JP7572271B2 - Proliferating reef - Google Patents

Description

The present invention relates to a propagation reef used for propagating epiphytic marine organisms such as coral, seaweed or seagrass.

Conventionally, there has been known a propagating reef in which epiphytic marine organisms such as coral, seaweed, or seagrass are transplanted and installed in the sea for the purpose of propagating the organisms. The following Patent Document 1 discloses, as an example of such a propagating reef, a coral culture device for cultivating coral in the sea.

The coral cultivation device disclosed in Patent Document 1 has an artificial substrate made of natural stone or concrete to which coral pieces as transplants are fixed, and an underwater anchoring device for installing the artificial substrate in the sea. The underwater anchoring device has a stake erected on the seabed, and an anchoring device that is removably attached to the stake and holds the artificial substrate in the sea. The anchoring device has a joint pipe that fits into the stake, and a substrate receiving device that is fixed to the top of the joint pipe and receives the artificial substrate from below. This coral cultivation device is installed in the sea with the coral pieces fixed to the artificial substrate, and over a period of time, the coral pieces fixed to the artificial substrate grow and the coral proliferates.

JP 2002-84920 A

One example of the proliferation process of epiphytic marine organisms is a process in which an epiphytic marine organism releases a proliferation source such as eggs, spores or seeds into the sea, which then attaches to some object in the sea, and the epiphytic marine organism grows from the attached proliferation source, thereby proliferating. In this process, the proliferation source released from the epiphytic marine organism sinks in the sea around the epiphytic marine organism that released the proliferation source.

However, when attempting to grow epiphytic marine organisms through the above-mentioned growth process using the coral culture device disclosed in Patent Document 1, the growth sources (eggs) released into the sea from the coral fragments as transplants fixed to the artificial substrate tend to dissipate and are difficult to settle, making it difficult to promote the growth of epiphytic marine organisms through the above-mentioned growth process.

The object of the present invention is to provide a reef that can capture, with a high probability, the sources of proliferation that are released from transplants of epiphytic marine organisms and sink in the sea around the transplants, thereby promoting the proliferation of epiphytic marine organisms.

The proliferation reef provided by the present invention is one in which epiphytic marine organisms are transplanted and which promotes proliferation of the epiphytic marine organisms from the transplanted transplant. This proliferation reef comprises a transplant holder that holds the transplant to allow the transplant to release a proliferation source, which is either an egg, a spore or a seed, and a first proliferation source receiving part that is arranged to surround the transplant holder when viewed from above and receives the proliferation source that is released from the transplant held by the transplant holder and sinks in the sea around the transplant holder. The first proliferation source receiving part has a shape that becomes higher as it moves away from the transplant holder outward, and has a first receiving surface that receives the proliferation source.

In this reef, when the proliferation source released from the transplant of epiphytic marine organisms held in the transplant holding part sinks in the sea around the transplant, the sinking proliferation source can be received with a high probability by the first proliferation source receiving part, so that the proliferation source released from the transplant and sinking in the sea can be captured with a high probability, promoting the proliferation of epiphytic marine organisms.

Specifically, the first growth source receiving portion is disposed so as to surround the transplant holding portion when viewed from above, and therefore can receive with a high probability the growth source that is released from the transplant of epiphytic marine organisms held in the transplant holding portion and sinks in the sea around the transplant. In addition, the first receiving surface of the first growth source receiving portion has a shape that becomes higher as it moves outward from the transplant holding portion, so that even if the growth source sinks while moving outward from the transplant holding portion due to the influence of ocean currents, etc., such a growth source can be effectively received by the first receiving surface. Therefore, in the growth reef, it is possible to capture with a high probability the growth source that is released from the transplant held in the transplant holding portion and sinks in the sea around the transplant, and epiphytic marine organisms can be grown from the captured growth source, and the growth of epiphytic marine organisms can be promoted.

It is preferable that the first growth source receiving part has a first receiving part outer side facing the opposite side to the first receiving part receiving surface, and at least one first receiving part opening that penetrates the first growth source receiving part from the first receiving part receiving surface to the first receiving part outer side.

With this configuration, the proliferation source not only adheres to the first receiving surface of the first proliferation source receiving part, but also passes through the first receiving part opening, wraps around to the back side, and adheres to the outer side of the first receiving part, which is the surface opposite the first receiving part receiving surface. In addition, the proliferation source is more likely to become caught on the edge of the first receiving part opening than in a flat area, making it easier for the proliferation source to settle. Therefore, with this configuration, it is possible to increase the amount of proliferation source that settles on the first proliferation source receiving part, and further promote the proliferation of epiphytic marine organisms.

It is preferable that the first growth source receiving portion has a first receiving portion outer edge portion that is located outermost within the first growth source receiving portion when viewed from above, and that the first receiving portion opening portion opens outward at the first receiving portion outer edge portion.

With this configuration, the growth source can enter the first receiving part opening from the outward opening of the first receiving part opening, making it easier for the growth source to adhere to the edge of the first receiving part opening. This makes it possible to further increase the amount of growth source that settles in the first growth source receiving part.

It is preferable that the at least one first receiving portion opening includes a plurality of first receiving portion openings arranged at predetermined intervals in the circumferential direction of the first growth source receiving portion.

With this configuration, the effect of increasing the amount of growth source attachment by the first receiving portion opening can be applied to a wide range in the circumferential direction of the first growth source receiving portion. This can promote the growth of epiphytic marine organisms in a wide range in the circumferential direction of the first growth source receiving portion.

The first growth source receiving portion has a plurality of first growth source receiving pieces that are portions between adjacent ones of the plurality of first receiving portion openings in the circumferential direction of the first growth source receiving portion, and each of the plurality of first growth source receiving pieces preferably has a receiving piece body that extends so as to become higher as it moves away from the graft receiving portion to the outside, and a pair of rising portions that rise from both ends of the receiving piece body in the width direction of the receiving piece body perpendicular to the extension direction of the receiving piece body.

With this configuration, when the growth source sinks onto the receiving piece body of each first growth source receiving piece and flows to both sides of the receiving piece body in the width direction, the direction in which the growth source flows can be changed to an inward upward direction by each rising part. This makes it possible to reduce the amount of growth source that spills down through the first receiving piece opening and is scattered. In addition, since the growth source is likely to settle on protruding parts such as the rising parts, the amount of growth source that settles on the first growth source receiving part can be increased.

