Settlement system and settlement method

Abstract

To allow zoospores to efficiently settle to a settlement tool.SOLUTION: A settlement device 1 includes a bottomed tank 2, a settlement tool 3 on which zoospores Q released from a mother algae P can settle, and a vertical light source 5 capable of irradiating light from below toward the zoospores Q. The settlement device 1 includes: a plurality of brightness detectors 7 arranged above the bottomed tank 2 and capable of detecting the brightness distribution of the vertical light source 5; a distribution calculation unit 21 that calculates the three-dimensional distribution of the zoospores Q based on the brightness detection results of the plurality of brightness detectors 7; and a swimming control unit 22 that controls the swimming of the zoospores Q so that the zoospores Q swim toward the settlement tool 3 based on the three-dimensional distribution of the zoospores Q.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an attachment system and an attachment method.

Background Art

[0002] Patent Document 1 discloses that a growth member body for growing algae by attaching spores of algae on the surface is constituted by an inorganic filler, so that the growth member body can be easily manufactured by injection molding.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is still room for improvement in efficiently attaching zoospores to a substratum in a terrestrial aquarium.

Means for Solving the Problems

[0005] An attachment system is provided, which includes a bottomed water tank, a substratum on which zoospores released from mother algae can attach, and a first light source capable of irradiating light downward toward the zoospores. According to the above configuration, due to the negative phototaxis of the zoospores, it is possible to suppress the sedimentation of the zoospores and their deposition on the bottom of the bottomed water tank, so that the zoospores can be efficiently attached to the substratum.

[0006] A plurality of luminance detectors arranged above the bottomed water tank and capable of detecting the luminance distribution of the first light source, a distribution calculation means for calculating the three-dimensional distribution of the swimmers based on the luminance detection results of the plurality of luminance detectors, at least one second light source provided on the outer periphery of the bottomed water tank, and using the at least one second light source, based on the three-dimensional distribution of the swimmers, swimming control means for controlling the swimming of the swimmers so that the swimmers swim toward the landing tool may be included. According to the above configuration, since the swimmers swim toward the landing tool, the swimmers can be efficiently hatched on the landing tool.

[0007] The swimming control means may calculate the dense coordinates where the swimmers are most dense based on the three-dimensional distribution of the swimmers, and control the swimming of the swimmers so that the swimmers dense at the dense coordinates swim toward the landing tool. According to the above configuration, the swimmers can be more efficiently hatched on the landing tool.

[0008] The swimming control means may control the swimming of the swimmers so that the swimmers dense at the dense coordinates swim toward the landing tool by moving the at least one second light source. According to the above configuration, due to the negative phototaxis of the swimmers, the swimming of the swimmers can be controlled so that the swimmers dense at the dense coordinates swim toward the landing tool.

[0009] The at least one second light source includes a plurality of second light sources, and the swimming control means may control the swimming of the swimmers so that the swimmers dense at the dense coordinates swim toward the landing tool by selecting the second light source used for irradiation from among the plurality of second light sources. According to the above configuration, due to the negative phototaxis of the swimmers, the swimming of the swimmers can be controlled so that the swimmers dense at the dense coordinates swim toward the landing tool.

[0010] The bottomed water tank may have a circular bottom plate and a cylindrical peripheral wall protruding upward from the bottom plate.

[0011] The attachment tool may be arranged at the center of the bottomed water tank in a plan view.

[0012] The attachment tool may be a twisted yarn.

[0013] An attachment method is provided in which an attachment tool on which zoospores released from the mother alga can settle is provided in a bottomed water tank, breeding water is injected into the bottomed water tank, the mother alga is placed in the bottomed water tank, and light is irradiated from below toward the zoospores released from the mother alga. According to the above method, due to the negative phototaxis of the zoospores, it is possible to suppress the sedimentation of the zoospores and their deposition on the bottom of the bottomed water tank, so that the zoospores can be efficiently settled on the attachment tool.

Advantages of the Invention

[0014] According to the present disclosure, zoospores can be efficiently settled on an attachment tool in an onshore water tank.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0016] Hereinafter, the present invention will be described through embodiments of the invention, but the invention according to the claims is not limited to the following embodiments. Also, not all of the configurations described in the embodiments are essential as means for solving the problems. For the sake of clarity of explanation, the following description and drawings have been appropriately omitted and simplified. In each drawing, the same reference numerals are assigned to the same elements, and duplicate explanations are omitted as necessary.

