2. The biological habitat structure according to claim 1, wherein the hollow bodies can be removed from the cage body all at once by pulling up the hollow body connecting wire.

3. 2. The biological habitat structure according to claim 1, wherein the hollow bodies are a mixture of a plurality of types with different lengths or diameters.

4. 2. The biological habitat structure according to claim 1, wherein the hollow body is substantially cylindrical and has holes formed on the side surfaces thereof that communicate with the internal space.

5. 2. The organism habitat structure according to claim 1, wherein the covering material is a moji net with finer mesh than the mesh of the cage body.

6. The covering material is lowered below the cage body and temporarily fixed thereto, 2. The biological habitat structure according to claim 1, wherein the temporary fixation is released by pulling up the covering material, thereby covering the sides of the cage body.

7. An upper frame material is fixed above the covering material, A wire for pulling up the coating material is connected to the upper frame member, 7. The biological habitat structure according to claim 6, wherein the sides of the cage body can be covered with the covering material by pulling up the covering material pulling wire.

8. 2. The biological habitat structure according to claim 1, wherein the porosity, which is the total volume of the internal space of the hollow bodies and the space between the hollow bodies relative to the internal volume of the cage body, is 50% or more.

9. A habitat structure in which the habitat structure according to any one of claims 1 to 8 is installed in water, A biological habitat structure characterized in that the biological habitat structure is installed on the bottom of the water, and a wire for pulling up the cage body and a portion of the wire for pulling up the covering material are positioned above the water.

10. A habitat structure in which the habitat structure according to any one of claims 1 to 8 is installed in water, A biological habitat structure characterized in that the biological habitat structure is suspended in water away from the bottom of the water, and a wire for pulling up the cage body and a portion of the wire for pulling up the covering material are positioned above the water.

11. A habitat structure in which the habitat structure according to any one of claims 1 to 8 is installed on the ground, A biological habitat structure characterized in that the biological habitat structure is installed on the ground, and a wire for pulling up the cage body and a part of the wire for pulling up the covering material are arranged above.

12. A method for lifting a habitat structure according to any one of claims 1 to 8, comprising: a step of pulling up the covering material to cover the side surface of the cage body; a step of lifting the cage body upward; removing the hollow body from the inside of the cage body; A method for lifting a habitat structure, comprising:

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