The first receiving surface has a first receiving surface outer edge that is located on the outermost side of the first receiving surface when viewed from above, and the reef is arranged to surround the transplant holder at a position away from the inner edge of the first receiving surface when viewed from above, and further includes a second proliferation source receiving part that receives the proliferation source that is released from the transplant held by the transplant holder and sinks in the sea around the transplant holder, and the second proliferation source receiving part is preferably arranged to overlap the first receiving surface with a gap between the second proliferation source receiving part and the first receiving surface.

According to this configuration, epiphytic marine organisms can be grown from the proliferation source in the gap, and damage caused by the epiphytic marine organisms can be suppressed. Specifically, in this configuration, the second proliferation source receiving portion is arranged to surround the transplant holder at a position away from the inner side of the outer edge of the first receiving portion receiving surface, which is located at the outermost side of the first receiving portion receiving surface when viewed from above, and is arranged to overlap the first receiving portion receiving surface with a gap between the first receiving portion receiving surface and the second proliferation source receiving portion. Therefore, the proliferation source that sinks onto the first receiving portion receiving surface outside the second proliferation source receiving portion when viewed from above can slide into the gap between the first receiving portion receiving surface and the second proliferation source receiving portion along the slope of the first receiving portion receiving surface and settle at any location in the area of the first receiving portion receiving surface and the outer surface of the second receiving portion facing the gap, and can grow into epiphytic marine organisms. The marine epiphytic organisms that grow in the gap are protected by the first and second growth source receivers and are less likely to be eaten by predators, which reduces damage to the marine epiphytic organisms.

The second growth source receiving portion has a second receiving portion outer surface that faces the first receiving portion receiving surface through the gap, and the second receiving portion outer surface has a shape that becomes higher as it moves outward from the graft holding portion, and it is preferable that the rate of increase in the height of the second receiving portion outer surface in the direction moving outward from the graft holding portion is greater than the rate of increase in the height of the first receiving portion receiving surface in the direction moving outward from the graft holding portion.

According to this configuration, the gap between the receiving surface of the first receiving part and the outer surface of the second receiving part is wider on the outside and narrows toward the inside. This makes it easier for the growth source that sinks onto the receiving surface of the first receiving part outside the second growth source receiving part to enter the gap, and makes it harder for epiphytic marine organisms that grow from the growth source that enters the gap and advances deep inside to be preyed upon by predators. This makes it possible to promote the growth of epiphytic marine organisms in the gap while more effectively suppressing damage caused by the epiphytic marine organisms that grow in the gap.

It is preferable that the second growth source receiving portion has a shape that becomes higher as it moves away from the graft holding portion toward the outside and has a second receiving surface that is a surface that receives the growth source.

With this configuration, even if the proliferation source sinks while moving outward from the transplant holding part due to the influence of ocean currents or the like, such proliferation source can be effectively received by the receiving surface of the second receiving part, which has a shape that becomes higher as it moves outward from the transplant holding part.

It is preferable that the second growth source receiving part has a second receiving part outer side that faces the opposite side to the second receiving part receiving surface and faces the first receiving part receiving surface through the gap, and at least one second receiving part opening that penetrates the second growth source receiving part from the second receiving part receiving surface to the second receiving part outer side.

With this configuration, the proliferation source not only adheres to the second receiving surface of the second proliferation source receiving part, but also passes through the second receiving part opening, wraps around to the back side, and adheres to the outer side of the second receiving part, which is the surface opposite the second receiving part receiving surface. In addition, the proliferation source is more likely to become caught on the edge of the second receiving part opening than in a flat area, making it easier for the proliferation source to settle. Therefore, with this configuration, it is possible to increase the amount of proliferation source that settles on the second proliferation source receiving part, further promoting the proliferation of epiphytic marine organisms.

It is preferable that the second receiving portion opening is positioned away from the first receiving portion opening when viewed from above.

With this configuration, when the growth source sinks from above the second growth source receiving part and sinks further through the second receiving part opening, it is possible to prevent the growth source from sinking further through the first receiving part opening and being dispersed without being received by the first growth source receiving part.

It is preferable that the second growth source receiving portion has a second receiving portion outer edge portion that is located outermost of the second growth source receiving portion when viewed from above, and that the second receiving portion opening portion opens outward at the second receiving portion outer edge portion.

With this configuration, the growth source can enter the second receiving part opening from the outward opening of the second receiving part opening, making it easier for the growth source to adhere to the edge of the second receiving part opening. This makes it possible to further increase the amount of growth source that settles in the second growth source receiving part.

It is preferable that the at least one second receiving portion opening includes a plurality of second receiving portion openings arranged at predetermined intervals in the circumferential direction of the second growth source receiving portion.

With this configuration, the effect of increasing the amount of growth source attachment by the second receiving portion opening can be applied to a wide range in the circumferential direction of the second growth source receiving portion. This makes it possible to promote the growth of epiphytic marine organisms in a wide range in the circumferential direction of the second growth source receiving portion.

It is preferable that the reef further comprises a spaced support part that is fixed to a subsea support body and supports the transplant holder and the first propagation source receiver at a distance above the support body.

With this configuration, the distanced support part can hold the transplant holding part and the first growth source receiving part at a position spaced upward from the subsea object to be fixed. This allows the transplant holding part and the first growth source receiving part to be kept away from predators that attach to and live on the object to be fixed, making it less likely that the transplant of epiphytic marine organisms held in the transplant holding part and the epiphytic marine organisms that have grown in the first growth source receiving part will be eaten.

The spaced support portion has a base on which the graft holding portion and the first growth source receiving portion are placed, and legs that extend downward from the base and are fixed to the fixed body, and it is preferable that the base has a protruding portion that protrudes outward from the portion of the legs that is connected to the base.

With this configuration, even if a predator climbs up the legs from the fixed body, the overhanging part of the base can prevent the predator from rising above the base. This makes it possible to prevent damage to the transplant of epiphytic marine organisms held in the transplant holding part and the epiphytic marine organisms that have grown in the first growth source receiving part from being eaten.

As described above, the present invention provides a propagation reef that can capture with a high probability the proliferation sources that are released from the transplant of epiphytic marine organisms and sink in the sea around the transplant, promoting the proliferation of epiphytic marine organisms.

