JP4878544B2 - Coral breeding base and coral breeding method - Google Patents

Description

  The present invention relates to a coral breeding base and a coral breeding method for promoting the growth of coral planula larvae to grow corals.

  Coral reefs are terrain created by the accumulation of calcareous skeletons of organisms such as corals, and are ecosystems. The limestone created by coral reefs becomes part of the crust. The coral is symbiotic with microalgae, and the coral and coral reef organisms are fed by the photosynthesis of the algae. Coral reefs are the most species-diversified ecosystem in the ocean, but this is maintained by high photosynthetic production and the diversity of habitats created by the coral reef topography. In addition, both photosynthesis and calcification of coral reefs have the function of accumulating atmospheric carbon dioxide in the biosphere and the crust as organic matter and limestone (see Non-Patent Document 1 below).

  Corals have a complex branch structure and are suitable for hideouts and feeding grounds for fish and other organisms, so coral reefs provide a place for living various creatures in the sea, and corals themselves also feed on coral polypivorous fish. However, in recent years, sediments such as red soil due to coastal development (corals suffocate), large-scale occurrence of giant starfish (eating corals), abnormalities, etc. Corals are killed due to whitening phenomenon at high temperature (algae in coral escape due to high water temperature), and coral reef ecosystem destruction is a problem.

  Conservation and regeneration of coral reefs that are in a critical situation are desired due to the above-mentioned sediment runoff, food damage caused by the starfish, whitening due to high water temperature, and the like. For this reason, in recent years, coral planula larvae (hereinafter also referred to as “larvae”) have been collected in the local sea area as a coral propagation method, moved to another location, and then artificially grown on the base and grown seedlings. Although there is a method of returning to the local sea area, there is a problem that considerable costs are involved in processes such as collection, transportation and seedling breeding. On the other hand, the method of installing a foundation such as a concrete block where larvae can grow without collecting local larvae in the local sea area is cheap, and in fact, there are many cases where corals grow on the surface of wave-dissipating blocks etc. .

In addition, there is a method of promoting the growth by processing the base in order to efficiently allow the larva to settle on the base. For example, as shown in Patent Document 1 below, a structure having a hole for bottoming the larvae is provided. Proposed. In addition, as disclosed in Patent Document 2 below, a device for causing larvae to grow on a base by means of diffusion prevention has been proposed, but there is a concern that it is difficult to maintain the diffusion prevention device due to external forces such as waves. Moreover, although the following patent document 3 has proposed the larva settlement device which consists of a flooring board part, a spacer part, and one insertion part, this growth device does not perform flow control etc. positively.
The University of Tokyo Graduate School of Science, Department of Earth and Planetary Science, Earth and Planetary System Science Course “What is a coral reef” (searched November 17, 2006), Internet <URL: http: //www-sys.eps.su-tokyo. ac.jp/~coral/contents/kenkyu/01.html) JP 2005-264485 A JP 2003-219755 A JP 2003-61506 A

  An object of the present invention is to provide a coral breeding base and a coral breeding method capable of efficiently growing coral larvae at low cost and allowing coral breeding.

  In the process of coral growth, the larvae need to settle on a rocky reef at the stage of sexual reproduction. However, there is a finding that the larval settlement characteristics are affected by the flow environment at the bottom of the sea, and that the larval settlement rate decreases as the flow velocity increases. In addition, it has been pointed out that red soil and other sediments affect the growth of larvae, but there are reports that many deposits occur on a vertical surface rather than a horizontal surface with many sediments. In addition, in order for larvae to settle, a biofilm such as lime red algae is required on the surface of the growth base, and there is a finding that shading is effective for the growth of lime red algae (Katsunori Yamaki, See Watanabe, Keizo Sakoda, Shinpei Ueno (2005) “Field Experiments on Reef-building Coral Formation Technology by Promoting Indigenous Coral Reef Formation”, Japanese Society of Coral Reefs, 8th Annual Meeting Summary Panel 47).

  In addition to the above-mentioned conventional knowledge, further investigations and researches have been carried out to form a stagnant zone by reducing the flow velocity, and have a vertical surface or a slope (and a downward surface) that can avoid red soil accumulation, etc. The knowledge that coral larvae can be efficiently grown when a base having a light-shielding area is obtained is obtained, and the present invention has been made based on such knowledge.

That is, in order to achieve the above object, a first coral breeding substrate according to the present invention includes at least two spaced-apart planar portions and a support member that supports the planar portion, and the planar shape. The planar portion is arranged so that seawater can easily flow into the gap between the portions and hardly flow out when the flow direction is reversed, and a stagnant region and a light shielding region are formed in at least a part between the planar portions. The planar portion is composed of a curved surface portion having a convex surface and a concave surface, and the staying region and the light shielding region are formed by entering at least a part of the other convex surface into one concave surface side of the curved surface portion. Features.

  According to this coral breeding base, the planar portion serves as a substrate for causing the coral planula larvae to settle, and when installed in the sea, it is in a certain direction with respect to the gap formed between the spaced planar portions. When the larva also flows in along with the flow and the flow is reversed, it is difficult for the flow from the direction opposite to the fixed direction to flow in. The coral larvae are less likely to be washed away, and are more likely to settle on the substrate of the planar portion. Moreover, by forming a light-shielding area between the planar portions, it is possible to effectively obtain the light-shielding necessary for the growth of a biological film such as lime red algae, and contribute to the promotion of larval settlement.

  In the coral breeding base, it is preferable that the planar portion is configured to be detachable from the support member. By removing the planar portion from the support member, it is possible to move to another sea area when the larvae that have grown on the substrate have grown to some extent, and a new planar portion can be attached.

Incidentally, the planar portion, when configuring the planar portion, at least a part of the flat portion is the stagnation zone and the light shielding region by inclined is formed is preferable. Since at least a part of the flat portion is inclined and overlapped, the staying area and the light shielding area can be efficiently formed. In addition, since the flat portion is a vertical surface or an inclined surface, adverse effects on larval settlement due to accumulation of red soil or the like can be avoided, and larval settlement can be promoted. The planar portion can be formed of a flat plate shape or a substantially semi-polygonal pyramid shape at least partially inclined.

