Shrimp rearing reef

Abstract

To provide a shrimp rearing reef including a space with a horizontal floor suitable for inhabitation of shrimps at each stage from larvae to adults.SOLUTION: A shrimp rearing reef 1 with a basket body 2 filled with fillers 5, includes a shrimp rearing part 3 formed by stacking approximately plate-shaped fillers 5a, with gaps 31 spaced in the vertical direction, on at least a part of an area exposed to the side surface of the basket body 2. In addition, the porosity of the shrimp growing part 3 is larger than that of a substantially central part of the basket body 2 in plan view.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a shrimp breeding reef.

Background Art

[0002] In recent years, concrete breeding reefs have been manufactured and used in actual sea areas. Also, as a reef that can be easily assembled using locally produced materials and installed at a lower budget, a snake basket in which natural stones and the like are accommodated in a mesh container made of a durable material is used (see, for example, Patent Document 1). In the snake basket, the continuous gap space formed between the stones filled in the mesh container serves as a passage for water and air, or as a hiding place or habitat for living organisms.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In normal life, shrimps and crabs are best off folding their legs and keeping their bodies horizontal to the floor. However, the gaps and spaces formed in conventional snake baskets have various shapes and are not an optimal environment for the habitation of shrimps and the like.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a shrimp breeding reef in which a space having a horizontal floor suitable for the habitation of shrimps at each stage from larvae to adults is formed.

Means for Solving the Problems

[0006] The present invention for solving the above-described problems is a cultivation fishing reef for shrimps in which a cage body is filled with a filler, and at least a part of a portion exposed on the side surface of the cage body is provided with a shrimp cultivation part in which substantially plate-shaped fillers are laminated with a gap in the vertical direction, and the porosity of the shrimp cultivation part is larger than the porosity in a substantially central part in a plan view of the cage body.

[0007] In the present invention, by laminating substantially plate-shaped fillers with a gap in the vertical direction, various-sized gaps having a horizontal floor are formed. Therefore, a space having a shape suitable for the habitation of shrimps at each stage from larvae to adults can be obtained, and in addition, a fishing reef having a place to escape from predatory animals such as octopuses and squids can be obtained.

[0008] The substantially plate-shaped filler is made of concrete, mortar, or stone, and it is desirable that the filler in a substantially central part in a plan view of the cage body is stone or a concrete block. Thereby, as the filler, general concrete products, mortar products, stones that can be collected locally, or concrete debris can be used, so that the production cost can be reduced.

[0009] The cage body is made of a polyester monofilament turtle shell net, and it is desirable that a part of the net covering the shrimp cultivation part is cut off to form a notch hole. If a polyester monofilament turtle shell net is used, the durability of the cage body can be enhanced, and the expansion of the notch hole can be prevented. If a notch hole is formed, the entry and exit of large shrimps into the cage body can be promoted.

[0010] Inside or outside the cage body, a panel material for shrimp cultivation is provided, and a plurality of holes are formed in the panel material facing outward, and it is desirable that the holes are formed such that the bottom surface is substantially flat and the height decreases toward the back. Thereby, the holes have a shape suitable for each stage of the growth of shrimps. In addition, the landing of juvenile shrimps in the floating stage can be promoted.

[0011] When a panel material for cultivating shrimps is provided, a concave portion with a substantially flat bottom may be provided on the front side of the hole so as to connect the openings of the plurality of holes arranged in parallel in the width direction. This makes it easier for shrimps to move back and forth through the plurality of holes.

[0012] Also, it is desirable that the shape of the hole in front view is a substantially right triangle, and the hypotenuse is the top of the hole. This makes it easier for the water flow to reach the back of the hole, improving the environment inside the hole.

[0013] Also, the panel material may be made of concrete or mortar and may be carbonated. This suppresses the elution of cement components from the panel material into the water, preventing water quality changes around the artificial reef.

[0014] The panel material is, for example, housed inside the cage body so that the opening of the hole faces outward. This allows shrimps to enter and exit the holes of the panel material through the meshes of the cage body.