[0017] FIG. 1 shows a perspective view of the attachment device 1. FIG. 2 shows a side cross-sectional view of the attachment device 1. The attachment device 1 is a specific example of an attachment system. The attachment device 1 is a device for causing zoospores of seaweed to attach to an attachment tool in a land-based water tank. Note that "attachment" means that zoospores attach to an attachment tool and grow. When the zoospores attach to the attachment tool, they germinate and become male and female gametophytes. Therefore, in this specification, the attachment of zoospores to an attachment tool and the attachment of zoospores to an attachment tool are considered to substantially mean the same thing.

[0018] The seaweed is any one of green algae, brown algae, and red algae. In this embodiment, the seaweed is typically brown algae such as kelp and wakame. Instead of this, the seaweed may be kombu, wakame, hijiki, or mozuku. As described above, seaweed has the property of growing through zoospores, which are spores having flagella and capable of swimming in water.

[0019] As shown in FIG. 1, the attachment device 1 includes a bottomed water tank 2, an attachment tool 3, a mother-algae holder 4, a vertical light source 5, a horizontal light source 6, a plurality of luminance detectors 7, a moving device 8, a head-shaking device 9, and an attachment control device 10.

[0020] The bottomed water tank 2 is a specific example of a land-based water tank. The bottomed water tank 2 is formed in a circular shape in plan view. That is, the bottomed water tank 2 has a circular bottom plate 2a and a cylindrical peripheral wall 2b that projects upward from the outer peripheral edge of the bottom plate 2a. However, alternatively, the bottomed water tank 2 may be formed in a rectangular shape in plan view. The diameter of the bottomed water tank 2 is typically about 1 meter to 2 meters, but is not limited thereto. The bottomed water tank 2 is typically made of an acrylic resin having high light transmittance. However, the bottomed water tank 2 may be made of glass, or a part thereof may be made of acrylic resin and another part may be made of glass. Seawater K is injected into the bottomed water tank 2. Seawater K is a specific example of breeding water having a predetermined salt concentration.

[0021] The attachment tool 3 is composed of a material suitable for the attachment of the spermatozoa. The attachment tool 3 is typically composed of a spun yarn made of cotton or Cremona (registered trademark) wound around a frame a plurality of times. However, alternatively, the attachment tool 3 may be made of mortar or ceramic. The attachment tool 3 is disposed at the center of the bottomed water tank 2 in plan view. Specifically, the attachment tool 3 is fixed to the bottom plate 2a of the bottomed water tank 2 at the center of the bottomed water tank 2 in plan view. Typically, the attachment tool 3 is installed so as to extend upward from the bottom plate 2a of the bottomed water tank 2. The attachment tool 3 is also called an attachment substrate.

[0022] The mother alga holder 4 has sufficient weight to hold the mother alga P while preventing the mother alga P from floating. The mother alga holder 4 is disposed near the peripheral wall 2b of the bottomed water tank 2 in plan view. Specifically, the mother alga holder 4 is installed on the bottom plate 2a of the bottomed water tank 2 near the peripheral wall 2b of the bottomed water tank 2 in plan view. Note that the mother alga holder 4 may be fixed to the bottom plate 2a of the bottomed water tank 2.

[0023] The vertical light source 5 is a specific example of the first light source. The vertical light source 5 irradiates visible light downward toward the zoospore Q released from the mother alga P. For this reason, the vertical light source 5 is disposed below the bottom plate 2a of the bottomed water tank 2. The vertical light source 5 is disposed so as to face the bottom plate 2a of the bottomed water tank 2 in the vertical direction. The vertical light source 5 is typically configured to be circular in plan view. In the present embodiment, the vertical light source 5 is configured by a surface-emitting LED panel for plant cultivation. The vertical light source 5 may be configured by arranging a plurality of surface-emitting LED panels, or may be configured by a single surface-emitting LED panel. The vertical light source 5 typically irradiates visible light with a wavelength of 660 nanometers, which is suitable for plant growth, downward from below toward the bottom plate 2a of the bottomed water tank 2. Thereby, due to the negative phototaxis of the zoospore Q, it is possible to prevent the zoospore Q from sedimenting and depositing on the bottom plate 2a of the bottomed water tank 2. As an example of the surface-emitting LED panel, M-04319 manufactured by Akizuki Electronics Trading Co., Ltd. can be mentioned. Instead of disposing the vertical light source 5 below the bottom plate 2a of the bottomed water tank 2, the vertical light source 5 may be disposed within the bottomed water tank 2 and on the upper surface of the bottom plate 2a of the bottomed water tank 2.

