Illumination device, illumination method, and illumination program

Abstract

An illumination device (10) illuminates, with light, a region to be illuminated, which is identified on the basis of the amount of phytoplankton in a water area in which a marine product (P) is cultured.

Description

Irradiation device, irradiation method, and irradiation program

[0001] The present invention relates to an irradiation device, an irradiation method, and an irradiation program.

[0002] A known technique is to install fertilizer containers in hanging-type aquaculture farms to increase the amount of phytoplankton, which is the food of oysters, and to control the leaching of fertilizer components.

[0003] JP 2011-115183 A

[0004] However, it is difficult to increase phytoplankton and promote the growth of marine products at specific aquaculture bases in waters where marine products such as shellfish are cultivated. For example, while conventional techniques can increase phytoplankton in waters that are lacking in nutrients above the phytoplankton maximum layer, it is difficult to increase phytoplankton in waters below the seabed layer above the phytoplankton maximum layer.

[0005] The present invention has been made in view of the above, and aims to promote the growth of marine products in a specific aquaculture base.

[0006] An illumination device according to one embodiment of the present invention includes an illumination unit that illuminates an illumination target area with light, the illumination target area being specified based on the amount of phytoplankton in a water area where aquatic products are cultivated.

[0007] In an illumination method according to one embodiment of the present invention, a computer executes a process of illuminating an illumination target area that is identified based on the amount of phytoplankton in a water area where aquatic products are cultivated.

[0008] An illumination program according to one embodiment of the present invention causes a computer to execute a process of illuminating an illumination target area that is identified based on the amount of phytoplankton in a water area where aquatic products are cultivated.

[0009] According to the present invention, it is possible to promote the growth of marine products at a specific aquaculture base.

[0010] 1 is a diagram illustrating an example of a configuration and an example of a processing of an aquaculture system according to an embodiment; FIG. 2 is a block diagram illustrating an example of a configuration of each device of the aquaculture system according to an embodiment; FIG. 3 is a diagram illustrating an example of a measurement data storage unit of an irradiation device according to an embodiment; FIG. 4 is a diagram illustrating an example of a specific result storage unit of an irradiation device according to an embodiment; FIG. 5 is a diagram illustrating an example of an irradiation result storage unit of an irradiation device according to an embodiment; FIG. 6 is a diagram illustrating an example of a supply data storage unit of an irradiation device according to an embodiment; FIG. 7 is a diagram illustrating a specific example of a distribution of chlorophyll concentration according to an embodiment; FIG. 8 is a diagram illustrating a specific example 1 of a light guide path according to an embodiment; FIG. 9 is a diagram illustrating a specific example 2 of a light guide path according to an embodiment; FIG. 10 is a diagram illustrating a specific example 1 of an irradiation method according to an embodiment; FIG. 11 is a diagram illustrating a specific example 2 of an irradiation method according to an embodiment; FIG. 12 is a diagram illustrating a specific example 3 of an irradiation method according to an embodiment; FIG. 13 is a diagram illustrating a specific example 4 of an irradiation method according to an embodiment; FIG. 14 is a diagram illustrating a specific example 5 of an irradiation method according to an embodiment; FIG. 15 is a diagram illustrating a specific example 6 of an irradiation method according to an embodiment;

[0011] An irradiation device, an irradiation method, and an irradiation program according to an embodiment of the present invention will be described in detail below with reference to the drawings. Note that the present invention is not limited to the embodiment described below.

[0012] The following describes the configuration and processing of the aquaculture system 100 according to the embodiment, the configuration and processing of each device of the aquaculture system 100, the processing flow of the aquaculture system 100, and the effects of the embodiment.

[0013] 1. Configuration and Processing of the Aquaculture System 100 The configuration and processing of the aquaculture system 100 according to an embodiment will be described with reference to Figure 1. Figure 1 is a diagram showing an example of the configuration and processing of the aquaculture system 100 according to an embodiment. Below, an example of the overall configuration of the aquaculture system 100, an example of the processing of the aquaculture system 100, and the effects of the aquaculture system 100 will be described.

[0014] In the embodiments, the farming of shellfish (e.g., oysters, scallops, and pearl oysters) in a suspended farm is described as an example, but there are no particular limitations on the farming method or type of marine product P. In addition, in the embodiments, the farming in seawater is described as an example, but the farming in waters such as freshwater and brackish waters is also acceptable.

[0015] (1-1. Example of overall configuration of aquaculture system 100) The aquaculture system 100 has an irradiation device 10, a measurement device 20, and a supply device 30. The irradiation device 10, the measurement device 20, and the supply device 30 are connected to each other via a predetermined communication network (not shown) so as to be able to communicate with each other by wire or wirelessly. The predetermined communication network may be any of various communication networks such as the Internet or a dedicated line.

[0016] (1-1-1. Illumination Device 10) The illumination device 10 is a device that irradiates light onto a specific aquaculture base in a water area where aquatic products P are cultivated. For example, the illumination device 10 has a light source L that can irradiate light with a wavelength required for photosynthesis of phytoplankton. Note that the aquatic product cultivation system 100 shown in FIG. 1 may include multiple illumination devices 10. Furthermore, the illumination device 10 may have multiple light sources L.

[0017] Here, the aquaculture base is a specified location included in the water area where the marine product P is cultivated, such as a certain area around a rope to which the marine product P is attached that is suspended in the water area within the aquaculture farm, or a cage that isolates the marine product P installed in the water area within the aquaculture farm.

[0018] (1-1-2. Measuring Device 20) The measuring device 20 is a device that measures the amount of phytoplankton in the water area where the aquatic product P is cultivated. For example, the measuring device 20 has a sensor S that detects chlorophyll of the phytoplankton. The measuring device 20 also controls the sensor S to move up and down vertically in the seawater area using a reel. Note that the aquatic product cultivation system 100 shown in FIG. 1 may include multiple measuring devices 20. The measuring device 20 may also have multiple sensors S.

[0019] (1-1-3. Supplying Device 30) The supplying device 30 is a device that supplies nutrients to the water area where the aquatic product P is cultivated. For example, the supplying device 30 has a storage container F that stores nutrients that increase phytoplankton. The supplying device 30 also controls the storage container F by a reel so that it can move up and down in the vertical direction of the seawater area. The aquatic product cultivation system 100 shown in FIG. 1 may include multiple supplying devices 30. The supplying device 30 may also have multiple storage containers F.

[0020] (1-2. Example of processing of the entire aquaculture system 100) The processing of the entire aquaculture system 100 as described above will be described. Note that the processing shown in (1) to (4) in Fig. 1 below may be executed in a different order. Furthermore, some of the processing shown in (1) to (4) in Fig. 1 below may be omitted.

[0021] (1-2-1. Measurement Management Process) First, the measurement device 20 measures the chlorophyll concentration, which indicates the amount of phytoplankton (see FIG. 1(1)). For example, the measurement device 20 measures the chlorophyll concentration in the vertical direction of the aquaculture site at each fixed depth using a sensor S that moves up and down vertically in the seawater area using a reel. In addition, the irradiation device 10 acquires the vertical distribution of chlorophyll concentration, which includes the multiple chlorophyll concentrations measured vertically by the measurement device 20.

[0022] (1-2-2. Identification Management Process) Second, the illumination device 10 identifies the illumination target area (see FIG. 1(2)). For example, the illumination device 10 identifies a seawater area where the chlorophyll concentration shows a maximum value using the vertical distribution of chlorophyll concentration, identifies seawater areas at a certain depth above and below the maximum value as maximum layers, and identifies an aquaculture base containing marine products P at a certain depth on the seabed side of the maximum layer as the illumination target area.

[0023] That is, the irradiation device 10 identifies, as the irradiation target area, an aquaculture base where the amount of sunlight irradiation is small and the amount of phytoplankton necessary for the growth of the marine product P is small.

[0024] (1-2-3. Irradiation Management Process) Third, the illumination device 10 illuminates the illumination target area with light (see FIG. 1(3)). For example, the illumination device 10 illuminates the aquaculture bases for the marine products P-2 and P-3 located on the seabed side of the maximum layer with light via a light source L that moves up and down vertically in the seawater area using a reel.

[0025] In this case, the illumination device 10 may illuminate the plurality of aquaculture bases with light via the plurality of light sources L. For example, in a case where there are a plurality of light sources L (L-1, L-2), the illumination device 10 may illuminate the aquaculture base for the marine product P-2 with light via the light source L-1, and illuminate the aquaculture base for the marine product P-3 with light via the light source L-2.

[0026] The illumination device 10 may also irradiate the aquaculture base with light via a light guide path G (not shown) that guides light generated by the light source L. For example, the illumination device 10 may guide light generated by the light source L on the sea surface and irradiate the aquaculture base for the marine products P-2 and P-3 with light via a light guide tube G-P that scatters the light at a slit portion. The illumination device 10 may also guide light generated by the light source L on the sea surface and irradiate the light at the aquaculture base for the marine products P-2 and P-3 with light via an optical fiber G-F that irradiates light at a tip portion.

[0027] The irradiation device 10 may also irradiate the aquaculture base with light via a concentrator C (not shown) that concentrates sunlight and the above-mentioned light guide path G. For example, the irradiation device 10 may guide the light concentrated from the concentrator C on the sea surface and irradiate the light to the aquaculture base for the marine products P-2 and P-3 via a light guide tube G-P that scatters the light at a slit portion. The irradiation device 10 may also guide the light concentrated from the concentrator C on the sea surface and irradiate the light to the aquaculture base for the marine products P-2 and P-3 via an optical fiber G-F that irradiates the light at its tip portion.