In addition, the planar portion is composed of a curved surface portion having a convex surface and a concave surface, and at least a part of the other convex surface enters one concave surface side of the curved surface portion, thereby forming the stay region and the light shielding region. more bets against clearance and a concave curved surface portion of the convex surface and the adjacent curved surface portion is formed to overlap, easily flows flow from a constant direction, larvae also flows with the flow, when the flow is reversed, a certain Since the flow from the direction opposite to the direction is less likely to flow in, a staying area can be formed efficiently, and coral larvae are less likely to flow in this staying area, and it is easy to grow on convex and concave substrates. In addition, the convex and concave surfaces overlap and the light-shielding area is efficiently formed, so that the light-shielding necessary for the growth of biofilms such as lime red algae can be effectively obtained, contributing to the promotion of larval settlement. it can. Furthermore, since each convex surface and each concave surface become vertical surfaces or inclined surfaces, adverse effects on larval settlement due to accumulation of red soil or the like can be avoided, and larval settlement can be promoted.

Moreover , it is preferable to arrange the curved surface portions so that the respective convex surfaces are directed in substantially the same direction, whereby a gap between the convex surface and the concave surface can be efficiently formed. Alternatively, it is preferable to arrange the curved surface portions so that the direction of each convex surface gradually changes to form an arc shape such as a circular shape or an oval shape, or an arc shape such as a semicircular shape. A gap can be formed efficiently. Moreover, it is preferable that the said curved surface part is a substantially half dome shape or a substantially half cone shape, and is supported by the said supporting member in the half part made into the substantially half. In this case, the support member can be configured in a plate shape, the half-shaped curved surface portions can be arranged on the plate, and the plate-like support member can be placed on the seabed.

The second coral breeding base according to the reference example includes a central dome portion having a substantially dome shape, a curved surface portion having a convex surface and a concave surface, and a support member that supports the central portion and the curved surface portion. The member is characterized in that the central dome portion and the curved surface portion are arranged such that at least a part of the convex surface of the central dome portion enters the concave surface of the curved surface portion to form a staying area and a light shielding area.

  According to this coral breeding base, the convex surface of the central dome and the concave surface of the curved surface become a substrate for causing the coral planula larvae to grow, and when installed in the sea, the convex surface of the central dome and the concave surface of the curved surface portion. It is easy for flow from a certain direction to flow into the gap formed by overlapping, and larvae also flow along with the flow. When the flow is reversed, the flow from the direction opposite to the fixed direction is difficult to flow in. The area can be formed efficiently, and the coral larvae are less likely to be washed away in the staying area, and the area tends to settle on the convex and concave surfaces. Moreover, the convex surface and the concave surface are overlapped to form a light shielding area, so that the light shielding necessary for the growth of a biological film such as lime red algae can be effectively obtained, which can contribute to the promotion of larval settlement. Furthermore, since the convex surface of the central dome part and the concave surface of the curved surface part can be a vertical surface or an inclined surface, it is possible to avoid adverse effects on the larval settlement due to the accumulation of red soil, etc., and to promote the larval settlement. Can do.

  In the coral breeding base, the curved surface portion is preferably configured to be detachable from the support member. By removing the curved surface portion from the support member, it is possible to move to another sea area when the larvae that have grown on the substrate have grown to some extent, and a new curved surface portion can be attached.

  In addition, it is preferable to arrange | position the some said curved surface part around the said center dome part, and, thereby, the clearance gap which forms a stay area and a light-shielding area can be formed efficiently. Moreover, it is preferable that the said curved surface part is a substantially half dome shape or a substantially half cone shape, and is supported by the said supporting member in the half part made into the substantially half. In this case, the support member can be configured in a plate shape, the half-shaped curved surface portions can be arranged on the plate, and the plate-like support member can be placed on the seabed.

A third coral breeding base according to the reference example includes a substantially dome-shaped dome portion having a convex surface and a concave surface, and a support member that supports the dome in the vicinity of the top of the dome, and the support member includes the dome portion. At least two of the dome portions are arranged so that at least a part of the other convex surface enters one concave surface side of the dome portion to form a staying area and a light shielding area.

  According to this coral breeding base, the convex surface and concave surface of the dome portion serve as a substrate for causing the coral planula larvae to grow, and when installed in the sea, the convex surface of the dome and the concave surface of the adjacent dome portion overlap. It is easy for flow from a certain direction to flow into the gap that is formed, and larvae also flow along with the flow, and when the flow is reversed, it is difficult for flow from the opposite direction to flow, so the staying area is efficiently Coral larvae are less likely to be washed away in this staying zone, and are easy to settle on convex and concave substrates. Moreover, the convex surface and the concave surface are overlapped to form a light shielding area, so that the light shielding necessary for the growth of a biological film such as lime red algae can be effectively obtained, which can contribute to the promotion of larval settlement. Moreover, since each convex surface and each concave surface become a vertical surface or an inclined surface, it is possible to avoid an adverse effect on the larval settlement due to accumulation of red soil or the like, and to promote the larval settlement. Furthermore, since the support bar can be installed upright on the seabed, the installation area is small, and it is possible to greatly secure the larval settlement surface with a small occupied area.

  In the coral breeding base, it is preferable that the dome portion is detachable from the support member. By removing the dome part from the support member, it becomes possible to move to another sea area when the larvae that have grown on the substrate have grown to some extent, and a new dome part can be attached.

  In addition, the support member is preferably configured in a rod shape so as to penetrate and support a hole formed in the dome portion. The concave surface of the dome portion can be arranged so as to face upward, the light shielding area can be efficiently formed on the convex surface facing the lower side opposite to the concave surface, there is no accumulation of red soil, and larvae I can settle. Or, the convex surface of the dome portion can be arranged so as to face upward, the light-shielding area can be efficiently formed on the concave surface facing the lower side opposite to the convex surface, there is no accumulation of red soil, and larvae I can settle.

The fourth coral breeding base according to the reference example has a flat portion and a hollow polygonal column shape or a hollow cylindrical shape so that a staying area is formed therein, and has a hole on a side surface substantially upright from the flat portion. And a bowl-shaped part.

  According to this coral breeding base, the side surface and flat surface of the inner surface of the cocoon part serve as a substrate for causing the coral planula larvae to settle, and when installed in the sea, the flow flows into the cocoon part from the hole. A part that becomes easy to flow and a part that makes it difficult to flow in are formed, and larvae also flow into the part that makes it easy to flow in, and when the flow is reversed, a stagnant area is efficiently formed in the part that becomes difficult to flow in The coral larvae are less likely to be washed away in this staying area, and the coral larvae are more likely to settle on the inner side surface or the flat surface. Moreover, by forming a light-shielding area on the inner surface, it is possible to effectively obtain the light-shielding necessary for the growth of biological films such as lime red algae, and contribute to the promotion of larval settlement. Furthermore, since the side surface is a substantially vertical surface, adverse effects on larval settlement due to accumulation of red soil or the like can be avoided, and larval settlement can be promoted.

