Unit for spiny lobster proliferation bank and spiny lobster proliferation bank

Abstract

To provide a spiny lobster proliferation bank that can provide habitats for all of a puerulus, a young lobster, and a lobster (adult) and can be stably installed in the sea.SOLUTION: A unit for a spiny lobster proliferation bank includes a plurality of stages of steel plates 10, 11, ... that is vertically spaced and a plurality of spaces 51, 52, 53 between the upper and lower steel plates 10, 11, the spaces being formed by arranging a plurality of wall materials 3 and oblique wall materials 3N between the upper and lower steel plates 10, 11, the spaces 51, 52, 53 having sizes differing at an upper stage and a lower stage. The oblique wall materials 3N make the spaces 51, 52, 53 become narrower as they go toward the back, which prevents natural enemies from coming from the back and makes spaces comfortable for lobsters. The spaces 51, 52, 53 are configured using the steel plates and steel materials, which as compared with the case of being made from concrete, provides higher relative density and strength enabling obtainment of a unit capable of enduring even a severe condition of a shallow installation location, where spiny lobsters can grow by moving the spaces 51, 52, 53 having the different sizes depending on their body lengths.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a unit for an Isae shrimp breeding reef and an Isae shrimp breeding reef.

Background Art

[0002] Conventionally, in relation to this type of breeding reef, an Isae shrimp breeding reef in which a plurality of concrete blocks are vertically and multi-stagedly assembled and fixed with gaps of suitable dimensions for the Isae shrimp growing on the concrete reef base to hide (for example, Patent Document 1), a fish reef block made of concrete and having a rectangular parallelepiped body portion, with each side surface of the body portion being horizontal, maintaining a certain height, and having closed shelf chambers that become narrower toward the inside and are recessed in parallel up and down (for example, Patent Document 2), or a concrete main body portion having at least one side wall with a plurality of recesses of different sizes (diameter and depth) for post larvae and juvenile shrimp to change their habitats according to their growth, which extends in an overhanging shape upward, and is placed on a base portion having a surface wider than the bottom surface of the main body portion, an Isae shrimp breeding reef (for example, Patent Document 3), etc.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] As in the above Patent Documents 1 to 3, most of the conventional Isae shrimp breeding reefs are made of concrete structures, and iron is only used for suppression or support, etc., and has not been used as a functional member.

[0005] After the larva of the kuruma prawn, Philosoma, floats and then repeatedly molts, it becomes a puerulus and settles on the shore. Subsequently, it becomes a juvenile prawn and grows into a kuruma prawn. This is because the space that becomes its habitat changes depending on the size of each individual after it becomes a puerulus and settles. For this reason, in the case of a concrete structure, it has been said that by making holes (the shelf chamber in Patent Document 2, the recess in Patent Document 3) or stacking concrete slabs (the blocks in Patent Document 1), it is possible to create a space and a growth environment from larvae to kuruma prawns.

[0006] However, in order to give strength to the concrete slab, a certain thickness is required. Therefore, in order to create spaces of various heights for each individual, many concrete blocks or concrete slabs must be stacked. In the sea, the resistance increases in proportion to the projected area due to the influence of waves and currents, and it is necessary to attach a weight or reduce the number of concrete blocks or concrete slabs to be stacked to reduce the resistance surface in order to stabilize the structure. And when reducing the number of concrete blocks or concrete slabs to be stacked, there is a problem that spaces of various heights cannot be created and all individuals cannot be satisfied.

[0007] Also, in the breeding reef of Patent Document 3, a plurality of recesses (holes) of appropriate sizes according to the growth stage are provided on the wall surface of the concrete main body as hiding places. However, since it is made of concrete, there is a limit to the density of the holes to be formed, and it is difficult to increase the opening ratio, which is the opening area of the holes with respect to the area of the wall surface. It was necessary to increase the size of the main body to ensure the opening area and number of the holes.

[0008] Furthermore, in the breeding reef of Patent Document 3, holes of different sizes are provided side by side on the wall surface of the main body. Since the grown kuruma prawns prey on those on the seabed, even if they try to move to the lower holes close to the seabed, the number of holes of a size corresponding to their body length is limited, and they have to return to the large upper holes that are empty. In some cases, there is also a risk of moving to another place from the breeding reef.

[0009] The present invention solves the above problems, and aims to provide a unit for a Japanese common prawn breeding reef and a Japanese common prawn breeding reef that can provide all habitats from larvae to juvenile prawns and adult Japanese common prawns, and can be stably installed in the sea.

Means for Solving the Problems

[0010] The invention according to claim 1 of the present invention is characterized in that steel plates are provided in multiple stages at intervals in the vertical direction, a plurality of steel materials are arranged between the upper and lower steel plates to form a plurality of spaces between the upper and lower steel plates, and the spaces have different sizes.

[0011] The invention according to claim 2 of the present invention is characterized in that a plurality of wall materials made of steel materials in the front-rear direction are arranged at intervals in the left-right direction between the upper and lower steel plates, and a plurality of spaces are formed between the upper and lower steel plates by these wall materials, and the height of the space in the lower stage is higher than the height of the space in the upper stage.

[0012] Further, the invention according to claim 3 of the present invention is characterized in that the space shrinks from one side in the front-rear direction to the other side.

[0013] Further, the invention according to claim 4 of the present invention is characterized in that a functional material for larval settlement is provided on the upper surface of the steel plate above the uppermost stage.

[0014] Further, the invention according to claim 5 of the present invention is characterized in that a plurality of the units for a Japanese common prawn breeding reef according to claim 1 or 2 are arranged on a base plate made of a steel plate.

Effects of the Invention

[0015] According to the configuration of claim 1 of the present invention, by constructing a space with steel plates and steel materials, a unit with a larger specific gravity and strength than that made of concrete can be obtained, and it can withstand severe sea area conditions in shallow installation locations. In the unit, Japanese common prawns can move to spaces of different sizes according to their body lengths and grow.

[0016] Moreover, according to the configuration described in claim 2, as it grows, it moves to a wide space corresponding to its body length and grows until it becomes an adult shrimp.

[0017] Also, according to the configuration described in claim 3, octopuses, which are natural enemies, cannot enter spaces with a narrow depth and can grow in a state protected from natural enemies.

[0018] In addition, according to the configuration described in claim 4, since the space is constituted by steel plates and steel materials, by providing a functional material for the settlement of Puerulus on the upper surface, it becomes easier for the eggs of Isopoda shrimp and Puerulus that have floated in with Philosoma to settle on the upper surface.

[0019] Furthermore, according to the description in claim 5, by combining a plurality of units, it is possible to easily manufacture an Isopoda shrimp breeding reef of a required size.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Best Mode for Carrying Out the Invention

[0021] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the embodiments described below do not limit the content of the present invention described in the claims. Also, not all of the configurations described below are essential requirements of the present invention.