[0028] (1-2-4. Supply Management Process) Fourth, the supply device 30 supplies the nutrient components (see FIG. 1(4)). For example, the supply device 30 supplies the nutrient components to the aquaculture base of the marine product P-0 located on the surface side of the maximum layer via a storage container F that moves up and down vertically in the seawater area using a reel.

[0029] That is, the supply device 30 supplies nutrients to a farming base that is exposed to a lot of sunlight but has a low amount of nutrients.

[0030] (1-3. Effects of the aquaculture system 100) Below, the problems of the aquaculture system 100P according to the reference technology will be explained, and then the effects of the aquaculture system 100 will be explained.

[0031] (1-3-1. Background of the seafood cultivation system 100P) The seafood cultivation system 100P according to the reference technology is a technology for cultivating oysters as seafood P. Here, in the seafood cultivation system 100P, scallop shells with seed oysters attached are tied to ropes, and the oysters are suspended in water to grow. Also, in the seafood cultivation system 100P, the oysters are fed with phytoplankton. Also, in the seafood cultivation system 100P, nutrients, which are one of the growth factors for phytoplankton, are lowest in the surface layer and increase as the water depth increases. Also, in the seafood cultivation system 100P, light intensity, which is another growth factor, is highest in the surface layer and decreases as the water depth increases.

[0032] (1-3-2. Problems with the aquaculture system 100P) The aquaculture system 100P proposes a method of installing fertilizer containers containing fertilizer in a hanging aquaculture facility and controlling the elution of fertilizer components in order to increase the amount of phytoplankton, which is food for oysters. However, while the aquaculture system 100P can increase phytoplankton in water areas that are deficient in nutrients above the surface layer of the phytoplankton maximum layer, it cannot increase phytoplankton in water areas below the seabed layer, resulting in a problem of a lack of food for oysters.

[0033] (1-3-3. Overview of the Seafood Cultivation System 100) The seafood cultivating system 100 performs the following processes. First, the measuring device 20 measures the chlorophyll concentration in the vertical direction of the aquaculture area at each fixed depth using a sensor S that moves up and down vertically in the seawater area on a reel. Second, the illumination device 10 identifies the seawater area where the chlorophyll concentration shows a maximum value using the vertical distribution of the chlorophyll concentration measured by the measuring device 20, identifies seawater areas at a certain depth above and below the maximum value as maximum layers, and identifies the aquaculture base including the seafood P at a certain depth on the seabed side of the maximum layer as the illumination target area. Third, the illumination device 10 illuminates the seawater area including the aquaculture base for the seafood P on the seabed side of the maximum layer with light via a light source L that moves up and down vertically in the seawater area on a reel, a light collector C, and a light guide G. Fourth, the supply device 30 supplies nutrients to the seawater area including the aquaculture base for the marine products P on the surface side of the maximum layer via a storage container F that moves up and down vertically in the seawater area using a reel.

[0034] (1-3-4. Effects of the Seafood Cultivation System 100) The seafood cultivation system 100 has the following effects. First, the seafood cultivation system 100 can increase the amount of phytoplankton and promote the growth of the seafood P by irradiating light to a seawater area, including an aquaculture base, where the amount of sunlight irradiation is low and the amount of phytoplankton is small. Second, the seafood cultivation system 100 can further increase the amount of phytoplankton and promote the growth of the seafood P by supplying nutrients to a seawater area, including an aquaculture base, where the amount of sunlight irradiation is high and the amount of phytoplankton is large but the amount of nutrients is small. Third, the seafood cultivation system 100 can efficiently promote the growth of the seafood P by allowing selection of various irradiation methods that utilize the light source L, the light collector C, and the light guide G.

[0035] As described above, the aquaculture system 100 can promote the growth of aquatic products P at a specific aquaculture base.

[0036] 2. Configuration and processing of each device of the aquaculture system 100 The configuration and processing of each device included in the aquaculture system 100 shown in Fig. 1 will be described using Fig. 2. Fig. 2 is a block diagram showing an example configuration of each device of the aquaculture system 100 according to an embodiment. Below, an example configuration of the entire aquaculture system 100 according to an embodiment, an example configuration and processing of the irradiation device 10, a specific example irradiation method of the irradiation device 10, an example configuration and processing of the measurement device 20, and an example configuration and processing of the supply device 30 will be described.

[0037] (2-1. Example of overall configuration of aquaculture system 100) An example of the overall configuration of the aquaculture system 100 shown in FIG. 1 will be described using FIG. 2. As shown in FIG. 2, the aquaculture system 100 has an irradiation device 10, a measurement device 20, and a supply device 30. The irradiation device 10, the measurement device 20, and the supply device 30 are communicatively connected via a communication network N realized by the Internet, a dedicated line, or the like.

[0038] The irradiation device 10 is installed above the water surface in the water area of ​​the aquaculture farm, except for the light source L, which can be installed below the water surface. The measurement device 20 is installed above the water surface in the water area of ​​the aquaculture farm, except for the sensor S, which can be installed below the water surface. The supply device 30 is installed above the water surface in the water area of ​​the aquaculture farm, except for the storage container F, which can be installed below the water surface.

[0039] (2-2. Configuration example and processing example of irradiation device 10) A configuration example and processing example of the irradiation device 10 will be described with reference to Fig. 2. The irradiation device 10 has an input unit 11, an output unit 12, a communication unit 13, a storage unit 14, a control unit 15, a light source L, a light guide path G, and a condenser C.

[0040] (2-2-1. Input Unit 11) The input unit 11 controls input of various information to the irradiation device 10. For example, the input unit 11 is realized by a mouse, a keyboard, etc., and accepts input of various information to the irradiation device 10.

[0041] (2-2-2. Output Unit 12) The output unit 12 controls the output of various information from the irradiation device 10. For example, the output unit 12 is realized by a display or the like, and displays various information stored in the irradiation device 10.

[0042] (2-2-3. Communication Unit 13) The communication unit 13 controls data communication with other devices. For example, the communication unit 13 performs data communication with each communication device via a router or the like. The communication unit 13 can also perform data communication with a terminal or the like (not shown).

[0043] (2-2-4. Storage unit 14) The storage unit 14 stores various information referenced when the control unit 15 operates and various information acquired when the control unit 15 operates. The storage unit 14 has a measurement data storage unit 14a, a specific result storage unit 14b, an irradiation result storage unit 14c, and a supply data storage unit 14d. Here, the storage unit 14 can be realized by, for example, a semiconductor memory element such as RAM (Random Access Memory) or flash memory, or a storage device such as a hard disk or optical disk. In the example of FIG. 2, the storage unit 14 is installed inside the irradiation device 10, but it may be installed outside the irradiation device 10, or multiple storage units may be installed.

[0044] (2-2-4-1. Measurement data storage unit 14a) The measurement data storage unit 14a stores measurement data. For example, the measurement data storage unit 14a stores the chlorophyll concentration of the water area where the marine product P is cultivated, which is measured by the measurement device 20 and acquired by an acquisition unit 15a of the control unit 15 described below. Here, an example of data stored in the measurement data storage unit 14a will be described with reference to FIG. 3. FIG. 3 is a diagram showing an example of the measurement data storage unit 14a of the irradiation device 10 according to the embodiment. In the example of FIG. 3, the measurement data storage unit 14a has items such as "measurement device," "measurement target area," "measurement position," and "measurement data."

[0045] "Measuring device" indicates identification information for identifying the measuring device 20, such as the identification number or identification symbol of the measuring device 20. "Measurement target area" indicates identification information for identifying the water area where the measuring device 20 is installed to cultivate the marine product P, such as the identification number or identification symbol of the aquaculture facility, aquaculture equipment, or aquaculture section. "Measurement location" indicates the location where the measuring device 20 measured the chlorophyll concentration, and is expressed, for example, by the depth indicating the vertical position of the water area, or the latitude and longitude indicating the horizontal position of the water area. "Measurement data" indicates the chlorophyll concentration measured by the measuring device 20, and is expressed, for example, in mg / L or mass percentage %.

[0046] That is, Figure 3 shows an example in which data such as {measurement location: "measurement location #1", measurement data: "measurement data #1", ...}, {measurement location: "measurement location #2", measurement data: "measurement data #2", ...}, {measurement location: "measurement location #3", measurement data: "measurement data #3", ...}, {measurement location: "measurement location #4", measurement data: "measurement data #4", ...}, ... are stored in the measurement data storage unit 14a for the measurement device 20 identified by "measurement device #1" and the water area identified by "measurement target area #1".

[0047] In addition, the measurement data storage unit 14a can also store the chlorophyll concentration of the water area where the marine product P is cultivated, which is measured by workers at the marine product P farm and input to the input unit 11.

[0048] (2-2-4-2. Identification result storage unit 14b) The identification result storage unit 14b stores the identification results. For example, the identification result storage unit 14b stores the identification results output by the identification unit 15b of the control unit 15, which will be described later. Here, an example of data stored in the identification result storage unit 14b will be described with reference to FIG. 4. FIG. 4 is a diagram showing an example of the identification result storage unit 14b of the irradiation device 10 according to the embodiment. In the example of FIG. 4, the identification result storage unit 14b has items such as "measurement device," "measurement target area," "measurement position," "irradiation target," "irradiation method," and "supply target."