  It is preferable that the coral breeding base includes a support rod for supporting the saddle-type portion, and the support rods are stacked so as to pass through substantially the center of the saddle-type portion. In this case, since the support rod can be installed almost upright on the seabed, it is possible to greatly secure the larval settlement surface with a small occupied area. In addition, when stacking the plurality of saddle-shaped portions, the flat portion can constitute a bottom surface. A shading area can be efficiently formed on the downward surface opposite to the bottom surface, and there is no accumulation of red soil and larvae can be established. Alternatively, when the plurality of bowl-shaped parts are stacked, the flat part can constitute a ceiling part. In this case, a light shielding area can be efficiently formed on the downward surface of the ceiling part, and there is no accumulation of red soil or the like. , Larvae can settle. Moreover, when the said hook-shaped part is a polygonal column shape, it is preferable to have the said hole in each side surface. In this case, the plurality of saddle-shaped portions can be configured so as to be planarly arranged on the support member with the respective side surfaces being abutted so that the respective holes communicate with each other.

  Note that a support member that supports the saddle member may be provided, and the plurality of saddle members may be arranged on the support member in a planar manner. In this case, the support member can be configured in a plate shape, the saddle-shaped portions can be arranged on the plate, and the plate-like support member can be placed on the seabed.

  Moreover, it is preferable that the said hook-shaped part is detachable with respect to the said supporting member or the said support rod. By removing the saddle-shaped portion from the support member or the support rod, it becomes possible to move to another sea area when the larvae grown on the substrate have grown to some extent, and a new saddle-shaped portion can be attached.

The fifth coral breeding base according to the reference example has a base portion configured in a substantially L shape, side wall portions disposed on both sides of the base portion, and extends between the side wall portions apart from the base portion. And a plurality of rod-shaped portions arranged so as to form a staying area and a light shielding area.

  According to this coral breeding base, the periphery of the rod-shaped portion, the inner surface of the side wall portion, the inner surface of the base portion becomes a substrate for causing the coral planula larvae to settle, and when installed in the sea, by a plurality of rod-shaped portions, Around the rod-shaped part, the inner surface of the side wall part, and the inner surface of the base part, a part where the flow easily flows from the outside and a part where the flow becomes difficult to flow in are formed. However, when the flow is reversed, it is possible to efficiently form a staying area in a portion where it is difficult to flow in. In this staying area, it is difficult for coral larvae to flow, and the periphery of the rod-like part, the inner surface of the side wall part and the base It becomes easy to settle on the inner surface of the part. Moreover, since the light-shielding area is formed by the plurality of rod-shaped portions, it is possible to effectively obtain the light-shielding necessary for the growth of the biofilm such as lime red algae, and to contribute to the promotion of larval settlement. Furthermore, since the periphery of the rod-shaped portion, the inner surface of the side wall portion, and the inner surface of the base portion are vertical surfaces or inclined surfaces, adverse effects on the larval settlement due to accumulation of red soil and the like can be avoided, and the larval settlement is promoted. be able to.

  In the coral breeding base, one of the both side walls can be omitted. Further, a plurality of the above-mentioned fifth coral breeding bases can be combined to constitute a coral breeding base.

  The coral breeding method according to the present invention is characterized in that the above-mentioned coral breeding base is installed in the sea, and a staying area and a light shielding area are formed in the coral breeding base.

  According to this coral breeding method, by installing the above-mentioned coral breeding base in the sea, in the coral breeding base, a part where the flow easily flows from the outside and a part where the flow becomes difficult to flow are formed. When the larvae also flow into the easy-to-inflow part and the flow is reversed, a stagnant area can be efficiently formed in the part where the inflow is difficult, and the coral larvae are not easily washed away in this stagnant area. , Easy to settle on the coral breeding base. In addition, the formation of the light-shielding area can effectively obtain the light-shielding necessary for the growth of a biological film such as lime red algae, and can promote the larval settlement.

  In the coral breeding method, the coral breeding base is preferably installed in the sea so that a vertical surface or a slope is formed by the coral breeding base. The slope includes a downward surface such as a ceiling surface. Accordingly, since a vertical surface or a slope is formed on the coral breeding base, adverse effects on larval settlement due to accumulation of red soil or the like can be avoided, and larval settlement can be promoted. Further, since the coral breeding base can have a ceiling or a downward surface, a light-shielding area can be efficiently formed, red soil or the like is not deposited, and larval settlement can be promoted.

  In the present specification, light shielding means at least partially shielding sunlight incident through seawater on a substrate for coral multiplication.

  According to the coral breeding base and the coral breeding method of the present invention, coral larvae can be efficiently grown at low cost and can be proliferated by sexual reproduction.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  <First Embodiment>

  FIG. 1 is a plan view schematically showing a coral breeding base according to the first embodiment. FIG. 2 is a side view schematically showing the coral breeding base of FIG. FIG. 3 is a plan view of the support plate for the coral breeding base shown in FIGS. 4 is a cross-sectional view of the support plate of FIG. 3 taken along the line IV-IV. FIG. 5 is a perspective view schematically showing the coral breeding base of FIG. 1 and FIG. 2 (the number of half dome portions is reduced as compared with FIG. 1).

  As shown in FIGS. 1 to 5, the coral breeding base 10 is a base for efficiently growing coral larvae, and has a rectangular plate-like support plate 11 and a support plate as a curved surface portion (plane-like portion). And a plurality of half dome portions 12 attached to and supported by 11.

  As shown in FIGS. 1, 2, and 5, each half dome portion 12 has a shape obtained by halving a dome-shaped object having a predetermined thickness t along the central axis direction. It is supported on the support plate 11 by a semicircular half portion 12a (indicated by a broken line in FIG. 4).

  When the half dome portion 12 is supported by the support plate 11 as shown in the figure, the half dome portion 12 has a convex surface 14 located on the outside as a convex curved surface and a concave surface 15 located on the inside as a concave curved surface. The convex surface 14 and the concave surface 15 serve as a substrate for causing the coral planula larvae to grow.

  As shown in FIGS. 4 and 5, a plurality of substantially semicircular grooves 13 corresponding to the shape of the half portion 12 a of the half dome portion 12 are formed in the support plate 11 on the flat surface 11 a. . As shown by a broken line in FIG. 4, the semi-dome portion 12 is fitted to the support plate 11 by being fitted into a substantially semicircular groove 13 from a substantially semicircular half portion 12 a. The half dome portion 12 attached to the substantially semicircular groove 13 can be removed from the groove 13 by being pulled out.