Examples

[0022] Hereinafter, Example 1 of the present invention will be described with reference to FIGS. 1 to 6. The unit 2 for an isopod growth reef, which is composed of one or more isopod growth reefs 1, is mainly composed of a steel material. Examples of the steel material include steel plates, flat steels, angle steels, angle steel pipes, round steels, round steel pipes, channel steels, and groove steels, and it is assembled by welding or the like.

[0023] In this example, the unit 2 is provided in multiple stages by arranging a plurality of steel plates 10, 11, 12, 13, 14, 15 having a square planar shape and the same size at vertical height intervals from the bottom. The steel plates 10, 11, 12, 13, 14, 15 are parallel to each other and arranged horizontally. Note that the lowermost steel plate 10 is the base plate of the unit 2.

[0024] A space is provided between the lowermost steel plate 10, which is the bottom plate of the unit 2 and the lower surface of the first stage 21, and the steel plate 12, which is the upper surface of the first stage 21. Also, spaces are provided between the steel plates 11, 12, 13, which are the lower surfaces of the second, third, and fourth stages, and the steel plates 12, 13, 14, which are the upper surfaces of the second, third, and fourth stages 22, 23, 24. Further, a space is provided between the steel plate 14, which is the lower surface of the fifth stage 25, and the uppermost steel plate 15, which is the top plate of the unit 2 and the upper surface of the fifth stage 25. Note that the vertical dimension of the space corresponds to the height interval.

[0025] The lowermost steel plate 10 that is grounded to the seabed or the like uses a thicker one compared to the other steel plates 11, 12, 13, 14, 15. Since the installation location of the unit 2 is not necessarily sandy, in order to ensure strength so that it will not be damaged even if installed in a rocky reef area or the like, a thicker one is used compared to the others. Also, the steel plate 10 also acts as a weight, and the unit 2 can be stably installed.

[0026] Also, although the other steel plates 11, 12, 13, 14, 15 use the same thickness, they may have different thicknesses. Note that steel plates 10, 11, 12, 13, 14, 15 with a side length of 1200 mm or less and 500 mm or more are used.

[0027] The reason for setting the length of the steel plate 10 to 1200 mm or less in this way is to make the space of the first stage 21 a space with dimensions suitable for a single Japanese spiny lobster and to avoid unnecessary enlargement. Also, the reason for setting it to 500 mm or more is to make it a space 21A suitable for a large Japanese spiny lobster exceeding 300 mm.

[0028] As shown in FIG. 3, the first stage 21 of the unit 2 has three spaces 21A each of which is divided into three in the left - right width direction by the front - rear wall members 3 in the front - rear direction which is one of the front - rear direction and the left - right direction. The wall members 3, 3 are parallel to each other and arranged in the vertical direction. The steel materials used as the wall members 3 are composed of flat steel, angle steel, channel steel, etc. The wall members 3, 3 arranged at the edges 10S, 10S of the left - right ends and the wall members 3, 3 at two central positions are arranged in parallel at equal intervals in the left - right direction. And in this example, the length of the wall members 3, 3 is equal to the length of the steel plate 10 in the front - rear direction, and both end edges 3T, 3T in the length direction of the wall member 3 are located at the edges 10Z, 10Z of the front - rear ends of the steel plate 10. Note that the front - rear direction is one side direction, and the left - right direction intersecting the front - rear direction is the other side direction.

[0029] Similarly, the wall members 3, 3 are arranged at the left - right edges 11S, 12S, 13S, 14S, 15S of the steel plates 11, 12, 13, 14, 15, and both end edges 3T, 3T in the length direction of the wall member 3 are located at the edges 10Z, 10Z, 11Z, 11Z, 12Z, 12Z, 13Z, 13Z, 14Z, 14Z, 15Z, 15Z (FIGS. 4 and 5) of the front - rear ends of the steel plates 10, 11, 12, 13, 14, 15.

[0030] Also, a water passage 4 is vertically provided at the center in the length direction of the wall member 3. This water passage 4 is equal in height to the wall member 3, and the dimension in the length direction of the wall member is about 30 - 50 mm. In this example, as shown in FIG. 2 etc., the wall member 3 is divided at the center in the length direction, and the water passage 4 is formed by setting the interval between the divided edges 3F, 3F to about 30 - 50 mm.

[0031] Also, in this example, the space 21A has the same vertical dimension and the same left - right dimension over the entire length in the length direction, the longitudinal cross - sectional shape in the width direction is the same, and both ends in the length direction are entirely open by the openings 31, 31. Therefore, it is easy for the Japanese spiny lobster to enter and exit. Also, since both ends are opened by the openings 31, 31 and the water passage 4 is provided at the center of the wall member 3, the resistance due to the ocean current can be reduced and the retention of seawater in the space 21A can be prevented. Note that the spaces in other stages are the same.

[0032] As will be described later, since the space 21A of the first stage 21 houses one (one individual) live spiny lobster, the longitudinal length of the space 21A is set to a length suitable for the growth of one spiny lobster, and one is housed in the space 21A. Therefore, the front-to-back width and left-to-right width of the steel plates 10, 11, 12, 13, 14, and 15 are set to 1000 mm or less. Note that the left-to-right length of the steel plates 10, 11, 12, 13, 14, and 15 is not limited to 1000 mm and may exceed 1000 mm. In this case, the number of spaces 21A can be increased.

[0033] As shown in FIG. 4, the second stage 22 of the unit 2 has four spaces 22A divided by the wall material 3, which is more than the first stage 21. The steel material used as the wall material 3 is the same as that of the first stage 21 except for the different dimensions. Also, a partition 5 is provided at the center in the length direction of the space 22A. In this example, the space 21A is divided into two by the partition 5 to form divided spaces 22B and 22B. The steel material used for the partition 5 is flat steel, angle steel, channel steel, etc. The partition 5 is formed long in the left-right direction intersecting the wall material 3, and gaps 6 and 6 are provided between both ends of the partition 5 and the inner surfaces of the wall materials 3 and 3 on both sides sandwiching the partition 5. The flow of seawater is allowed through these gaps 6. Also, the water inlet 4 is provided at the center in the length direction of the wall material 3. Note that in this example, the water inlet 4 and the gap 6 are provided in the wall material 3 of all stages.

[0034] As shown in FIG. 5, the fifth stage 25, which is the uppermost stage of the unit 2, has ten spaces 25A divided by the wall material 3, which is more than the other lower stages. Steel materials such as angle steel and round steel are used as the wall material 3. Also, a partition 5 is provided at the center in the length direction of the space 25A. In this example, the space 25A is divided into two to form divided spaces 25B and 25B. The steel material used for the partition 5 is angle steel, round steel, etc. Angle steel and round steel are arranged in the vertical direction, and the gap 6 is provided between both left and right ends of this partition 5 and the inner surfaces of the wall materials 3 and 3 on both sides sandwiching the partition 5. The flow of seawater is allowed through this gap 6.

[0035] The third and fourth stages 23 and 24 of unit 2 have five and six spaces 23A and 24A respectively that are divided by the wall material 3. Also, in the central part of the length direction of the spaces 23A and 24A, partitions 5 that are long in the left - right direction are provided. In this example, the spaces 23A and 24A are divided into two parts each, forming divided spaces 23B, 23B, 24B, and 24B. Also, a water inlet 4 and a gap 6 are provided.