[0024] The horizontal light source 6 is a specific example of the second light source. The horizontal light source 6 is provided on the outer periphery of the bottomed water tank 2 and irradiates visible light toward the zoospore Q. The horizontal light source 6 is provided on the outer periphery of the bottomed water tank 2 and irradiates visible light toward the landing tool 3. Specifically, the horizontal light source 6 is provided radially outward of the bottomed water tank 2 from the peripheral wall 2b of the bottomed water tank 2. The horizontal light source 6 is disposed so as to face the peripheral wall 2b of the bottomed water tank 2 in the radial direction of the bottomed water tank 2. The horizontal light source 6 is configured to be movable along the peripheral wall 2b of the bottomed water tank 2 by a moving device 8. That is, the horizontal light source 6 is movable in an arc shape along the peripheral wall 2b of the bottomed water tank 2 in plan view and is movable in the vertical direction in side view. The moving device 8 typically includes a guide rail, a device body movable along the guide rail, and a drive source such as a motor. The orientation of the horizontal light source 6 is configured to be adjustable by the swing device 9. That is, the elevation angle of the direction in which the horizontal light source 6 irradiates visible light is configured to be adjustable by the swing device 9. The swing device 9 typically consists of a device body that holds the horizontal light source 6 so that the horizontal light source 6 can pitch and turn, and a drive source such as a motor. The horizontal light source 6 is typically a light guide plate surface light source. As an example of the light guide plate surface light source, A4H-L1116-4S8 manufactured by Lumitecno Co., Ltd. can be mentioned. The horizontal light source 6 is arranged so as not to enter the angular fields of the two luminance detectors 7.

[0025] A plurality of luminance detectors 7 are arranged above the bottomed water tank 2 to detect the luminance distribution of the vertical light source 5. In the present embodiment, the plurality of luminance detectors 7 includes two luminance detectors 7. As shown in FIGS. 1 and 2, the two luminance detectors 7 are arranged apart from each other in a plan view. Typically, the two luminance detectors 7 are arranged point-symmetrically with respect to the center of the bottomed water tank 2 in a plan view. Each luminance detector 7 is arranged radially inward of the circumferential wall 2b of the bottomed water tank 2 in a plan view. Each luminance detector 7 is arranged so that the vertical light source 5 fits within its angular field. As an example of each luminance detector 7, BM-7AC manufactured by Topcon Techno House Co., Ltd. can be mentioned. Each luminance detector 7 outputs the luminance detection result to the spawn control device 10. The luminance detection result is data indicating the luminance distribution of the vertical light source 5 observed by each luminance detector 7. Specifically, the luminance detection result is composed of luminance values per unit cubic angle as seen from each luminance detector 7.

[0026] FIG. 3 shows a block diagram of the spawn device 1. As shown in FIG. 3, the spawn control device 10 has a processor 10a and a memory 10b. The processor 10a can access the memory 10b. The processor 10a reads and executes the program stored in the memory 10b. Thereby, the processor 10a causes hardware such as the processor 10a and the memory 10b to function as a luminance detection result acquisition unit 20, a distribution calculation unit 21, and a swimming control unit 22.

[0027] The luminance detection result acquisition unit 20 is a specific example of the luminance detection result acquisition means. The luminance detection result acquisition unit 20 acquires luminance detection results from two luminance detectors 7.