  When the plurality of half dome portions 12 are attached to the support plate 11, the convex surfaces 14 are arranged so as to be aligned in a line in a certain direction A as shown in FIGS. 1, 2, and 5. When at least a part of the convex surface 14 of the half dome portion 12 enters the concave surface 15 of another adjacent half dome portion 12, the convex surface 14 and the concave surface 15 partially overlap with each other. Thereby, a gap 19 is formed between the convex surface 14 and the concave surface 15 in the vicinity of the apex of the half dome portion 12, and an intra-substrate space D is formed inside the substrate between the convex surface 14 and the concave surface 15.

  The support plate 11 of the coral breeding base 10 can be made of concrete or ceramic. The half dome portion 12 can be formed from a resin by molding, or may be formed from ceramic, concrete, or a metal plate. When the support plate 11 is made of concrete, the semi-dome portion 12 may be inserted into the concrete to form a plurality of substantially semicircular grooves 13 shown in FIG.

  According to the coral breeding base 10 shown in FIGS. 1 to 5, since it can be easily constructed from the support plate 11 and the plurality of half dome parts 12, it can be manufactured at a low cost, and when installed in the sea, FIG. 2, the diversion of the oscillating flow caused by the wave flows from the constant direction A and easily enters the in-substrate space D from the gap 19 between the convex surface 14 and the concave surface 15 as in the flowing direction C. The larvae also flow in, and when the diversion reverses in the direction B opposite to the constant direction A, the structure is difficult to flow out from the space D in the substrate. For this reason, as shown in FIG. 2, in the space D in the substrate, a staying area 16 where the flow is stagnated is formed on the convex face 14 covered with the concave face 15, and a staying area 17 where the flow is stagnating is formed on the concave face 15. Since the larvae are less likely to be washed away from the areas 16 and 17 and the vicinity thereof, the larvae are likely to settle on the concave surfaces 15 and the convex surfaces 14 of the stay areas 16 and 17.

  The coral breeding base 10 is a structure in which the convex surface 14 and the concave surface 15 of each half dome portion 12 are installed in the sea as vertical or inclined surfaces, so that red soil or the like is not easily deposited on the surfaces of the convex surface 14 and the concave surface 15. The adverse effects of red soil accumulation can be avoided.

  Moreover, since the concave surface 15 faces downward and the convex surface 14 is partially covered by the adjacent half dome portion 12 in the space D in the substrate of the half dome portion 12 to form an appropriate light shielding area, lime red algae, etc. The light shielding necessary for the growth of the biofilm can be effectively obtained.

  Moreover, since each half dome part 12 can be removed from the support plate 11, it can be moved to another sea area when the larvae that have grown on the substrate have grown to some extent. The part 12 can also be attached to the support plate 11.

  Next, another example of the first embodiment will be described with reference to FIG. FIG. 23 is a side view schematically showing a coral breeding base of another example of the first embodiment.

  The coral breeding base 10 ′ in FIG. 23 is a base for efficiently growing coral larvae, and is disposed and attached to the support plate 11 having a rectangular plate shape and the support plate 11 as a planar portion. A plurality of flat plate portions 18. Each flat plate portion 18 has substantially flat double-sided surfaces 18a and 18b serving as a substrate for causing the growth of coral planula larvae.

  Each flat plate portion 18 is attached so as to be inclined from the vertical direction of the surface 11a of the support plate 18, and both surfaces are an outer surface 18a facing upward and an inner surface 18b facing downward. On the surface 11a of the support plate 11, linear grooves 13a into which a plurality of flat plate portions 18 can be fitted are formed as shown by broken lines in FIG. 23, and each flat plate portion 18 is fitted with an end portion into the groove 13a. It is attached to the support plate 11 and can be removed from the groove 13a by being pulled out. In FIG. 23, the entire flat plate portion 18 is inclined. However, for example, the lower portion may be erected and the upper portion may be inclined.

  As shown in FIG. 23, the plurality of flat plate portions 18 are arranged so that the outer side surfaces 18a are inclined so as to fall in the direction B and are aligned in a line, and are partially overlapped with the adjacent outer side surface 18a. A gap 19a is formed between the inner surface 18b and the adjacent outer surface 18a, and a substrate inner space D is formed inside the substrate between the inner surface 18b and the adjacent outer surface 18a.

  According to the coral breeding base 10 ′ of FIG. 23, since it can be easily configured from the support plate 11 and the plurality of flat plate portions 18, it can be manufactured at low cost, and when installed in the sea, as shown in FIG. The diversion of the oscillating flow caused by the wave flows from the constant direction A and easily enters the intra-substrate space D as in the flow direction C from the gap 19a, and the larvae also flow in at this entering stage, and the diversion flows in the direction B opposite to the constant direction A. When reversed, the structure is difficult to flow out from the space D in the substrate. For this reason, in the space D in the substrate, a staying area 18c where the flow is stagnated is formed particularly on the lower side surface 18b, and larvae are less likely to flow from the staying area 18c and the vicinity thereof. It becomes easy to do.

  Moreover, since a moderate light-shielding area is formed by the inclination of each flat plate portion 18 in the intra-substrate space D, it is possible to effectively obtain the light-shielding necessary for the growth of biological films such as lime red algae. Further, the coral breeding base 10 ′ is installed in the sea with the flat plate portion 18 as an inclined surface, so that red soil or the like is difficult to deposit on the surface of the flat plate portion 18, and adverse effects due to red soil accumulation can be avoided. . The flat plate portion 18 can be made of resin, ceramic, concrete, metal plate or the like.

  Next, with reference to FIGS. 6 and 7, two modified examples of the coral breeding bases of FIGS. 1 to 5 will be described. FIG. 6 is a perspective view schematically showing a coral breeding base in which the half dome part of the coral breeding base of FIG. FIG. 7 is a plan view schematically showing a coral breeding base in which a number of the half dome parts of FIGS. 1 to 5 are arranged on the circumference.

  The coral breeding base 10A shown in FIG. 6 has a plurality of substantially semi-conical portions 12A that are cut at the tip and formed in half along the central axis direction instead of the half dome portion shown in FIG. They are arranged in a line in the direction. The plurality of substantially semi-conical portions 12A, at least part of the convex surface 14A enters the adjacent concave surface 15A, and the convex surface 14A and the concave surface 15A overlap to form a retention portion in the same manner as in FIG. It has the same effect.