[0036] And openings 31, 31 are provided in the front and rear of the spaces 21A, 22A, 23A, 24A, and 25A respectively. In this example, for each stage, the front and rear openings 31, 31 have the same shape, and the width W and height H of the opening 31 are larger in the lower stage than in the upper stage. Note that the opening area (width W × height H) of the opening may be formed such that it is larger in the lower stage than in the upper stage. Also, the volume of the spaces 21A, 22B, 23B, 24B, and 25B of each stage is larger in the lower stage than in the upper stage.

[0037] Also, except for the fifth stage 25, the steel materials used for the partition 5 are flat steel, angle steel, channel steel, etc. The partition 5 is formed long in the left - right direction intersecting the wall material 3, and gaps 6, 6 are provided between both ends of the partition 5 and the inner surfaces of the wall materials 3, 3 on both sides sandwiching the partition 5. This gap 6 allows the flow of seawater. Also, the water inlet 4 is provided at the central part of the length direction of the wall material 3. Note that the steel material of the partition 5 in the fifth stage 25 may also be flat steel, angle steel, channel steel, etc.

[0038] Unit 2 is manufactured by stacking several steel plates 10, 11, 12, 13, 14, 15 and arranging angle steel, round steel, equal - side angle steel, channel steel, flat steel, etc. between them. Since it is easy to manufacture and can create spaces with various widths, heights, and depths, it is possible to provide the steel - made isopod breeding reef 1 equipped with all habitats from larvae, juvenile shrimps to adult isopods and its unit 2. Also, in the construction of the fishing ground of the steel - made isopod breeding reef 1, it is possible to easily construct the breeding reef 1 of the required size.

[0039] Also, regarding the unit 2 for the steel-made Japanese lobster breeding reef, by increasing the number of stages of the unit 2 or connecting the units 2 together, it is possible to easily create the breeding reef 1 of the required size. And by being composed of steel materials, compared with the Japanese lobster breeding reefs made of other materials, it has a higher specific gravity and strength, so it can withstand severe sea area conditions in shallow installation locations, and can enhance the structural resistance and stability against overturning of the breeding reef 1.

[0040] The Japanese lobster breeding reef 1 and the unit 2 for the breeding reef in this embodiment are composed of steel. However, in order to facilitate the settlement when the eggs or phyllosoma of the Japanese lobster float and become puerulus and settle, a functional material 7 for puerulus settlement is attached.

[0041] The functional material 7 is provided on the upper side of the unit 2. In this example, it is attached to the entire surface or partially on the upper surface of the steel plate 15 above the fifth stage 25 at the top (Fig. 6). Examples of the functional material 7 include slate, synthetic resin plates, synthetic cloth, etc. Those that are more likely to catch puerulus compared to steel materials are preferred.

[0042] The slate used as the functional material 7 is obtained by processing viscous slate into thin plate shapes, and those having fine irregularities on the surface are used. Also, as the synthetic resin plate used as the functional material 7, those with a lattice shape or openings can be used. And as an example, if the functional material 7 is slate, puerulus settles on the fine irregularities on the surface (upper surface), and this puerulus moves to the divided spaces 25B, 25B of the fifth stage below, and as it grows, it moves to the space of the lower stage with a larger space. This is because there is a space of a size preferred according to the body length. When it grows larger, it moves to the lower wider space, and when it is small, it preys on things away from the seabed like plankton, and when it grows larger, it moves downward in order to prey on things on the seabed at the lower stage.

[0043] The sizes of the spaces 21A, 22B, 23B, 24B, and 25B vary depending on each body length. Since the body length of the Puerulus is about 20 mm, the height (height dimension) H of the space 25A in the fifth stage 25 is set to about 15 to 30 (15 or more and 30 or less) mm. The juvenile shrimp has a body length of 20 mm and gradually grows larger, increasing by about 100 g in one year, and its lifespan is said to be 20 years or more. Therefore, as the body length increases each time, it is preferable to set the height H of the space 24A in the fourth stage 24 to 30 to 50 mm, the height H of the space 23A in the third stage 23 to 50 to 100 mm, the height H of the space 22A in the second stage 22 to 100 mm to 170 mm, and the height H of the space 21A in the first stage 21 to about 170 mm to 250 mm.

[0044] The width W of the spaces 21A to 25A is equal to or greater than the height H and may be twice or more the height H. Preferably, it is about 1 to 1.5 times the height H from the perspective of the space area. That is, if the steel plate 10 has a constant width and, hypothetically, the width W of the space can provide 8 spaces when it is 1 times the height H, then when it is 1.5 times, the number of spaces is reduced to 5, and when it is 2 times, the number of spaces is reduced to 4. Therefore, 1.5 times or less is preferable.

[0045] Next, the unit 2 will be described. When the unit 2 alone constitutes the Japanese prawn breeding reef 1, when the unit 2 is installed on the seabed, the thick steel plate 10 serves as a weight and stability is obtained. Also, even if it is set in a rocky reef area, the strength that is not damaged can be obtained. Moreover, by making all the structural members of the unit 2 out of steel, the specific gravity increases, so the underwater weight becomes heavier, and it can be made into a stable structure against overturning by waves and currents. Note that the structural members are those that form the framework of the unit 2. In this example, they are the wall material 3 and the steel plates 10 to 15, which are the members that make up the space.

[0046] In the unit 2 installed on the seabed, the larvae of the kuruma prawn that have floated as philosoma become the larvae of puerulus and settle down. In particular, the puerulus settles on the functional material 7 provided on the upper surface. Then, the settled puerulus larvae grow in the order of juvenile prawns and adult prawns, move to the large spaces 24A, 23A, 22A, 21A under the growth reef 1 according to their body lengths, gradually grow larger, and grow as adult prawns in the space 21A of the first stage 21. Incidentally, the female holds the eggs of the kuruma prawn with her pleopods and protects them until they hatch. After hatching, they become philosoma and float.

[0047] By changing the conventionally used concrete blocks or concrete slabs to steel materials in this way, the resistance surface of the unit 2 can be significantly reduced. Also, between the steel plates 10, 11, 12, 13, 14 and the steel plates 11, 12, 13, 14, 15, by arranging the angle steel cut into a rod shape, or a combination of round steel, equal - angle steel, channel steel and flat steel as the wall material 3 or partition 5, spaces 21A, 22B, 23B, 24B, 25B of various heights, widths and lengths can be created, making it easy to manufacture the unit 2 having a plurality of spaces. Also, by arranging a plurality of these on a plane, spaces of various widths can be created.

[0048] As a result, it is possible to manufacture a steel - made kuruma prawn growth reef 1 with a structure that allows the larvae of the kuruma prawn that have floated as philosoma to select an appropriate space to become the larvae of puerulus and settle down, and then, at the stage of growing into juvenile prawns and adult kuruma prawns while molting, to select a space according to their body lengths.