[0049] "Measuring device" indicates identification information for identifying the measuring device 20, such as the identification number or identification symbol of the measuring device 20. "Measurement target area" indicates identification information for identifying the water area where the measuring device 20 is installed to cultivate the marine product P, such as the identification number or identification symbol of the aquaculture facility, aquaculture equipment, or aquaculture section. "Measurement position" indicates the location where the measuring device 20 measured the chlorophyll concentration, and is expressed, for example, by the depth indicating the vertical position of the water area, or the latitude and longitude indicating the horizontal position of the water area. "Irradiation target" indicates whether or not the water area is an irradiation target area, which is an area to which the irradiation device 10 irradiates light, and is expressed, for example, by "○" if it is an irradiation target area, "×" if it is not an irradiation target area, or "-" if it is unclear whether or not it is an irradiation target area. "Irradiation method" indicates identification information for identifying the irradiation method, which is the method by which the irradiation device 10 irradiates light, and is, for example, an identification number or identification symbol of the irradiation method defined by measurement conditions such as the type of irradiated light, the irradiation range, and the usage of the light source L, the light guide G, and the condenser C. Note that "irradiation method" is represented by, for example, "-" if irradiation is not required or the irradiation method is unknown. "Supply target" indicates whether or not the area is a supply target area, which is a water body to which the supply device 30 supplies nutrients, and is represented by, for example, "○" if it is a supply target area, "×" if it is not a supply target area, and "-" if it is unknown whether or not it is a supply target area.

[0050] That is, Figure 4 shows an example in which the following data is stored in the identification result storage unit 14b for the measurement device 20 identified by "measurement device #1" and the water area identified by "measurement target area #1", such as {measurement location: "measurement location #1", irradiation target: "x", irradiation method: "-", supply target: "○", ...}, {measurement location: "measurement location #2", irradiation target: "-", irradiation method: "-", supply target: "-", ...}, {measurement location: "measurement location #3", irradiation target: "○", irradiation method: "irradiation method A", supply target: "x", ...}, {measurement location: "measurement location #4", irradiation target: "○", irradiation method: "irradiation method A", supply target: "×", ...}, ...

[0051] (2-2-4-3. Irradiation result storage unit 14c) The irradiation result storage unit 14c stores irradiation results. For example, the irradiation result storage unit 14c stores irradiation results indicating the history of irradiation by the irradiation unit 15c of the control unit 15, which will be described later. Here, an example of data stored in the irradiation result storage unit 14c will be described with reference to FIG. 5. FIG. 5 is a diagram showing an example of the irradiation result storage unit 14c of the irradiation device 10 according to the embodiment. In the example of FIG. 5, the irradiation result storage unit 14c has items such as "irradiation device," "irradiation position," "irradiation method," and "irradiation time."

[0052] The "illumination device" indicates identification information for identifying the illumination device 10, such as an identification number or symbol of the illumination device 10. The "illumination position" indicates the position where the illumination device 10 illuminates light, such as a depth indicating the vertical position of the water body, or a latitude and longitude indicating the horizontal position of the water body. The "illumination method" indicates identification information for identifying the illumination method by which the illumination device 10 illuminates light, such as an identification number or symbol of the illumination method defined by illumination conditions such as the type of illumination light, illumination intensity, illumination range, and the usage mode of the light source L, light guide G, and condenser C. Note that the "illumination method" is represented by, for example, "-" when there is no illumination or when the illumination method is unknown. The "illumination time" indicates the time the illumination device 10 illuminates light, such as the total time for which light is illuminated, the start time of illumination, and the end time of illumination. Note that the "illumination time" is represented by, for example, "-" when there is no illumination or the illumination time is unknown.

[0053] Figure 5 shows an example in which data such as {Irradiation position: "Irradiation position #1", irradiation method: "-", irradiation time: "-", ...}, {Irradiation position: "Irradiation position #2", irradiation method: "-", irradiation time: "-", ...}, {Irradiation position: "Irradiation position #3", irradiation method: "Irradiation method A", irradiation time: "Irradiation time T", ...}, {Irradiation position: "Irradiation position #4", irradiation method: "Irradiation method A", irradiation time: "Irradiation time T", ...}, ... is stored in the irradiation result memory unit 14c for the irradiation device 10 identified by "irradiation device #1" and the water area identified by "irradiation target area #1".

[0054] (2-2-4-4. Supply data storage unit 14d) The supply data storage unit 14d stores supply data. For example, the supply data storage unit 14d stores supply data indicating the balance history of nutritional components stored in the storage container F of the supply device 30, acquired by the acquisition unit 15a of the control unit 15 described below. Here, an example of data stored in the supply data storage unit 14d will be described with reference to FIG. 6. FIG. 6 is a diagram showing an example of the supply data storage unit 14d of the irradiation device 10 according to the embodiment. In the example of FIG. 6, the supply data storage unit 14d has items such as "supply device," "supply target area," "time," "supply amount," and "replenishment amount."

[0055] "Supply device" indicates identification information for identifying the supply device 30, such as an identification number or identification symbol of the supply device 30. "Supply target area" indicates identification information for identifying the water area where the supply device 30 is installed to cultivate the aquatic product P, such as an identification number or identification symbol of the aquaculture facility, aquaculture equipment, or aquaculture section. "Time" indicates the time when the nutrient components were supplied from the storage container F of the supply device 30 or the time when the nutrient components were replenished to the storage container F of the supply device 30, and is expressed, for example, in years, months, days, hours, minutes, and seconds. "Supply amount" indicates the amount of nutrient components supplied by the supply device 30 via the storage container F, and is expressed, for example, in grams of fertilizer containing the nutrient components. Note that "supply amount" is expressed, for example, as "-" when there is no supply or when the amount supplied is unknown. "Replenishment amount" indicates the amount of nutrient components replenished to the storage container F, and is expressed, for example, in grams of fertilizer containing the nutrient components. It should be noted that the "amount of replenishment" is expressed as, for example, "-" if there is no replenishment or if the amount of replenishment is unknown.

[0056] Figure 6 shows an example in which data such as {time: "Time #1", supply amount: "Supply amount X-1", replenishment amount: "-", ...}, {time: "Time #2", supply amount: "Supply amount X-2", replenishment amount: "-", ...}, {time: "Time #3", supply amount: "-", replenishment amount: "Replenishment amount Y", ...}, ... is stored in the supply data storage unit 14d for the supply device 30 identified by "Supply device #1" and the water area identified by "Supply target area #1".

[0057] (2-2-5. Control Unit 15) The control unit 15 is responsible for overall control of the irradiation device 10. The control unit 15 has an acquisition unit 15a, an identification unit 15b, an irradiation unit 15c, and an instruction unit 15d. Here, the control unit 15 can be realized by, for example, an electronic circuit such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit), or an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0058] (2-2-5-1. Acquisition unit 15a) The acquisition unit 15a acquires various types of information. The acquisition unit 15a may store the acquired various types of information in the storage unit 14. The measurement data acquisition control process and the supply data acquisition control process will be described below.

[0059] (Measurement Data Acquisition Control Process) The acquisition unit 15a executes the measurement data acquisition control process. The acquisition unit 15a acquires, as measurement data, the chlorophyll concentration of the water area where the marine product P is cultivated. Here, the marine product P is, for example, shellfish cultivated in a suspended aquaculture farm. For example, the acquisition unit 15a acquires a chlorophyll concentration distribution indicating the amount of phytoplankton in the vertical direction of the water area where the marine product P is cultivated. In this case, the acquisition unit 15a acquires the chlorophyll concentration distribution in the vertical direction of the water area where the marine product P is cultivated, measured by the measurement device 20. The acquisition unit 15a can also acquire the chlorophyll concentration distribution in the vertical direction of the water area where the marine product P is cultivated, measured by an operator at the marine product P farm and input to the input unit 11. The acquisition unit 15a can also acquire the chlorophyll concentration distribution in the horizontal direction of the water area where the marine product P is cultivated.

[0060] To explain a specific example of the measurement data acquisition control process, the acquisition unit 15a acquires the following measurement data measured by the "measurement device #1", which is a measurement device 20 installed in the "measurement target area #1", which is a seawater area: {measurement location: "measurement location #1", measurement data: "measurement data #1", ...}, {measurement location: "measurement location #2", measurement data: "measurement data #2", ...}, {measurement location: "measurement location #3", measurement data: "measurement data #3", ...}, {measurement location: "measurement location #4", measurement data: "measurement data #4", ...}, ..., and stores them in the measurement data storage unit 14a.

[0061] (Supply Data Acquisition Control Process) The acquisition unit 15a executes a supply data acquisition control process. The acquisition unit 15a acquires, as supply data, a balance history of the nutritional components stored in the storage container F of the supply device 30. For example, the acquisition unit 15a acquires the supply amount of the nutritional components supplied. At this time, the acquisition unit 15a acquires the supply amount of the nutritional components supplied by the supply device 30. The acquisition unit 15a can also acquire the supply amount of the nutritional components supplied by workers at the farm of the marine product P and input to the input unit 11. On the other hand, the acquisition unit 15a acquires the replenishment amount of the nutritional components replenished to the storage container F. At this time, the acquisition unit 15a acquires the replenishment amount of the nutritional components replenished by the supply device 30. The acquisition unit 15a can also acquire the replenishment amount of the nutritional components replenished by workers at the farm of the marine product P and input to the input unit 11.

[0062] To explain a specific example of the supply data acquisition control process, the acquisition unit 15a acquires the following supply data indicating the balance history of nutrients supplied or replenished by ``supply device #1'', which is a supply device 30 installed in ``supply target area #1'', which is a seawater area: {time: ``Time #1'', supply amount: ``supply amount X-1'', replenishment amount: ``-'', ...}, {time: ``Time #2'', supply amount: ``supply amount X-2'', replenishment amount: ``-'', ...}, {time: ``Time #3'', supply amount: ``-'', replenishment amount: ``replenishment amount Y'', ...}, ..., and stores it in the supply data storage unit 14d.