[0028] The distribution calculation unit 21 is a specific example of the distribution calculation means. The distribution calculation unit 21 calculates the three-dimensional distribution of the swimming particles Q based on the luminance detection results of the two luminance detectors 7. Specifically, the distribution calculation unit 21 geometrically calculates the three-dimensional distribution of the swimming particles Q in the bottomed water tank 2 based on the installation position coordinates of the two luminance detectors 7, the installation postures of the two luminance detectors 7, and the luminance detection results. The distribution calculation unit 21 calculates the three-dimensional distribution of the swimming particles Q as described above by utilizing the characteristic that the light irradiated from the vertical light source 5 is blocked by the swimming particles Q. For example, the first straight line connecting one luminance detector 7 and the lowest luminance portion of the luminance distribution of the vertical light source 5 observed from the luminance detector 7, the second straight line connecting the other luminance detector 7 and the lowest luminance portion of the luminance distribution of the vertical light source 5 observed from the luminance detector 7, and the coordinates where they intersect suggest the coordinates where the swimming particles Q are most concentrated. The three-dimensional distribution of the swimming particles Q may indicate the three-dimensional distribution of the bottomed water tank 2 in the entire space inside the bottomed water tank 2, or may indicate only the coordinates where the swimming particles Q are most concentrated in the bottomed water tank 2.

[0029] The swimming control unit 22 is a specific example of the swimming control means. The swimming control unit 22 controls the swimming of the swimming particles Q based on the three-dimensional distribution of the swimming particles Q calculated by the distribution calculation unit 21 so that the swimming particles Q swim toward the landing tool 3. Specifically, it is as follows.

[0030] First, as shown in FIG. 2, the swimming control unit 22 calculates the concentrated coordinates R where the swimming particles Q are most concentrated based on the three-dimensional distribution of the swimming particles Q. The concentrated coordinates R can also be said to be the minimum value of the luminance distribution. Next, the swimming control unit 22 controls the swimming of the swimming particles Q by moving the horizontal light source 6 so that the swimming particles Q concentrated at the concentrated coordinates R swim toward the landing tool 3.

[0031] Here, due to the negative phototaxis of the zoospores Q, the zoospores Q swim away from the horizontal light source 6. Therefore, the swimming control unit 22 controls the moving device 8 so that the horizontal light source 6 is located on the side opposite to the landing tool 3 with the concentration coordinate R in between, and the horizontal light source 6, the concentration coordinate R, and the landing tool 3 are aligned in a straight line, and moves the horizontal light source 6. Note that the horizontal light source 6, the concentration coordinate R, and the landing tool 3 being aligned in a straight line typically means that the central coordinates of the horizontal light source 6, the concentration coordinate R, and the landing tool 3 are aligned in a straight line. Further, the swimming control unit 22 controls the head shaking device 9 so that the horizontal light source 6 irradiates light toward the zoospores Q concentrated at the concentration coordinate R, and adjusts the posture of the horizontal light source 6. As a result, more zoospores Q will swim toward the landing tool 3, so that the zoospores Q can be efficiently germinated on the landing tool 3.

[0032] Next, with reference to FIG. 4, a germination method using the germination device 1 will be described.

[0033] S100: First, the landing tool 3 is installed in the bottomed water tank 2.

[0034] S110: Next, seawater K is injected into the bottomed water tank 2.

[0035] S120: Next, after attaching the mother alga holder 4 to the mother alga P, the mother alga P is put into and installed in the bottomed water tank 2. Thereby, zoospores are released from the mother alga P.

[0036] S130: Next, the germination control device 10 turns on the vertical light source 5. Thereby, the vertical light source 5 irradiates visible light from below toward the zoospores Q released from the mother alga P.

[0037] S140: Next, the luminance detection result acquisition unit 20 of the germination control device 10 acquires luminance detection results from the two luminance detectors 7.

[0038] S150: Next, the distribution calculation unit 21 of the attachment control device 10 calculates the three-dimensional distribution of the zoospores Q based on the luminance detection results of the two luminance detectors 7.

[0039] S160: Next, the swimming control unit 22 of the attachment control device 10 controls the swimming of the zoospores Q so that the zoospores Q swim toward the attachment tool 3 based on the three-dimensional distribution of the zoospores Q calculated by the distribution calculation unit 21. Specifically, the swimming control unit 22 of the attachment control device 10 controls the moving device 8 to move the horizontal light source 6 so that the horizontal light source 6, the density coordinate R, and the attachment tool 3 are aligned in a straight line (S170). Further, the swimming control unit 22 of the luminance detection result acquisition unit 20 controls the head shaking device 9 to adjust the posture of the horizontal light source 6 so that the horizontal light source 6 irradiates light toward the zoospores Q concentrated at the density coordinate R (S180). Then, the swimming control unit 22 of the attachment control device 10 turns on the horizontal light source 6 (S190). As a result, the horizontal light source 6 irradiates visible light from the side toward the zoospores Q released from the parent alga P. In response to this, the zoospores Q released from the parent alga P start swimming toward the attachment tool 3.