[0049] Also, by adjusting the size of the steel plate, as a single unit 2, the number of tiers, the height and size of each space can be adjusted. By changing the space and number of tiers of the unit 2 or combining the same unit 2, the steel-made Japanese spiny lobster breeding reef 1 suitable for the area can be created. Furthermore, regarding the unit 2 for the steel-made Japanese spiny lobster breeding reef, by connecting the units 2 in the left-right direction, the breeding reef 1 of the required size can be easily constructed. Also, if the left-right width of the steel plates 10 - 15 of one unit 2 is doubled, the number of spaces in each tier can be doubled. In this case, the front-back width of the steel plates 10 - 15 remains unchanged.

[0050] Furthermore, by making all components except the functional material 7 from steel, the specific gravity increases, resulting in a heavier underwater weight, and a stable structure against overturning by waves and currents can be obtained. And by constructing the unit 2 from steel, compared to the Japanese spiny lobster breeding reefs made of other materials, the specific gravity is heavier and it is stronger, so the structural resistance of the breeding reef 1 and the stability against overturning that can withstand severe sea area conditions in shallow installation locations can be obtained.

[0051] Also, although the Japanese spiny lobster breeding reef 1 and the unit 2 for the breeding reef in this embodiment are made of steel, when the eggs or phyllosoma of the Japanese spiny lobster float and become puerulus and settle, the functional material 7 (slate, plastic plate, synthetic cloth, etc.) for facilitating settlement can be attached.

[0052] Furthermore, the number of tiers in the unit 2 requires at least 4 tiers. There is also a paper stating that the body length changes in 8 stages due to molting. According to this, the required number of tiers is from 4 to 8, but considering the cost, about 5 tiers in this embodiment are suitable.

[0053] Thus, in this embodiment, corresponding to claim 1, steel plates 10, 11, 12, 13, 14, 15 are provided in multiple stages with an interval therebetween vertically, and a plurality of wall materials 3 made of steel materials are arranged between the upper and lower steel plates 10, 11, 12, 13, 14, 15 to form a plurality of spaces 21A, 22A, 23A, 24A, 25A between the upper and lower steel plates 10, 11, 12, 13, 14, 15. Since there are spaces 21A, 22A, 23A, 24A, 25A with different sizes, by constructing the spaces 21A, 22A, 23A, 24A, 25A with steel plates and steel materials, the unit 2 has a larger specific gravity and higher strength compared to those made of concrete, and thus can withstand severe sea area conditions in a shallow installation location. In the unit 2, the isopods can move to spaces 21A, 22A, 23A, 24A, 25A with different sizes according to their body lengths and grow.

[0054] Also, in this embodiment, corresponding to claim 2, steel plates 10, 11, 12, 13, 14, 15 are provided in multiple stages with an interval therebetween vertically, and the interval at the lower stage is set wider than that at the upper stage. A plurality of wall materials 3 made of steel materials in the front-rear direction are arranged with an interval therebetween in the left-right direction between the upper and lower steel plates 10, 11, 12, 13, 14, 15. Since a plurality of spaces 21A, 22A, 23A, 24A, 25A are arranged side by side between the upper and lower steel plates 10, 11, 12, 13, 14, 15 by these wall materials 3, as they grow, they can move to a wider lower space corresponding to their body lengths and grow until they become parent shrimps.

[0055] Also, in this embodiment, corresponding to claim 4, since a functional material 7 for Puellnus implantation is provided on the upper surface of the uppermost steel plate 15, and the spaces 21A, 22A, 23A, 24A, 25A are formed by the steel plates 10, 11, 12, 13, 14, 15 and steel materials, by providing the functional material 7 for Puellnus bottom landing on the upper surface, the Puellnus floating with the eggs or phyllosoma of the isopods is more likely to land on the upper surface.

[0056] As an effect of the embodiment described below, since the water inlet 4 is provided on the central side in the longitudinal direction of the wall member 3, the water inlet 4 allows the spaces on both sides to communicate with the external sea, and adjacent spaces communicate with each other, ensuring the fluidity of the water inside the unit 2 and forming a space suitable for growth. Further, in the space 21A, the cross-sectional shape in the width direction is the same over the entire length in the longitudinal direction for each step, and both ends in the longitudinal direction are entirely open by the openings 31, making it easy for the Japanese spiny lobster to enter and exit.

[0057] Also, a partition 5 is provided at the center in the longitudinal direction of the space 22A. In this example, the partition 5 divides the space 21A into two to form divided spaces 22B and 22B, and the length of the divided space 22B communicating with the openings located at both ends in the longitudinal direction can be set to a length suitable for growth.

[0058] Furthermore, gaps 6 and 6 are provided between both ends of the partition 5 and the inner surfaces of the wall members 3 and 3 on both sides sandwiching the partition 5. These gaps 6 allow the flow of seawater, preventing the retention of seawater inside the unit 2. Also, since the seawater flowing in from one end in the longitudinal direction of the space 22A flows out to the outside from the other end in the longitudinal direction of the space 22A, it becomes difficult to be affected by the flow of seawater.

[0059] In addition, the ratio of the total area of the openings of the spaces 21A, 22A, 23A, 24A, and 25A to the area of the front surface of the unit 2 (the left - right width of the unit 2 × the height of the unit 2), that is, the opening ratio which is the percentage of the total area / the area of the front surface, is 65% or more, preferably 75% or more. By using steel plates and steel materials, a high opening ratio can be obtained, ensuring a space for growth without unnecessarily enlarging the unit 2. In the unit 2 shown in FIG. 1, the opening ratio is approximately 80%, which is larger than the above - mentioned 75%. In this example, the front surface is the front surface of the unit 2, but it can also be other side surfaces.

[0060] Furthermore, by setting the lengths of the steel plates 10, 11, 12, 13, 14, and 15 to 1000 mm or less, the space 21A in the first stage 21 becomes a space with dimensions suitable for a single Japanese spiny lobster, and the length of the unit 2 does not become unnecessarily large with respect to the size of the parent shrimp. Moreover, since the unit 2 includes the first stage 21 to the fifth stage 25 and has five or more spaces 21A, 22A, 23A, 24A, 25A that become wider from top to bottom, it is provided with spaces corresponding to larvae, juvenile shrimp, and Japanese spiny lobster (adult) from the elvers, and is excellent in terms of cost. From current knowledge, it is preferable to have eight or fewer stages in terms of cost.

[0061] In addition, openings 31, 31 are provided in front of and behind the spaces 21A, 22A, 23A, 24A, 25A, respectively. In this example, the front and rear openings 31, 31 have the same shape, and the width W and height H of the opening 31 are larger in the lower stage than in the upper stage. Therefore, as they grow, they can move to the lower spaces 21A, 22A, 23A, 24A, which have wider openings 31 than the upper stage. Furthermore, since the spaces 21A, 22B, 23B, 24B, 25B in each stage are wider in the lower stage than in the upper stage, they can move to wider spaces corresponding to their body lengths as they grow and grow. Furthermore, since the spaces 21A, 22A, 23A, 24A, 25A are formed in a rectangular parallelepiped shape, the opening ratio can be increased compared to a cylindrical shape.