FIG. 2 is a plan view (top view) of an augmented reef according to one embodiment of the present invention. 2 is a cross-sectional view of a reef according to one embodiment of the present invention taken along the line II-II in FIG. 1 . FIG. 2 is a front view of the transplant holder and central leg of the growth reef shown in FIG. 1 . FIG. 4 is a plan view (top view) of the graft holder shown in FIG. 3 . FIG. 2 is a plan view (top view) of the first propagation source receiving portion of the propagation reef shown in FIG. 1 . FIG. 6 is a view of one of the first growth source receiving pieces of the first growth source receiving portion shown in FIG. 5, viewed from its tip side. This is a plan view (top view) of the second propagation source receiving portion of the propagation reef shown in Figure 1. FIG. 3 is a cross-sectional view corresponding to FIG. 2 of a breeding reef according to a first variant of the present invention. FIG. 9 is a front view of the transplant holder of the propagation reef according to the first modified example shown in FIG. 8 . FIG. 3 is a cross-sectional view corresponding to FIG. 2 of a breeding reef according to a second variant of the present invention.

The following describes an embodiment of the present invention with reference to Figures 1 to 7.

The propagation reef 1 according to one embodiment of the present invention is installed in the sea and promotes the proliferation of epiphytic marine organisms from transplants of epiphytic marine organisms such as coral, seaweed, or sea grass transplanted to the propagation reef 1. The transplants are epiphytic marine organisms capable of releasing a proliferation source that serves as a source of proliferation of the epiphytic marine organisms. For example, when the epiphytic marine organism is coral, a mother coral capable of releasing eggs as a proliferation source is adopted as the transplant, when the epiphytic marine organism is seaweed, a mother algae capable of releasing spores as a proliferation source is adopted as the transplant, and when the epiphytic marine organism is seaweed, a mother algae capable of releasing seeds as a proliferation source is adopted as the transplant. Transplants of epiphytic marine organisms have the property of releasing a proliferation source upward in the sea.

As shown in Figures 1 and 2, the reef 1 according to this embodiment includes a spaced support portion 2, a transplant holder portion 6, a first propagation source receiving portion 8, and a second propagation source receiving portion 10. The spaced support portion 2, the transplant holder portion 6, the first propagation source receiving portion 8, and the second propagation source receiving portion 10 are all made of steel.

The remote support part 2 (see FIG. 2) is fixed to a subsea object (not shown) and supports the transplant holder 6, the first proliferation source receiving part 8, and the second proliferation source receiving part 10 at a distance above the subsea object. The object is, for example, the seabed, such as sand or rocks, or a structure submerged in the sea, such as a fishing reef. The remote support part 2 has a base 3 and legs 4.

The base 3 is a rectangular plate in plan view, and is placed in a horizontal position in the sea. The transplant holder 6, the first growth source receiver 8, and the second growth source receiver 10 are placed on the base 3. The base 3 has one central hole 12 and four peripheral mounting holes 13 that penetrate the base 3 in the thickness direction (up and down direction). The central hole 12 is provided in the center of the base 3 in plan view. The four peripheral mounting holes 13 are provided at positions near the outer edge of the base 3, and at positions that are a predetermined distance away from the four vertices of the base 3 toward the center of the base 3 in plan view. The four inclined legs 15 of the leg 4 are inserted into the four peripheral mounting holes 13, and the leg 4 is connected to the base 3 in this state. The base 3 has a protruding portion 3a that protrudes outward from the part of the leg 4 that is connected to the base 3 when viewed from above. The protruding portion 3a is a portion of the base 3 that is located closer to the outer edge of the base 3 than the four peripheral mounting holes 13 when viewed from above.

The legs 4 extend downward from the base 3 and are fixed to a subsea support body, supporting the base 3 at a distance upward from the support body. The legs 4 support the base 3 so that it is in a substantially horizontal position. The legs 4 have a central leg 14 and four inclined legs 15.

The central leg 14 supports the base 3 at the center of the base 3 when viewed from above. This central leg 14 is shaped like a straight rod and extends vertically relative to the base 3. The portion near the upper end of this central leg 14 is inserted into the central hole 12 of the base 3 and fixed to the base 3. The lower end of the central leg 14 is fixed to the object to be fixed.

The four inclined legs 15 support the base 3 near its four vertices. Each of the four inclined legs 15 is shaped like a straight rod. The upper end of each inclined leg 15 is inserted into one of the four peripheral mounting holes 13 of the base 3 and fixed to the base 3. Each inclined leg 15 extends obliquely with respect to the base 3 and the central leg 14 so as to approach the central leg 14 as it extends downward from its upper end, and the lower end of each inclined leg 15 is fixed to the intermediate portion of the central leg 14 between the base 3 and the lower end of the central leg 14. The protruding portion 3a of the base 3 protrudes outward from the portion near the upper end of each inclined leg 15 connected to the base 3.

The transplant holder 6 holds the transplant of epiphytic marine organisms transplanted to the reef 1 so as to allow the transplant to release the growth source. The transplant holder 6 is provided at the upper end of the central leg 14 as shown in FIG. 3 and is formed integrally with the central leg 14. As shown in FIG. 2, the transplant holder 6 is disposed above the base 3, the first receiving base plate 18 of the first growth source receiving part 8 (described later), and the second receiving base plate 24 of the second growth source receiving part 10. The transplant holder 6 has four holding pieces 16 as shown in FIG. 4.

The four retaining pieces 16 are parts that receive and hold the transplant of epiphytic marine organisms from below, and are arranged so that they spread out radially when viewed from above. Each retaining piece 16 extends obliquely with respect to the axial direction of the central leg 14 so as to move radially outward from the central leg 14 as it extends upward. Gaps are formed between adjacent retaining pieces 16 in the circumferential direction of the central leg 14. The transplant is inserted from above into the space surrounded by the four retaining pieces 16 and is held by the four retaining pieces 16.

The member in which the transplant holder 6 and the central leg 14 are integrated is formed by processing a deformed steel bar with numerous rib-like protrusions formed on the outer peripheral surface of a straight bar. Specifically, a cross is cut into one end of the deformed steel bar in the axial direction so as to divide the end into four parts in the circumferential direction, and the four holding pieces 16 are formed by deforming each of the four divided parts so as to open outward in the radial direction of the deformed steel bar, and the parts of the deformed steel bar other than those processed into the four holding pieces 16 become the central leg 14.

As shown in Figs. 1 and 2, the first growth source receiving part 8 is installed on the base 3 and is arranged to surround the transplant holder 6 when viewed from above, and receives the growth source that is released upward from the transplant of the epiphytic marine organism held by the transplant holder 6 and sinks in the sea around the transplant holder 6. The growth source received by the first growth source receiving part 8 settles at one of the first growth source receiving parts 8 and grows into an epiphytic marine organism. The first growth source receiving part 8 is located inside the outer edge of the base 3 when viewed from above. The first growth source receiving part 8 has a first receiving part base plate part 18, a first receiving part receiving surface 19, a first receiving part outer surface 20, a first receiving part outer edge part 21, and multiple (six in this embodiment) first receiving part openings 22.

