JP5213541B2 - Coral settlement structure, coral settlement method and coral reef breeding method using the same - Google Patents

Description

  The present invention relates to a coral-growing structure for coral-growing, a coral-growing method using the same, and a coral reef breeding method. In general, coral grows by growing planula larvae that have hatched after spawning on the seabed and the like. In the present application, corals and their larvae are simply referred to as “corals” without particular distinction.

  Coral reefs, a symbol of abundant nature, have recently been reported to suffer large-scale damage due to bleaching due to rising seawater temperature, etc., and food damage due to the occurrence of large-scaled starfish, the enemy. Therefore, in order to protect the global environment, there is an increasing demand for the restoration of coral reefs damaged in this way.

  In order to regenerate the above-mentioned coral reef, a coral reef breeding method using a settlement base or a net-like structure has been conventionally proposed (for example, see Patent Document 1). This is to cover a wave-dissipating block used as a growth base with a cylindrical or sheet-like network structure, and to protect the corals that have settled on the wave-dissipating block etc. from external enemies such as sea lions and sea urchins. (Fig. 1 of Patent Document 1, etc.), coral is grown on the back surface of the sheet-like network structure, grown to a size that is not easily damaged by external enemies, and then the network structure is inverted to (Claim 4 and FIG. 5 of Patent Document 1).

However, the conventional coral reef breeding method requires a foundation such as a wave-dissipating block, so that there is a problem that the installation is a large-scale construction and the installation cost is high. In addition, when installing a sheet-like network structure, for example, in the case of a rectangular sheet, it is necessary to support at least four corners with a gap between the substrate and other network structures. Therefore, there is a problem that the structure becomes complicated and the manufacturing cost increases.
JP 2007-135511 A

  The present invention relates to a coral-growing structure that is easy to install and inexpensive, by coral growing on the inner surface of a cylindrical body or a cylindrical body having a plurality of opening holes, and a coral-wearing structure using the coral-growing structure. It is intended to provide a live method and a coral reef breeding method.

Coral epiphytic structural body according to claim 1, a coral epiphytic structure for forming a plurality of openings in a portion of the peripheral side wall of the synthetic resin or natural resin tubular body, said opening hole Openings that are formed in a plurality of positions along the circumferential direction of the cylindrical body along the axial direction of the cylindrical body and that are adjacent to each other in the circumferential direction of the cylindrical body. The mutual space | interval of a hole is wider than the mutual space | interval of the opening hole adjacent to the axial direction of a cylinder .

  In the coral-growing structure according to claim 2, the cylindrical body is formed by rolling a sheet body having a plurality of opening holes one or more times and fixing an overlapped part by adhesion, fusion, or a locking tool. It is characterized by being.

The coral-growing structure according to claim 3 is a coral-growing structure in which a peripheral wall of a cylindrical body made of synthetic resin or natural resin is constituted by a net body, and the net body is an axis of the cylindrical body. The warp yarns along the direction intersect with the weft yarns along the circumferential direction, and the circumferential width of the warp yarns is wider than the axial width of the weft yarns .

The coral-growing structure according to claim 4 is characterized in that the inner surface of the warp is an uneven surface .

  In the coral-growing structure according to claim 5, the cylindrical body is obtained by rolling a sheet-like net body one or more times and fixing an overlapped part by adhesion, fusion, or a locking tool. It is characterized by that.

According to a sixth aspect of the present invention, there is provided a coral reef breeding method comprising installing the coral-growing structure according to any one of the first to fifth aspects in the sea and causing the coral to grow on the inner surface of the peripheral side wall. The raw structure is cut at a plurality of locations along at least the axial direction of the cylinder and separated into a plurality of sheets or nets, or the rolled cylinder is unfastened and expanded and further cut. The sheet is separated into a plurality of sheets or nets, and the coral reef is cultivated by installing the separated sheets or nets in the sea with the inner surface of the cylinder as the front side. .

According to a seventh aspect of the present invention, there is provided a coral reef breeding method comprising installing the coral-growing structure according to any one of the first to fifth aspects in the sea and causing the coral to grow on the inner surface of the peripheral side wall. The raw structural body is cut at one place along the axial direction of the cylindrical body and developed into a sheet body or a net body, or the rounded cylindrical body is removed and developed into the sheet body or net body, A coral reef is nurtured by installing the sheet or net thus developed in the sea with the side that was the inner surface of the cylinder as the front.