[0062] In addition, since the front-to-rear width and left-to-right width of the steel plate 10, which is the base plate of the unit 2, are larger than the height dimension of the unit 2, it can be stably installed.

Example

[0063] Figs. 7 to 8 show Example 2 of the present invention. The same parts as those in the above Example 1 are denoted by the same reference numerals, and the description thereof is omitted and will be described in detail. In this example, in the length in the front-rear direction, the upper stage is shorter than the lower stage. The widths of the steel plates 10, 11, 12, 13, 14, 15 in the left-right direction are the same as those in Example 1.

[0064] The steel plates 10, 11, 12, 13, 14, and 15 are formed such that the longitudinal lengths of the upper and lower steel plates 10 and 11 in the first stage 21 are the same, the upper steel plate 12 in the second stage 22 is shorter in the longitudinal direction than the lower steel plate 11, and similarly, the upper steel plates 13, 14, and 15 in the third, fourth, and fifth stages 23, 24, and 25 are formed shorter in the longitudinal direction than the lower steel plates 12, 13, and 14. On both sides of the upper surface length direction of the steel plates 11, 12, 13, and 14, step portions 8, 8 protruding forward and backward compared to the upper stage are formed. Also, the length of the space of each stage and the wall material 3 is the same as that of the upper steel plates 11, 12, 13, 14, and 15 of each stage.

[0065] With such a structure, it becomes possible to adjust the depth of the space. In the case of small individuals, since less depth is required, the width of the steel plate is widened as it goes downward.

[0066] Also, there may be cases where Puerulus larvae and juvenile shrimps fall from the upper step portion 8 to the lower step portion 8. Furthermore, when algae grow on the step portion 8, it becomes a feeding ground.

[0067] By making the space of the upper stage shorter than that of the lower stage in this way, it is possible to set the length of the space suitable for the growth stage. Also, by providing the step portion 8, what comes out from the openings on both sides of the upper space can fall onto the step portion 8 and move to the lower space. Furthermore, algae and the like are likely to adhere to the longitudinal ends of the steel plates 11, 12, 13, 14 and the step portion 8 continuous therewith, and the attached algae and the like protect the Puerulus and juvenile shrimps from external enemies.

[0068] Thus, in this embodiment, corresponding to the claims, it exhibits the same actions and effects as those in the above-described Embodiment 1. Also, in this example, by making the length of the upper space shorter than that of the lower space, the length of the space can be set, and a step portion 8 can be formed between the upper and lower stages. Due to this step portion 8, Puerulus larvae and juvenile shrimps can fall from above and move to the lower space, and when algae grow on the step portion 8, it becomes a feeding ground and a hiding place.

Embodiment

[0069] Figs. 9 to 14 show Example 3 of the present invention. The same parts as those in the above examples are denoted by the same reference numerals, and the description thereof will be omitted and described in detail. In this example, as in Example 2, in terms of the length in the front-rear direction, the upper stage is made shorter than the lower stage as in Example 2, and the widths in the left-right direction of the steel plates 10, 11, 12, 13, 14, and 15 are the same.

[0070] In the first, second, and third stages 21, 22, and 23 of the unit 2, the diagonally arranged diagonal wall members 3N, 3N are used, and the adjacent diagonal wall members 3N, 3N are arranged at an acute angle with respect to the front-rear direction. As shown in Fig. 10, in the first stage 21 of the unit 2, the wall members 3, 3 serving as outer walls are arranged at the edges 10S, 11S, 10S, 11S between the steel plates 10 and 11. Further, the unit 2 has an opening 51A on the front surface, and a plurality of one-side spaces 51 that are reduced from the front side, which is one side in the front-rear direction, to the rear side. In this example, three are provided. Furthermore, the unit 2 has openings 52A and 53A on the rear surface, and a plurality of other-side spaces 52 on the center side in the left-right direction and small other-side spaces 53 on both sides in the left-right direction that are reduced from the rear side, which is one side in the front-rear direction, to the front side. And the spaces 51, 52, 52 adjacent in the left-right direction are separated by a common diagonal wall member 3N. In Fig. 9, the gaps 6, openings 51A, 52A, 53A, water inlets 51B, 52B, 53B are represented by thick lines.

[0071] As shown in Fig. 10, in the first stage 21 of the unit 2, the paired diagonal wall members 3N, 3N are arranged such that the interval becomes narrower from the front side to the rear side, and a plurality of pairs of these paired diagonal wall members 3N, 3N are arranged adjacent to each other in the left-right direction. In this example, three pairs are arranged. Between these paired diagonal wall members 3N, 3N, the one-side space 51 that expands and opens from the rear side to the front side is formed, and between the adjacent pairs of diagonal wall members 3N, 3N, the other-side space 52 that expands and opens from the front side to the rear side is formed. The spaces 51 and 52 are adjacent and arranged in the left-right direction, and the one-side space 51 and the other-side space 52 have the same shape except that their orientations are different in the front-rear direction.

[0072] Also, as shown in Fig. 10, between the left and right wall members 3, 3 and the adjacent diagonal wall members 3N, 3N, the small other-side spaces 53, 53 that narrow from the rear side toward the front side are provided, and these left and right small other-side spaces 53, 53 have approximately half the size of the other-side space 52. Note that the steel materials used for the diagonal wall members 3N are flat steel, angle steel, channel steel, etc., and flat steel is used in the embodiment.

[0073] Also, at the rear end of the one-side space 51, a vertical water passage 51B is provided by the gap between the rear end edges of the paired diagonal wall members 3N, 3N. At the rear end of the other-side space 52, a vertical water passage 52B is provided by the gap between the rear end edges of the paired diagonal wall members 3N, 3N. At the front end of the small other-side space 53, a vertical water passage 53B is provided by the gap between the rear end edge of the wall member 3 and the adjacent diagonal wall member 3N. Note that the left and right widths of the water passages 51B, 52B, 53B are about 5 to 15 mm, and are shown in a larger ratio than the actual size.

[0074] Also, in the center of the length direction of the left and right wall members 3, 3, the water passage 4 is provided.

[0075] As shown in Fig. 11, the second stage 22 has four of the one-side spaces 51, four pairs of the paired diagonal wall members 3N, 3N, three of the other-side spaces 52, and two of the small other-side spaces 53. Also, as shown in Fig. 12, the third stage 23 has four pairs of the paired diagonal wall members 3N, 3N, five of the one-side spaces 51, four of the other-side spaces 52, and two of the small other-side spaces 53. And in the first stage 21 to the third stage 23, the spaces 51, 52, 53 that narrow toward the back from the opening are formed such that the lower stage is wider in both the left and right width and the front and back width than the upper stage, and the openings 51A, 52A, 53A are also formed such that the lower stage is wider in both the left and right width and the front and back width than the upper stage.