[0063] (2-2-5-2. Identification unit 15b) The identification unit 15b outputs the identification result. The identification unit 15b may store the output identification result in the storage unit 14. The identification unit 15b may also refer to various information stored in the storage unit 14. Below, specific examples of the irradiation target area identification control process, the irradiation method identification control process, the supply target area identification control process, and the distribution of chlorophyll concentration will be described.

[0064] (Illumination target area identification control process) The identification unit 15b executes the illumination target area identification control process. The identification unit 15b identifies the illumination target area to be irradiated with light based on the chlorophyll concentration of the water area where the marine product P is cultivated. For example, the identification unit 15b uses the chlorophyll concentration distribution, which indicates the amount of phytoplankton in the vertical direction of the water area acquired by the acquisition unit 15a, to identify, as the illumination target area, the water area including the aquaculture base vertically below the water area where the chlorophyll concentration shows a maximum value.

[0065] To explain a specific example of the irradiation target area identification control process, the identification unit 15b refers to the measurement data stored in the measurement data storage unit 14a, which is measured by the measurement device 20 ``measurement device #1'' installed in the ``measurement target area #1'', which is a seawater area, such as {measurement position: ``measurement position #1'', measurement data: ``measurement data #1'', ...}, {measurement position: ``measurement position #2'', measurement data: ``measurement data #2'', ...}, {measurement position: ``measurement position #3'', measurement data: ``measurement data #3'', ...}, {measurement position: ``measurement position #4'', measurement data: ``measurement data #4'', ...}, ..., and identifies that the depth of ``measurement position #2'' is a seawater area where the maximum value of chlorophyll concentration is included. Furthermore, the identification unit 15b identifies a certain range around the rope to which the marine product P is attached, at the depths of "measurement position #3" and "measurement position #4", which are deeper than "measurement position #2", as the irradiation target area, and stores the identification results {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #3", irradiation target: "○"} and {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #4", irradiation target: "○"} in the identification result memory unit 14b.

[0066] (Irradiation Method Identification Control Process) The specification unit 15b executes an irradiation method identification control process. The specification unit 15b specifies an irradiation method, which is a method of irradiating light by the irradiation device 10. For example, the specification unit 15b specifies an irradiation method defined by the type of irradiation light, irradiation intensity, irradiation range, irradiation time period, usage modes of the light source L, the light guide path G, and the condenser C, etc.

[0067] To explain a specific example of the irradiation method identification control process, the identification unit 15b refers to {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #3", irradiation target: "○"} and {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #4", irradiation target: "○"} as the identification result of the irradiation target area, identifies an irradiation method defined by irradiation conditions such as the type of irradiation light, irradiation intensity, irradiation range, and usage mode of the light source L, light guide G, and condenser C, and stores {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #3", irradiation method: "irradiation method A"} and {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #4", irradiation method: "irradiation method A"} as the identification result storage unit 14b.

[0068] At this time, the specifying unit 15b can specify an irradiation method including irradiation conditions according to the irradiation target area. For example, the specifying unit 15b can specify an irradiation method including the type of irradiation light, irradiation intensity, irradiation range, etc. according to the depth and distance of the irradiation target area. Furthermore, the specifying unit 15b can specify an irradiation method including the usage modes of the light source L, the light guide G, and the condenser C, etc. according to the depth and distance of the irradiation target area.

[0069] Furthermore, the specifying unit 15b can specify an irradiation method including irradiation conditions according to the irradiation time period. For example, when the time period for irradiating light is nighttime, the specifying unit 15b can specify an irradiation method including the use of only the light source L. When the time period for irradiating light is daytime, the specifying unit 15b can specify an irradiation method including the use of the concentrator C that concentrates sunlight and the light guide G. Similarly, the specifying unit 15b can specify an irradiation method including irradiation conditions according to the facilities, season, weather, etc. of the aquaculture farm.

[0070] (Supply target area identification control process) The identification unit 15b executes the supply target area identification control process. The identification unit 15b identifies a supply target area to which nutrients are to be supplied based on the chlorophyll concentration of the water area where the marine product P is cultivated. For example, the identification unit 15b uses the vertical chlorophyll concentration distribution of the water area acquired by the acquisition unit 15a to identify, as the supply target area, a water area that includes an aquaculture base vertically above the water area where the chlorophyll concentration shows a maximum value.

[0071] To explain a specific example of the supply target area identification control process, the identification unit 15b refers to the measurement data stored in the measurement data storage unit 14a, which is measured by the measurement device 20 ``measurement device #1'' installed in the ``measurement target area #1'', which is a seawater area, such as {measurement location: ``measurement location #1'', measurement data: ``measurement data #1'', ...}, {measurement location: ``measurement location #2'', measurement data: ``measurement data #2'', ...}, {measurement location: ``measurement location #3'', measurement data: ``measurement data #3'', ...}, {measurement location: ``measurement location #4'', measurement data: ``measurement data #4'', ...}, ..., and identifies that the depth of ``measurement location #2'' is a seawater area where the maximum value of chlorophyll concentration is included. In addition, the identification unit 15b identifies a certain range around the rope to which the seafood P is attached, at a depth of "measurement position #1" which is smaller than the depth of "measurement position #2", as the supply target area, and stores the identification result {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #1", supply target: "○"} in the identification result memory unit 14b.

[0072] (Specific examples of chlorophyll concentration distribution) Here, specific examples of chlorophyll concentration distribution referenced in the irradiation target area identification control process and the supply target area identification control process will be described with reference to Fig. 7. Fig. 7 is a diagram showing specific examples of chlorophyll concentration distribution according to the embodiment. Below, as specific examples of chlorophyll concentration distribution in the vertical direction, the surface layer pigment concentration, maximum pigment concentration depth, vertical gradient, maximum layer pigment concentration, maximum layer standard deviation, irradiation target area, and supply target area will be described.

[0073] (Surface pigment concentration C ０ ) "C" in Figure 7 ０" is the surface pigment concentration, which indicates the concentration of chlorophyll pigment in the water area at the surface of the water. The horizontal axis "C" of the graph shown in Figure 7 indicates the concentration of chlorophyll pigment at each depth.

[0074] (Maximum dye concentration depth Z ｍ ) "Z" in Figure 7 ｍ " is the maximum pigment concentration depth, which indicates the depth at which the concentration of chlorophyll pigment in the water body is at its maximum. Note that the vertical axis "Z" of the graph shown in Figure 7 indicates the depth of the water body.

[0075] (Vertical gradient S ０ ) "S" in Figure 7 ０ " is a vertical gradient, which indicates the rate of decrease in the concentration of chlorophyll pigment with depth in a body of water.

[0076] (Maximum Layer Pigment Concentration h) "h" in FIG. 7 is the maximum layer pigment concentration, which indicates the concentration of chlorophyll pigment at the maximum pigment concentration depth.

[0077] (Maximum Layer Standard Deviation σ) "σ" in FIG. 7 is the maximum layer standard deviation, and indicates the depth range of the maximum layer in the water area.

[0078] (Irradiation Target Region) In the example of FIG. 7, the specifying unit 15b, for example, in the distribution of chlorophyll concentration in the vertical direction, ｍ The depth range of 4σ, which is ±2σ, is specified as the maximum layer. ｍ Water areas that are deeper than +2σ and that include aquaculture bases are identified as areas to be irradiated.

[0079] (Supply Target Region) In the example of FIG. 7, the specifying unit 15b, for example, determines the Z ｍ The depth range of 4σ, which is ±2σ, is specified as the maximum layer. ｍ Water areas with a depth less than -2σ and including aquaculture bases are identified as supply target areas.

[0080] (2-2-5-3. Irradiation Unit 15c) The irradiation unit 15c executes irradiation processing. The irradiation unit 15c may store irradiation results indicating the execution history of the irradiation processing in the storage unit 14. The irradiation unit 15c may also refer to various information stored in the storage unit 14. The irradiation control processing will be described below.

[0081] (Illumination Control Process) The irradiating unit 15c executes the illumination control process. For example, the irradiating unit 15c irradiates light onto an illumination target area identified based on the amount of phytoplankton in the water area where the marine product P is cultivated. The irradiating unit 15c also irradiates light onto an illumination target area identified based on the chlorophyll concentration, which indicates the amount of phytoplankton in the water area where the marine product P is cultivated. Here, the irradiating unit 15c irradiates light onto the illumination target area identified by the identifying unit 15b using the illumination method identified by the identifying unit 15b. Below, illumination methods 1 to 4 will be described as illumination control processes executed by the irradiating unit 15c.

[0082] (Illumination Method 1) As an illumination control process using illumination method 1, the illumination unit 15c uses a single light source L to illuminate a water area where aquatic products P are cultivated, including multiple aquaculture bases. Details of the illumination control process using illumination method 1 will be described later in (2-3. Specific Examples of Illumination Methods of the Illumination Device 10) and (2-3-1. Specific Example of Illumination Method 1).

[0083] To explain a specific example of the illumination control process using illumination method 1, the illumination unit 15c references {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #3", illumination target: "○"} and {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #4", illumination target: "○"} as the identification results stored in the identification result storage unit 14b. Furthermore, the illumination unit 15c illuminates a certain range around the rope to which the marine product P is attached at the depths of "measurement position #3" and "measurement position #4" identified as the illumination target area by generating light from a single light source L. At this time, the illumination unit 15c can adjust the illumination distance and illumination angle by changing the installation position of the single light source L. Furthermore, the illumination unit 15c can adjust illumination conditions, such as the type of illumination light, illumination intensity, and illumination range, by changing the settings of the single light source L.

