JP2005348659A - Artificial fish reef - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To grow abalones, or the like, while safely protecting the abalones, or the like, from foreign enemies by simply providing settling gaps preferred by the abalones, or the like, greatly growing from spats. <P>SOLUTION: The subject artificial fish reef is obtained by laminating a plurality of fish reef bodies 1 formed from concrete. The plurality of fish reef bodies 1 are mutually laminated and connected to provide living gaps 2 for fishes and shellfishes between the upper and the lower fish reef bodies 1. Furthermore, the fish reef bodies 1 are provided with one or both of opposite surfaces 4 of the living gaps 2 formed into slopes and a plurality of leg parts 5 so that the vertical interval of the living gaps 2 is changed in the horizontal direction. Further, the artificial fish reef is prepared by laminating the plurality of fish reef bodies 1 so that the tips of the leg parts 5 of the mutually laminated fish reef bodies 1 contact the opposite surfaces 4 of the opposite fish reef bodies 1 and forming the living gaps 2 changing the vertical interval in the horizontal direction with the undersurface of the fish reef body 1 in the upper stage and the top surface of the fish reef body 1 in the lower stage. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an artificial reef that is most suitable for breeding and capturing shellfish such as abalone and turban shell.

  Seafood such as abalone and tuna fish have been released after the release of juvenile shellfish to the rocks, and have been caught for one and a half years. About 10% of the larvae released are captured in a favorable environment. For example, 200,000 abalone larvae are released into the sea, and about 20,000 are captured. However, it is not possible to release 400,000 larvae into the same sea area and capture 40,000. This is because the number of abalone grown on the environment where the released larvae can grow is limited. Abalone and Sazae grow on seaweeds such as arame and swordfish. For this reason, the number of abalone and turban shell that can grow the seaweed breeding state is limited.

Furthermore, it is important that the artificial reef that grows the released larvae has an environment in which abalone and the like prefer to live. Abalone is known to settle in the gap between its shell heights. Abalones who prefer to settle in narrow gaps come out of the gaps at night and eat seaweed to grow. In addition, it is important for artificial reefs to protect abalone growing in the gap from external enemies. An artificial reef that realizes this needs to have a gap corresponding to the height of the abalone shell. Artificial fishing reefs that are stacked in multiple stages have been developed as artificial fishing reefs that provide gaps (see Patent Documents 1 and 2).
JP 2000-342101 A JP 2000-197426 A

  Artificial fishing reefs described in these publications are stacked in multiple stages, and a gap for growing seafood such as abalone is provided between the upper and lower fishing reefs. In particular, leg portions protruding from the lower surface are provided at the four corners of the fishing reef, and a gap is provided between the leg portions. The fishing reef with this structure can adjust the vertical spacing of the gap at the height at which the legs protrude. For this reason, it is possible to easily and easily produce a fishing reef having a wide and narrow gap with concrete at a low cost. Conventional fishing reefs use molds to form gaps on the surface, but fishing reefs with this structure provide narrow gaps in the molds, which requires time and effort. On the other hand, the structure in which the legs are projected and the gaps are provided between the multi-tiered fishing reefs is not formed by the molds, but the protruding legs are formed to provide the narrow gaps. It can be easily and efficiently manufactured.

  However, since the fishing reef described in the above patent documents provides a gap between the upper and lower fishing reefs at the four corners, the vertical gap of the entire gap is the same. For this reason, there is a drawback that the gap between the top and bottom of the gap cannot be set so that all abalone that have grown greatly from juveniles prefer to settle. In addition, there is a drawback that abalone and the like that live in the gap between the upper and lower fishing reefs cannot be safely protected from external enemies.

  The present invention has been developed for the purpose of solving such drawbacks. An important object of the present invention is to provide an artificial reef that can easily provide a settlement gap that abalone that grows greatly from juveniles and that can grow while safely protecting abalone and the like from external enemies.

  The artificial reef of the present invention is formed by laminating a plurality of reef bodies 1 made of concrete. The plurality of fish reef bodies 1 are stacked and connected to each other, and a seafood habitat 2 is provided between the upper and lower fish reef bodies 1. Furthermore, the reef body 1 is provided with a plurality of leg portions 5 with one or both of the opposing surfaces 4 of the inhabiting gap 2 being inclined surfaces so that the vertical interval of the inhabiting gap 2 changes in the horizontal direction. Yes. The artificial reef is formed by laminating a plurality of reef bodies 1 so that the tips of the legs 5 of the reef bodies 1 stacked on each other are in contact with the opposing surface 4 of the opposing reef body 1. A habitat gap 2 whose vertical distance changes in the horizontal direction is provided on the upper surface of the lower reef body 1.