[0076] The diagonal wall members 3N, 3N forming a pair are arranged such that the interval narrows from the opening 51A side toward the back, and a plurality of pairs of these diagonal wall members 3N, 3N forming a pair are arranged adjacent to each other in the left - right direction. There are 3 pairs in the first stage 21, 4 pairs more than this in the second stage 22, and 5 pairs more than this in the third stage 23. As a result, a space 52 is formed in which the interval narrows from the opening 52A side toward the back.

[0077] As shown in Fig. 13, the fourth stage 24 of the unit 2 has 6 spaces 22A divided by the wall member 3, which is more than the space 51 in the third stage 23. The steel material used as the wall member 3 is the same as that in the first stage 21 except for different dimensions. Also, a partition 5 is provided at the center in the length direction of the space 22A. In this example, the space 21A is divided into two by the partition 5 to form divided spaces 22B, 22B. The steel material used for the partition 5 is flat steel, angle steel, channel steel, etc. The partition 5 is formed long in the left - right direction intersecting the wall member 3, and gaps 6, 6 are provided between both ends of the partition 5 and the inner surfaces of the wall members 3, 3 on both sides sandwiching the partition 5, and the flow of seawater is allowed by these gaps 6. Also, the water inlet 4 is provided at the center in the length direction of the wall member 3. In this example, the water inlet 4 and the gap 6 are provided in the wall member 3 at all stages.

[0078] As shown in Fig. 14, in the fifth stage 25 of the unit 2, the front - to - back width of the steel plate 14 is narrower than that of the steel plate 13, and it has 10 spaces 25A. The steel material used for the partition 5 is angle steel, round steel, etc. Angle steel or round steel is arranged in the vertical direction, and the gap 6 is provided between both left and right ends of this partition 5 and the inner surfaces of the wall members 3, 3 on both sides sandwiching the partition 5, and the flow of seawater is allowed by this gap 6.

[0079] Thus, openings 51A, 51A, 51A, 31, 31 are provided on the front surfaces of the first to fifth stages 21 to 25, and the width W and height H of these openings 51A, 51A, 51A, 31, 31 are larger in the lower stage than in the upper stage. Also, openings 52A, 52A, 52A, 31, 31 are provided on the rear surfaces of the first to fifth stages 21 to 25, and the width W and height H of these openings 51A, 51A, 51A are larger in the lower stage than in the upper stage. Further, the width W and height H of the openings 53A, 51A, 51A, 51A, 53A on the rear surfaces of the first to third stages 21 to 25 are larger in the lower stage than in the upper stage. Note that the opening area of the lower-stage openings may be made wider than that of the upper stage.

[0080] Then, Puerulus settles on the functional material 7 provided on the upper surface, and the settled Puerulus larvae grow in the order of juvenile shrimp and adult shrimp, and move to the large spaces 24B, 52, 52, 52 under the growth reef 1 according to their body lengths, gradually growing larger. In particular, in the first to third stages 21 to 23, the juvenile shrimp and adult shrimp enter backward into the diagonal wall materials 3N, 3N that narrow toward the back, and by contacting the diagonal wall materials 3N, 3N, it becomes a comfortable space for the juvenile shrimp and adult shrimp, and since the natural enemy octopus cannot enter, it becomes a safe space. Also, due to the shape that narrows toward the back of the space, the octopus has never entered first. To supplement, the octopus prefers a space where the back is wider than the entrance like an octopus pot. Note that approximately one adult shrimp grows in the space 21A of the first stage 21.

[0081] Thus, in this embodiment, corresponding to the claims, it exhibits the same actions and effects as the above-described embodiments. Also, in this example, due to the diagonal wall materials 3N, the spaces 51, 52, 53 become narrower toward the back, so natural enemies do not come from the back, and a comfortable space can be obtained for the Kuruma shrimp.

[0082] As an effect of the embodiment, between the diagonal wall members 3N, 3N, 3N that are obliquely inclined in one lateral direction on a plane, diagonal wall members 3N, 3N that are obliquely inclined in the other lateral direction are arranged, so that a substantially V-shaped one-side space 51 on the plane with a narrowing left-right interval from one side to the other side in the front-rear direction and a substantially V-shaped other-side space 52 on the plane with a narrowing left-right interval from the other side to one side can be easily formed. Further, due to the left and right wall members 3, 3 and the adjacent diagonal wall members 3N, 3N, the small other-side spaces 53, 53 that narrow from the rear side to the front side are provided, so that small parent shrimps and juvenile shrimps can inhabit and the space can be effectively utilized.

[0083] Also, by contacting the diagonal wall members 3N, 3N, it becomes a comfortable space for juvenile shrimps and parent shrimps, and since no natural enemy octopus can enter, a sense of security can be obtained, and an environment suitable for growth can be provided for Kuruma shrimp.

Embodiment

[0084] Figs. 15 to 17 show Embodiment 4 of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof is omitted and will be described in detail. In this example, the spaces 21A, 22A, 23A, 24A, 25A of the unit 2 shown in Embodiment 2 are vertically divided into two parts so that the height dimension decreases from one side in the length direction to the other side or from the other side in the length direction to one side. The left-right width of the spaces 21A, 22A, 23A, 24A, 25A is the same as that in Embodiment 1.

[0085] In order to divide the spaces 21A, 22A, 23A, 24A, 25A into two parts, diagonal steel plates 11N, 12N, 13N, 14N, 15N are provided at the height-direction centers of the 1st, 2nd, 3rd, 4th, and 5th steps 21, 22, 23, 24, 25, and upper spaces 21U, 22U, 23U, 24U, 25U and lower spaces 21S, 22S, 23S, 24S, 25S that are divided into two parts in the height direction are formed in each step. Note that the diagonal steel plates 11N, 12N, 13N, 14N, 15N are also steel plates provided in multiple steps.

[0086] And each divided space in each stage has a size obtained by roughly dividing the spaces 21A, 22A, 23A, 24A, 25A in the height direction into two. Also, the diagonal steel plates 11N, 12N, 13N, 14N, 15N are inclined from the front side, which is one side in the front-rear direction, toward the rear side.

[0087] As shown in FIG. 17 and the like, the wall materials 3 on both left and right sides and the central wall material 3 provided with the water inlets 4 are divided into an upper wall material 3U and a lower wall material 3S in the vertical direction, and the upper wall material 3U and the lower wall material 3S are attached so as to sandwich the diagonal steel plates 11N, 12N, 13N, 14N, 15N. Also, the upper edge of the upper wall material 3U and the lower edge of the lower wall material 3S are attached to the lower surface of the corresponding upper steel plate and the upper surface of the lower steel plate, respectively, in the same manner as in the first embodiment.