[0084] (Illumination Method 2) As an illumination control process using illumination method 2, the illumination unit 15c uses a plurality of light sources L to illuminate each of the water areas where the marine products P are cultivated, including a plurality of aquaculture bases. Details of the illumination control process using illumination method 2 will be described later in (2-3. Specific examples of illumination methods of the illumination device 10) and (2-3-2. Specific example 2 of illumination method).

[0085] To explain a specific example of the illumination control process using illumination method 2, the illumination unit 15c references {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #3", illumination target: "○"} and {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement position: "measurement position #4", illumination target: "○"} as the identification results stored in the identification result storage unit 14b. Furthermore, the illumination unit 15c illuminates a certain range around the rope to which the marine product P is attached at the depth of "measurement position #3" identified as the illumination target area by generating light from light source L-1 of the multiple light sources L. Furthermore, the illumination unit 15c illuminates a certain range around the rope to which the marine product P is attached at the depth of "measurement position #4" identified as the illumination target area by generating light from light source L-2 of the multiple light sources L. At this time, the irradiation unit 15c can adjust the irradiation distance and irradiation angle by changing the installation positions of the plurality of light sources L. Furthermore, the irradiation unit 15c can adjust the irradiation conditions, such as the type of irradiation light, irradiation intensity, and irradiation range, by changing the setting conditions of the plurality of light sources L.

[0086] (Illumination Method 3) As an illumination control process using illumination method 3, the illumination unit 15c uses a light guide path G that guides light generated by the light source L to illuminate the water area where the marine products P are cultivated, including the aquaculture base. Details of the illumination control process using illumination method 3 will be described later in (2-3. Specific Examples of Illumination Methods of the Illumination Device 10), (2-3-3. Specific Example of Illumination Method 3), and (2-3-4. Specific Example of Illumination Method 4).

[0087] To explain a specific example of the illumination control process using illumination method 3, the illumination unit 15c references {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement location: "measurement location #3", illumination target: "○"} and {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement location: "measurement location #4", illumination target: "○"} as the identification results stored in the identification result storage unit 14b. Furthermore, the illumination unit 15c generates light from a light source L above the water surface and guides the light through a light guide path G (light guide tube G-P, optical fiber G-F) to illuminate a certain range around the rope to which the marine product P is attached at the depths of "measurement location #3" and "measurement location #4" identified as the illumination target area. At this time, the illumination unit 15c can adjust the illumination distance and illumination angle by changing the installation position of the light guide path G. Furthermore, the irradiation unit 15c can adjust the irradiation conditions such as the type of irradiation light, irradiation intensity, and irradiation range by changing the setting conditions of the light source L.

[0088] (Illumination Method 4) As an illumination control process by illumination method 4, the illumination unit 15c uses a light guide path G that guides concentrated sunlight to illuminate the water area where the marine products P are cultivated, including the aquaculture base. Details of the illumination control process by illumination method 4 will be described later in (2-3. Specific Examples of Illumination Methods of the Illumination Device 10), (2-3-5. Specific Example of Illumination Method 5), and (2-3-6. Specific Example of Illumination Method 6).

[0089] To explain a specific example of the irradiation control process using irradiation method 4, the irradiation unit 15c references {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement location: "measurement location #3", irradiation target: "○"} and {measurement device: "measurement device #1", measurement target area: "measurement target area #1", measurement location: "measurement location #4", irradiation target: "○"} as the identification results stored in the identification result storage unit 14b. Furthermore, the irradiation unit 15c irradiates a certain area around the rope to which the marine product P is attached at the depths of "measurement location #3" and "measurement location #4" identified as the irradiation target area by concentrating sunlight from a collector C above the water surface and guiding the light through a light guide G (light guide tube G-P, optical fiber G-F). At this time, the irradiation unit 15c can adjust the irradiation distance and irradiation angle by changing the installation position of the light guide G. Furthermore, the irradiation unit 15c can adjust irradiation conditions such as irradiation intensity by changing the installation position of the condenser C.

[0090] (2-2-5-4. Instructing Unit 15d) The instructing unit 15d executes various instructions. Note that the instructing unit 15d may refer to various information stored in the storage unit 14. The measurement instruction process, supply instruction process, and replenishment instruction process will be described below.

[0091] (Measurement instruction process) The instruction unit 15d executes the measurement instruction process. For example, the instruction unit 15d instructs the measurement of the chlorophyll concentration in the water area where the marine product P is cultivated. At this time, the instruction unit 15d instructs the measurement device 20 to measure the vertical distribution of chlorophyll concentration in the water area where the marine product P is cultivated. The instruction unit 15d can also instruct a worker at the marine product farm to measure the vertical distribution of chlorophyll concentration in the water area where the marine product P is cultivated.

[0092] To explain a specific example of the measurement instruction process, the instruction unit 15d transmits {measurement device: "measurement device #1", measurement target area: "measurement target area #1"} to the measurement device 20 as instruction data including the identification information of the measurement device 20 and the measurement target area, causing the measurement device 20 to measure the vertical distribution of chlorophyll concentration in the seawater area where the marine product P is cultivated. The instruction unit 15d also transmits {measurement target area: "measurement target area #1"} as instruction data including the measurement target area to an operator terminal carried by an operator at the marine product P farm, causing the operator to measure the vertical distribution of chlorophyll concentration in the seawater area where the marine product P is cultivated.

[0093] (Supply instruction process) The instruction unit 15d executes the supply instruction process. For example, the instruction unit 15d instructs the supply of nutritional components that increase phytoplankton to a supply target area identified based on the chlorophyll concentration in the water area where the marine product P is cultivated. At this time, the instruction unit 15d instructs the supply device 30 to supply the nutritional components that increase phytoplankton in the water area where the marine product P is cultivated to the supply target area. The instruction unit 15d can also instruct a worker at the marine product farm to supply the nutritional components that increase phytoplankton in the water area where the marine product P is cultivated to the supply target area.

[0094] To explain a specific example of the supply instruction process, the instruction unit 15d transmits {supply device: "supply device #1", supply target area: "supply target area #1"} to the supply device 30 as instruction data including the identification information of the supply device 30 and the supply target area, and causes the supply device 30 to supply, to the supply target area, nutritional components that increase phytoplankton in the seawater area where the marine product P is cultivated. Furthermore, the instruction unit 15d transmits {supply target area: "supply target area #1"} as instruction data including the supply target area to an operator terminal carried by an operator at the marine product P farm, and causes the operator to supply, to the supply target area, nutritional components that increase phytoplankton in the seawater area where the marine product P is cultivated.

[0095] (Replenishment instruction process) The instruction unit 15d executes a supply instruction process. For example, the instruction unit 15d instructs the supply device 30 to replenish the storage container F of the supply device 30 with a nutrient component that increases phytoplankton. At this time, the instruction unit 15d instructs the supply device 30 to replenish the storage container F of the supply device 30 with a nutrient component that increases phytoplankton in the water area where the marine product P is cultivated. The instruction unit 15d can also instruct a worker at the marine product farm to replenish the storage container F of the supply device 30 with a nutrient component that increases phytoplankton in the water area where the marine product P is cultivated.

[0096] To explain a specific example of the replenishment instruction process, the instruction unit 15d transmits {supplying device: "supplying device #1", replenishment amount: "replenishment amount Y"} to the supplying device 30 as instruction data including the identification information and replenishment amount of the supplying device 30, and causes the supplying device 30 to replenish the storage container F with nutrients that increase phytoplankton in the seawater area where the marine product P is cultivated. Furthermore, the instruction unit 15d transmits {supplying device: "supplying device #1", replenishment amount: "replenishment amount Y"} to an operator terminal carried by an operator at the marine product P farm as instruction data including the identification information and replenishment amount of the supplying device 30, and causes the operator to replenish the storage container F with nutrients that increase phytoplankton in the seawater area where the marine product P is cultivated.

[0097] (2-2-6. Light Source L) The light source L is controlled by the irradiation unit 15c and emits light. For example, the light source L is realized by an LED (Light-Emitting Diode) lamp connected to the irradiation device 10 by a reel, and emits light including light in the wavelength range of 400 nm to 700 nm, which is necessary for phytoplankton growth.

[0098] (2-2-7. Light guide path G) The light guide path G guides light incident from an incident position along the interior thereof and emits it from an emission position. For example, the light guide path G is realized by a light guide tube GP, an optical fiber GF, etc. In the following, the light guide path G will be described using the light guide tube GP and the optical fiber GF.

[0099] (2-2-7-1. Light guide tube GP) Using Fig. 8, a description will be given of the light guide tube GP as the light guide G used in the illumination control process by the above-described illumination method 3 and illumination method 4. Fig. 8 is a diagram showing a specific example 1 of the light guide path G according to the embodiment.

[0100] As shown in the example of FIG. 8 , light generated by a light source L is incident on the light guide tube G-P from an incident position. Here, sunlight concentrated by a collector C may also be incident on the light guide tube G-P from the incident position. The light guide tube G-P has a tubular structure, and a member installed or applied to the inside of the tube reflects the incident light and guides the light along the inside of the tube to the exit position. The light guide tube G-P also has a slit structure at the exit position, which scatters the light guided along the inside of the tube. As described above, the light guide tube G-P can irradiate the irradiation target area with light generated by a light source L above the water surface or sunlight concentrated by a collector C above the water surface.

[0101] (2-2-7-2. Optical fiber GF) Using Fig. 9, an optical fiber GF will be described as the light guide path G used in the irradiation control process by the above-described irradiation method 3 and irradiation method 4. Fig. 9 is a diagram showing a specific example 2 of the light guide path G according to the embodiment.