  The artificial reef of the present invention has a plurality of reef bodies 1 such that the lower surface of the reef body 1 stacked on the upper stage is in contact with the upper surface of the lower reef body 1 with the lower surface of the reef body 1 as an inclined surface. It is possible to provide a habitat gap 2 in which the vertical interval varies in the horizontal direction by laminating and forming an inclined surface on the lower surface of the upper reef body 1 and an upper surface of the lower reef body 1.

  In the artificial reef of the present invention, a connecting hole 7 is provided through the reef body 1 in the vertical direction, and a connecting rod 8 is inserted into the connecting hole 7 so that the upper and lower reef bodies 1 are not displaced in the horizontal direction. can do.

  The artificial reef of the present invention can be provided with a plurality of legs 5 on the outer periphery of the reef body 1. Furthermore, the artificial reef of the present invention can be provided with legs 5 at the four corners of the quadrangle, with the planar shape of the reef body 1 being a quadrangle. Furthermore, the artificial fishing reef of the present invention can be provided with the through hole 6 in the central portion of the planar shape of the fishing reef body 1.

  The artificial reef of the present invention can fix a seaweed breeding block 3 made of porous concrete on the uppermost reef body 1. Furthermore, the artificial reef of the present invention can fix a plurality of seaweed breeding blocks 3 formed in a rectangular parallelepiped on the uppermost reef body 1. Furthermore, the artificial fishing reef of the present invention can fix the quadrangular seagrass breeding block 3 by being arranged vertically and horizontally on the upper surface of the reef main body 1 having a square planar shape.

  In the artificial reef of the present invention, the minimum vertical distance of the habitat gap 2 can be set to 0 to 10 cm. Furthermore, the artificial reef of the present invention can make the maximum vertical interval of the habitat gap 2 wider than the minimum vertical interval and be 7 to 20 cm.

  In the artificial fishing reef of the present invention, the string material 10 in which seaweed is planted on the surface of the seagrass breeding block 3 can be disposed. Furthermore, the artificial fishing reef of the present invention can fix the string material 10 arranged on the surface of the seagrass breeding block 3 with the pressing tool 11 that is fixed to the seagrass breeding block 3.

  The main body of the reef according to claim 1 of the present invention has a feature that it can provide a gap in which shellfish such as abalone having different sizes prefer to settle from young shellfish to abalone that grows greatly. That is, the artificial reef of the present invention has a plurality of reef bodies stacked on top of each other to provide a habitat gap between the upper and lower sides. This is because one or both of the opposing surfaces of the gap are inclined surfaces and a plurality of legs are provided. The artificial reef having this structure can be provided with a habitat gap in which the vertical interval varies in the horizontal direction with the lower surface of the upper reef body and the upper surface of the lower reef body by stacking the reef bodies. According to this structure, it is not necessary to mold and provide the habitat gap with the mold for forming the reef body, and the vertical gap of the habitat gap can be freely set by the height of the legs and the inclined surface that are projected when molding with concrete. Can be adjusted.

  In addition, the artificial reef of claim 1 of the present invention can also realize a feature that allows shellfish such as abalone to be safely protected and grown from external enemies. This is because the gaps can be narrowed and deepened so that shellfish prefer to settle. The narrow and deep habitats make it difficult for shell enemies to invade, and can effectively protect them from enemies.

  Moreover, the artificial reef of claim 3 of the present invention is provided with a connecting hole penetrating through the stacked reef bodies, and connecting the connecting rods to the connecting holes, so that the stacked reef bodies are not displaced laterally. Can be connected firmly. As described above, an artificial fishing reef formed by laminating a plurality of fishing reef bodies is installed on the seabed and can surely prevent the laminating position from being shifted due to a tidal current or a sea current.