[0015] The panel material is fixed to the outside of the cage body, and when lifted, it is desirable that the lower end of the panel protrudes below the lower end of the cage body. This can enhance the stability when the cage body is installed on the seabed.

[0016] The cage body may be housed inside the frame body. This increases the weight of the artificial reef for cultivating shrimps, preventing the artificial reef for cultivating shrimps from moving or toppling due to waves and water currents during rough weather.

Advantages of the Invention

[0017] According to the present invention, it is possible to provide an artificial reef for cultivating shrimps in which a space having a horizontal floor suitable for the habitation of shrimps at each stage from larvae to adults is formed.

Brief Description of the Drawings

[0018]

Figure 1

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Mode for Carrying Out the Invention

[0019] [First Embodiment] Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a plan view of the shrimp-growing fishing reef 1 according to the first embodiment of the present invention, and Fig. 2 is a view showing a vertical cross-section of the shrimp-growing fishing reef 1. Fig. 2(a) is a cross-sectional view taken along line A1-A1 in Fig. 1, and Fig. 2(b) is a cross-sectional view taken along line A2-A2 in Fig. 1. Further, Fig. 3(a) is an enlarged view of the turtle net 8 forming the cage body 2.

[0020] As shown in Figures 1 and 2, the shrimp cultivation reef 1 comprises a cage body 2, a filling material 5, a mat 7, etc. The shrimp cultivation reef 1 is installed on a ground 6 on the bottom of the water. The cage body 2 comprises a substantially rectangular bottom surface and four side surfaces, and the top surface is open. The filling material 5 is filled into the cage body 2. The mat 7 is laid between the ground 6 on the bottom of the water and the bottom surface of the cage body 2.

[0021] The shrimp cultivation reef 1 is provided with a shrimp cultivation section 3 exposed on, for example, four side surfaces of a cage body 2. The shrimp cultivation section 3 is formed by stacking approximately plate-shaped fillers 5a inside the cage body 2 with gaps 31 in the vertical direction. For example, the multiple fillers 5a are arranged in a staggered manner in the vertical direction. The fillers 5a are, for example, stone materials such as Ryukyu limestone. It is desirable that the length of one side of the bottom surface of the cage body 2 is about 1 to 2 m and the height is about 0.5 to 1.0 m. The shrimp cultivation section 3 is formed, for example, in a range from the side surface of the cage body 2 to 40 to 60 cm inward. The bottom of the gaps 31 of the shrimp cultivation section 3 is an approximately flat surface suitable for shrimp habitation because the fillers 5a are approximately plate-shaped.

[0022] In the shrimp cultivation reef 1, the general section 4 filled with block-shaped filler material 5b is formed in the approximate center of the cage body 2 in a plan view. The filler material 5b is natural stone, concrete rubble (concrete chunks) generated when concrete is crushed, etc. The filler material 5b can be anything that is easily procured locally, and the filling work is easy. Therefore, by providing the general section 4, the production costs and production time of the shrimp cultivation reef 1 can be reduced.

[0023] As described above, since the shrimp-growing part 3 is formed by laminating substantially plate-shaped filling materials 5a with gaps deliberately left, in the shrimp-growing artificial reef 1, the porosity of the shrimp-growing part 3 is larger than that of the general part 4. By reducing the porosity of the general part 4 located approximately at the center in plan view in this way, the momentum of the water flow passing through the cage body 2 is weakened, so it is possible to prevent small-sized organisms living in the gap 31 from flowing out of the cage body 2. Also, by weakening the water flow passing through the shrimp-growing artificial reef 1, it is possible to prevent the laminated filling materials 5a from floating up, collapsing, or being washed away. For this reason, damage to the cage body 2 can be suppressed.