[0102] As shown in the example of Figure 9, light generated by a light source L is incident on the optical fiber G-F from an incident position. Here, sunlight concentrated by a collector C may be incident on the optical fiber G-F from an incident position. Furthermore, the optical fiber G-F has a fiber structure with multiple lengths, and guides light along the interior of each fiber structure to an exit position. Here, the optical fiber G-F may be branched by connecting multiple fiber structures with a coupler. Furthermore, the optical fiber G-F emits light guided along the interior of each fiber structure from its tip, which serves as the exit position. As described above, the optical fiber G-F can irradiate the irradiation target area with light generated by a light source L above the water surface or sunlight concentrated by a collector C above the water surface.

[0103] (2-2-8. Concentrator C) The concentrator C converges incident light. For example, the concentrator C converges sunlight incident from above and emits it from below.

[0104] (2-3. Specific Examples of Irradiation Methods of Irradiation Device 10) Specific examples of irradiation methods according to the embodiment will be described with reference to Figures 10 to 15. Specific examples 1 to 6 of the irradiation methods will be described below.

[0105] (2-3-1. Specific Example 1 of Illumination Method) As specific example 1 of the illumination method, an illumination method in which a single light source L is used to illuminate a water area including multiple aquaculture bases will be described with reference to Fig. 10. Fig. 10 is a diagram showing specific example 1 of the illumination method according to the embodiment.

[0106] 10 , the illumination device 10 illuminates light onto the marine products P-2 and P-3, which are a plurality of aquaculture bases, via a single light source L. Here, the illumination device 10 may be configured to move the light source L along a rope to which the marine products P-2 and P-3 are attached using a reel, and to illuminate the light via the light source L after moving the light source L to the depth of the illumination target area. Furthermore, the illumination device 10 may be configured to illuminate light via a light source L that corresponds to the depth of the illumination target area, out of a plurality of light sources L fixed to a rope or a net.

[0107] (2-3-2. Specific Example 2 of Illumination Method) As a specific example 2 of the illumination method, an illumination method in which light is irradiated onto each of a water area including a plurality of aquaculture bases using a plurality of light sources L will be described with reference to Fig. 11. Fig. 11 is a diagram showing a specific example 2 of the illumination method according to the embodiment.

[0108] 11 , the illumination device 10 illuminates the marine product P-2 with light via the light source L-1 and illuminates the marine product P-3 with light via the light source L-2. Here, the illumination device 10 may be configured to move the light source L-1 and the light source L-2 along the rope to which the marine product P-2 and the marine product P-3 are attached using a reel, and then illuminate the light via the light source L-1 and the light source L-2 after moving the light source L-1 and the light source L-2 to the depth of the illumination target area. Furthermore, the illumination device 10 may be configured to illuminate the light via the light source L-1 and the light source L-2 that correspond to the depth of the illumination target area, out of multiple light sources L fixed to the rope or net.

[0109] (2-3-3. Specific Example 3 of Illumination Method) Referring to Figure 12, a specific example 3 of the illumination method will be described, which is an illumination method in which light is irradiated onto a water area including an aquaculture base using a light guide tube G-P in a light guide path G that guides light emitted by a light source L. Figure 12 is a diagram showing specific example 3 of the illumination method according to the embodiment.

[0110] 12, the illumination device 10 illuminates light onto the marine products P-2 and P-3 via a light source L and a light guide tube G-P. Here, the illumination device 10 illuminates light onto each of the marine products P-2 and P-3 by making light generated by the light source L on the water surface incident on the incident position of the light guide tube G-P, guiding the light through the light guide tube G-P installed along the rope to which the marine products P-2 and P-3 are attached, and scattering the light through a slit installed at an exit position at the depth of the illumination target area.

[0111] (2-3-4. Specific Example 4 of Illumination Method) Referring to Figure 13, a specific example 4 of the illumination method will be described, which is an illumination method in which light is irradiated onto a water area including an aquaculture base using an optical fiber G-F in a light guide path G that guides light emitted by a light source L. Figure 13 is a diagram showing a specific example 4 of the illumination method according to the embodiment.

[0112] 13, the illumination device 10 illuminates light onto the marine products P-2 and P-3 via the light source L and the optical fiber G-F. Here, the illumination device 10 illuminates light onto the marine products P-2 and P-3 by making light generated by the light source L on the water surface incident on the optical fiber G-F at an incident position, guiding the light through the optical fiber G-F installed along the rope to which the marine products P-2 and P-3 are attached, and emitting the light from the tip of the optical fiber G-F at an exit position at the depth of the illumination target area.

[0113] (2-3-5. Specific Example 5 of Illumination Method) As specific example 1 of the illumination method, an illumination method in which light is irradiated onto a water area including an aquaculture base using a light guide tube G-P of a light guide path G that guides concentrated sunlight will be described using Fig. 14. Fig. 14 is a diagram showing specific example 5 of the illumination method according to the embodiment.

[0114] 14, the illumination device 10 illuminates light onto the marine products P-2 and P-3 via a collector C and a light guide tube G-P. Here, the illumination device 10 illuminates the marine products P-2 and P-3 with light by making sunlight collected by the collector C on the water surface incident on the incident position of the light guide tube G-P, guiding the light through the light guide tube G-P installed along the rope to which the marine products P-2 and P-3 are attached, and scattering the light through a slit installed at an exit position at the depth of the illumination target area.

[0115] (2-3-6. Specific Example 6 of Irradiation Method) Referring to Figure 15, an irradiation method will be described in which light is irradiated onto a water area including an aquaculture base using optical fiber G-F in a light guide path G that guides concentrated sunlight, as specific example 6 of the irradiation method. Figure 15 is a diagram showing specific example 6 of the irradiation method according to the embodiment.

[0116] 15, the illumination device 10 illuminates light onto the marine product P-2 and the marine product P-3 via the concentrator C and the optical fiber G-F. Here, the illumination device 10 causes sunlight concentrated by the concentrator C on the water surface to be incident on the incident position of the optical fiber G-F, guides the light through the optical fiber G-F installed along the rope to which the marine product P-2 and the marine product P-3 are attached, and emits the light from the tip portion of the optical fiber G-F at the exit position at the depth of the irradiation target area, thereby irradiating the marine product P-2 and the marine product P-3 with light.

[0117] (2-4. Configuration Example and Processing Example of Measuring Device 20) A configuration example and processing example of measuring device 20 will be described again with reference to Figure 2. For example, measuring device 20 is realized by a chlorophyll concentration meter, and includes a measuring unit 21, a communication unit 22, and a sensor S.

[0118] (2-4-1. Measurement unit 21) The measurement unit 21 measures the chlorophyll concentration as the amount of phytoplankton in the water area where the marine product P is cultivated. For example, the measurement unit 21 measures, as measurement data, the distribution of chlorophyll concentration in the vertical direction in the water area where the marine product P is cultivated. The measurement unit 21 can also acquire, as measurement data, the distribution of chlorophyll concentration in the horizontal direction where the marine product P is cultivated.

[0119] The measurement unit 21 transmits the measurement data to the irradiation device 10. For example, the measurement unit 21 measures, as the measurement data, the distribution of chlorophyll concentration in the vertical or horizontal direction in the water area where the marine product P is cultivated. The measurement unit 21 also receives instruction data from the irradiation device 10. For example, the measurement unit 21 receives, as the instruction data, an instruction to measure the distribution of chlorophyll concentration in the vertical or horizontal direction in the water area where the marine product P is cultivated.

[0120] (2-4-2. Communication Unit 22) The communication unit 22 controls data communication with other devices. For example, the communication unit 22 performs data communication with each communication device via a router or the like. The communication unit 22 can also perform data communication with a terminal (not shown).

[0121] (2-4-3. Sensor S) The sensor S detects the chlorophyll concentration. For example, the sensor S is realized by a concentration sensor connected to the measuring device 20 by a reel, and detects the chlorophyll concentration based on the signal output by the measuring unit 21.

[0122] (2-5. Configuration Example and Processing Example of Supply Device 30) A configuration example and processing example of supply device 30 will be described with reference to Fig. 2 again. For example, supply device 30 has a supply unit 31, a communication unit 22, and a storage container F.

[0123] (2-5-1. Supplying Unit 31) The supplying unit 31 supplies nutrients that increase phytoplankton. For example, the measuring unit 21 supplies the nutrients that increase phytoplankton to a supply target area identified based on the chlorophyll concentration in the water area where the aquatic products are cultivated via a storage container F that stores the nutrients.

[0124] The supply unit 31 replenishes nutrients that increase phytoplankton. For example, the supply unit 31 replenishes nutrients that increase phytoplankton to the storage container F that stores nutrients.

[0125] The supply unit 31 transmits supply data to the irradiation device 10. For example, the measurement unit 21 transmits, as supply data, the balance history of nutrients stored in the storage container F to the irradiation device 10. The supply unit 31 also receives instruction data from the irradiation device 10. For example, the supply unit 31 receives, as instruction data, an instruction to supply, to a supply target area, nutrients that increase phytoplankton in the water area where the marine product P is cultivated. The supply unit 31 also receives, as instruction data, an instruction to replenish the storage container F with nutrients that increase phytoplankton.

[0126] (2-5-2. Communication Unit 32) The communication unit 32 controls data communication with other devices. For example, the communication unit 32 performs data communication with each communication device via a router or the like. The communication unit 32 can also perform data communication with a terminal (not shown).