The first receiving base plate portion 18 is flat and is disposed on the upper surface of the base 3 so as to fit along the upper surface of the base 3, and is fixed to the base 3. The first receiving base plate portion 18 has a polygonal (hexagonal in this embodiment) outer shape when viewed from above. A first insertion hole 18a is provided in the center of the first receiving base plate portion 18 when viewed from above, penetrating the first receiving base plate portion 18 in its plate thickness direction (vertical direction). The first insertion hole 18a is disposed so as to be concentric with the central hole 12 of the base 3 when viewed from above. The first receiving base plate portion 18 is fixed to the central leg portion 14 with the upper end portion of the central leg portion 14 inserted into the first insertion hole 18a.

The first receiving surface 19 is a surface that receives the proliferation source that is released from the transplant and sinks into the sea. The first receiving surface 19 has a shape that becomes higher as it moves outward from the transplant holder 6. The first receiving surface 19 is inclined so as to face the transplant holder 6 side. Specifically, the first receiving surface 19 extends outward from the outer edge of the upper surface of the first receiving base plate portion 18, and is inclined with respect to the upper surface of the first receiving base plate portion 18 so as to become higher as it moves outward. The first receiving surface 19 has a first receiving surface outer edge 19a that is located at the outermost position of the first receiving surface 19 when viewed from above.

The first receiving part outer surface 20 is a surface facing the opposite side to the first receiving part receiving surface 19. Like the first receiving part receiving surface 19, the first receiving part outer surface 20 has a shape that becomes higher as it moves outward from the transplant holding part 6. Specifically, the first receiving part outer surface 20 extends outward from the outer edge of the lower surface of the first receiving part base plate part 18, and is inclined with respect to the lower surface of the first receiving part base plate part 18 so as to become higher as it moves outward.

The first receiving part outer edge 21 is the outermost part of the first growth source receiving part 8 when viewed from above.

The multiple first receiving part openings 22 (see FIG. 5) are openings that penetrate the first growth source receiving part 8 from the first receiving part receiving surface 19 to the first receiving part outer surface 20. The multiple first receiving part openings 22 are arranged at equal intervals in the circumferential direction of the first growth source receiving part 8 when the first growth source receiving part 8 is viewed from above. In addition, the multiple first receiving part openings 22 each open outward at the first receiving part outer edge part 21. The multiple first receiving part openings 22 divide the portion of the first growth source receiving part 8 that is located outside the first receiving part base plate part 18 into multiple (six in this embodiment) first growth source receiving pieces 23 in the circumferential direction of the first growth source receiving part 8. In other words, the first growth source receiving part 8 has multiple first growth source receiving pieces 23 that are portions between adjacent ones of the multiple first receiving part openings 22 in the circumferential direction of the first growth source receiving part 8.

The multiple first growth source receiving pieces 23 protrude radially from the outer edge of the first receiving base plate 18 to the outside of the first receiving base plate 18 when viewed from above. Specifically, the multiple first growth source receiving pieces 23 protrude outward from each of the multiple sides of the first receiving base plate 18 that form the outer edge of the polygonal first receiving base plate 18 when viewed from above. Each first growth source receiving piece 23 has a shape that becomes higher as it moves outward from the first receiving base plate 18. Each first growth source receiving piece 23 has a receiving piece main body 23a and a pair of rising portions 23b.

The receiving piece body 23a is a portion that extends outwardly from the corresponding side of the outer edge of the first receiving base plate 18. The first receiving piece body 23a is a flat plate with the same thickness as the first receiving base plate 18, and extends obliquely relative to the first receiving base plate 18 so as to become higher as it moves away from the transplant holding part 6 toward the outside. The first receiving piece body 23a is formed by bending and raising it relative to the first receiving base plate 18 at the position of the outer edge of the first receiving base plate 18.

The pair of rising parts 23b are parts that rise from both ends of the first support body 23a in the width direction perpendicular to the extension direction of the first support body 23a. As shown in FIG. 6, each rising part 23b is a flat plate with the same plate thickness as the first support body 23a, and is inclined relative to the first support body 23a so as to rise upward as it moves toward the outside in the width direction of the first support body 23a. Each rising part 23b is formed by bending and raising it relative to the first support body 23a at the position of the edge in the width direction of the first support body 23a.

As shown in Figs. 1 and 2, the second growth source receiving part 10 is installed on the first growth source receiving part 8 and is arranged to surround the transplant holder 6 at a position away from the inner side of the outer edge 19a of the first receiving part receiving surface of the first growth source receiving part 8 when viewed from above, and receives the growth source that is released upward from the transplant of the epiphytic marine organism held by the transplant holder 6 and sinks in the sea around the transplant holder 6. That is, the second growth source receiving part 10 receives the growth source that sinks inside the first growth source receiving part 8, specifically, the growth source that sinks near the transplant holder 6. The growth source received by the second growth source receiving part 10 settles at any point of the second growth source receiving part 10 and grows into an epiphytic marine organism. The second growth source receiving part 10 is arranged to overlap the first receiving part receiving surface 19 with a gap 30 interposed between the second growth source receiving part 10 and the first receiving part receiving surface 19. The second growth source receiving part 10 has a second receiving part base part 24, a second receiving part receiving surface 25, a second receiving part outer surface 26, a second receiving part outer edge part 27, and multiple (six in this embodiment) second receiving part openings 28.

The second receiving part substrate part 24 is flat and is arranged on the upper surface of the first receiving part substrate part 18 of the first growth source receiving part 8 so as to be aligned with the upper surface of the first receiving part substrate part 18. In other words, the second receiving part substrate part 24 is arranged approximately horizontally above the base 3 so as to be parallel to the base 3. When viewed from above, the second receiving part substrate part 24 has a polygonal shape (hexagonal shape in this embodiment) having the same number of vertices as the first receiving part substrate part 18. The second receiving part substrate part 24 has a smaller outer shape than the first receiving part substrate part 18. The second receiving part substrate part 24 is arranged so as to be concentric with the first receiving part substrate part 18 when viewed from above. The second receiving part substrate part 24 is arranged so that each vertex of the second receiving part substrate part 24 is located on a straight line connecting the midpoint of each side of the outer edge of the first receiving part substrate part 18 and the center of the first receiving part substrate part 18 when viewed from above. A second insertion hole 24a is provided in the center of the second receiving base plate portion 24 when viewed from above, penetrating the second receiving base plate portion 24 in its plate thickness direction (vertical direction). The second insertion hole 24a is arranged so as to be concentric with the first insertion hole 18a of the first receiving base plate portion 18 and the central hole 12 of the base 3 when viewed from above. The second receiving base plate portion 24 is fixed to the central leg portion 14 with the upper end of the central leg portion 14 inserted into the second insertion hole 24a.