[0088] And at the lower side of each stage on the front surface of the unit 2, between the upper diagonal steel plates 11N, 12N, 13N, 14N, 15N at the center in the height direction, the lower steel plates 10, 11, 12, 13, 14, and the adjacent wall materials 3, 3 on the left and right, wide openings 61 which are entrances and exits of the lower spaces 21S, 22S, 23S, 24S, 25S are provided. As the diagonal steel plates 11N, 12N, 13N, 14N, 15N become lower toward the rear side from this opening 61, the height of the lower space 21S becomes lower, and an opening 62 narrower than the opening 61 is provided at the lower side of the rear surface of the unit 2. Note that the vertical width of the opening 62 is about 5 to 15 mm.

[0089] Also, at the upper side of each stage on the rear surface of the unit 2, between the upper steel plates 11, 12, 13, 14, 15, the diagonal steel plates 11N, 12N, 13N, 14N, 15N at the center in the height direction, and the adjacent wall materials 3, 3 on the left and right, wide openings 61 which are entrances and exits of the upper spaces 21U, 22U, 23U, 24U, 25U are provided. As the diagonal steel plates 11N, 12N, 13N, 14N, 15N become higher toward the front side from this opening 61, the height of the upper spaces 21U, 22U, 23U, 24U, 25U becomes lower, and an opening 62 narrower than the opening 61 is provided at the upper side of the front surface of each stage of the unit 2.

[0090] Thus, in each stage of the unit 2, there are provided lower spaces 21S, 22S, 23S, 24S, 25S whose cross-sections shrink from the front side, which is one side in the front-rear direction, toward the rear side, and upper spaces 21U, 22U, 23U, 24U, 25U whose cross-sections shrink from the rear side, which is one side in the front-rear direction, toward the front side.

[0091] Then, pururus attaches to the functional material 7 provided on the upper surface. The attached pururus larvae grow in the order of juvenile shrimp, adult shrimp, move to the large upper space and the lower side under the growth reef 1 according to their body lengths, and gradually grow larger. Also, due to the structure that narrows toward the back, the juvenile shrimp and adult shrimp enter backward and come into contact with the upper and lower steel plates and the diagonal steel plates 11N, 12N, 13N, which creates a comfortable space for the juvenile shrimp and adult shrimp and a safe space because the natural enemy octopus cannot enter. Note that approximately one adult shrimp grows in the spaces 21U, 21S of the first stage 21.

[0092] Thus, in this embodiment, corresponding to the claims, it exhibits the same actions and effects as the above-described embodiments. Also, in this example, due to the diagonal steel plates 11N, 12N, 13N, 14N, 15N, the upper spaces 21U~25U and the lower spaces 21S to 25S become lower and narrower toward the back, so natural enemies cannot come from the back, and a comfortable space can be obtained for the kuruma shrimp.

[0093] Also, as an effect of the embodiment, diagonal steel plates 11N~15N that slope downward obliquely from one side in the front-rear direction to the other side are provided at the center in the height direction of the wall material 3 of each stage, and by dividing the space vertically into two, the upper spaces 21U~25U and the lower spaces 21S~25S that become lower and narrower toward the back can be easily formed.

Embodiment

[0094] FIG. 18 shows Embodiment 5 of the present invention. The same parts as those in the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted and will be described in detail. In this example, the spaces 21A, 22A, 23A, 24A, 25A are divided into three in the length direction.

[0095] Taking the space 25A as an example, the space 21A is divided into three by a plurality (two) of partitions 5 to form divided spaces 22C, 22C, and 22C. In this example, the length of the space 21A is divided into three equal parts. However, mainly in the fifth stage 25, purples live in the divided spaces 22C, 22C on both sides. Therefore, the partitions 5, 5 can be provided so that the divided spaces 22C, 22C on both sides have appropriate lengths.

[0096] Also, similar to the above-described embodiments, a water passage port 4 is provided at the center in the length direction of the wall material 3, and gaps 6, 6 are provided between the wall materials 3, 3 and the partition 5. Therefore, the resistance due to the ocean current can be reduced, and the retention of seawater in the space 22A can be prevented.

[0097] Thus, in this embodiment, the same operational effects as those of the above-described embodiments are achieved. Also, in this example, the lengths of the divided spaces 22C, 22C located on the opening side at the end in the length direction of the space can be set to desired lengths by the partitions 5.

Embodiment

[0098] FIGS. 19 and 20 show Embodiment 6 of the present invention. The same parts as those in the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted and will be described in detail. In this example, an example in which the prawn breeding reef 1 is constituted by a plurality of units 2 is shown.

[0099] The breeding reef 1 in this example is constituted by arranging a plurality of units 2 of Embodiments 1 to 5 on a base plate 41 made of a steel plate or the like. A plurality of units 2 are arranged and attached diagonally on the base plate 41 having a square planar shape. In this example, the same unit 2 is used a plurality of times, but units 2 of different embodiments may be used in combination.

[0100] Specifically, the units 2 are respectively arranged on the four corner portions of the base plate 41, one unit 2 is arranged at the center of the base plate 41, and two units 2, 2 are arranged side by side between the central unit 2 and the corner units 2, and the spaces of all the units 2 are directed in the same direction.

[0101] In addition, compared with the total area of the steel plates 10 of the plurality of units 2, the area of the base plate 41 is large, and the base plate 41 is thicker than the steel plate 10 and heavier. Therefore, when it is set on a rocky place or the like, it has even better stability.

[0102] Thus, in this embodiment, the same operational effects as those of the above-described embodiments are achieved. In this example, corresponding to claim 5, since a plurality of the units 2 for the lobster breeding reef described in any one of claims 1 to 4 are arranged on the base plate 41 made of a steel plate, by combining a plurality of the units 2, the lobster breeding reef 1 of a required size can be easily manufactured.

[0103] In addition, as an effect in the embodiment, if the base plate 41 rusts, algae will adhere, and other base plates 41 other than the unit 2 can also hide from or be preyed on by algae, and the puerulus that has settled on the base plate 41 can grow within the unit 2. In addition, even other than the base plate 41, when the steel plate and the steel material rust, it becomes easy for algae and the like to adhere.

Embodiment

[0104] FIG. 21 shows Embodiment 7 of the present invention. The same parts as those in the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted and will be described in detail. In this example, a modified example of the wall material 3 is shown.

[0105] In this example, the wall material 3 of the fifth stage 25 is an angle steel. This angle steel is arranged in the longitudinal direction of the unit 2, and the space 25A is provided between the left and right angle steels. The width of this space 25A is the interval between the vertical outer surfaces of the angle steels adjacent in the left-right direction. In addition, the height H of the space 25A is the height dimension between the lower surface of the upper steel plate 15 and the upper surface of the lower steel plate 14. The height of each stage is also the said height dimension.

[0106] The wall material 3 of the fourth stage 24 is a channel steel having a pair of single parts 3A and 3B. The outer surface of the horizontally arranged single part 3B is fixed to the upper surface of the lower steel plate 13, and the upper end (tip) of the vertically arranged single part 3A is fixed to the lower surface of the upper steel plate 14.

[0107] Then, arrange the channel steel in the longitudinal direction of Unit 2, provide the space 24A between the left and right channel steels, and the width W of this space 24A is the distance between the outer surfaces of the vertical single parts 3A, 3A. Incidentally, channel steel can be used for the wall materials 3 of the second stage 22 to the fourth stage 24.