  Furthermore, in the artificial fishing reef according to claim 7 of the present invention, the seagrass breeding block made of porous concrete is fixed on the uppermost fishing reef body. It is possible to set up a feeding area for shellfish such as abalone. For this reason, it can be installed on the sea floor without seaweed, and it can realize the advantage that shellfish such as abalone can grow in an ideal environment. In particular, as described in claim 12 of the present invention, an artificial fishing reef in which a seaweed breeding block is connected with a string material in which seaweed is planted has a feature that seagrass can be propagated in a very short time. In the artificial reef of claim 13 of the present invention, the string material is fixed with a pressing tool so that the string material is fixed so as not to be moved by a tide or the like, and the seaweed of the string material is promptly transplanted to the seagrass breeding block. Realize the features you can.

  Embodiments of the present invention will be described below with reference to the drawings. However, the example shown below illustrates the artificial reef for embodying the technical idea of the present invention, and the present invention does not specify the artificial reef as follows.

  Further, in this specification, for easy understanding of the scope of claims, numbers corresponding to the members shown in the embodiments are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The artificial reef shown in FIGS. 1 to 3 has a plurality of reef bodies 1 formed of concrete laminated. The artificial reef in the figure has a seaweed breeding block 3 made of porous concrete fixed on a reef body 1. Since the artificial reef with this structure has the seaweed breeding block 3 fixed, it can breed seaweed on the top surface. However, it is not always necessary to fix the seaweed breeding block on the main body of the reef body in the artificial reef that contacts the seabed where seagrass breeds.

  The artificial fishing reef shown in FIGS. 1 and 2 has a plurality of fishing reef bodies 1 stacked and connected to each other. Between the reef bodies 1 that are stacked one above the other, a habitat gap 2, which is a gap for inhabiting seafood such as abalone, is provided. The habitat gap 2 is provided with a plurality of legs 5 with the opposed surface 4 of the habitat gap 2 as an inclined surface so that the vertical interval changes in the horizontal direction. The artificial reef is formed by laminating a plurality of reef bodies 1 so that the tips of the legs 5 of the reef bodies 1 stacked on each other are in contact with the opposing surface 4 of the opposing reef body 1, and the lower surface of the upper reef body 1. And a habitat gap 2 in which the vertical interval varies in the horizontal direction is provided between the lower reef body 1 and the upper surface. The reef body 1 shown in the figure has a lower surface of the reef body 1 that is one opposing surface 4 as an inclined surface and an upper surface of the reef body 1 that is the other opposing surface 4 as a horizontal surface. The artificial reef has a plurality of reef bodies 1 stacked so that the lower ends of the legs 5 of the reef bodies 1 stacked on the upper stage are in contact with the upper surface of the lower reef body 1. Between the inclined surface and the upper surface of the lower reef body 1, a habitat gap 2 in which the vertical distance changes in the horizontal direction is provided. However, as for the reef body, only the upper surface of the reef body that is one of the opposing surfaces of the habitat gap is inclined, or both the opposite surfaces of the habitat gap, that is, the upper and lower surfaces of the opposite reef body are inclined surfaces. It is also possible to provide a habitat gap in which the vertical interval changes in the horizontal direction.

  The reef body 1 is manufactured by putting ready-mixed concrete in a mold and curing the concrete. The reef main body 1 can easily propagate seaweed on the surface by mixing artificial zeolite with ready-mixed concrete or applying a mortar mixed with artificial zeolite on the surface. The fishing reef body 1 shown in the figure has a quadrilateral planar shape, and legs 5 are provided at the four corners of the quadrangle. However, the artificial reef of the present invention does not specify the planar shape as a quadrangle. The artificial reef can have a planar shape that is not a quadrilateral polygon, a circle, or an ellipse.

  The fishing reef body 1 is stacked vertically and has a living space 2 at the legs 5. Therefore, the fishing reef body 1 is provided with a plurality of legs 5 so that the legs 5 can be stably supported by bringing the legs 5 into contact with the opposing surface 4 of the opposing fishing reef body 1. The fishing reef body 1 shown in the figure has a plurality of legs 5 on the lower surface so that the legs 5 can be placed on the lower fishing reef body 1 and can stably stand by itself. The artificial reef shown in the figure has legs 5 at the four corners, but it can be laminated so that it can stand on its own by providing legs that are continuous on both sides or a plurality of legs around it. Furthermore, as shown in FIG. 3, the structure in which the through-hole 6 that penetrates the reef body 1 up and down is provided, and a single leg portion that is continuous to the periphery can be provided so as to be independent on the lower reef body. .