The second receiving surface 25 is a surface that receives the proliferation source that is released from the transplant and sinks into the sea. The second receiving surface 25 has a shape that becomes higher as it moves outward from the transplant holding part 6. The second receiving surface 25 is inclined so as to face the transplant holding part 6 side. Specifically, the second receiving surface 25 extends outward from the outer edge of the upper surface of the second receiving base plate part 24, and is inclined with respect to the upper surface of the second receiving base plate part 24 so as to become higher as it moves outward.

The second receiving part outer surface 26 is a surface facing the opposite side to the second receiving part receiving surface 25, and faces the first receiving part receiving surface 19 through the gap 30. The second receiving part outer surface 26, like the second receiving part receiving surface 25, has a shape that becomes higher as it moves outward from the graft holding part 6. Specifically, the second receiving part outer surface 26 extends outward from the outer edge of the lower surface of the second receiving part base plate part 24, and is inclined with respect to the lower surface of the second receiving part base plate part 24 so as to become higher as it moves outward. The rate of increase in the height of the second receiving part outer surface 26 in the direction moving outward from the graft holding part 6 is greater than the rate of increase in the height of the first receiving part receiving surface 19 in the direction moving outward from the graft holding part 6. In other words, the inclination angle of the second receiving part outer surface 26 is greater than the inclination angle of the first receiving part receiving surface 19. Specifically, the inclination angle of the second receiving part outer surface 26 is approximately twice as large as the inclination angle of the first receiving part receiving surface 19. Due to the above-described configuration of the second receiving part outer surface 26, the gap 30 between the first receiving part receiving surface 19 and the second receiving part outer surface 26 becomes narrower toward the graft holding part 6 side (inside).

The second receiving part outer edge 27 is the outermost part of the second growth source receiving part 10 when viewed from above.

The second receiving part openings 28 (see FIG. 7) are openings that penetrate the second growth source receiving part 10 from the second receiving part receiving surface 25 to the second receiving part outer surface 26. The second receiving part openings 28 are arranged at equal intervals in the circumferential direction of the second growth source receiving part 10 when the second growth source receiving part 10 is viewed from above. The second receiving part openings 28 are each arranged at a position that is out of the first receiving part openings 22 in the circumferential direction of the second growth source receiving part 10 when viewed from above (see FIG. 1). In other words, when viewed from above, the first receiving part receiving surface 19 of the first growth source receiving part 8 overlaps the lower side of each second receiving part opening 28, and the first receiving piece body 23a of the first growth source receiving piece 23 overlaps the lower side of each second receiving part opening 28. In addition, the second receiving part openings 28 each open outward at the second receiving part outer edge 27. The second receiving part openings 28 divide the portion of the second growth source receiving part 10 located outside the second receiving part base part 24 into a plurality of (six in this embodiment) second growth source receiving pieces 29 in the circumferential direction of the second growth source receiving part 10. In other words, the second growth source receiving part 10 has a plurality of second growth source receiving pieces 29 that are portions between adjacent ones of the second receiving part openings 28 in the circumferential direction of the second growth source receiving part 10.

The second growth source receiving pieces 29 protrude radially from the outer edge of the second receiving part substrate 24 when viewed from above. Specifically, the second growth source receiving pieces 29 extend outwardly continuously from each of the multiple sides of the second receiving part substrate 24 that form the outer edge of the polygonal second receiving part substrate 24 when viewed from above. Each second growth source receiving piece 29 is flat with the same plate thickness as the second receiving part substrate 24 and extends obliquely relative to the second receiving part substrate 24 so as to become higher as it moves away from the graft holding part 6 to the outside. Each second growth source receiving piece 29 is formed by bending and raising it relative to the second receiving part substrate 24 at the position of the outer edge of the second receiving part substrate 24. In addition, the length from the outer edge of the second receiving base plate 24 to the tip of each second growth source receiving piece 29 in the protruding direction is smaller than the length from the outer edge of the first receiving base plate 18 to the tip of each first growth source receiving piece 23 in the protruding direction.

In the proliferation reef 1 according to this embodiment, when the proliferation source released from the transplant of epiphytic marine organisms held in the transplant holding portion 6 sinks in the sea around the transplant (around the transplant holding portion 6), the sinking proliferation source can be received with a high probability by the first proliferation source receiving portion 8, so that the proliferation source released from the transplant and sinking in the sea can be captured with a high probability, promoting the proliferation of epiphytic marine organisms.

Specifically, since the first growth source receiving portion 8 is disposed around the transplant holding portion 6 when viewed from above, it is possible to receive with a high probability the growth source that is released from the transplant of epiphytic marine organisms held in the transplant holding portion 6 and sinks in the sea around the transplant. In addition, since the first receiving surface 19 of the first growth source receiving portion 8 has a shape that becomes higher as it moves outward from the transplant holding portion 6, even if the growth source sinks while moving outward from the transplant holding portion 6 due to the influence of ocean currents, etc., such a growth source can be effectively received by the first receiving surface 19. Therefore, in the growth reef 1 according to this embodiment, it is possible to capture with a high probability the growth source that is released from the transplant held in the transplant holding portion 6 and sinks in the sea around the transplant, and epiphytic marine organisms can be grown from the captured growth source, thereby promoting the growth of epiphytic marine organisms.

In addition, in the reef 1 according to this embodiment, the first growth source receiving portion 8 has a plurality of first receiving portion openings 22 that penetrate the first growth source receiving portion 8 from the first receiving portion receiving surface 19 to the first receiving portion outer surface 20. Therefore, the growth source can not only attach to the first receiving portion receiving surface 19 of the first growth source receiving portion 8, but also pass through the first receiving portion openings 22 to the back side and attach to the first receiving portion outer surface 20, which is the surface opposite the first receiving portion receiving surface 19. In addition, the growth source is more likely to be caught on the edge of the first receiving portion opening 22 than in a flat area, so the growth source is more likely to settle. Therefore, the amount of growth source that settles on the first growth source receiving portion 8 can be increased, and the growth of epiphytic marine organisms can be further promoted.

In addition, each of the multiple first receiving part openings 22 opens outward at the first receiving part outer edge 21 that is located outermost in the first growth source receiving part 8 when viewed from above, so that the growth source can enter each first receiving part opening 22 from the outward opening of each first receiving part opening 22. This makes it easier for the growth source to adhere to the edge of the first receiving part opening 22. This makes it possible to further increase the amount of growth source that settles in the first growth source receiving part 8.