[0108] The wall material 3 of the third stage 23 is a grooved steel, which has flange parts 3D, 3D in the direction intersecting the web part 3C at the upper and lower (ends) of the vertically arranged web part 3C. Fix the outer surface of the upper flange part 3D to the lower surface of the upper steel plate 13, and fix the outer surface of the lower flange part 3D to the upper surface of the lower steel plate 12. Then, arrange the grooved steel in the longitudinal direction of Unit 2, provide the space 23A between the left and right grooved steels, and the width W of this space 23A is the distance between the outer surfaces of the vertical web parts 3C, 3C. Incidentally, channel steel can be used for the wall materials 3 of the second stage 22 to the fourth stage 24.

[0109] Incidentally, in FIG. 21, a flat steel is illustrated for the wall material 3 of the second stage 22. Also, at least any one of channel steel, grooved steel, and flat steel may be used for the wall materials 3 of the second stage 22 to the fourth stage 24. In this case, it is preferable that the wall materials 3 of each stage use the same steel material, but different steel materials may be combined and used. For example, channel steel can be appropriately selected, such as using channel steel for the wall materials 3 at both side edges 10S and using flat steel for the central wall material 3.

[0110] Thus, in this embodiment, corresponding to the claims, the same operational effects as those of the above embodiments are achieved, and also, various steel materials can be used for the wall material 3 and the partition 5 as in this example.

Embodiment

[0111] FIG. 22 shows Embodiment 8 of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof is omitted and will be described in detail. In this example, a modified example of Unit 2 is shown.

[0112] In this example, for the unit 2, a steel plate 16 for a wall, which is a steel material, is attached to the end faces of the left and right edges 10S, 11S, 12S, 13S, 14S, 15S of the steel plates 10, 11, 12, 13, 14, 15 at each stage. This steel plate 16 for a wall has the same height and front-back width as the unit 2 and closes the left and right sides of the unit 2. In this way, the outer wall materials for all the stages are constituted by a single steel plate 16 for a wall.

[0113] Thus, in this embodiment, corresponding to the claims, the steel plates 10, 11, 12, 13, 14, 15 are provided in multiple stages at intervals in the vertical direction, and a plurality of wall materials 3, which are steel materials, are arranged between the upper and lower steel plates 10, 11, 12, 13, 14, 15 except for both sides in the left and right directions of the unit 2 to form a plurality of spaces 21A, 22A, 23A, 24A, 25A between the upper and lower steel plates 10, 11, 12, 13, 14, 15. Therefore, the same effects as those of the above embodiments are achieved. Also, since the outer wall materials for all the stages are constituted by a single steel plate 16 for a wall as in this example, the wall material 3 provided between the upper and lower steel plates at the left and right ends of the unit 2 becomes unnecessary.

[0114] Note that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the invention. For example, a diagonal wall material of Example 4 may be provided in the unit shown in Example 1 to provide an upper space and a lower space. Also, the dimensions shown in the examples are merely examples and are not limited thereto. Further, in the examples, the case where the left - right widths of the spaces at each stage are equal is shown, but the left - right widths of the spaces at each stage may be somewhat different. In this case as well, it is preferable that the left - right width of the space in the lower stage is wider than the left - right width of the space in the upper stage. That is, the left - right width of the narrowest space on the left and right in the lower stage may be made wider than the left - right width of the widest space on the left and right in the upper stage. Also, in the examples, the steel plate 10 and the base plate 41 are shown as having a square planar shape, but they may be rectangular or other shapes. Furthermore, in Example 6, instead of providing the steel plate 10 in the unit 2, the wall material 3 of the first - stage 21 etc. may be attached to the base plate, and a space 21A may be provided between the upper surface of the base plate 41 and the lower surface of the steel plate 11. Also, as long as the functional material is more likely to allow the Pu-erh to settle, that is, more likely to catch the Pu-erh, than the upper surface of the top - most steel plate, various materials can be used. Also, in Example 6, a square base plate was exemplified, but an X - shaped base plate to which a plurality of steel plates 10... can be attached may be used. Furthermore, it goes without saying that a functional material can be provided in Examples 2 to 8. Also, in Example 6, an example of arranging 7 diagonal units on a square base plate was shown, but the number of units on the diagonal may be an odd number such as 5, 3, 9, 11, or 13 or more. Also, the aperture ratio of the unit may be different between the front and the rear. In this case, it is preferable that the aperture ratio of at least one of the front and the rear of the unit is not less than the predetermined value exemplified in the examples. That is, the aperture ratio of one of the front and the rear of the unit may be not less than the predetermined value and the aperture ratio of the other of the front and the rear may be less than the predetermined value. Furthermore, it is more preferable that the aperture ratios of both the front and the rear of the unit are not less than the predetermined value. Also, it is preferable that at least the aperture ratio of the surface where the aperture ratio of the unit is maximum is not less than the predetermined value. Furthermore, in embodiments other than Example 1 as well, it is preferable to set the aperture ratio to not less than the predetermined value.

Explanation of Signs

[0115] 1 Japanese spiny lobster breeding reef 2 Unit (unit for Japanese spiny lobster breeding reef) 3 Wall material (steel material) 7 Functional material 10 Steel plate 11 Steel plate 12 Steel plate 13 Steel plate 14 Steel plate 15 Steel plate 21 First stage 21A Space 21U Upper space 21S Lower space 22 Second stage 22A Space 22B Divided space 22C Divided space 22U Upper space 22S Lower space 23 Third stage 23A Space 23B Divided space 23U Upper space 23S Lower space 24 Fourth stage 24A Space 24B Divided space 24U Upper space 24S Lower space 25 Fifth stage (uppermost stage) 25A Space 25B Divided space 25U Upper space 25S Lower space 41 Base plate

Claims

1. Steel plates are provided in multiple stages at intervals vertically, a plurality of steel materials are arranged between the upper and lower steel plates to form a plurality of spaces between the upper and lower steel plates, and the unit for an Isaei shrimp breeding reef is characterized by having spaces of different sizes.

2. Steel plates are provided in multiple stages at intervals vertically, and the interval in the lower stage is provided wider than the interval in the upper stage, a plurality of wall materials made of steel materials are arranged at intervals in the left - right direction between the upper and lower steel plates, and a plurality of spaces are arranged side by side between the upper and lower steel plates by these wall materials. The unit for an Isaei shrimp breeding reef is characterized by this.

3. The unit for an Isaei shrimp breeding reef according to claim 1 or 2, wherein the space shrinks from one side to the other side in the front - rear direction.

4. The unit for an Isaei shrimp breeding reef according to claim 1 or 2, wherein a functional material for Puellulus attachment is provided on the upper surface of the steel plate above the uppermost stage.

5. An Isaei shrimp breeding reef is characterized in that a plurality of the units for an Isaei shrimp breeding reef according to claim 1 or 2 are arranged on a base plate made of a steel plate.

Images