  Further, the plurality of reef bodies 1 can be stacked with the structure shown in FIG. The artificial reef shown in this figure has a plurality of reef bodies 1 stacked in a state where FIG. 2 is inverted, that is, in a state in which a plurality of legs protrude upward. This artificial fishing reef has a plurality of reef bodies 1 laminated so that the upper ends of the legs 5 of the lower reef body 1 are in contact with the lower surface of the upper reef body 1 and the lower reef body 1 Between the inclined surface of the upper surface and the lower surface of the upper reef body 1, a habitat gap 2 in which the vertical interval changes in the horizontal direction is provided. This artificial fishing reef has a feature that it can be installed in a stable posture while reducing the contact pressure with the sea bottom because the horizontal surface, which is the lower surface of the lowermost fishing reef body 1, can be placed in contact with the sea bottom. In particular, it has the feature that it can be installed stably on the sea floor where the bottom of the sea is sand. Furthermore, although this artificial reef is not shown, it is also possible to fix the seagrass breeding block directly on the upper surface of the uppermost reef body as shown by the chain line in the figure. A support plate 14 may be disposed at the upper end, and the seagrass breeding block 3 may be fixed to the upper surface of the support plate 14.

  The height of the leg 5 determines the vertical interval of the living space 2. The artificial reef in the figure has a shape in which the minimum vertical interval of the habitat gap 2 is 5 cm and the maximum vertical interval is 10 cm, and is inclined downward from the right side to the left side in FIG. However, as for the habitat clearance of the artificial fishing reef, the minimum vertical interval can be 0 to 10 cm, the maximum vertical interval can be wider than the minimum vertical interval, and can be 7 to 20 cm.

  2 has an upper surface as a horizontal surface and a lower surface as an inclined surface. Therefore, the reef body 1 is formed into a shape with a different thickness and has an inclined surface on the lower surface. The reef body 1 in the figure is a quadrilateral with one side of 1000 to 1500 mm, the overall height is 150 to 400 mm, the thickness of the thickest part is 100 to 400 mm, and the thickness of the thinnest part is 50 to 300 mm. .

  However, as shown in FIG. 5, the entire reef body 1 can be formed to have the same thickness, and an inclined surface can be provided on the opposing surface 4 of the living space 2. The reef body 1 having the same thickness is laminated so that the direction in which the vertical gap of the habitat gap 2 changes is opposite to each other. That is, as shown in the figure, in the reef body 1, one of the habitat gaps 2 formed vertically is narrowed from the right side to the left side, and the other is widened from the right side to the left side. Are laminated. This fishing reef body 1 has a total thickness of 50 to 400 mm.

  The fishing reef body 1 shown in the figure is stacked in multiple stages with the same outer shape and the same size. However, the main body of the reef can be made smaller in outer shape than that in the lower layer. Moreover, the external shape of the reef main body laminated | stacked up and down can also be made into a different shape.

  The artificial fishing reef shown in the figure has a through hole 6 penetrating vertically in the center of the fishing reef body 1. This artificial fishing reef has the feature that the outer shape of the reef body 1 can be enlarged to easily capture abalone and the like that settle within the habitat gap 2. A plurality of through holes can be provided in the reef body. An elongated through hole can also be provided.

  Further, the artificial reef of FIGS. 1 to 3 has a connecting hole 7 penetrating vertically through the reef body 1, and a connecting rod 8 is inserted into the connecting hole 7 so that the upper and lower reef bodies 1 are horizontally aligned. It is connected so as not to slip. The artificial fishing reef shown in the figure has a connecting hole 7 penetrating vertically so as to penetrate the leg 5 of the fishing reef body 1 up and down. The artificial reef of this structure can connect the upper and lower fishing reef bodies 1 with a firm and strong structure by bringing the lower end surface of the leg 5 into contact with the upper surface of the lower reef body 1. However, although not shown, the artificial reef of the present invention can be connected by providing a connecting hole in a portion of the main body of the reef without a leg and inserting a connecting rod into the connecting hole.