In addition, in the proliferation reef 1 according to this embodiment, multiple first receiving portion openings 22 are arranged at predetermined intervals in the circumferential direction of the first proliferation source receiving portion 8, so that the effect of increasing the amount of proliferation source fixed by the first receiving portion openings 22 can be exerted over a wide range in the circumferential direction of the first proliferation source receiving portion 8. This makes it possible to promote the proliferation of epiphytic marine organisms over a wide range in the circumferential direction of the first proliferation source receiving portion 8.

In addition, in the growing reef 1 according to this embodiment, epiphytic marine organisms can be grown from the growth source in the gap 30, and feeding damage by the epiphytic marine organisms can be suppressed.

Specifically, in the growth reef 1 according to this embodiment, the second growth source receiving part 10 is arranged to surround the transplant holder 6 at a position away from the inner side of the outer edge 19a of the first receiving part receiving surface 19, which is the outermost part of the first receiving part receiving surface 19 when viewed from above, and is arranged to overlap the first receiving part receiving surface 19 with a gap 30 interposed between the first receiving part receiving surface 19. Therefore, a growth source that sinks onto the first receiving part receiving surface 19 outside the second growth source receiving part 10 when viewed from above can slide along the slope of the first receiving part receiving surface 19 into the gap 30 between the first receiving part receiving surface 19 and the second growth source receiving part 10 and settle at any location in the area of the first receiving part receiving surface 19 and the second receiving part outer surface 26 facing the gap 30, and can grow into an epiphytic marine organism. The epiphytic marine organisms in the gap 30 are protected by the first growth source receiving portion 8 and the second growth source receiving portion 10 and are therefore less likely to be eaten by predators, which reduces damage to the epiphytic marine organisms. If the epiphytic marine organisms are corals, the predators are, for example, starfish such as crown-of-thorns starfish, and if the epiphytic marine organisms are seaweed or seagrass, the predators are, for example, sea urchins.

In addition, in the growing reef 1 according to this embodiment, the rate of increase in the height of the second receiving part outer surface 26 in the direction away from the transplant holding part 6 is greater than the rate of increase in the height of the first receiving part receiving surface 19 in the direction away from the transplant holding part 6, so the gap 30 between the first receiving part receiving surface 19 and the second receiving part outer surface 26 narrows as it moves inward. This makes it harder for epiphytic marine organisms that grow from the growth source that has penetrated deep inside this gap to be preyed upon by predators, and as a result, damage caused by the epiphytic marine organisms that grow within the gap 30 can be more effectively suppressed.

In addition, in the propagation reef 1 according to this embodiment, the second propagation source receiving portion 10 has a second receiving surface 25 that is shaped to become higher as it moves outward from the transplant holding portion 6. Therefore, even if the propagation source sinks while moving outward from the transplant holding portion 6 due to the influence of ocean currents, etc., such a propagation source can be effectively received by the second receiving surface 25.

In addition, in the reef 1 according to this embodiment, the second growth source receiving part 10 has a plurality of second receiving part openings 28 that penetrate the second growth source receiving part 10 from the second receiving part receiving surface 25 to the second receiving part outer surface 26. Therefore, the growth source can not only attach to the second receiving part receiving surface 25 of the second growth source receiving part 10, but also pass through the second receiving part openings 28 and go around to the back side to attach to the second receiving part outer surface 26, which is the surface opposite the second receiving part receiving surface 25. In addition, the growth source is more likely to be caught on the edge of the second receiving part opening 28 than in a flat area, so the growth source is more likely to be fixed. Therefore, the amount of growth source fixed in the second growth source receiving part 10 can be increased, and the growth of epiphytic marine organisms can be further promoted.

In addition, in the propagation reef 1 according to this embodiment, each second receiving portion opening 28 is positioned at a position that is offset from the first receiving portion opening 22 when viewed from above. Therefore, when a propagation source sinking from above the second propagation source receiving portion 10 sinks further through each second receiving portion opening 28, it is possible to prevent the propagation source from sinking further through the first receiving portion opening 22 and being dispersed without being received by the first propagation source receiving portion 8.

In addition, since each second receiving part opening 28 opens outward at the second receiving part outer edge 27 that is located outermost in the second growth source receiving part 10 when viewed from above, the growth source can enter each second receiving part opening 28 from the outward opening of each second receiving part opening 28. This makes it easier for the growth source to adhere to the edge of the second receiving part opening 28. This makes it possible to further increase the amount of growth source that settles in the second growth source receiving part 10.

In addition, in the proliferation reef 1 according to this embodiment, multiple second receiving portion openings 28 are arranged at predetermined intervals in the circumferential direction of the second proliferation source receiving portion 10, so that the effect of increasing the amount of proliferation source fixed by the second receiving portion openings 28 can be exerted over a wide range in the circumferential direction of the second proliferation source receiving portion 10. This makes it possible to promote the proliferation of epiphytic marine organisms over a wide range in the circumferential direction of the second proliferation source receiving portion 10.

In the reef 1 according to this embodiment, the first growth source receiving portion 8 has a plurality of first growth source receiving pieces 23 that are portions between adjacent first receiving portion openings 22 in the circumferential direction of the first growth source receiving portion 8, and each of the first growth source receiving pieces 23 has a receiving piece body 23a that extends so as to become higher as it moves away from the transplant receiving portion 6 to the outside, and a pair of rising parts 23b that rise from both ends in the width direction of the receiving piece body 23a perpendicular to the extension direction of the receiving piece body 23a. Therefore, when the growth source that sinks on the receiving piece body 23a of each first growth source receiving piece 23 flows to both sides in the width direction of the receiving piece body 23a, the flow direction of the growth source can be changed to an inward upward direction by each rising part 23b. Therefore, the growth source that spills through each first receiving portion opening 22 and dissipates can be reduced. In addition, because the growth source is likely to settle in protruding parts such as the rising portion 23b, the amount of growth source that settles in the first growth source receiving portion 8 can be increased.

The reef 1 according to this embodiment also includes a separation support part 2 that supports the transplant holder 6, the first proliferation source receiver 8, and the second proliferation source receiver 10 in a state separated upward from the subsea object to be fixed. This separation support part 2 therefore makes it possible to keep the transplant holder 6, the first proliferation source receiver 8, and the second proliferation source receiver 10 away from predators that attach to and live on the object to be fixed, making it less likely that the transplant of epiphytic marine organisms held by the transplant holder 6, and the epiphytic marine organisms that have proliferated on the first proliferation source receiver 8 and the second proliferation source receiver 10, will be preyed upon.