According to the first aspect of the present invention, the coral can be caused to grow on the peripheral side wall by installing the cylindrical body in the sea, and the coral grown on the inner surface of the peripheral side wall of the cylindrical body You can avoid external enemies that can't get inside, so you can grow without being affected by food damage. In addition, since the cylindrical body has a plurality of opening holes formed not only at the openings at both ends, but also at the peripheral side wall, fresh seawater containing oxygen freely circulates in the cylinder, and sunlight containing ultraviolet rays The coral that radiates evenly in the tube (a light environment that enables photosynthesis of zooxanthellae coexisting with the reef-building coral is ensured), so the coral that has grown on the inner surface of the peripheral side wall of the tube must be cultivated reliably. Can do. Furthermore, since the cylindrical body is made of synthetic resin or natural resin, it is easy and inexpensive to manufacture, is lightweight and easy to handle, and increases the degree of freedom in selecting a material that does not burden the environment. And if a cylinder is cut | disconnected along the some opening hole located in a line in the axial direction, this cylinder can be easily divided | segmented in the several position along the circumferential direction. After the coral that has grown on the inner surface of the peripheral side wall has grown sufficiently, this cylinder can be cultivated as a coral reef by dividing it in this way and placing it again in the sea with the inner side facing up. it can.

  According to invention of Claim 2, since a sheet | seat body is rounded and it is set as a cylinder, manufacture becomes still easier compared with the case where it shape | molds directly to a cylinder.

According to the invention of claim 3 , corals can be caused to grow on the peripheral side wall of the net body by installing the cylindrical body in the sea, and the coral that has grown on the inner surface of the peripheral side wall of the cylindrical body Since it is possible to avoid a foreign enemy of a size that cannot enter the inside of the cylinder, it can be nurtured without being affected by food damage. In addition to the openings at both ends of the cylinder, fresh seawater containing oxygen freely circulates in the cylinder not only through the numerous meshes on the peripheral side wall of the net, but also sunlight containing ultraviolet rays enters the cylinder. Since it is irradiated evenly (light environment enabling photosynthesis of zooxanthellae symbiotic to reef-building corals is ensured), corals grown on the inner surface of the peripheral side wall of the cylinder can be reliably grown. Furthermore, since the cylindrical body is made of synthetic resin or natural resin, it is easy and inexpensive to manufacture, is lightweight and easy to handle, and increases the degree of freedom in selecting a material that does not burden the environment. And if a narrow weft is cut along between each wide warp, this cylinder can be easily divided for every wide warp. After the coral grown on the inner surface of the peripheral side wall is sufficiently grown, the cylindrical body is divided into wide warp yarns as described above, and then each warp yarn is placed again in the sea with the inner surface as the front side. Therefore, it can be raised as a coral reef.

  According to the invention of claim 5, since the sheet-like net is rounded to form a cylindrical body, the manufacturing is further facilitated as compared with the case of directly forming the cylindrical body.

According to invention of Claim 4 , since the inner surface of the warp yarn of a net | network becomes an uneven surface, it becomes easy to grow coral. When the coral that has grown is sufficiently grown, the tube is placed in the sea again with the inner side of the warp of the mesh face up, and is cultivated as a coral reef. Then, it can raise effectively. In this cylinder, at least the inner surface of the warp yarn of the mesh body only needs to be an uneven surface. Therefore, it is not excluded that the inner surface of the weft yarn, the outer surface of the warp yarn and the weft yarn, or the like becomes an uneven surface for the convenience of production.

In the present invention, the inner surface of the peripheral side wall of the cylindrical body when is irregular surface, coral tends to settlement. When the coral that has grown is sufficiently grown, this cylinder is installed again in the sea with the side that was the inner surface of the peripheral side facing up, and is grown as a coral reef. Then, it can raise effectively. In addition, since this cylindrical body should just be an uneven surface at least on the inner surface of a surrounding side wall, it does not exclude that it becomes an uneven surface to the outer surface etc. of a surrounding side wall on account of manufacture.

Further, the synthetic resin tubular body is present Nde contains a calcium compound, it is possible to promote the growth of coral.

When the tubular body is in shall such biodegradable polymers, because the decomposition disappear harmlessly state over the years, there is no possibility to apply an unnecessary burden on the environment.

Moreover , the burden added to an environment can be reduced as a cylinder is a product made from vegetable or animal natural resin.