[0127] (2-5-3. Storage Container F) The storage container F stores fertilizer containing nutrients that increase phytoplankton in the waters where the aquatic product P is cultivated. For example, the storage container F may be a bag-shaped, cylindrical, spherical, cubic, or other container made of a material such as resin, wood, or metal, and has a structure that can be opened and closed to allow the stored fertilizer to elute based on a signal output by the supply unit 31. The storage container F also stores fertilizer containing at least one of a nitrogen component and a phosphate component as the nutrient component. For example, the storage container F stores fertilizer containing ammonium sulfate, ammonium chloride, ammonium nitrate, sodium nitrate, potassium nitrate, urea, calcium superphosphate, calcium hydrogen phosphate, ash, sodium phosphate, potassium phosphate, potassium polyphosphate, phytic acid, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, or the like as the nutrient component.

[0128] 16 to 20, the process flow of the aquaculture system 100 according to the embodiment will be described. Below, the process flow of the aquaculture system 100 as a whole will be described, and then each process, namely, the measurement management process, the identification management process, the irradiation management process, and the supply management process, will be described.

[0129] (3-1. Overall processing of the aquaculture system 100) The overall processing flow of the aquaculture system 100 according to the embodiment will be described with reference to Figure 16. Figure 16 is a flowchart showing an example of the overall processing flow of the aquaculture system 100 according to the embodiment. Note that the processing of steps S101 to S104 below may be performed in a different order. Furthermore, some of the processing of steps S101 to S104 below may be omitted.

[0130] (3-1-1. Measurement Management Process) First, the aquaculture system 100 executes a measurement management process (step S101). For example, the aquaculture system 100 executes steps S201 to S204 described below to measure the vertical distribution of chlorophyll concentration, which indicates the amount of phytoplankton, in the aquaculture farm where the aquatic product P is cultivated.

[0131] (3-1-2. Identification Management Process) Second, the aquaculture system 100 executes the identification management process (step S102). For example, the aquaculture system 100 executes the processes of steps S301 to S305 described below to identify, as the irradiation target area, a farming base that receives a low amount of sunlight irradiation and has a low amount of phytoplankton necessary for the growth of the aquatic products P.

[0132] (3-1-3. Irradiation Management Process) Third, the aquaculture system 100 executes an irradiation management process (step S103). For example, the aquaculture system 100 executes steps S401 to S404 described below to irradiate light via the light source L, the light collector C, and the light guide G to an aquaculture base where the amount of phytoplankton necessary for the growth of the aquatic products P is small.

[0133] (3-1-4. Supply Management Process) Fourth, the aquaculture system 100 executes a supply management process (step S104). For example, the aquaculture system 100 executes steps S501 to S506 described below to supply nutrients to an aquaculture base that receives a high amount of sunlight and has a large amount of phytoplankton but has a low amount of nutrients.

[0134] (3-2. Measurement management process) The flow of the measurement management process of the aquaculture system 100 according to the embodiment will be described with reference to Figure 17. Figure 17 is a flowchart showing an example of the flow of the measurement management process of the aquaculture system 100 according to the embodiment. Note that the processes of steps S201 to S204 below may be executed in a different order. Furthermore, some of the processes of steps S201 to S204 below may be omitted.

[0135] (3-2-1. Measurement Instruction Process) First, the irradiation device 10 executes the measurement instruction process (step S201). For example, the irradiation device 10 instructs the measurement device 20 to measure the vertical distribution of chlorophyll concentration in the aquaculture farm where the aquatic product P is cultivated.

[0136] (3-2-2. Measurement Execution Process) Second, the measurement device 20 executes a measurement execution process (step S202). For example, the measurement device 20 executes measurement of the vertical distribution of chlorophyll concentration in response to an instruction from the irradiation device 10.

[0137] (3-2-3. Measurement Data Acquisition Process) Third, the irradiation device 10 executes measurement data acquisition process (step S203). For example, the irradiation device 10 acquires the vertical distribution of chlorophyll concentration from the measurement device 20 as measurement data.

[0138] (3-2-4. Measurement Data Storage Process) Fourth, the irradiation device 10 executes a measurement data storage process (step S204). For example, the irradiation device 10 stores the vertical distribution of chlorophyll concentration acquired from the measurement device 20 in the measurement data storage unit 14a.

[0139] (3-3. Specific management processing) The flow of the specific management processing of the aquaculture system 100 according to the embodiment will be described with reference to Figure 18. Figure 18 is a flowchart showing an example of the flow of the specific management processing of the aquaculture system 100 according to the embodiment. Note that the processing of the following steps S301 to S305 can also be performed in a different order. Furthermore, some of the processing of the following steps S301 to S305 may be omitted.

[0140] (3-3-1. Measurement Data Reference Process) First, the irradiation device 10 executes measurement data reference process (step S301). For example, the irradiation device 10 refers to the vertical distribution of chlorophyll concentration stored in the measurement data storage unit 14a as measurement data.

[0141] (3-3-2. Irradiation Target Area Identification Process) Second, the irradiation device 10 executes irradiation target area identification process (step S302). For example, the irradiation device 10 identifies the aquaculture base below the maximum layer as the irradiation target area based on the referenced vertical distribution of chlorophyll concentration.

[0142] (3-3-3. Irradiation Method Identification Process) Third, the illumination device 10 executes an illumination method identification process (step S303). For example, the illumination device 10 identifies an illumination method defined by illumination conditions for irradiating the illumination target area with light.

[0143] (3-3-4. Supply Target Area Identification Processing) Fourth, the irradiation device 10 executes a supply target area identification processing (step S304). For example, the irradiation device 10 identifies the aquaculture base above the maximum layer as the supply target area based on the vertical distribution of chlorophyll concentration in the aquaculture farm where the referenced aquatic product P is cultivated.

[0144] (3-3-5. Identification Result Storing Process) Fifth, the irradiation device 10 executes identification result storing process (step S305). For example, the irradiation device 10 stores the identified irradiation target area, irradiation method, and supply target area in the identification result storage unit 14b as the identification results.

[0145] (3-4. Irradiation Management Processing) The flow of the irradiation management processing of the aquaculture system 100 according to the embodiment will be described with reference to Figure 19. Figure 19 is a flowchart showing an example of the flow of the irradiation management processing of the aquaculture system 100 according to the embodiment. Note that the processing of steps S401 to S404 below may be performed in a different order. Furthermore, some of the processing of steps S401 to S404 below may be omitted.

[0146] (3-4-1. Irradiation Target Area Referencing Process) First, the irradiation device 10 executes irradiation target area referencing process (step S401). For example, the irradiation device 10 refers to the irradiation target area stored in the identification result storage unit 14b.

[0147] (3-4-2. Irradiation Method Reference Process) Second, the irradiation device 10 executes an irradiation method reference process (step S402). For example, the irradiation device 10 refers to the irradiation methods stored in the identification result storage unit 14b.

[0148] (3-4-3. Irradiation Execution Process) Third, the irradiation device 10 executes the irradiation execution process (step S403). For example, the irradiation device 10 irradiates the referenced irradiation target area with light in the referenced irradiation method.

[0149] (3-4-4. Irradiation Result Storage Process) Fourth, the irradiation device 10 executes irradiation result storage process (step S404). For example, the irradiation device 10 stores the irradiation result including the irradiation method, the irradiation target area, and the irradiation time in the irradiation result storage unit 14c.

[0150] (3-5. Supply Management Processing) The flow of the supply management processing of the aquaculture system 100 according to the embodiment will be described with reference to Figure 20. Figure 20 is a flowchart showing an example of the flow of the supply management processing of the aquaculture system 100 according to the embodiment. Note that the processing of steps S501 to S506 below may be performed in a different order. Furthermore, some of the processing of steps S501 to S506 below may be omitted.

[0151] (3-5-1. Supply Target Area Referencing Process) First, the irradiation device 10 executes supply target area referencing process (step S501). For example, the irradiation device 10 refers to the supply target area stored in the identification result storage unit 14b.

[0152] (3-5-2. Supply Data Reference Process) Second, the irradiation device 10 executes supply data reference process (step S502). For example, the irradiation device 10 refers to the supply data stored in the supply data storage unit 14d.

[0153] (3-5-3. Supply instruction process) Third, the irradiation device 10 executes the supply instruction process (step S503). For example, when a sufficient amount of nutritional components remains in the storage container F of the supply device 30 based on the referenced supply data, the irradiation device 10 instructs the supply device 30 to supply the nutritional components to the referenced supply target area.

[0154] (3-5-4. Supply Execution Process) Fourth, the supply device 30 executes a supply execution process (step S504). For example, the supply device 30 executes the supply of nutritional components to the supply target area in response to an instruction from the irradiation device 10.

[0155] (3-5-5. Supply Data Acquisition Process) Fifth, the irradiation device 10 executes supply data acquisition process (step S505). For example, the irradiation device 10 acquires, as supply data, the supply amount of nutritional components to the supply target area from the supply device 30.

[0156] (3-5-6. Supply Data Storage Processing) Sixth, the irradiation device 10 executes supply data storage processing (step S506). For example, the irradiation device 10 stores the supply amount of nutritional components to the supply target area acquired from the supply device 30 in the supply data storage unit 14d.

[0157] 4. Effects of the embodiment Finally, effects of the embodiment will be described below. Effects 1 to 8 corresponding to the processing according to the embodiment will be described below.

[0158] (4-1. Effect 1) First, in the process according to the above-described embodiment, the illumination device 10 illuminates light onto an illumination target area that is specified based on the amount of phytoplankton in the water area where the marine product P is cultivated. Therefore, this process can promote the growth of the marine product P in a specific aquaculture base.