In the reef 1 according to this embodiment, the support 2 has a base 3 on which the transplant holder 6, the first and second recipients 8 and 10 are placed, and a leg 4 extending downward from the base 3 and fixed to the object to be fixed. The base 3 has a protruding portion 3a that protrudes outward from the portion of the leg 4 that is connected to the base 3. Therefore, even if a predator climbs up the leg 4 from the object to be fixed, the protruding portion 3a of the base 3 can prevent the predator from rising above the base 3. Therefore, the transplant of epiphytic marine organisms held in the transplant holder 6 and the epiphytic marine organisms that have proliferated in the first and second recipients 8 and 10 can be prevented from being eaten.

(Modification)
The breeding reef according to the present invention is not necessarily limited to the above. For example, the following configurations can be adopted for the breeding reef according to the present invention.

(1) The first growth source receiving portion in the present invention does not necessarily have to have a first receiving portion opening, and may be continuous over the entire circumference. In this case, the first growth source receiving portion may be cup-shaped, continuous over the entire circumference and increasing in height as it moves away from the graft holding portion to the outside.

(2) Also, even if the first growth source receiving part has a first receiving part opening, the first receiving part opening does not open outward at the outer edge of the first receiving part, and may simply be a hole that penetrates the first growth source receiving part from the receiving surface of the first receiving part to the outer surface of the first receiving part.

(3) The second growth source receiving portion in the present invention does not necessarily have to have a second receiving portion opening, and may be continuous over the entire circumferential direction. In this case, the second growth source receiving portion may be cup-shaped, continuous over the entire circumferential direction, and becoming higher as it moves away from the graft holding portion to the outside.

(4) Also, even if the second growth source receiving part has a second receiving part opening, the second receiving part opening does not open outward at the outer edge of the second receiving part, but may simply be a hole that penetrates the second growth source receiving part from the receiving surface of the second receiving part to the outer surface of the second receiving part.

(5) In addition, at least a portion of the second receiving portion opening may overlap with the first receiving portion opening when viewed from above.

(6) The rate of increase in the height of the second receiving surface in the direction away from the graft holder may be equal to the rate of increase in the height of the first receiving surface in the direction away from the graft holder. In other words, the size of the gap between the first receiving surface and the second receiving surface, which corresponds to the distance between the first receiving surface and the second receiving surface, may be uniform.

(7) Furthermore, the propagation reef according to the present invention does not necessarily have to include a second propagation source receiving portion. In other words, the propagation reef according to the present invention may include only a first propagation source receiving portion for receiving the propagation source that is released from the transplant of epiphytic marine organisms held in the transplant holding portion and sinks into the sea.

(8) The reef according to the present invention may also include a further propagation source receiving portion arranged to surround the transplant holder on the outside of the first propagation source receiving portion or on the inside of the second propagation source receiving portion to receive the propagation source sinking in the sea.

(9) The transplant holder in the present invention is not necessarily limited to one having a plurality of holding pieces 16 arranged radially, such as the transplant holder 6 in the above embodiment. For example, the transplant holder in the present invention may be a continuous bowl shape in the entire circumferential direction, having a shape capable of receiving and holding a transplant of an epiphytic marine organism.

(10) As the leg structure in the present invention, in addition to the leg 4 structure in the above embodiment, for example, the leg 4 structure of the augmented reef 1 according to the first modified example of the present invention shown in FIG. 8, or the leg 4 structure of the augmented reef 1 according to the second modified example of the present invention shown in FIG. 10 can be adopted.

Specifically, in the breeding reef 1 according to the first modified example of the present invention (see FIG. 8), the leg 4 has four support legs 31 that are inserted into the four peripheral mounting holes 13 (not shown) of the base 3 and fixed to the base 3, and a number of cross bars 32 that connect adjacent ones of the four support legs 31. Note that FIG. 8 shows a cross section of the breeding reef 1 according to the first modified example at a position corresponding to the II-II position in FIG. 1, so only the two support legs 31 at the back of the page are visible.

The four support legs 31 are fixed to the base 3 by having their upper ends inserted into four peripheral mounting holes 13 (not shown) of the base 3, and extend from their upper ends perpendicularly downward from the base 3. The lower ends of each of the four support legs 31 are then fixed to an underwater support body. Two horizontal crosspieces 32 are arranged vertically and spaced apart between each pair of adjacent support legs 31, and these two horizontal crosspieces 32 extend perpendicularly to the support legs 31 to connect the two adjacent support legs 31 to each other.

In addition, in this first modified example, the central hole 12 provided in the base 3 in the above embodiment is not provided in the center of the base 3, and the graft holder 6 is erected on the central part of the base 3 and fixed to the base 3. Specifically, in this first modified example, the graft holder 6 has a short straight rod-shaped receiver base 34 (see FIG. 9) and four holding pieces 16 provided on the upper end of the receiver base 34. The receiver base 34 is installed on the central part of the base 3 so that its axial direction is perpendicular to the base 3. The receiver base 34 is inserted through the first insertion hole 18a of the first receiver base plate 18 of the first proliferation source receiver 8 and the second insertion hole 24a of the second receiver base plate 24 of the second proliferation source receiver 10, and is fixed to the first receiver base plate 18 and the second receiver base plate 24. The four holding pieces 16 are similar to the four holding pieces 16 of the graft holding part 6 in the previous embodiment.

Other than the above configuration, the configuration of the breeding reef 1 according to the first modified example is the same as that of the breeding reef 1 according to the above embodiment.

In the configuration of the breeding reef 1 according to this first modified example, the four support legs 31 that are connected to each part near the four vertices of the base 3 and support the base 3 are fixed to the fixed body, thereby improving the stability of the installation of the breeding reef 1 in the sea.

(11) In a breeding reef 1 according to a second modified example of the present invention (see FIG. 10), the four support legs 31 of the leg 4 extend obliquely away from each other as they move downward from the base 3. Specifically, in this second modified example, the leg 4 has four support legs 31 that are inserted into the four peripheral mounting holes 13 (not shown) of the base 3 and fixed to the base 3, and a number of cross bars 32 that connect adjacent ones of the four support legs 31. Note that FIG. 10 shows a cross section of the breeding reef 1 according to the second modified example at a position corresponding to the II-II position in FIG. 1, so only the two support legs 31 at the back of the page are shown.