According to the invention of claim 6 , coral can be caused to grow on the peripheral side wall of the cylindrical body by installing the coral-generating structure in the sea such as the seabed, and on the inner surface of the peripheral side wall of the cylindrical body. The settled coral can avoid an external enemy of a size that cannot enter the inside of the cylindrical body, so that it can be nurtured without being affected by damage. Then, the coral-growing structure is separated into a plurality of sheets or nets, and the coral is cultivated without being affected by food damage while avoiding external enemies that cannot enter the interior of the cylinder. In other words, the coral reef can be effectively cultivated because it is installed in the sea such as the seabed with the side that was the inner surface of the cylindrical body as the front.

According to the invention of claim 7 , coral can be caused to grow on the peripheral side wall of the cylindrical body by installing the coral-generating structure in the sea such as the seabed, and on the inner surface of the peripheral side wall of the cylindrical body. The settled coral can avoid an external enemy of a size that cannot enter the inside of the cylindrical body, so that it can be nurtured without being affected by damage. Then, this coral settlement structure is developed into a sheet body or a net body, avoiding external enemies of a size that cannot enter the inside of the cylinder body, that is, the side on which the corals are grown without being affected by food damage, The coral reef can be effectively cultivated because it is installed in the sea, such as the sea floor, with the side that was the inner surface of the cylindrical body facing up.

  Hereinafter, the best embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, as shown in FIG. 1, a coral-growing structure in which a peripheral wall of a cylindrical body is constituted by a net, and a coral-growing method and a coral reef breeding method using the structure will be described.

  This coral-growing structure is made of a synthetic resin cylinder 1, and the peripheral side wall of the cylinder 1 is constituted by a net body in which a wide warp 2 and a narrow weft 3 are crossed. Yes. The warp 2 is an elongated rectangular thin plate-like portion arranged along the axial direction of the cylinder 1, and the weft 3 is a thin rod-like portion arranged annularly along the circumferential direction of the cylinder 1. . Therefore, the circumferential width of the warp yarn 2 is sufficiently larger than the axial width of the weft yarn 3. These warp yarns 2 and weft yarns 3 cross each other to form a net body and constitute a peripheral side wall of the cylindrical body 1. In the coral-growth structure according to this embodiment, a case where the cylindrical body 1 is configured only by the peripheral side wall of the net body is shown.

  The mesh body uses warp yarns 2 and weft yarns 3 formed separately, respectively, and the original net structure is formed by appropriately crossing the weft yarns 3 alternately inside and outside the plurality of warp yarns 2 arranged in a cylindrical shape. You can also However, in the present embodiment, since the cylindrical body 1 is integrally molded, the synthetic resin molded product that is integrally molded is also a net-like shape that is constituted only by the warp yarn 2 portion and the weft yarn 3 portion. Indicates.

  In the present embodiment, the warp yarn 2 and the weft yarn 3 are arranged on the same circumference of the cylindrical body 1 and the intersection portion is completely shared by the warp yarn 2 and the weft yarn 3. 3 may be arranged slightly closer to the outer circumference or the inner circumference than the warp yarn 2 or may be arranged adjacent to the outer circumference side or the inner circumference side of the warp yarn 2.

  As will be described later, the warp 2 is separated from the cylindrical body 1 and installed on the seabed, so that it is desirable that the warp 2 has a flat thin plate shape along the seabed. Therefore, also in this embodiment, as shown in FIG. 1 (b), the warp yarn 2 is a flat thin plate shape, whereas the weft yarn 3 connecting the warp yarns 2 is a bar shape curved in an arc shape. Therefore, the cylinder 1 is not an exact cylinder. If the weft 3 is a rod that connects the warp yarns 2 in a straight line, the cylinder 1 is a polygonal tube. If the warp 2 is a thin plate that is curved in an arc like the weft 3, the tube 1 The body 1 has a cylindrical shape.

  Examples of the synthetic resin for the cylindrical body 1 include polyolefins (polyethylene, polypropylene, etc.), biodegradable polymers (lactic acid, starch, copolymer polyester, polybutylene succinate, polycaprolactone, etc., or composites thereof. Polymer) and the like are preferably used. In particular, when a biodegradable polymer is used, it will be decomposed by the time the coral reefs are sufficiently grown after the cylinder 1 is installed on the seabed, and it will be harmlessly dissolved in seawater or settled on the seabed and disappear. The installation of the cylinder 1 eliminates the possibility of placing an unnecessary burden on the environment. In the present embodiment, since the cylindrical body 1 having a complicated structure whose peripheral side wall is constituted by a net is integrally formed, as such a biodegradable polymer, a polybutylene succinate-based polymer having excellent formability by extrusion molding is used. A polymer is optimal.