[0024] In the shrimp-growing artificial reef 1, the top end of the cage body 2 is open, and the filling materials 5a and 5b are exposed. By exposing the filling materials 5a and 5b near the top end of the cage body 2 as the attachment surface and transplantation surface for algae and corals, it is possible to grow algae and the like for forming an ecosystem cycle. In particular, when the shrimp-growing artificial reef 1 is used in a coral reef area, by using Ryukyu limestone as the filling material 5a, natural settlement of corals and the like can be promoted.

[0025] The cage body 2 is formed using the tortoise-shell net 8 shown in Fig. 3(a). To enhance the durability of the cage body 2, it is desirable that the tortoise-shell net 8 be made of polyester monofilament. As shown in Fig. 3(a), the tortoise-shell net 8 is formed by arranging wire rods 20 in parallel at a predetermined interval on the same plane and twisting adjacent wire rods 20 multiple times at a predetermined pitch to weave them into a tortoise-shell shape. Note that, as shown in Fig. 3(b), a part of the tortoise-shell net 8 may be cut away to form a notch hole 21. The notch hole 21 is sized such that large-sized shrimps that cannot pass through the mesh of the tortoise-shell net 8 can enter and exit the cage body 2. For example, it is sized so that shrimps of the genus Penaeus can pass through. Since the tortoise-shell net 8 does not tear and spread even if a part of the wire rod 20 is cut, the notch hole 21 is maintained at an appropriate size.

[0026] To fabricate the shrimp breeding fishing reef 1, first, assemble the cage body 2 with the turtle shell net 8 and install a partition (not shown) at the boundary between the shrimp breeding section 3 and the general section 4. After forming the shrimp breeding section 3 by stacking the filling material 5a and filling the general section 4 with the filling material 5b, remove the partition. The shrimp breeding fishing reef 1 is lifted by a suspension ring or the like (not shown) provided at the upper end of the cage body 2 and installed on the mat 7 laid on the seabed ground 6. The mat 7 is made of non-woven fabric or the like and protects the bottom surface of the cage body 2 and the surface of the ground 6. Also, the holes in the mat 7 serve as habitats for organisms such as mussels that are food for shrimp. Note that the mat 7 may be arranged inside the cage body 2.

[0027] Thus, in the shrimp breeding fishing reef 1 of the first embodiment, the substantially plate-shaped filling material 5a is stacked with gaps 31 in the vertical direction, thereby forming gaps 31 of various sizes having a horizontal floor. Therefore, a shrimp breeding section 3 having a space suitable for the habitation of shrimp at each stage from larvae to adults can be obtained.

[0028] In the shrimp breeding fishing reef 1, since stones or concrete debris that can be collected locally can be used as the filling material 5b, the manufacturing cost can be reduced. Also, by manufacturing the cage body 2 with a turtle shell net 8 made of polyester monofilament to form the notch holes 21, the durability of the cage body 2 can be enhanced, and at the same time, the expansion of the notch holes 21 can be prevented. If the notch holes 21 are formed, the entry and exit of large shrimp into the cage body 2 can be promoted.

[0029] In the first embodiment, the shrimp breeding section 3 is provided so as to be exposed on the four side surfaces of the cage body 2. However, the shrimp breeding section 3 may be provided at least in part at a site where it is exposed on the side surface of the cage body 2. For example, there may be a case where the shrimp breeding section 3 is provided so as to be exposed on 1 to 3 side surfaces, and the general section 4 filled with the filling material 5b is exposed on the remaining side surfaces.

[0030] In the first embodiment, slate-shaped filler 5a is made of stacked Ryukyu limestone stones. However, the filler 5a may be made of stones other than Ryukyu limestone. Further, the filler 5a may be a plate-shaped material made of concrete or mortar. If concrete products or mortar products are used as the filler 5a, the production cost and production time of the shrimp-growing artificial reef 1 can be reduced.

[0031] FIG. 4 is a diagram showing an example using another filler 5a. In the example shown in FIG. 4(a), a plate-shaped material made of concrete or mortar is used as the substantially plate-shaped filler 5a. Further, in the example shown in FIG. 4(b), a plate-shaped material made of concrete or mortar and a substantially plate-shaped stone are used in combination as the substantially plate-shaped filler 5a. Also in the example shown in FIG. 4, by using plate-shaped materials made of concrete or mortar having different sizes or changing the intervals between the fillers 5a, gaps 31 of various sizes having a horizontal floor can be formed.