  The reef body 1 stacked vertically includes the connection holes 7 at positions where the connection holes 7 are arranged in a straight line in the vertical direction. The connecting rod 8 is a metal rod that does not corrode into seawater or a hard plastic rod. The connecting rod 8 has a rod 8A that does not pass through the connecting hole 7 at one end, and a nut 9 is screwed into the other end to connect the reef body 1. The connecting rod 8 is provided with a rod 8A at the lower end and a male screw at the upper end, and a nut 9 is screwed into the connecting rod 8 so that the stacked reef body 1 can be firmly connected. Further, the connecting rod 8 can be bent so that the connecting rod 8 is not pulled out while being inserted into the reef body 1. However, the connecting rod does not necessarily need to be screwed with a nut at the upper end. For example, as shown in FIG. 6, the connecting rod 8, which is a metal rod, is inserted into the connecting hole 7. It is also possible to fill the gap between the mortar 16 and harden it so that the upper and lower reef bodies 1 are connected so as not to be laterally displaced. This is because the concrete and the metal rod are firmly connected by the adhesive force of the mortar 16. The connecting rod 8 has a length that is shorter than the height of the entire reef body that is stacked one above the other, and the upper and lower ends of the connecting rod 8 do not protrude from the upper and lower surfaces of the stacked reef body 1. Can be embedded in

  In order to stack the upper reef body in place, the reef body is provided with a recess on the upper surface for inserting the lower end of the leg of the upper reef body, and the upper and lower reef bodies are in place by guiding the legs into the recess. Can be laminated. However, since the upper and lower fishing reef bodies 1 are connected to the fixed positions by inserting the connecting rods 8 into the connecting holes 7, it is not always necessary to provide the recesses for inserting the legs 5.

  In the artificial fishing reef shown in FIGS. 1 to 3, a plurality of seaweed breeding blocks 3 formed in a rectangular parallelepiped shape are fixed on the upper surface of the uppermost fishing reef body 1. In the illustrated artificial reef, four seaweed breeding blocks 3 are fixed on the upper surface of the uppermost reef body 1. The seagrass breeding block 3 is a cube having one side of 30 cm. However, the seagrass breeding block 3 may be a rectangular parallelepiped having one side of, for example, 5 to 100 cm, preferably 10 to 70 cm, and more preferably 20 to 50 cm. Further, the seagrass breeding block 3 may have a flat bottom surface to be fixed to the reef body 1 and a spherical shape, an elliptical spherical shape, or a random shape of natural stone.

  The seagrass breeding block 3 is a rectangular parallelepiped porous concrete to which artificial zeolite is added. However, the artificial reef of the present invention can fix three or less, or five or more seagrass breeding blocks on the upper surface of the main body of the reef.

  Furthermore, as shown in FIG. 7, the seagrass breeding block 3 arranges the string material 10 in which seaweed is planted on the surface, and can rapidly breed seagrass. This seagrass breeding block 3 can breed the seaweed more quickly by fixing the string material 10 wound around the surface to the seaweed breeding block 3 with the pressing tool 11. In order to fix the pressing tool 11, the seaweed breeding block 3 has a nut (not shown) embedded so as to be exposed on the surface. A set screw 12 is screwed into this nut to fix the pressing tool 11 to the surface. The pressing tool 11 is in the form of an elongated plate, and a set screw 12 is inserted into the through hole 13 and fixed to the surface of the seagrass breeding block 3 with the set screw 12. The seagrass breeding block 3 firmly fixes the string material 10 with the pressing tool 11 so as not to move loosely in the ocean current or tide. For this reason, the seaweed planted on the string material 10 grows by extending the root from the string material 10 to the gap between the grass propagation blocks 3 made of porous concrete, and then settles on the sea grass propagation block 3.

  The seagrass breeding block 3 is fixed to the uppermost fishing reef body 1 by bonding with mortar or the like, or fixed by a structure such as screwing. The uppermost fishing reef body has an insertion recess on the top where the seagrass breeding block is inserted and fixed in place, and the lower end of the seagrass breeding block is inserted into this insertion recess, and the seagrass breeding block is placed in place. it can.

The artificial reef with the above structure is installed on the seabed as follows.
(1) A seagrass breeding block 3 is fixed to the uppermost reef body 1.
(2) A plurality of reef bodies 1 are stacked, and a reef body 1 to which a seagrass breeding block 3 is fixed is stacked on the top.
(3) The connecting rod 8 is inserted into the connecting hole 7 of the stacked reef body 1, and the stacked reef body 1 is connected by the connecting rod 8.
(4) The artificial reefs that are stacked and connected to each other are suspended from the seabed. The uppermost fishing reef body 1 has a hook 15 for suspension attached to the upper surface. A wire is connected to the hook 15 and is suspended from the wire and installed on the seabed.