  FIG. 7 shows that the plurality of half dome portions 12 of FIGS. 1 to 5 gradually change the direction of the convex surface 14 so that at least a part of the convex surface 14 enters the adjacent concave surface 15 so that the convex surface 14 and the concave surface 15 overlap each other. It is arranged in an annular shape. As a result, a staying portion is formed in the same manner as in FIG. 2, and the same effects as in FIGS. 1 to 5 are achieved.

  In FIG. 7, the plurality of half dome portions 12 are arranged at the same intervals over the entire circumference, but may be arranged by changing the intervals partially on the circumference. Further, the arrangement form is not limited to an annular shape, and may be an arc shape such as an oval shape or a semicircular shape.

  <Second Embodiment>

  FIG. 8 is a plan view schematically showing a coral breeding base according to the second embodiment. FIG. 9 is a side view schematically showing the coral breeding base of FIG. FIG. 10 is a perspective view schematically showing the coral breeding base shown in FIGS.

  As shown in FIGS. 8 to 10, the coral breeding base 20 is a base on which coral larvae are efficiently grown, and is supported by a substantially square plate-like support plate 21 and a substantially center of the support plate 21. A central dome portion 23 having a substantially dome shape having a convex curved surface 24 on the outer surface, and a plurality of half dome portions disposed around the central dome portion 23 and supported by being attached to the support plate 21 as curved surface portions. 22.

  Each half dome portion 22 has a shape obtained by halving a dome-shaped object having a predetermined thickness t, similar to the half dome portion 12 of FIGS. 1, 2, and 5. It is supported on the support plate 21 by a circular half part (similar to the half part 12a shown by a broken line in FIG. 4).

  When the half dome portion 22 is supported by the support plate 21 as shown in FIG. 9, the convex surface 26 positioned as a convex curved surface on the outer side and the concave surface 25 positioned as a concave curved surface on the inner side. The concave surface 25 together with the convex surface 24 of the central dome 23 serves as a substrate for causing the coral planula larvae to grow.

  4 and 5, a plurality of substantially semicircular grooves corresponding to the shape of the half of the half dome portion 22 are formed in the support plate 21, and the half dome portion 22 is substantially semicircular. It is fitted to the support plate 21 by being fitted into a substantially semicircular groove from the half-shaped portion. In addition, the half dome part 22 attached to the substantially semicircular groove | channel can be removed from a groove | channel by pulling out.

  When the plurality of half dome portions 22 are attached to the support plate 21 so as to surround the central dome portion 23, at least a part of the convex surface 24 of the central dome portion 23 is formed in each half dome portion as shown in FIGS. 8 to 10. By entering the concave surface 25 of 22, the convex surface 24 and the concave surface 25 partially overlap with each other. Thereby, a gap 29 is formed between the convex surface 24 and the concave surface 25 in the vicinity of the apex of the half dome portion 22, and an intra-substrate space D is formed inside the substrate between the convex surface 24 and the concave surface 25.

  The support plate 21 of the coral breeding base 20 can be made of concrete or ceramic. The half dome portion 22 and the central dome portion 23 can be made by molding from resin, and may be made from ceramic, concrete, or a metal plate. When the support plate 21 is made of concrete, the semi-dome portion 22 may be inserted into the concrete to form a plurality of substantially semicircular grooves.

  According to the coral breeding base 20 shown in FIGS. 8 to 10, the support plate 21, the central dome portion 23, and the plurality of half dome portions 22 can be easily configured, so that they can be manufactured at low cost and installed in the sea. Then, as shown in FIG. 9, the diversion of the oscillating flow caused by the waves flows from the constant directions E and E ′ and easily enters the in-substrate space D as indicated by the direction G from the gap 29 between the convex surface 24 and the concave surface 25. At this entry stage, larvae also flow in, and when the diversion is reversed in the opposite directions F and F ′ of the constant directions E and E ′, the structure is difficult to flow out of the in-substrate space D. For this reason, in the in-substrate space D, as in FIG. 2, a staying area 27 stagnating the flow is formed on the convex surface 24 covered with the concave face 25, and a staying area 28 stagnating the flow is formed on the concave face 25. Since larvae are less likely to flow from the areas 27 and 28 and the vicinity thereof, the larvae are likely to settle on the concave surfaces 25 and the convex surfaces 24 of the retention areas 27 and 28.

  Since the convex surface 24 of the central dome portion 23 and the concave surface 15 of each half dome portion 22 are installed in the sea as a vertical surface or a slope, the coral breeding base 20 is deposited on the surfaces of the convex surface 24 and the concave surface 25. This structure is difficult to avoid, and the adverse effects of red soil accumulation can be avoided. Further, since the concave surface 25 of the half dome portion 22 faces downward and the convex surface 24 of the central dome portion 23 is partially covered by the half dome portion 22 in the substrate space D, an appropriate light shielding area is formed. Light shielding necessary for the growth of biofilms such as lime red algae can be effectively obtained.

  Moreover, since each half dome part 22 can be removed from the support plate 21, it can be moved to another sea area when the larvae that have grown on the substrate have grown to some extent. The part 22 can also be attached to the support plate 21.

  <Third Embodiment>

  FIG. 11 is a side view (a) and a plan view (b) showing a portion of the coral breeding base according to the third embodiment. FIG. 12 is a side view schematically showing a coral growth base according to the third embodiment.

  As shown in FIGS. 11 and 12, the coral breeding base 30 is a base for efficiently growing coral larvae, and a round bar-like support bar 31 and a support bar 31 are penetrated and supported. A plurality of dome portions 32 having a substantially dome shape having a convex surface 34 having a convex curved surface on the outer surface and a concave surface 35 having a concave curved surface on the inner surface.

  As shown in FIGS. 11 (a) and 11 (b), the dome portion 32 has a bowl shape, and includes a reinforcing portion 33 having a center hole 33a protruding to the outer bottom and penetrating through the center, and a support rod in the center hole 33a. 31 is penetrated, and the convex surface 34 and the concave surface 35 serve as a substrate for causing the coral planula larvae to grow.

  As shown in FIG. 12, the coral breeding base 30 has the concave surface 35 on the upper side and the dome portion 32 is sequentially inserted into the support rod 31, and at least one convex surface 34 of the dome portion 32 is a concave surface of the adjacent dome portion 32. 35 is attached and supported so as to enter. The dome part 32 can be pulled out from the support bar 31 and removed.

  The dome portion 32 has a convex surface 34 facing downward and a concave surface 35 facing upward, and is partially overlapped with the convex surface 34 and the concave surface 35 spaced apart, so that the periphery of the open end surface of the concave surface 35 (the upper end in FIG. 12) A gap 39 is formed between the convex surface 34 and the upper convex surface 34, and an intra-substrate space D is formed in the substrate between the convex surface 34 and the concave surface 35.