[0159] (4-2. Effect 2) Second, in the process according to the embodiment described above, the irradiation device 10 acquires the vertical distribution of chlorophyll concentration in the water area where the marine product P is cultivated, and uses the acquired vertical distribution of chlorophyll concentration to identify, as the irradiation target area, a water area including the aquaculture base vertically below the water area where the chlorophyll concentration shows a maximum value. Therefore, in this process, by increasing phytoplankton in the water area that receives less sunlight irradiation, it is possible to promote the growth of the marine product P in the specific aquaculture base.

[0160] (4-3. Effect 3) Third, in the process according to the embodiment described above, the illumination device 10 illuminates a water area including multiple aquaculture bases with light using a single light source L. Therefore, in this process, a small number of light sources L are used to efficiently illuminate multiple aquaculture bases with light, thereby increasing phytoplankton in water areas that receive less sunlight, thereby promoting the growth of marine products P in specific aquaculture bases.

[0161] (4-4. Effect 4) Fourth, in the process according to the embodiment described above, the illumination device 10 illuminates each of the water areas including the multiple aquaculture bases with light using the multiple light sources L. Therefore, in this process, the multiple light sources L are used to accurately illuminate the multiple aquaculture bases with light, and by increasing phytoplankton in the water areas that receive less sunlight, it is possible to promote the growth of marine products P in the specific aquaculture base.

[0162] (4-5. Effect 5) Fifth, in the process according to the embodiment described above, the illumination device 10 illuminates the water area including the aquaculture base with light using the light guide path G that guides the light generated by the light source L. Therefore, in this process, the light source L and the light guide path G are used to illuminate the aquaculture base with light regardless of the weather or time of day, thereby increasing the number of phytoplankton in the water area that receives little sunlight, thereby promoting the growth of marine products P in the specific aquaculture base.

[0163] (4-6. Effect 6) Sixth, in the process according to the embodiment described above, the illumination device 10 illuminates the water area including the aquaculture base with light using the light guide G that guides concentrated sunlight. Therefore, in this process, the concentrator C and the light guide G are used to illuminate the aquaculture base with sunlight without using the light source L, thereby increasing the number of phytoplankton in the water area that receives little sunlight, thereby promoting the growth of marine products P in the specific aquaculture base.

[0164] (4-7. Effect 7) Seventh, in the process according to the above-described embodiment, the irradiation device 10 instructs the supply of nutrients that increase phytoplankton to a target supply area identified based on the chlorophyll concentration in the water area where the marine product P is cultivated. Therefore, in this process, by increasing phytoplankton in a water area that receives a high amount of sunlight but has low nutrients, it is possible to promote the growth of the marine product P in a specific aquaculture base.

[0165] (4-8. Effect 8) Eighth, in the process according to the embodiment described above, the marine product P is a shellfish cultivated in a suspended-type farm. Therefore, this process can promote the growth of oysters, scallops, pearl oysters, etc. at a specific farming base.

[0166] [5. System] Information including processing procedures, control procedures, specific names, various data and parameters shown in the above documents and drawings may be changed as desired unless otherwise specified.

[0167] Furthermore, the components of each device shown in the figure are conceptual functional components and do not necessarily have to be physically configured as shown. In other words, the specific form of distribution and integration of each device is not limited to that shown. In other words, all or part of the devices can be functionally or physically distributed or integrated in any unit depending on various loads, usage conditions, etc.

[0168] Furthermore, all or any part of the processing functions performed by each device may be realized by a CPU and a program analyzed and executed by the CPU, or may be realized as hardware using wired logic.

[0169] [6. Hardware] Next, a hardware configuration example of the irradiation device 10 will be described. Note that other devices may also have a similar hardware configuration. FIG. 21 is a diagram showing a hardware configuration example according to an embodiment. As shown in FIG. 21, the irradiation device 10 has a communication device 10a, a HDD (Hard Disk Drive) 10b, a memory 10c, and a processor 10d. In addition, each unit shown in FIG. 21 is connected to each other by a bus or the like.

[0170] The communication device 10a is a network interface card or the like, and communicates with other servers. The HDD 10b stores programs and databases that operate the functions shown in FIG.

[0171] The processor 10d reads out a program that executes the same processes as the respective processing units shown in FIG. 2 from the HDD 10b or the like and loads it into the memory 10c, thereby operating a process that executes each function described in FIG. 2 or the like. For example, this process executes the same functions as the respective processing units of the irradiation device 10. Specifically, the processor 10d reads out a program that has the same functions as the acquisition unit 15a, the identification unit 15b, the irradiation unit 15c, the instruction unit 15d, etc. from the HDD 10b or the like. Then, the processor 10d executes a process that executes the same processes as the acquisition unit 15a, the identification unit 15b, the irradiation unit 15c, the instruction unit 15d, etc.

[0172] In this way, the irradiation device 10 operates as a device that executes various processing methods by reading and executing a program. The irradiation device 10 can also realize functions similar to those of the above-described embodiment by reading the program from a recording medium using a medium reading device and executing the read program. Note that the program in this other embodiment is not limited to being executed by the irradiation device 10. For example, the present invention can also be applied in the same way to cases where another computer or server executes a program, or where these execute a program in cooperation with each other.

[0173] This program can be distributed via a network such as the Internet. In addition, this program can be recorded on a computer-readable recording medium such as a hard disk, a flexible disk (FD), a CD-ROM, a magneto-optical disk (MO), or a digital versatile disk (DVD), and can be read out from the recording medium and executed by a computer.

[0174] [7. Others] Some examples of combinations of the disclosed technical features are described below.

[0175] (1) An irradiation device including an irradiation unit that irradiates light onto an irradiation target area identified based on the amount of phytoplankton in the water area where aquatic products are cultivated.

[0176] (2) The illumination device described in (1) further includes an acquisition unit that acquires a distribution of chlorophyll concentration that indicates the amount of phytoplankton in the vertical direction of the water body, and an identification unit that uses the acquired distribution of chlorophyll concentration to identify the water body including an aquaculture base vertically below the water body where the chlorophyll concentration shows a maximum value as the illumination target area.

[0177] (3) An illumination device according to (1) or (2), wherein the illumination unit uses a single light source to illuminate the water area including multiple aquaculture bases.

[0178] (4) An illumination device described in any one of (1) to (3), wherein the illumination unit uses multiple light sources to illuminate each of the water areas including multiple aquaculture bases with light.

[0179] (5) An illumination device described in any one of (1) to (4), wherein the illumination unit illuminates the water area including the aquaculture base with light using a light guide path that guides light generated by a light source.

[0180] (6) An illumination device described in any one of (1) to (5), wherein the illumination unit illuminates the water area including the aquaculture base with light using a light guide path that guides concentrated sunlight.

[0181] (7) An irradiation device according to any one of (1) to (6), further comprising an instruction unit that instructs the supply of nutrients that increase phytoplankton to a supply target area identified based on the chlorophyll concentration in the water area where the aquatic products are cultivated.

[0182] (8) The irradiation device described in any one of (1) to (7), wherein the marine product is a shellfish cultivated in a suspended type aquaculture farm.

[0183] (9) An illumination method in which a computer executes processing to illuminate an illumination target area identified based on the amount of phytoplankton in the water area where aquatic products are cultivated.

[0184] (10) An irradiation program that causes a computer to execute a process of irradiating light onto an irradiation target area identified based on the amount of phytoplankton in the water area where the aquatic products are cultivated.

[0185] REFERENCE SIGNS LIST 10 Irradiation device 10a Communication device 10b HDD 10c Memory 10d Processor 11 Input unit 12 Output unit 13 Communication unit 14 Storage unit 14a Measurement data storage unit 14b Identification result storage unit 14c Irradiation result storage unit 14d Supply data storage unit 15 Control unit 15a Acquisition unit 15b Identification unit 15c Irradiation unit 15d Instruction unit 20 Measurement device 21 Measurement unit 22 Communication unit 30 Supply device 31 Supply unit 32 Communication unit 100 Aquaculture system

Claims

1. An irradiation device comprising an irradiation unit that irradiates light onto an irradiation target area that is specified based on the amount of phytoplankton in the water area where aquatic products are cultivated.

2. The illumination device according to claim 1, further comprising: an acquisition unit that acquires a distribution of chlorophyll concentration that indicates the amount of phytoplankton in the vertical direction of the water body; and an identification unit that uses the acquired distribution of chlorophyll concentration to identify the water body including an aquaculture base vertically below the water body where the chlorophyll concentration shows a maximum value as the illumination target area.

3. The illumination device according to claim 1, wherein the illumination unit uses a single light source to illuminate the water area including multiple aquaculture bases.

4. The illumination device according to claim 1, wherein the illumination unit uses a plurality of light sources to illuminate each of the water areas including a plurality of aquaculture bases with light.

5. The illumination device according to claim 1, wherein the illumination unit illuminates the water area including the aquaculture base with light using a light guide path that guides light generated by the light source.

6. The illumination device according to claim 1, wherein the illumination unit illuminates the water area including the aquaculture base with light using a light guide path that guides concentrated sunlight.

7. The irradiation device according to claim 1, further comprising an instruction unit that instructs the supply of nutrients that increase phytoplankton to a supply target area identified based on the chlorophyll concentration in the water area where the aquatic products are cultivated.

8. The irradiation device according to any one of claims 1 to 7, wherein the marine products are shellfish cultivated in a suspended type farm.

9. An illumination method in which a computer performs processing to illuminate an illumination target area identified based on the amount of phytoplankton in a water area where aquatic products are cultivated.

10. An irradiation program that causes a computer to execute a process of irradiating light onto an irradiation target area that is identified based on the amount of phytoplankton in the water area where the aquatic products are cultivated.