  In the above method, the reef bodies 1 are stacked and connected on land, and the connected artificial reefs are installed on the seabed. However, the reef bodies 1 can be stacked on the seabed and connected by the connecting rod 8. In this method, a fishing reef body 1 that does not fix the seagrass breeding block 3 and a fishing reef body 1 that fixes the seagrass breeding block 3 are suspended from the seabed, and a diver lays the reef body 1 on the seabed and connects them with a connecting rod 8. And install in a predetermined position.

1 is a perspective view of an artificial fishing reef according to an embodiment of the present invention. It is a rear view of the artificial reef shown in FIG. It is a top view of the artificial reef shown in FIG. It is a front view of the artificial reef concerning other examples of the present invention. It is a front view of the artificial reef concerning other examples of the present invention. It is a partial cross section front view of the artificial fishing reef concerning the other Example of this invention. It is a perspective view which shows an example of a seaweed breeding block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fishing reef body 2 ... Inhabitant gap 3 ... Seagrass breeding block 4 ... Opposite surface 5 ... Leg part 6 ... Through hole 7 ... Connection hole 8 ... Connection rod 8A ... Coral 9 ... Nut 10 ... String material 11 ... Pressing tool 12 ... Stop Screw 13 ... Through hole 14 ... Support plate 15 ... Hook 16 ... Mortar

Claims (13)

An artificial reef in which a plurality of reef bodies (1) formed of concrete are laminated,
A plurality of reef bodies (1) are stacked and connected to each other to provide a seafood gap (2) between the upper and lower reef bodies (1). The reef body (1) has one or both of the opposing surfaces (4) of the habitat gap (2) as inclined surfaces and a plurality of legs (5) so as to change toward the direction,
A plurality of reef bodies (1) are stacked so that the tips of the legs (5) of the reef bodies (1) stacked on each other are in contact with the opposing surface (4) of the opposing reef body (1). Artificial fishing reef with a habitat gap (2) in which the vertical spacing varies in the horizontal direction with the bottom surface of the reef body and the top surface of the bottom reef body.   The reef body (1) has an inclined bottom surface and a plurality of reef bodies so that the lower end of the leg (5) of the reef body (1) stacked in the upper stage contacts the upper surface of the lower reef body (1). (1) are stacked to provide a habitat gap (2) in which the vertical spacing varies horizontally with the inclined surface on the lower surface of the upper reef body (1) and the upper surface of the lower reef body (1). The artificial fishing reef according to claim 1.   The reef body (1) has a through hole (6) up and down to provide a connection hole (7), and the connection rod (8) is inserted into this connection hole (7) to connect the upper and lower reef body (1). The artificial reef according to claim 1 or 2, wherein the reefs are connected so as not to be displaced in a horizontal direction.   The artificial fishing reef according to claim 1 or 2, wherein a plurality of legs (5) are provided on the outer periphery of the fishing reef body (1).   The artificial reef according to claim 1 or 2, wherein the planar shape of the reef body (1) is a quadrangle, and legs (5) are provided at the four corners of the quadrangle.   The artificial reef according to claim 1 or 2, wherein the reef body (1) is provided with a through hole (6) in a central portion in a planar shape.   The artificial reef according to claim 1 or 2, wherein a seaweed breeding block (3) made of porous concrete is fixed on the uppermost reef body (1).   The artificial reef according to claim 1 or 2, wherein a plurality of seaweed breeding blocks (3) formed into a rectangular parallelepiped are fixed on the uppermost reef body (1).   The artificial reef according to claims 5 and 8, wherein a quadrangular seagrass breeding block (3) is fixed vertically and horizontally on an upper surface of a reef body (1) having a quadrangular planar shape.   The artificial reef according to claim 1 or 2, wherein the minimum vertical gap of the habitat gap (2) is 0 to 10 cm.   The artificial reef according to claim 1 or 2, wherein the maximum vertical gap of the habitat gap (2) is wider than the minimum vertical gap and is 7 to 20 cm.   The artificial fishing reef according to claim 1 or 2, wherein a string material (10) for planting seaweed is arranged on the surface of the seagrass breeding block (3). The artificial fishing reef according to claim 12, wherein the string material (10) disposed on the surface of the seaweed breeding block (3) is fixed by a pressing tool (11) fixed to the seaweed breeding block (3).

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