  The support rod 31 of the coral breeding base 30 can be made of a metal such as steel or a resin. The dome portion 32 can be made from resin by molding, and may be made from ceramic, concrete, or a metal plate.

  11 and 12, the coral breeding base 30 can be easily constructed from the support bar 31 and the plurality of dome parts 32. Therefore, it can be manufactured at a low cost, and for example, the support bar 31 is pierced substantially upright on the seabed. Installed, the diversion flow of the oscillating flow caused by the wave flows from a certain direction and easily enters the substrate space D from the gap 29 between the convex surface 34 and the concave surface 35. When inverted in a direction opposite to a certain direction, the structure is difficult to flow out from the substrate space D. For this reason, in the in-substrate space D, a stay area 37 where the flow is stagnated is formed on the concave surface 35 covered with the convex face 34, and a stay area 36 where the flow is stagnated is formed on the inclined or downward convex face 34. , 37 and the vicinity thereof, it becomes difficult for larvae to flow, so that the larvae are likely to settle on the convex surfaces 34 and the concave surfaces 35 of the staying areas 36 and 37.

  The coral breeding base 30 is installed in the sea with the convex surface 34 and the concave surface 35 of the dome part 32 as vertical surfaces, inclined surfaces, or downward surfaces, so that red soil or the like is not easily deposited on the surfaces of the convex surface 34 and the concave surface 35. Therefore, adverse effects due to red soil accumulation can be avoided. Further, since the convex surface 34 of the dome portion 32 faces downward and most of the concave surface 35 is covered by the upper dome portion 32 in the in-substrate space D, an appropriate light shielding area is formed. The light shielding necessary for the growth of the biofilm can be effectively obtained.

  Further, since the dome portion 32 can be detached from the support rod 31, it can be moved to another sea area when the larvae that have grown on the substrate have grown to some extent, and the new dome portion 32 is supported. It can also be attached to the rod 31.

  Moreover, since the coral breeding base 30 is formed by stacking a plurality of dome portions 32 in the vertical direction, the installation area is small, and it is possible to greatly secure the larval settlement surface with a small occupied area. is there.

  Next, two examples of modification of the third embodiment will be described with reference to FIGS. FIG. 13 is a side view schematically showing another example of the coral breeding base of FIG. FIG. 14 is a plan view schematically showing an example in which a plurality of coral breeding bases shown in FIG. 12 are arranged in a plane.

  The coral breeding base 30A of FIG. 13 has the same structure as that of FIG. 12 except that the plurality of dome portions 32 are arranged so that the convex surface 34 faces upward and the concave surface 35 faces downward. In D, a stagnant region 36A where the flow is stagnated is formed on the convex surface 34 covered with the concave surface 35, and a stagnant region 37A where the flow is stagnant is formed on the inclined or downward concave surface 35, and the same effects as in FIG. .

  The coral breeding bases 30 and 30A shown in FIGS. 12 and 13 are installed in a substantially vertical direction with respect to the seabed. However, the present invention is not limited to this. You may install in.

  In the example shown in FIG. 14, a plurality of coral breeding bases 30 in FIG. 12 are installed so as to be inserted into the seabed in a substantially vertical direction. According to this, it is possible to greatly secure the larval settlement surface with a small occupied area. 13 can also be installed in the same manner as in FIG. 14 and may be mixed with the coral breeding base 30. FIG.

  <Fourth embodiment>

  FIG. 15 is a side view (a) and a plan view (b) showing a coral growth base according to the fourth embodiment.

  As shown in FIGS. 15 (a) and 15 (b), the coral breeding base 40 is a base for efficiently growing coral larvae, and the hollow portion 49 is formed so that a staying area is formed therein. A saddle-shaped portion 41 having a pentagonal columnar shape is provided, and the saddle-shaped portion 41 includes five side surfaces 42 forming a pentagon and a pentagon-shaped bottom surface 45 having a hole 45a in the center. Each side surface 42 has a hole 43 in the middle in the height direction.

  15 (a) and 15 (b), the coral breeding base 40 can be easily configured from the saddle-shaped portion, so that it can be manufactured at low cost, and the inner wall surface 44 of each side surface 42 of the saddle-shaped portion 41 and The bottom surface 45 serves as a substrate for causing the coral planula larvae to grow, and when installed in the sea, the flow easily flows into the hollow portion 49 of the bowl-shaped portion 41 from the hole 43 and the flow hardly flows. The stagnation region 47, 48 can be efficiently formed in the part where it becomes difficult to flow in when the larva also flows in along with the flow into the part that becomes easy to flow in. Coral larvae are less likely to be washed away at 47 and 48, and the coral larvae 41 are easily deposited on the inner wall surface 44 and the bottom surface 45. Moreover, since the light shielding area is formed on the inner wall surface 44, the light shielding necessary for the growth of a biofilm such as lime red algae can be effectively obtained, which can contribute to the promotion of larval settlement. Furthermore, since the wall surface 44 is a substantially vertical surface, adverse effects on larval settlement due to accumulation of red soil or the like can be avoided, and larval settlement can be promoted.

  The coral breeding base 40 can be made of resin, ceramic, concrete, metal plate or the like.

  Next, three examples of modification of the fourth embodiment will be described with reference to FIG. 16, FIG. 17, and FIG. FIG. 16 is a side view schematically showing another example of the coral breeding base of FIG. FIG. 17 is a side view schematically showing another example of the coral breeding base of FIG. FIG. 18 is a plan view schematically showing an example in which a plurality of coral breeding bases shown in FIG.

  In the coral breeding base 40A of FIG. 16, the plurality of saddle-shaped portions 41 of FIGS. 15 (a) and 15 (b) are sequentially inserted into the support rods 46 from the holes 45a of the bottom surface 45 with the hollow portions 49 facing upward. It is configured. The saddle-shaped part 41 can be pulled out from the support bar 46 and removed.

  In the coral breeding base 40B of FIG. 17, the plurality of saddle-shaped portions 41 of FIGS. 15 (a) and 15 (b) are sequentially provided with holes 45a in the bottom surface (upper surface) 45 on the support rod 46 with the hollow portion 49 on the lower side. It is made up of plugged in. The saddle-shaped part 41 can be pulled out from the support bar 46 and removed.