[0040] S200: Next, the luminance detection result acquisition unit 20 of the attachment control device 10 acquires the luminance detection results from the two luminance detectors 7.

[0041] S210: Next, the distribution calculation unit 21 of the attachment control device 10 calculates the three-dimensional distribution of the zoospores Q based on the luminance detection results of the two luminance detectors 7.

[0042] S220: Next, the swimming control unit 22 of the settlement control device 10 controls the swimming of the swarmers Q so that the swarmers Q swim toward the landing tool 3 based on the three-dimensional distribution of the swarmers Q calculated by the distribution calculation unit 21. Specifically, the swimming control unit 22 of the settlement control device 10 controls the moving device 8 to move the horizontal light source 6 so that the horizontal light source 6, the density coordinates R, and the landing tool 3 are aligned in a straight line (S230). Further, the swimming control unit 22 of the luminance detection result acquisition unit 20 controls the head shaking device 9 to adjust the posture of the horizontal light source 6 so that the horizontal light source 6 irradiates light toward the swarmers Q concentrated at the density coordinates R (S240). Then, the settlement control device 10 returns the process to step S200.

[0043] The first embodiment of the present disclosure has been described above. The above first embodiment has the following features.

[0044] The settlement device 1 (settlement system) includes a bottomed water tank 2, a landing tool 3 on which the swarmers Q released from the mother alga P can settle, and a vertical light source 5 (first light source) that can irradiate light downward toward the swarmers Q. According to the above configuration, due to the negative phototaxis of the swarmers Q, it is possible to suppress the swarmers Q from settling and accumulating on the bottom of the bottomed water tank 2, so that the swarmers Q can be efficiently settled on the landing tool 3.

[0045] Further, the settlement device 1 includes a plurality of luminance detectors 7 disposed above the bottomed water tank 2 and capable of detecting the luminance distribution of the vertical light source 5, a distribution calculation unit 21 (distribution calculation means) that calculates the three-dimensional distribution of the swarmers Q based on the luminance detection results of the plurality of luminance detectors 7, a horizontal light source 6 (at least one second light source) provided on the outer periphery of the bottomed water tank 2, and a swimming control unit 22 (swimming control means) that uses the horizontal light source 6 to control the swimming of the swarmers Q so that the swarmers Q swim toward the landing tool 3 based on the three-dimensional distribution of the swarmers Q. According to the above configuration, since the swarmers Q swim toward the landing tool 3, the swarmers Q can be efficiently settled on the landing tool 3.

[0046] The swimming control unit 22 calculates the density coordinates R where the swimmers Q are most concentrated based on the three-dimensional distribution of the swimmers Q. The swimming control unit 22 controls the swimming of the swimmers Q so that the swimmers Q concentrated at the density coordinates R swim toward the implant 3. According to the above configuration, the swimmers Q can be more efficiently implanted on the implant 3.

[0047] The swimming control unit 22 controls the swimming of the swimmers Q by moving the horizontal light source 6 so that the swimmers Q concentrated at the density coordinates R swim toward the implant 3. According to the above configuration, due to the negative phototaxis of the swimmers Q, the swimming of the swimmers Q can be controlled so that the swimmers Q concentrated at the density coordinates R swim toward the implant 3.

[0048] The bottomed water tank 2 has a circular bottom plate 2a and a cylindrical peripheral wall 2b protruding upward from the bottom plate 2a.

[0049] The implant 3 is disposed at the center of the bottomed water tank 2 in plan view.

[0050] The implant 3 is typically a twisted thread.

[0051] The implantation of the swimmers Q is performed by the following method. An implant 3 on which the swimmers Q released from the parent alga P can be implanted is provided in the bottomed water tank 2 (S100). Seawater K as breeding water is injected into the bottomed water tank 2 (S110). The parent alga P is placed in the bottomed water tank 2 (S120). Light is irradiated from below toward the swimmers Q released from the parent alga P (S130). According to the above method, due to the negative phototaxis of the swimmers Q, it is possible to suppress the swimmers Q from settling and depositing on the bottom of the bottomed water tank 2, so that the swimmers Q can be efficiently implanted on the implant 3.