  It is preferable to add a calcium compound to the synthetic resin of the cylinder 1. This is because coral forms a coral reef skeleton composed mainly of calcium carbonate, and if coral can be taken in from the synthetic resin of the tubular body 1, coral growth can be promoted. As the calcium compound to be added to the synthetic resin, calcium carbonate, calcium phosphate, calcium sulfide, or the like can be used, but calcium carbonate is most preferable in view of the influence on the environment. Such a calcium compound needs to be added in an amount of 5% or more in order to exert an effect on coral growth, but if it is too much, the molded article of the synthetic resin becomes brittle and the risk of breakage increases. Addition should be kept below 70%.

  The inner surface of the warp 2 of the cylindrical body 1 is preferably an uneven surface. This is because if the surface is uneven, the surface area becomes large so that corals are easily formed. This uneven surface may be provided with a large number of convex portions and / or concave portions, or may be provided with a large number of convex strips and / or concave strips, or may be an uneven surface formed by embossing or the like. Such a concavo-convex surface may be formed by molding by providing a concavo-convex surface in the mold, or the concavo-convex surface may be formed by additional machining after molding. Moreover, in the case of this embodiment, the synthetic resin of the cylinder 1 is made into a foam, so that the inner surface of the warp 2 becomes an uneven surface by foaming. In this case, it is possible that only the inner surface of the warp yarn 2 becomes an uneven surface by foaming. However, in the case of this embodiment, the synthetic resin of the cylindrical body 1 is used for ease of manufacture. Since all the foams are used, actually, not only the inner surface of the warp yarn 2 but also the outer surface of the warp yarn 2 and the inner and outer surfaces of the weft yarn 3 are also uneven surfaces.

  Both ends of the cylindrical body 1 in the axial direction are open in the present embodiment, but a lid (not shown) may be attached and closed in order to reliably prevent entry of an external enemy. The lid is preferably made of a mesh body or a large number of openings so that seawater and sunlight can pass through. Since most of them pass through a mesh, they may be free of seawater or sunlight. Moreover, it is preferable to attach this lid so that it can be easily removed so as not to obstruct the operation when separating the warp yarn 2 from the cylindrical body 1.

  The cylinder 1 of the present embodiment has a diameter of about 100 mm and a length of about 1000 mm. In FIG. 1, in order to make the drawing easier to see, the length is shortened compared to the diameter. The diameter of the cylindrical body 1 is preferably 50 mm or more in order to secure a sufficient space for the coral to grow. If this diameter is too large, not only sea urchin starfish but also external enemies such as sea urchins and fish are inside. It is preferable to set the thickness to 300 mm or less because there is a risk that it may intrude into the body and suffer damage from damage to food. However, when the lids are attached to both ends of the cylinder 1, the diameter of the cylinder 1 can be further increased because there is no risk of entry of an external enemy.

  In the cylindrical body 1 of the present embodiment, the circumferential width of the warp yarns 2 is about 10 mm, and the circumferential interval between the warp yarns 2 is also about 10 mm. In FIG. 1, only six warp yarns 2 are arranged along the circumferential direction in order to make the drawing easy to see, but actually, the circumferential length of the cylindrical body 1 is about 314 mm (= 100 × Therefore, 15 to 16 warps 2 (314 ÷ 20 = 15.7) are arranged along the circumferential direction. Further, the weft 3 has a round bar shape with a diameter of 2 to 3 mm, and an axial width of 2 to 3 mm. Accordingly, the opening ratio of the mesh body on the peripheral side wall of the cylindrical body 1 is almost 50% because the axial width of the weft 3 can be almost ignored and the warps 2 are arranged at the same interval as the circumferential width.