[0032] Hereinafter, another example of the present invention will be described as the second to fourth embodiments. The second to fourth embodiments will be described with respect to the differences from the first embodiment, and the description of the same configurations will be omitted by attaching the same reference numerals in the drawings and the like. Further, the configurations described in the first to fourth embodiments can be combined as necessary.

[0033] [Second Embodiment] FIG. 5 is a diagram showing a horizontal cross-section of the shrimp-growing artificial reef 1a according to the second embodiment of the present invention. FIG. 6 is a diagram showing a vertical cross-section of the shrimp-growing artificial reef 1a, where FIG. 6(a) is a cross-sectional view taken along line B1-B1 of FIG. 5, and FIG. 6(b) is a cross-sectional view taken along line B2-B2 of FIG. 5. FIG. 7(a) is a diagram showing an overview of the shrimp-growing panel material 9.

[0034] The shrimp-growing artificial reef 1a of the second embodiment is mainly different from the shrimp-growing artificial reef 1 of the first embodiment in that a shrimp-growing panel material 9 is provided inside the cage body 2.

[0035] As shown in FIGS. 5 and 6, the shrimp-growing fishing reef 1a is provided with a shrimp-growing part 3 so as to be exposed on the four side surfaces of the cage body 2. For example, a shrimp-growing panel material 9 is arranged between a part of the side surfaces of two opposing cage bodies 2 among the four side surfaces and the filling material 5a. The shrimp-growing panel material 9 is a panel material made of concrete or mortar, and it is desirable that carbonation treatment be performed. The shrimp-growing panel material 9 may be colored in a dark natural reef color that suppresses light reflection so as to have a brightness preferred by shrimp. The surface of the shrimp-growing panel material 9 may be finished with a rough surface using coral sand or coral sand so that shrimp can move easily.

[0036] As shown in FIG. 7(a), a plurality of holes 11 are formed on one side surface of the shrimp-growing panel material 9, and a recess 10 with a substantially flat bottom 12 is provided so as to connect the openings 13 of the plurality of holes 11 arranged in parallel in the width direction (the left-right direction in FIG. 7(a)). That is, the recess 10 is continuously formed in the width direction of the shrimp-growing panel material 9, and the plurality of holes 11 are arranged at a predetermined interval. In addition, the plurality of holes 11 provided side by side in the width direction and the recess 10 connecting them are formed in a plurality of stages at a predetermined interval in the vertical direction. The shrimp-growing panel material 9 is arranged so that the opening 13 of the hole 11 faces the outside (the recess 10) of the shrimp-growing fishing reef 1a, and the recess 10 serves as a passage for shrimp to come and go through the plurality of holes 11. The height and width of the shrimp-growing panel material 9 are determined so as not to exceed the height and width of the side surface of the cage body 2. The thickness of the shrimp-growing panel material 9 is about 20 to 30 cm, and the depth and height of the recess 10 are 2 to 4 cm.

[0037] FIG. 7(b) is a diagram showing the shape of the hole 11. As shown in FIG. 7(b), the hole 11 has a substantially right-angled triangle shape in a front view, and the hypotenuse becomes the top portion 14 of the hole 11. Inside the hole 11, the bottom surface 15 is substantially flat, and as going from the opening 13 to the back, the height decreases and the width narrows. That is, the size (height and width) of the hole 11 becomes smaller as going deeper, and the hole 11 forms a closed space without penetrating to the back side. The hole 11, for example, has a height 18 of the opening 13 of 2 to 3 cm and a width 16a of 10 to 15 cm, and a height of the innermost portion 19 of approximately 0 cm and a width 16b of 5 to 10 cm. The depth 17 of the hole 11 is 15 to 20 cm, and is set to a value less than the thickness of the shrimp-growing panel material 9. Since the inner space of the hole 11 becomes narrower as going from the opening 13 to the back, the water flow reaches the back of the hole 11, so that the water circulates easily and does not settle. The shrimps inhabiting the hole 11 can move from the innermost portion 19 to the opening 13 side as they grow.