  According to the coral breeding bases 40A and 40B shown in FIGS. 16 and 17, since the support rod 46 and the plurality of saddle-shaped portions 41 can be simply configured, they can be manufactured at a low cost. A downward surface opposite to the wall surface 44 and the bottom surface 45 and the ceiling surface 45 (FIG. 17) serve as a substrate for causing the coral planula larvae to grow, and when installed in the sea, A portion where the flow easily flows in from the hole 43 and a portion where the flow is difficult to flow in are formed, and the larva also flows into the portion where the flow easily flows and stays in the portion where the flow is difficult to flow when the flow is reversed. The areas 47A, 48A, 47B, 48B, and 49A can be efficiently formed, and the coral larvae are less likely to be washed away in each staying area. It becomes easy to settle. In addition, since a plurality of bowl-shaped portions 41 are stacked in the hollow portion 49 to form a light shielding area, it is possible to effectively obtain the light shielding necessary for the growth of a biological film such as lime red algae, so that the larvae grow. Can contribute to promotion. Furthermore, since the wall surface 44 becomes a substantially vertical surface and the surface opposite to the bottom surface 45 and the ceiling surface 45 face downward, it is possible to avoid adverse effects on the larval settlement due to the accumulation of red soil and the like. Can promote life.

  In addition, since the coral breeding bases 40A and 40B are obtained by stacking a plurality of bowl-shaped portions 41 in the vertical direction, the installation area is small, and a large larvae settlement surface is ensured with a small occupied area. Is possible.

  A coral breeding base 40C shown in FIG. 18 is obtained by planarly arranging a plurality of coral breeding bases 40 including the bowl-shaped portions 41 shown in FIG. 15 on the support plate 46A. One side face 42 of the saddle-shaped part 41 and one side face 42 of the adjacent saddle-shaped part 41 are arranged to face each other, the holes 43 of each one side face 42 communicate with each other, and the hollow parts 49 communicate with each other. Each saddle type portion 41 can be detached from the support plate 46A and attached.

  According to the coral breeding base 40C of FIG. 18, the same effects as those of FIG. 15 can be obtained, and the hollow portions 49 communicate with each other through the holes 43, so that a staying area can be formed more efficiently inside.

  <Fifth embodiment>

  FIG. 19 is a plan view showing a coral breeding base according to the fifth embodiment. 20 is a view of the coral breeding base of FIG. 19 as viewed from the side.

  As shown in FIGS. 19 and 20, the coral breeding base 50 includes a plate-like base portion 51 configured in a substantially L shape, plate-like side wall portions 53 disposed on both sides of the base portion 51, and a base. And a plurality of rod-like parts 52 arranged to extend from both side wall parts 53 away from the part 51 to form a staying area.

  19 and 20 is a round bar, it may be a square bar or the like. Further, the side wall 53 has a triangular shape as shown in FIG. 20, but may have a quadrangular shape, or one of the side walls 53 may be omitted.

  19 and 20, the coral multiplication base 50 can be easily configured from the base portion 51, the side wall portion 53, and the plurality of rod-like portions 52, and can be manufactured at a low cost. The inner surface 53a of the side wall 53 and the inner surface 51a of the base portion 51 serve as a substrate for causing the coral planula larvae to grow, and when installed in the sea, a plurality of the rod-shaped portions 52 surround the rod-shaped portion 52. On the inner surface of 53 and the inner surface of the base portion 51, a portion where the flow easily flows from the outside and a portion where the flow becomes difficult to flow are formed, and the larva also flows into the portion where the flow easily flows and the flow is reversed. Then, the staying area 56 and the staying area 57 on the inner surface of the base part 51 can be efficiently formed around the rod-like part 52 at the part where it is difficult to flow in, and coral larvae flow in the staying areas 56 and 57. It becomes hard, easily epiphytic inner surface 51a of the inner surface 53a and the base portion 51 of the peripheral or side wall portion 53 of the rod portion 52.

  Moreover, since the light shielding area is partially formed around the rod-shaped part 52 and the inner surfaces 53a and 51a by the plurality of rod-shaped parts 52, it is possible to effectively obtain the light shielding necessary for the growth of a biofilm such as lime red algae. Can contribute to the promotion of larval settlement.

  Further, since the periphery of the rod-shaped portion 52, the inner surface 53a of the side wall portion 53, and the inner surface 51a of the base portion 51 are vertical surfaces or inclined surfaces, adverse effects on larvae settlement due to accumulation of red soil can be avoided. Can promote life.

  The base portion 51, the rod-like portion 52, and the side wall portion 53 can be made of resin, ceramic, concrete, metal plate, or the like.

  Next, an example in which a plurality of coral breeding bases 50 shown in FIGS. 19 and 20 are combined to form a coral breeding base assembly will be described with reference to FIG.

  FIG. 21 is a perspective view showing a coral breeding base assembly configured by combining a plurality of coral breeding bases of FIGS. 19 and 20.

  As shown in FIG. 21, the coral breeding base assembly 60 is formed in a substantially cubic shape by combining a plurality of coral breeding bases 50 shown in FIGS. 19 and 20, and the coral breeding base 50 is vertically arranged at four corners. In addition to being arranged in the direction, the coral breeding bases 50 are arranged in two steps in the lateral direction so as to be separated so that a gap H is formed on each of the four surfaces.

  According to the coral breeding base assembly 60 of FIG. 21, the same effects as those of FIGS. 19 and 20 can be obtained, and the installation area can be reduced, and the larvae's settlement surface can be largely secured with a small occupied area. Is possible.

  Further, the coral breeding base assembly 60 includes a plurality of coral breeding bases 50, each having a back surface side of each base portion 51 and a back surface side of each side wall portion 53 as shown in FIG. Since it can be detachably fixed and no other special member is required, it can be constructed at low cost.

  <Sixth embodiment>

  FIG. 22 is a perspective view showing a coral breeding base assembly obtained by combining a plurality of the coral breeding bases according to the sixth embodiment.

  As shown in FIG. 22, the coral breeding base assembly 70 includes a plurality of coral breeding bases 30 in FIG. 12, a plurality of coral breeding bases 30A in FIG. 13, and a plurality of coral breeding bases 40A in FIG. Are arranged upright so as to pierce the support rods 31, 31, 46 on the rectangular support plate 71.

  In order to support the coral breeding bases 30, 30 </ b> A, 40 </ b> A, the coral breeding base assembly 70 is arranged with the vertical members 72 standing upright at the four corners of the support plate 71. The horizontal members 73 are arranged in a horizontal direction so as to be connected, and further, a plurality of horizontal members 75 and 76 are arranged vertically and horizontally in parallel with the horizontal members 73, and at each intersection 77 of the horizontal members 75 and 76 arranged vertically and horizontally. The support rods 31, 31, 46 of the coral breeding bases 30, 30A, 40A are supported at their upper ends.