  The width in the circumferential direction of the warp yarn 2 should be less than ½ of the circumferential length of the weft yarn 3 (the length of the entire circumference of the cylindrical body 1). When the warp 2 is a flat belt-like shape, at least two warp yarns 2 are required to form the cylindrical body 1, and a gap is required between the two warp yarns 2. This is because the circumferential width of the warp yarn 2 is narrower than ½ of the circumferential length of the weft yarn 3. As shown in FIG. 2, the cylindrical body 1 in the case where there are two warp yarns 2 is substantially a square cylindrical shape. In practice, the circumferential width of the warp yarn 2 is suitably ¼ or less and 1/40 or more of the circumferential length of the weft yarn 3. The reason why the length of the weft yarn 3 is 1/4 or less is to increase the opening ratio by widening the interval between the warp yarns 2, and the reason why the width is 1/40 or more is that the circumferential width of the warp yarn 2 is too large. This is because if it is narrow, a sufficient number of corals cannot be grown. In the case of the present embodiment, the length of the weft 3 is about 314 mm, and the circumferential width of the warp 2 is about 10 mm, so this ratio is a little less than 1/30.

  The width in the axial direction of the weft 3 is 0.5 mm or more and 30 mm in order to ensure the strength for maintaining the cylindrical body 1 and for ease of cutting with a rivet or the like when separating the warp 2. The following are appropriate. Moreover, it is preferable that the opening ratio of the net body on the peripheral side wall of the cylindrical body 1 is 10% or more so that seawater or sunlight passes sufficiently, and is 50% or less in order to secure an area where the coral lands. It is preferable.

  A coral growth method using the coral growth structure having the above structure will be described. This coral settlement structure is installed on the sea floor using a U-shaped anchor. The installation location is, for example, in the vicinity of a coral reef that has been damaged by a cormorant. Also, the seabed into which the anchor is driven is preferably sand. This is because in the case of a rocky place, when an anchor or the like is driven, the rock is damaged and the natural state may be greatly impaired.

  In addition, the installation of the coral-growth structure is not limited to the U-shaped anchor, and an anchor having another shape or an installation tool other than the anchor may be used. In the present embodiment, a metal anchor is used, but any material may be used for the anchor and other installation tools as long as there is no risk of polluting the environment. In particular, when a biodegradable material is used, the burden on the environment can be reduced. Furthermore, the installation of the coral-growth structure is not limited to the seabed, and may be installed in the sea a little closer to the sea surface than the seabed, for example, via a structure or the like.

  According to the coral-growing structure and the coral-growing method using the coral-growing structure, the coral can be caused to grow on the inner surface of the warp 2 of the tubular body 1 of the coral-growing structure. In addition, since the inner surface of the warp yarn 2 is an uneven surface, the coral is more likely to settle. And, foreign enemies such as sea starfish, sea urchins, fish, etc. cannot enter the inside of the cylindrical body 1, so that the corals grown on the inner surface of the warp 2 are nurtured without being affected by the food damage caused by these external enemies. . And since the synthetic resin of the cylinder 1 contains a calcium compound, it can promote the growth of coral.

  In addition, the cylinder 1 not only has openings at both ends, but also fresh seawater containing oxygen freely circulates in the cylinder through a large number of meshes between the warp 2 and the weft 3 on the peripheral side wall of the net. Because the sunlight including UV rays is evenly radiated into the tube, and the light environment that enables photosynthesis of the zooxanthellae symbiotic to the reef-building coral is secured, the coral that has grown on the inner surface of the warp 2 is reliably cultivated. be able to.

  Furthermore, since the cylindrical body 1 is made of a synthetic resin, it is easy and inexpensive to manufacture, is lightweight and easy to handle, and it is possible to avoid burdening the environment by using a biodegradable polymer. .

  A coral reef breeding method using a coral-growth structure in which corals are grown by the coral reef breeding method will be described. The structure for coral-growth grows to a size that is less likely to be damaged by external enemies after several years of coral on the inner surface of the warp 2 of the cylinder 1. Therefore, a plurality of wefts 3 between the warp yarns 2 are cut with a scissors or the like along the axial direction of the tube body 1 to separate the tube body 1 for each warp yarn 2. Then, the warp yarns 2 are placed on the seabed again using the U-shaped anchor with the side that was the inner surface of the cylindrical body 1 as the front side.

  The operation of separating the cylindrical body 1 for each warp yarn 2 and the operation of installing these warp yarns 2 on the seabed or the like are usually performed by an operator diving in the sea. At this time, it is only necessary to cut the thin weft 3 along the mesh with a scissors or the like, so that the work becomes easy and the work efficiency can be improved even in the sea. In addition, when lids are attached and closed at both ends of the cylindrical body 1, the cylinder body 1 is separated into warp yarns 2 after the lid is removed. When coral is growing on the inner surface of the removed lid, this lid may be placed on the seabed again. The re-installation location of the warp yarn 2 and the like is preferably in the vicinity of the location where the coral settlement structure is first installed, from the viewpoint of protecting the ecosystem, since the species of coral varies from region to region.