The four support legs 31 have their upper ends inserted into four peripheral mounting holes (not shown) of the base 3 and are fixed to the base 3, and extend downward from the upper ends of the base 3 at an angle relative to the base 3. The lower ends of each of the four support legs 31 are then fixed to the object to be fixed. A horizontal crosspiece 32 is disposed between each of the four adjacent support legs 31, and this horizontal crosspiece 32 extends in a direction intersecting the support legs 31 to connect two adjacent support legs 31 together.

Other than the above configuration, the configuration of the breeding reef 1 according to the second modified example is the same as that of the breeding reef 1 according to the first modified example.

In the configuration of the breeding reef 1 according to this second modified example, the four support legs 31 that are connected to each part near the four vertices of the base 3 and support the base 3 extend outward as they extend downward, thereby further improving the stability of the underwater installation of the breeding reef 1 compared to the configuration of the first modified example.

1 Growth reef 2 Separate support portion 3 Base 3a Projection portion 4 Leg portion 6 Transplant holder portion 8 First growth source receiving portion 10 Second growth source receiving portion 19 First receiving portion receiving surface 19a First receiving portion receiving surface outer edge 20 First receiving portion outer surface 21 First receiving portion outer edge portion 22 First receiving portion opening portion 23 First growth source receiving piece 23a First receiving piece main body 23b Rising portion 25 Second receiving portion receiving surface 26 Second receiving portion outer surface 27 Second receiving portion outer edge portion 28 Second receiving portion opening portion

Claims (14)

A propagation reef in which epiphytic marine organisms are transplanted to promote the proliferation of the epiphytic marine organisms from the transplanted bodies,
a transplant holder for holding the transplant in a manner that allows the transplant to release a propagation source, which may be either an egg, a spore or a seed;
A first proliferation source receiving portion is disposed so as to surround the transplant holding portion when viewed from above, and receives the proliferation source that is released from the transplant held by the transplant holding portion and sinks in the sea around the transplant holding portion,
The first growth source receiving portion has a shape that becomes higher as it moves away from the transplant holding portion outward, and has a first receiving surface that is a surface that receives the growth source. The reef of claim 1, wherein the first propagation source receiving portion has a first receiving portion outer side facing the opposite side to the first receiving portion receiving surface, and at least one first receiving portion opening penetrating the first propagation source receiving portion from the first receiving portion receiving surface to the first receiving portion outer side. The first growth source receiving portion has a first receiving portion outer edge portion located outermost in the first growth source receiving portion when viewed from above,
The reef of claim 2 , wherein the first receiving portion opening opens outward at an outer edge of the first receiving portion. The at least one first receiving portion opening includes a plurality of first receiving portion openings arranged at predetermined intervals in the circumferential direction of the first propagation source receiving portion. The propagation reef according to claim 2 or 3. The first growth source receiving portion has a plurality of first growth source receiving pieces that are portions between adjacent ones of the plurality of first receiving portion openings in the circumferential direction of the first growth source receiving portion,
The proliferation reef described in claim 4, wherein each of the multiple first proliferation source support pieces has a support body that extends so as to become higher as it moves outward from the transplant holding portion, and a pair of raised portions that rise from both ends of the support body in the width direction of the support body perpendicular to the extension direction of the support body. The first receiving surface has a first receiving surface outer edge that is located outermost on the first receiving surface when viewed from above,
The reef is arranged to surround the transplant holder at a position away from the outer edge of the first receiving portion when viewed from above, and further includes a second propagation source receiving portion that receives the propagation source that is released from the transplant held by the transplant holder and sinks in the sea around the transplant holder,
A breeding reef as described in any one of claims 1 to 5, wherein the second breeding source receiving part is arranged to overlap the first receiving part receiving surface with a gap interposed between the second breeding source receiving part and the first receiving part receiving surface. The second growth source receiving portion has a second receiving portion outer surface facing the first receiving portion receiving surface through the gap,
The second receiving portion outer surface has a shape that becomes higher as it moves away from the implant holding portion to the outside,
The reef of claim 6, wherein the rate of increase in height of the second receiving portion outer surface in a direction away from the transplant holder is greater than the rate of increase in height of the first receiving portion receiving surface in a direction away from the transplant holder. The proliferation reef according to claim 6, wherein the second proliferation source receiving portion has a second receiving surface that is shaped to become higher as it moves away from the transplant holding portion outward and is a surface that receives the proliferation source. The reef of claim 8, wherein the second propagation source receiving portion has a second receiving portion outer surface facing the opposite side to the second receiving portion receiving surface and facing the first receiving portion receiving surface through the gap, and at least one second receiving portion opening penetrating the second propagation source receiving portion from the second receiving portion receiving surface to the second receiving portion outer surface. The first receiving surface has a first receiving surface outer edge that is located outermost on the first receiving surface when viewed from above,
The reef is arranged to surround the transplant holder at a position away from the outer edge of the first receiving portion when viewed from above, and further includes a second propagation source receiving portion that receives the propagation source that is released from the transplant held by the transplant holder and sinks in the sea around the transplant holder,
The second growth source receiving portion is disposed so as to overlap the first receiving portion receiving surface with a gap interposed between the second growth source receiving portion and the first receiving portion receiving surface,
The second growth source receiving portion has a shape that becomes higher as it moves away from the graft holding portion to the outside and has a second receiving portion receiving surface that is a surface that receives the growth source,
The second growth source receiving portion has a second receiving portion outer side facing the opposite side to the second receiving portion receiving surface and facing the first receiving portion receiving surface across the gap, and at least one second receiving portion opening penetrating the second growth source receiving portion from the second receiving portion receiving surface to the second receiving portion outer side;
An augmented reef as described in any one of claims 2 to 5 , wherein the second receiving portion opening is positioned away from the first receiving portion opening when viewed from above. The second growth source receiving portion has a second receiving portion outer edge portion located outermost in the second growth source receiving portion when viewed from above,
The reef according to claim 9 or 10, wherein the second receiving portion opening opens outward at an outer edge of the second receiving portion. The at least one second receiving portion opening includes a plurality of second receiving portion openings arranged at predetermined intervals in the circumferential direction of the second propagation source receiving portion. The propagation reef according to any one of claims 9 to 11. The reef according to any one of claims 1 to 12, further comprising a spaced support part that is fixed to a fixed body in the sea and supports the transplant holding part and the first growth source receiving part in a spaced upward position from the fixed body. The spaced support portion has a base on which the graft holding portion and the first growth source receiving portion are placed, and a leg portion extending downward from the base and fixed to the fixed body,
The reef of claim 13, wherein the base has an overhang that extends outwardly of the portion of the leg that is connected to the base.

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