[0052] (Second Embodiment) Next, a second embodiment of the present disclosure will be described. Hereinafter, the description will focus on the differences between the present embodiment and the above first embodiment, and overlapping descriptions will be omitted.

[0053] As shown in FIGS. 1 and 2, in the first embodiment, the position and orientation of the horizontal light source 6 were adjusted so that the swimmer Q would move toward the landing tool 3.

[0054] In contrast, in the present embodiment, as shown in FIG. 5, the culturing device 1 includes a plurality of horizontal light sources 6 arranged side by side on the outer periphery of the bottomed water tank 2. The plurality of horizontal light sources 6 are a specific example of the plurality of second light sources. The plurality of horizontal light sources 6 are arranged along the peripheral wall 2b of the bottomed water tank 2. The plurality of horizontal light sources 6 are arranged at predetermined intervals along the peripheral wall 2b of the bottomed water tank 2 in a plan view. The plurality of horizontal light sources 6 are arranged side by side in the vertical direction along the peripheral wall 2b of the bottomed water tank 2 in a side view shown in FIG. 5. In the present embodiment, three horizontal light sources 6 are arranged side by side in the vertical direction. Among the three horizontal light sources 6, the upper horizontal light source 6 irradiates visible light toward the landing tool 3 by setting the irradiation direction of the visible light to be slightly downward. The middle horizontal light source 6 irradiates visible light toward the landing tool 3 by setting the irradiation direction of the visible light to be horizontal. The lower horizontal light source 6 irradiates visible light toward the landing tool 3 by setting the irradiation direction of the visible light to be slightly upward.

[0055] FIG. 6 shows a block diagram of the culturing device 1 of the present embodiment. As shown in FIGS. 5 and 6, the swimming control unit 22 controls the swimming of the swimmer Q so that the swimmer Q swims toward the landing tool 3 based on the three-dimensional distribution of the swimmer Q calculated by the distribution calculation unit 21. In the present embodiment, the moving device 8 and the head shaking device 9 are omitted. Specifically, it is as follows.

[0056] First, as shown in FIG. 5, the swimming control unit 22 calculates a density coordinate R where the swimmers Q are most densely concentrated based on the three-dimensional distribution of the swimmers Q. Next, the swimming control unit 22 selectively turns on any one of the plurality of horizontal light sources 6 to control the swimming of the swimmers Q concentrated at the density coordinate R so that they swim toward the landing tool 3.

[0057] Here, due to the negative phototaxis of the zoospore Q, the zoospore Q swims away from the horizontal light source 6. Therefore, the swimming control unit 22 selects any one of the plurality of horizontal light sources 6 such that the selected horizontal light source 6 is located on the opposite side of the implantation tool 3 across the dense coordinate R and the horizontal light source 6, the dense coordinate R, and the implantation tool 3 are aligned in a straight line. As a result, more zoospores Q will swim toward the implantation tool 3, so that the zoospores Q can be efficiently implanted on the implantation tool 3.

[0058] Next, with reference to FIG. 7, a method of implantation using the implantation device 1 will be described.

[0059] The implantation method of this embodiment is different from the implantation method of the first embodiment in steps S160 and S220.

[0060] In step S160 of this embodiment, the swimming control unit 22 of the implantation control device 10 controls the swimming of the zoospore Q based on the three-dimensional distribution of the zoospore Q calculated by the distribution calculation unit 21 so that the zoospore Q swims toward the implantation tool 3. Specifically, the swimming control unit 22 of the implantation control device 10 selects any one of the plurality of horizontal light sources 6 such that the selected horizontal light source 6, the dense coordinate R, and the implantation tool 3 are aligned in a straight line (S170). Next, the swimming control unit 22 of the implantation control device 10 turns on the selected horizontal light source 6 (S190). As a result, the horizontal light source 6 irradiates visible light from the side toward the zoospore Q released from the mother alga P. In response to this, the zoospore Q released from the mother alga P starts to swim toward the implantation tool 3.