[0038] In the shrimp-growing fishing reef 1a of the second embodiment, the same effects as those of the shrimp-growing fishing reef 1 of the first embodiment can be obtained. Further, in the shrimp-growing fishing reef 1a, by arranging the shrimp-growing panel material 9 inside the cage body 2, holes 11 suitable for the inhabitation of shrimps at each stage from larvae to adults and recesses 10 serving as passages for the shrimps to move back and forth between the holes 11 can be provided. Furthermore, by making the bottom surface 15 of the hole 11 substantially flat and the height of the hole 11 decrease as going deeper, the hole 11 has a shape suitable for each stage of the growth of shrimps, and the settlement of juvenile shrimps in the floating stage can be promoted. If the shrimp-growing panel material 9 is subjected to carbonation treatment, the cement component does not elute into the water, and the water quality change around the shrimp-growing fishing reef 1a can be prevented.

[0039] In the second embodiment, the shrimp-growing panel material 9 is arranged between a part of two opposing side surfaces of the four side surfaces of the cage body 2 and the filling material 5a, but the arrangement and the number of the shrimp-growing panel materials 9 are not limited to this. At least one sheet of the shrimp-growing panel material 9 may be arranged inside the cage body 2. Further, when the filling material 5b is exposed on the side surface of the cage body 2, the shrimp-growing panel material 9 may be arranged between a part of the side surface of the cage body 2 and the filling material 5b.

[0040] [Third Embodiment] FIG. 8 is a plan view of the shrimp breeding fishing reef 1b according to the third embodiment of the present invention. FIG. 9 is a view showing a vertical cross section of the shrimp breeding fishing reef 1b.

[0041] The shrimp breeding fishing reef 1b of the third embodiment is mainly different from the shrimp breeding fishing reef 1a of the second embodiment in that a shrimp breeding panel material 9 is provided outside the cage body 2.

[0042] As shown in FIGS. 8 and 9, in the shrimp breeding fishing reef 1b, the shrimp breeding panel material 9 is fixed to the outer sides of the four side surfaces of the cage body 2. The shrimp breeding panel material 9 is arranged such that the opening of the hole 11 faces outward of the shrimp breeding fishing reef 1b. As shown in FIG. 9, when the shrimp breeding fishing reef 1b is lifted using a suspension ring 24 or the like, the lower end 22 of the shrimp breeding panel material 9 protrudes below the lower end 23 of the cage body 2.

[0043] Also in the shrimp breeding fishing reef 1b of the third embodiment, the same effects as those of the shrimp breeding fishing reef 1a of the second embodiment can be obtained. In addition, when the cage body 2 is installed on the ground, it may be slightly deflected, for example, the side surface may be deformed so as to bulge outward. Therefore, the shrimp breeding panel material 9 may be installed inclined due to the deflection. On the other hand, in the shrimp breeding fishing reef 1b, since the lower end 22 of the shrimp breeding panel material 9 protrudes below the lower end 23 of the cage body 2 when lifted, the shrimp breeding panel material 9 can be installed on the ground first to support the shrimp breeding fishing reef 1b. Therefore, the shrimp breeding panel material 9 can be made to stand more reliably. In addition, when submerged in water, the lower ends 22 of the four shrimp breeding panel materials 9 will contact the bottom ground or mat, and it can be installed in a stable state.

[0044] [Fourth Embodiment] FIG. 10 is a view showing the shrimp breeding fishing reef 1c according to the fourth embodiment of the present invention. The shrimp breeding fishing reef 1c of the fourth embodiment is mainly different from the shrimp breeding fishing reef 1 of the first embodiment in that the cage body 2 is housed in the frame body 25.