  As in the case of the coral settlement method, the seabed into which the anchor is driven is preferably sandy land, and may be in the sea other than the seabed. Here, when installing the warp 2 with the side that was the inner surface of the cylinder 1 facing up, for example, when installing it on the seabed of a horizontal sand, the side that was the inner surface of the cylinder 1 is set facing upward For example, in the case of installing on a vertical wall such as a rocky place or a structure, it means that the side that was the outer surface of the cylinder 1 is installed facing the wall. Also, in place of the U-shaped anchor, other shapes of anchors or installation tools other than anchors may be used, and these materials, including biodegradable ones, as long as there is no risk of polluting the environment Anything can be used.

  According to the coral reef breeding method, the coral that has grown to a size that is difficult to be damaged by external enemies is placed on the seabed, etc. in a state where it has grown on the warp yarn 2, so that this coral grows further and the coral reef is put on the spot. It will be possible to train. Moreover, since the synthetic resin of the warp yarn 2 contains a calcium compound, the coral can take up the calcium and form a coral reef skeleton, thereby promoting the growth of the coral reef. In addition, by using a biodegradable polymer as the synthetic resin for the warp yarn 2, the warp yarn 2 decomposes and disappears in a harmless state over time, so that it is possible not to place a burden on the environment.

  In the above embodiment, the case where the circumferential width of the warp yarn 2 of the cylindrical body 1 is wider than the axial width of the weft yarn 3 is shown, but conversely the axial width of the weft yarn 3 is the circumferential direction of the warp yarn 2. In this case, the coral is mainly deposited on the inner surface of the weft 3. However, when separating the warp yarn 2, it is necessary to cut the wide weft yarn 3 with a scissors or the like. Further, the width in the circumferential direction of the warp yarn 2 and the width in the axial direction of the weft yarn 3 can be made the same, and the coral can be caused to grow on the entire inner surface of the net body composed of the warp yarn 2 and the weft yarn 3. Furthermore, in the above, the case where the circumferential widths of all the warp yarns 2 are the same and the axial widths of all the weft yarns 3 are the same is shown. However, these are not necessarily the same width, Only the circumferential width of some warp yarns 2 may be wide, and the circumferential widths of other warp yarns 2 may be narrow. Further, the warp yarns 2 and the weft yarns 3 do not have to have the same width over the entire length, and the width may be wide or narrow.

  Moreover, in the said embodiment, although the case where the cylindrical body 1 of the structure for coral-growth was isolate | separated for every one warp 2 was shown, the 2 or more warp 2 can also be isolate | separated as one. In this case, two or more warp yarns 2 are integrated with each other without cutting the weft yarn 3 between them.

  Moreover, in the said embodiment, although the case where the mesh body which crossed the warp yarn 2 along the axial direction of the cylinder 1 and the weft 3 along the circumferential direction was used was shown, the structure of this mesh body is arbitrary. For example, the mesh is not limited to a square, but may be a parallelogram or a polygon.

  Moreover, in the said embodiment, although the case where the surrounding side wall of the cylinder 1 was comprised with the net body was shown, as shown in FIG. 3, the some opening hole 4 is formed in a part of surrounding wall of the cylinder 1 You can also Also in this case, the plurality of opening holes 4 can pass seawater or sunlight instead of the mesh of the mesh body. Moreover, as shown in FIG. 3, if a plurality of opening holes 4 are formed side by side along the axial direction of the cylindrical body 1, the peripheral side wall of the cylindrical body 1 is cut by cutting with a scissors or the like along these opening holes 4. Can be easily cut. Then, if a plurality of opening holes 4 arranged along the axial direction of the cylindrical body 1 are formed at a plurality of positions along the circumferential direction of the cylindrical body 1 (in the case of FIG. 3, along the circumferential direction). By cutting each of the plurality of opening holes 4 arranged along the axial direction of the cylindrical body 1, the peripheral side wall of the cylindrical body 1 can be divided into a plurality of positions. Although FIG. 3 shows the case where the opening hole 4 is a round hole, this hole shape is arbitrary and may be a rectangle. By the way, in the case of the cylindrical body 1 shown in FIG. 1, it may be interpreted that a plurality of rectangular opening holes 4 are formed on the peripheral side wall, instead of interpreting as a mesh body in which the warp 2 and the weft 3 intersect. it can. In addition, it is preferable that the opening rate of the surrounding side wall of the cylinder 1 by the some opening hole 4 is 10 to 50% as mentioned above.