[0061] In step S220 of this embodiment, the swimming control unit 22 of the implantation control device 10 controls the swimming of the zoospore Q based on the three-dimensional distribution of the zoospore Q calculated by the distribution calculation unit 21 so that the zoospore Q swims toward the implantation tool 3. Specifically, the swimming control unit 22 of the implantation control device 10 selects any one of the plurality of horizontal light sources 6 such that the selected horizontal light source 6, the dense coordinate R, and the implantation tool 3 are aligned in a straight line (S230).

[0062] The second embodiment of the present disclosure has been described above. The second embodiment has the following features.

[0063] The attachment device 1 further includes a plurality of horizontal light sources 6 (at least one second light source) arranged side by side on the outer periphery of the bottomed water tank 2. The swimming control unit 22 controls the swimming of the swimmer Q so that the swimmer Q concentrated at the concentration coordinates R swims toward the landing tool 3 by selecting the horizontal light source 6 to be used for irradiation among the plurality of horizontal light sources 6. According to the above configuration, due to the negative phototaxis of the swimmer Q, the swimming of the swimmer Q concentrated at the concentration coordinates R can be controlled so as to swim toward the landing tool 3.

[0064] In the above example, the program can be stored using various types of non-transitory computer readable media and supplied to the computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer readable media include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical disks). Examples of non-transitory computer readable media further include CD-ROM (Read Only Memory), CD-R, CD-R / W, semiconductor memories (e.g., including mask ROM). Examples of non-transitory computer readable media further include PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory). Also, the program may be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer readable media can supply the program to the computer via wired communication paths such as electric wires and optical fibers, or wireless communication paths.

Explanation of Reference Numerals

[0065] 1 Attachment device 2 Bottomed water tank 2a Bottom plate 2b Peripheral wall 3 Attachment tool 4 Mother alga holder 5 Vertical light source 6 Horizontal light source 7 Luminance detector 8 Moving device 9 Oscillation device 10 Attachment control device 10a Processor 10b Memory 20 Luminance detection result acquisition unit 21 Distribution calculation unit 22 Swimming control unit K Seawater P Mother alga Q Zoospore R Aggregation coordinates

Claims

1. A bottomed water tank, A landing tool on which zoospores released from the mother alga can settle, A first light source capable of irradiating light downward toward the zoospores, comprising A settlement system.

2. The settlement system according to Claim 1, A plurality of luminance detectors arranged above the bottomed water tank and capable of detecting the luminance distribution of the first light source, Distribution calculation means for calculating the three-dimensional distribution of the zoospores based on the luminance detection results of the plurality of luminance detectors, At least one second light source provided on the outer periphery of the bottomed water tank, Swimming control means for controlling the swimming of the zoospores so that the zoospores swim toward the landing tool based on the three-dimensional distribution of the zoospores using the at least one second light source, comprising A settlement system.

3. The settlement system according to Claim 2, The swimming control means calculates the density coordinates where the zoospores are most concentrated based on the three-dimensional distribution of the zoospores, and controls the swimming of the zoospores so that the zoospores concentrated at the density coordinates swim toward the landing tool, A settlement system.

4. The settlement system according to Claim 3, The swimming control means controls the swimming of the zoospores so that the zoospores concentrated at the density coordinates swim toward the landing tool by moving the at least one second light source, A settlement system.

5. The settlement system according to Claim 3, The at least one second light source includes a plurality of second light sources, The swimming control means controls the swimming of the zoospores so that the zoospores concentrated at the density coordinates swim toward the landing tool by selecting the second light source used for irradiation from among the plurality of second light sources, A settlement system.

6. The settlement system according to any one of Claims 1 to 5, wherein the bottomed water tank has a circular bottom plate and a cylindrical peripheral wall protruding upward from the bottom plate, A settlement system.

7. The settlement system according to any one of Claims 1 to 5, wherein the landing tool is arranged at the center of the bottomed water tank in plan view, A settlement system.

8. The settlement system according to any one of Claims 1 to 5, wherein the landing tool is a twisted yarn, A settlement system.

9. A landing tool on which zoospores released from the mother alga can settle is provided in the bottomed water tank, breeding water is injected into the bottomed water tank, the mother alga is placed in the bottomed water tank, A method of attachment, which irradiates light from below toward zoospores released from the mother alga. A method of attachment.

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