[0045] As shown in Fig. 10(a), the frame body 25 is a frame in a substantially rectangular parallelepiped shape. The frame body 25 is made of, for example, concrete, steel, wood, etc., and a suspension ring 24 is provided on the upper surface. As shown in Fig. 10(b), for the shrimp-growing artificial reef 1c, the entire cage body 2 filled with the filler 5 is housed inside the frame body 25.

[0046] Also in the shrimp-growing artificial reef 1c of the fourth embodiment, the same effects as those of the shrimp-growing artificial reef 1 of the first embodiment can be obtained. Further, when the weight of the cage body 2 filled with the filler 5 is not large, there is a risk that the cage body 2 installed on the seabed ground 6 may move or topple due to water flow and waves during stormy weather. In contrast, for the shrimp-growing artificial reef 1c, since the cage body 2 is housed in the frame body 25, it can resist water flow and waves with sufficient weight when installed on the ground 6. Therefore, movement and toppling can be prevented during stormy weather.

[0047] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope of the technical idea disclosed in the present application, and it is naturally understood that those also belong to the technical scope of the present invention.

[0048] For example, when the filler 5a is a plate-shaped material made of concrete or mortar, or when the filler 5b is concrete gravel, carbonation treatment may be performed in the same manner as the shrimp-growing panel material 9.

Explanation of Reference Numerals

[0049] 1, 1a, 1b, 1c………Shrimp-growing artificial reef 2………Cage body 3………Shrimp-growing part 4………General part 5, 5a, 5b………Filler 6………Ground 7………Mat 8………Honeycomb wire 9………Shrimp-growing panel material 10………Concave part 11………Hole 12………Bottom 13………Opening 14………Top part 15………Bottom surface 16a, 16b………Width 17………Depth 18………Height 19………Rermost part 20………Wire 21………Notch hole 22, 23………Lower end 24………Hanging ring 25………Frame body 31………Gap

Claims

1. A cultivation fishing reef for shrimps filled with a filler in a cage body, wherein at least a part of the part exposed on the side surface of the cage body is provided with a shrimp cultivation part in which substantially plate-shaped fillers are laminated with gaps in the vertical direction, the porosity of the shrimp cultivation part is larger than the porosity in the substantially central part of the cage body in a plan view, and the cultivation fishing reef for shrimps is characterized by this.

2. The substantially plate-shaped filler is made of concrete, mortar, or stone, and the filler in the substantially central part of the cage body in a plan view is stone or a concrete block. The cultivation fishing reef for shrimps according to claim 1 is characterized by this.

3. The cage body is made of a polyester monofilament turtle shell net, and a part of the net covering the shrimp cultivation part is cut off to form a notch hole. The cultivation fishing reef for shrimps according to claim 1 is characterized by this.

4. Inside or outside the cage body, a panel material for shrimp cultivation is provided, a plurality of holes are formed in the panel material facing outward, the holes are formed such that the bottom surface is substantially flat and the height decreases as it goes deeper. The cultivation fishing reef for shrimps according to claim 1 is characterized by this.

5. On the front side of the holes, a recess with a substantially flat bottom is provided so as to connect the openings of the plurality of holes arranged in parallel in the width direction. The cultivation fishing reef for shrimps according to claim 4 is characterized by this.

6. The shape of the holes in a front view is substantially a right triangle, and the hypotenuse is the top part of the holes. The cultivation fishing reef for shrimps according to claim 4 is characterized by this.

7. The panel material is made of concrete or mortar and is carbonated. The cultivation fishing reef for shrimps according to claim 4 is characterized by this.

8. The panel material is housed inside the cage body so that the openings of the holes face outward. The cultivation fishing reef for shrimps according to claim 4 is characterized by this.

9. The panel material is fixed to the outside of the cage body, and when lifted, the lower end of the panel protrudes below the lower end of the cage body. The cultivation fishing reef for shrimps according to claim 4 is characterized by this.

10. The cage body is housed inside a frame body. The cultivation fishing reef for shrimps according to claim 1 is characterized by this.

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