  According to the coral breeding base assembly 70 of FIG. 22, the same effects as those of FIGS. 12, 13, and 16 can be obtained, and the installation area can be reduced, and the larvae's surface can be greatly increased with a small occupied area. It is possible to secure.

  As described above, according to each of the coral breeding bases 10 to 50 and the coral breeding base assemblies 60 and 70 according to the present embodiment, a structure that reduces the flow rate to form a staying area and promotes larval settlement, and red soil. In addition, it is possible to reliably obtain a structure that prevents sediment from accumulating, and a substrate structure (substrate) having an appropriate light-shielding area at a low cost, so that coral larvae can be efficiently grown at a low cost. Can contribute to the growth of sexual reproduction.

  As described above, the best mode for carrying out the present invention has been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. For example, an opening may be formed by cutting the thin end side of the half dome 12 in FIG. In FIG. 10, the half dome 12 may be further divided into two parts while maintaining the overall shape.

  15 to 18, the saddle-shaped portion 41 has a pentagonal columnar shape. However, the present invention is not limited to this, and may be a quadrangular or hexagonal shape, or may be a cylindrical body. In the case of a body, an appropriate number of holes 43 can be provided at appropriate positions so that the staying portions can be efficiently formed. Further, in FIGS. 15 to 18, in order to efficiently form the staying portion, a part of the hole 43 in each side surface 42 may be omitted, and a side surface without a hole may be provided, or a plurality of holes 43 may be provided. Furthermore, the diameter of the hole 43 can be set as appropriate.

  In addition, regarding the staying areas 16, 17, 18c, 27, 28, 36, 37, 47, 48, 47A, 48A, 47B, 48B, 56, 57 in each figure, the illustrated shapes and positions are for convenience of explanation. Therefore, it is approximate and the actual shape and position may be different.

It is a top view which shows roughly the base for coral multiplication by 1st Embodiment. It is a side view which shows roughly the base for coral multiplication of FIG. It is a top view of the support plate of the base for coral multiplication of FIG. It is sectional drawing which cut | disconnected the support plate of FIG. 3 in the IV-IV line direction. FIG. 3 is a perspective view schematically showing the coral breeding base of FIGS. 1 and 2. It is a perspective view which shows roughly the base for coral multiplication which made the half dome part of the base for coral multiplication of FIG. FIG. 6 is a plan view schematically showing a coral breeding base in which a number of the half dome parts of FIGS. 1 to 5 are arranged on the circumference. It is a top view which shows roughly the base for coral multiplication by 2nd Embodiment. It is a side view which shows roughly the base for coral multiplication of FIG. FIG. 10 is a perspective view schematically showing the coral breeding base of FIGS. 8 and 9. It is the side view (a) and top view (b) which show the part of the base for coral multiplication by 3rd Embodiment. It is a side view which shows roughly the base for coral multiplication by 3rd Embodiment. It is a side view which shows schematically another example of the base for coral multiplication of FIG. FIG. 13 is a plan view schematically showing an example in which a plurality of coral breeding bases in FIG. 12 are arranged in a plane. It is the side view (a) and top view (b) which show the base for coral multiplication by 4th Embodiment. FIG. 16 is a side view schematically showing another example of the coral breeding base of FIG. 15. FIG. 17 is a side view schematically showing another example of the coral breeding base of FIG. 16. FIG. 16 is a plan view schematically showing an example in which a plurality of coral breeding bases of FIG. 15 are arranged in a plane. It is a top view which shows the base for coral multiplication by 5th Embodiment. It is the figure which looked at the inside from the side of the base for coral multiplication of FIG. FIG. 21 is a perspective view showing a coral breeding base assembly configured by combining a plurality of coral breeding bases of FIGS. 19 and 20. It is a perspective view which shows the base assembly for coral multiplication which combined several said each base for coral multiplication by 6th Embodiment. It is a side view which shows roughly the base for coral multiplication of another example of 1st Embodiment.

Explanation of symbols

10, 10 ', 10A, 10B Coral breeding base 11 Support plate (support member)
12 Half dome (planar part, curved surface part)
12A substantially semi-conical portion 13 groove 14, 14A convex surface 15, 15A concave surface 16, 17, 18c retention area 18 flat plate portion (planar portion)
19, 19a Clearance 20 Coral breeding base 21 Support plate 22 Half dome part 23 Central dome part 24 Convex surface 25 Concave surface 27, 28 Retention area 29 Clearance 30, 30A Coral breeding base 31 Support rod 32 Dome part 33a Central hole 34 Convex surface 35 Concave surface 36, 37, 36A, 37A Retention area 39 Crevice 40, 40A, 40B, 40C Coral breeding base 41 Sponge part 42 Side surface 43 Hole 44 Wall surface 45 Bottom surface, Ceiling surface 45a Hole 46 Support rod 46A Support plate 47, 48, 47A, 48A, 47B, 48B Retention area 49 Hollow part 50 Coral breeding base 51 Base part 51a Inner surface 52 Rod-like part 53 Side wall part 53a Inner face 56, 57 Retention area 60, 70 Coral breeding base assembly 71 Support plate A Fixed direction B Reverse direction C Flow direction D Substrate space E, E 'Constant direction F , F 'Opposite direction

Claims (6)

Comprising at least two planar parts spaced apart, and a support member for supporting the planar part,
The planar portion is formed so that seawater can easily flow into the gap between the planar portions and hardly flow out when the flow direction is reversed, and a stagnant region and a light-shielding region are formed in at least a part between the planar portions. It was placed,
The planar portion is composed of a curved surface portion having a convex surface and a concave surface,
The coral breeding base , wherein the staying area and the light shielding area are formed by at least part of the other convex surface entering one concave surface side of the curved surface portion . The coral breeding base according to claim 1, wherein the planar portion is detachable from the support member. The coral growth base according to claim 1 or 2, wherein the curved surface portions are arranged so that the convex surfaces face substantially the same direction . The base for coral multiplication according to claim 1 or 2, wherein the curved surface portions are arranged so that the direction of each convex surface is gradually changed so as to be annular or arcuate . 5. The coral growth base according to claim 1, wherein the curved surface portion has a substantially half dome shape or a substantially half cone shape, and is supported by the support member at a half portion that is substantially halved. . A coral breeding method comprising: installing the coral breeding base according to any one of claims 1 to 5 in the sea, and forming a staying area and a light-shielding area in the coral breeding base.

Images