  Moreover, in the said embodiment, although the case where the cylinder 1 was produced by integral molding of a synthetic resin was shown, a sheet-like net body and a sheet body having a plurality of opening holes 4 are rounded and stopped one or more times. Thus, the cylindrical body 1 can also be produced. A sheet-like net or sheet is fastened by bonding, fusing, or a locking tool.

  Moreover, in the said embodiment, although the case where the cylinder 1 was made from a synthetic resin was shown, this cylinder 1 may be made from a natural resin. This natural resin is preferably rosin, Canadian balsam, sandalac, gutta percha, or chicle as a vegetable natural resin, and shellac or the like as an animal natural resin.

  Moreover, in the said embodiment, although the case where the cylinder 1 was isolate | separated into two or more was shown, it expand | deployed to a sheet | seat body or a net | network body by cut | disconnecting at one place along an axial direction, or the cylindrical body 1 rounded off It is also possible to install the sheet that has been unfastened and developed into a sheet body or a net body on the seabed or the like with the side that was the inner surface of the cylindrical body 1 as the front. Further, if the locking tool for fastening the rounded cylindrical body 1 is made biodegradable, the locking tool will be disassembled and disappeared after an appropriate period of time. Since it expands naturally in the installed state, there is no need to perform cutting or the like by a coral reef breeding method or re-installation work.

1 shows an embodiment of the present invention, and is a side view (a) and a front view (b) showing a coral-growing structure in which a peripheral wall of a cylindrical body is constituted by a net. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view (a) and a front view (b) illustrating a coral-growing structure according to an embodiment of the present invention, in which a cylindrical body has two warp threads. The side view (a) and front view (b) which show one Embodiment of this invention, Comprising: The structure for coral growth in which the some opening hole was formed in a part of peripheral wall of a cylinder is there.

Explanation of symbols

1 cylinder 2 warp 3 weft 4 opening hole

Claims (7)

A coral-growing structure in which a plurality of opening holes are formed in a part of a peripheral wall of a cylindrical body made of synthetic resin or natural resin , wherein the opening hole is a periphery of the cylindrical body on the peripheral side wall of the cylindrical body. Are formed in a plurality of positions along the direction along the axial direction of the cylinder, and the interval between the opening holes adjacent in the circumferential direction of the cylinder is in the axial direction of the cylinder. A coral-growing structure characterized by being wider than the interval between adjacent opening holes .   2. The cylindrical body according to claim 1, wherein the cylindrical body is formed by rolling a sheet body having a plurality of opening holes one or more times, and fixing an overlapped part by adhesion, fusion, or a locking tool. The structure for coral settlement described. A coral-growing structure in which a peripheral wall of a cylindrical body made of synthetic resin or natural resin is constituted by a mesh body, wherein the mesh body has warp yarns along the axial direction of the cylindrical body and weft yarns along the circumferential direction And a width of the warp in the circumferential direction is wider than the width of the weft in the axial direction . The coral-growing structure according to claim 3 , wherein an inner surface of the warp is an uneven surface. 5. The cylindrical body according to claim 3 or 4 , wherein the cylindrical body is obtained by rolling a sheet-like net body one or more times and fixing an overlapped part by adhesion, fusion, or a locking tool. The structure for coral growth described in 1. The coral-growing structure according to any one of claims 1 to 5 is installed in the sea, and coral is caused to grow on the inner surface of the peripheral side wall. The coral-growing structure is at least a cylindrical body. The sheet is cut into a plurality of sheets or nets at a plurality of locations along the axial direction of the sheet, or separated into a plurality of sheets or nets, or unrolled and unrolled and further cut into a plurality of sheets or nets. A coral reef cultivating method comprising cultivating a coral reef by separating and placing the separated sheet body or net body in the sea with the side that was the inner surface of the cylindrical body as a front side. The coral-growing structure according to any one of claims 1 to 5 is installed in the sea, and coral is caused to grow on the inner surface of the peripheral side wall . Cut at one point along the axial direction and develop into a sheet or net, or unroll the rounded cylinder and deploy into a sheet or net, and thus develop the sheet or net A coral reef cultivating method comprising cultivating a coral reef by placing the body in the sea with the side that was the inner surface of the cylinder facing the front.

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